Document device group implementation requirements

Add missing desktop voice compressor controls
Accept zero compressor gain and clarify Android storage limits
2026-11-02 16:17:03 +01:00 · 2026-11-02 16:17:03 +01:00 · 2026-11-02 16:17:03 +01:00 · 2026-11-02 15:03:46 +01:00 · 2026-11-02 15:03:45 +01:00 · 2026-11-02 00:33:55 +01:00
2425 changed files with 625390 additions and 53713 deletions
@@ -2,7 +2,10 @@
 /build/
 build-win/
 tools/chatgui/build/
+tools/chatgui/rlottie_build/
 tools/chatgui/ffmpeg/ffmpeg_build/
+tools/chatgui/qt_multimedia/build/
+tools/lightsout/build/

 # Build outputs
 *.o
@@ -11,6 +14,8 @@ tools/chatgui/ffmpeg/ffmpeg_build/
 *.a
 *.so
 *.so.*
+# Prebuilt native runtime для Android VAD (onnxruntime) — коммитим несмотря на *.so
+!tools/chatgui-android/app/src/main/jniLibs/*/libonnxruntime.so
 /utun
 /src/utun
 test_serialize
@@ -28,6 +33,7 @@ index.html
 *.exe

 # Autotools
+/.utun-build-state*
 Makefile
 !tools/etcpmon/Makefile
 Makefile.in
@@ -72,6 +78,8 @@ callgrind.out.*
 tests/*.log
 tests/*.trs
 tests/logs/
+/db_a/
+/db_b/

 # Mass update logs
 logs/
@@ -80,6 +88,7 @@ logs/
 tests/test_*
 !tests/test_*.c
 !tests/test_*.h
+!tests/test_*.py
 !tests/test_*.conf
 !tests/test_*.json
 tests/bench_*
@@ -108,6 +117,7 @@ tools/proxy/udp_proxy

 # Reference projects (not part of utun)
 tools/tdesktop-dev/
+/hardware/

 # Debug/temp artifacts
 *.bak
@@ -32,12 +32,17 @@ This file contains essential information for AI coding agents working in the uTu

 Доствп на узел colo2: ssh -p44322 logs@colo2

+Структура .h файлов:
+- в начале краткое и понятное описание: что делает модуль, как пользоваться.
+- поля структур также кратко описываем - что, для его, если есть нюансы/значения
+- для функций: описываем назначение, как пользоваться, описание аргументов, возврата. кратко но понятно.
+
 ## Quick Reference

-**Repository:** uTun - Secure VPN tunnel with ETCP protocol
+**Repository:** uTun — общее сетевое ядро ETCP, независимо запускаемые UTUN и P2P-чат
 **Language:** C (C99)
 **Build System:** GNU Autotools (autoconf/automake)
-**Cryptography:** OpenSSL (AES-CCM, X25519, SHA256)
+**Cryptography:** OpenSSL (AES-CCM, X25519, Ed25519, SHA256)

 ## Build Commands

@@ -51,9 +56,19 @@ This file contains essential information for AI coding agents working in the uTu
 powershell build_full.bat       # запускает bash build.sh --full через MSYS2 UCRT64
 ```

+### Build (FreeBSD)
+```sh
+# Первичная установка инструментов от root:
+pkg install -y bash gmake autoconf automake libtool pkgconf openssl python3
+./build.sh -j4                 # общий скрипт; автоматически выбирает gmake и Clang
+./build_bsd_full.sh -j4        # полная сборка через общий скрипт
+```
+Python 3 нужен для проверок скрипта сборки. SHA-256 берётся из базовой системы FreeBSD.
+
 ### Incremental Build
 ```bash
-./build.sh -j4                 # make с авто-конфигурацией если надо
+./build.sh -j4                 # инкрементальная сборка, конфигурация и очистка при необходимости
+./build.sh --no-gui -j4        # только ядро и тесты, без отдельной сборки GUI
 ```
 ```powershell
 powershell -Command ".\build.bat" 2>&1   # Windows, логи: build_win.log
@@ -68,9 +83,10 @@ make distclean                 # Clean everything including configure files

 ### Partial Builds
 ```bash
-cd lib && make                 # Build only the library (libuasync.a)
-cd src && make                 # Build only the main program
-cd tests && make               # Build only tests
+make -C lib                    # базовые библиотеки
+make -C lib/libopus            # встроенный Opus
+make -C src                    # основной бинарник src/utun (библиотеки уже должны быть собраны)
+make -C tests                  # тесты (используют объекты src/)
 ```

 ### Direct Build (Windows, без autotools)
@@ -86,7 +102,7 @@ python3 tools/chatcli members <ch_id>              # мемберы с полн
 python3 tools/chatcli messages <ch_id> [count]     # последние сообщения
 python3 tools/chatcli send <ch_id> "text"          # отправить сообщение
 python3 tools/chatcli invite <ch_id>               # создать invite-ссылку
-python3 tools/chatcli connect <utun://...>         # join по ссылке
+python3 tools/chatcli connect 'utun://...'         # join по ссылке
 python3 tools/chatcli create "Name"                # создать канал
 python3 tools/chatcli listen                       # слушать события (Ctrl+C выход)
 ```
@@ -94,13 +110,14 @@ python3 tools/chatcli listen                       # слушать событи

 ### ASAN Build (AddressSanitizer, Linux)
 ```bash
-./build.sh --asan -j4           # lib/ + src/ only (tests not ASAN-compatible)
+./build.sh --asan -j4           # собирает lib/ + src/; тесты этот режим скрипта пропускает
 ```
 Запуск с ASAN (detect_leaks отключены чтобы не спамить при shutdown):
 ```bash
-ASAN_OPTIONS=detect_leaks=0:halt_on_error=0 ./src/utun -f -p /tmp/utun.pid -l /tmp/utun.log
+ASAN_OPTIONS=detect_leaks=0:halt_on_error=0:log_path=/tmp/utun_asan ./src/utun -f -p /tmp/utun.pid -l /tmp/utun.log
 ```
-Краш-логи ASAN пишутся в `/tmp/utun_asan.<pid>`.
+В этом примере отчёты ASAN пишутся в `/tmp/utun_asan.<pid>` благодаря `log_path`.
+Для отдельного теста нужно собирать его зависимости с теми же sanitizer-флагами; обычные и ASAN-объекты не смешивать.

 ## Test Commands

@@ -118,13 +135,14 @@ cd tests/
 ./test_etcp_two_instances
 ```

-### Run Single Test with Debug Info
+### Build and Run a Single Test
 ```bash
-cd tests/
-gcc -I../src -I../lib -I../tinycrypt/lib/include \
-    -o my_test test_file.c ../src/*.c ../lib/*.c ../tinycrypt/lib/source/*.c
-./my_test
+make -C tests test_services
+cd tests && ./test_services
 ```
+Использовать цель из `tests/Makefile.am`: ручная компиляция `src/*.c` пропускает подкаталоги и добавляет лишний `main`.
+Уровни и категории диагностики настраиваются в самом тесте через `debug_set_level` / `debug_set_category_level`.
+Проверки самого скрипта сборки запускаются отдельно: `make -C tests check-build-script` (нужен Python 3); в `./check.sh` они не входят.

 ## Code Style Guidelines

@@ -137,7 +155,7 @@ gcc -I../src -I../lib -I../tinycrypt/lib/include \

 ### Formatting
 - **Indentation:** 4 spaces, no tabs
- **Braces:** Same line for functions, new line for control structures:
+- **Braces:** Открывающая скобка на строке функции или условия:
  ```c
  int function(void) {
      if (condition) {
@@ -145,7 +163,7 @@ gcc -I../src -I../lib -I../tinycrypt/lib/include \
      }
  }
  ```
- **Comments:** Primary language is Russian for business logic, English for API docs
+- **Comments:** Краткие описания на русском; сохранять принятые имена API и протокольных полей.
 - **Line Length:** Aim for 80-100 characters, but can go up to 150 if logically coherent

 ### Include Order
@@ -201,7 +219,7 @@ sc_context_t ctx;
 sc_init_ctx(&ctx, &my_keys);

 // 2. Set peer public key (for key exchange)
-sc_set_peer_public_key(&ctx, peer_public_key, SC_PEER_PUBKEY_HEX); // 0=bin, 1=hex
+sc_set_peer_public_key(&ctx, peer_public_key_bin, SC_PEER_PUBKEY_BIN); // 32 бинарных байта; HEX — для hex-строки

 // 3. Ready for encrypt/decrypt
 sc_encrypt(&ctx, plaintext, plaintext_len, ciphertext, &ciphertext_len);
@@ -227,69 +245,107 @@ debug - отладка: всё что нужно для понимание су
 info - сообщения для пользователя о работе. мы должны видеть в читаемом виде понятные и осмысленные сообщения о каких-либо значимых действиях с точки зрения логики работы модуля или приложения
 warn / error - ошибки и предупреждения (аномалии). должны быть во всех ошибочных ветках. Молча вываливаться с ошибкой нельзя, все ошибки и предупреждения должны логироваться.

-### Debug Categories (28 категорий)
-```
-NONE=0, UASYNC=1, LL_QUEUE=2, CONNECTION=3, ETCP=4, CRYPTO=5, MEMORY=6,
-TIMING=7, CONFIG=8, TUN=9, ROUTING=10, TIMERS=11, NORMALIZER=12, BGP=13,
-SOCKET=14, CONTROL=15, DUMP=16, TRAFFIC=17, DEBUG=18, GENERAL=19, NAT=20,
-KEEPALIVE=21, ETCPROUTE=22, BBR=23, ETCP_DUMP=24, CONNECTIVITY=25, DB_SYNC=26,
-MEMBER_SYNC=27
-```
+### Debug Categories
+Актуальные имена и константы — в `lib/debug_config.h`, текстовые имена — в `lib/debug_config.c`.
+Основные: `sys`, `connection`, `etcp`, `crypto`, `config`, `tun`, `routing`, `timers`, `bgp`,
+`socket`, `control`, `dump`, `traffic`, `debug`, `general`, `nat`, `keepalive`, `etcp_route`,
+`media`, `etcp_dump`, `chat`, `chat_sync`, `member_sync`, `proxy`, `video`, `reality`, `dm`, `call`, `radio`, `vad`, `aec`.
+UASYNC/LL_QUEUE/MEMORY/TIMING объединены в SYS, NORMALIZER/BBR — в ETCP; старые числовые списки не использовать.

 ### Настройка отладки
- В конфиге: `debug = etcp=trace,config=info` (формат: `категория=уровень,...`)
+- В INI-конфиге: секция `[debug]`, каждая категория отдельной строкой (`etcp=trace`, `config=info`).
+- Строку `etcp=trace,config=info` принимает `debug_parse_config()`; GUI хранит её в `[gui] debug_categories`.
 - В коде: глобальный уровень и per-category уровни из `debug_config_t g_debug_config`
 - Макросы: `DEBUG_ERROR(cat,fmt,...)` `DEBUG_WARN` `DEBUG_INFO` `DEBUG_DEBUG` `DEBUG_TRACE`
- `log_dump(prefix, data, len)` — hex dump в лог
+- `log_dump(level, category, prefix, data, len)` — hex dump в лог

 ### Dual Output
- Консоль и файл настраиваются раздельно (`debug_set_console_level`, `debug_set_file_level`)
+- Фильтр уровней общий для выходов; `debug_enable_console()` включает/выключает консоль.
 - `debug_enable_file_output(path, truncate)` / `debug_disable_file_output()`

 ## Architecture

+### Ядро, сервисы и владение ресурсами
+
+- `utun_instance_create*()` создаёт ядро; `utun_core_start()` запускает общие сетевые службы.
+- `utun_service_start/stop()` управляет UTUN-группой, TUN/NAT и запросами к пирам из конфига.
+- `chat_service_start/stop()` управляет чатом и CHAT-группами. Чат не требует UTUN; desktop и Android запускают ядро и чат явно.
+- Ядро владеет общей SQLite (`db_path/chats.db`, без пути — `:memory:`), идентичностью, транспортом и маршрутизатором.
+  Остановка сервиса сохраняет БД и ресурсы другого сервиса. `utun_instance_destroy()` освобождает ядро, но не переданный `UASYNC`.
+- Группа владеет NCD handle с начала CONNECTING. Инициатор хранит отменяемый `TOPO_PEER_REQUEST`;
+  закрытие своего запроса не разрывает транспорт других владельцев. Готовая сессия сохраняется у группы.
+- UP означает работоспособный транспорт. READY означает завершённое согласование и обмен таблицей конкретной группы.
+  Recovery ждёт нужных маршрутов через READY-пиров; наличие `ETCP_CONN*` само по себе не гарантирует UP.
+- JOIN добавляет подписанного мембера, Merkle распространяет запись. Доступ к CHAT-группе каждый узел даёт по своей таблице участников;
+  invite-ключ не даёт временного членства. Протокол описан в `src/chat/chat_join.h`, групповое согласование — в `src/routing_layer/topo_group.h`.
+- `TOPO_NODE` — общая подписанная запись узла. Более свежий timestamp заменяет запись целиком, с полями и подписью;
+  адреса не версионируются отдельно. BGP обновляет запись и передаёт изменения NCD (см. `doc/node_snapshot.md`).
+- BGP хранит один путь к назначению от каждого соседа. WITHDRAW удаляет только путь отправителя;
+  NODEINFO с прежним timestamp также обновляет путь. Выбор: живой путь с минимумом хопов, затем меньший ID соседа.
+  REINIT сохраняет пути до проверки нового снимка; TABLE_COMPLETE удаляет неподтверждённые, зависший обмен перезапускается.
+- ETCP-router дописывает ID при транзите и отбрасывает повторное посещение для DATA/ACK/control.
+  Список переходов находится вне подписанного тела; формат описан в `src/routing_layer/etcp_router.h`.
+
+Все операции с ядром выполняются в его uasync-потоке; stop/destroy — вне callbacks останавливаемых сервисов.
+Порядок освобождения ресурсов и нюансы media workers: `doc/service_lifecycle.md`.
+
 ### Directory Structure
 ```
-├── lib/                    # Core libraries (18 .c + 20 .h + libopus/liblmdb)
+├── lib/                    # uasync, очереди, SQLite, Opus, SpeexDSP, Silero VAD, SoundTouch, LMDB
 ├── src/                    # Main source code
-│   ├── transport_layer/    #   ETCP stack, crypto, STCP, normalizer, BBR (~30 файлов)
-│   ├── routing_layer/      #   Routing, BGP, conn_mgr, etcp_router, NAT detection (~20 файлов)
-│   ├── chat/               #   P2P чат, db_sync, merkle_sync, member_sync (17 файлов)
-│   ├── proxy/              #   SOCKS5, TCP/UDP/ICMP прокси (10 файлов)
-│   ├── lwip_tcp/           #   Встроенный lwIP TCP стек (7 файлов)
-│   ├── media_delivery/     #   Доставка медиафайлов (6 файлов)
-│   ├── media_async/        #   Асинхронный движок медиа (2 файла)
-│   └── *.c/h               #   Корневые модули: utun, config, TUN, firewall, NAT, NTP, control (~14 файлов)
-├── tests/                  # ~70 тестов, 64 в check_PROGRAMS
+│   ├── transport_layer/    #   ETCP, сессии, crypto, STCP/REALITY, SOCKS-клиент, NCD, BBR
+│   ├── routing_layer/      #   Routing, группы/BGP, recovery, conn_mgr, etcp_router
+│   ├── chat/               #   P2P чат, join, db_sync, merkle_sync, member_sync
+│   ├── dm/                 #   Личные сообщения, E2E-вложения и offline-mailbox
+│   ├── call/               #   Звонки и общий голосовой стек
+│   ├── radio/              #   Групповая PTT-рация
+│   ├── stream/             #   Прямые трансляции: подписанные RS-блоки, выбор поставщиков, аудио/видео
+│   ├── member_files/       #   Файловое хранилище участников CHAT-группы и асинхронные передачи
+│   ├── local_transport/    #   Обнаружение устройств и доставка приглашений в локальной сети по UDP
+│   ├── proxy/              #   SOCKS5, TCP/UDP/ICMP прокси
+│   ├── lwip_tcp/           #   Встроенный lwIP TCP стек
+│   ├── media_delivery/     #   Блоки медиа каналов и передача неизменяемых файлов
+│   ├── media_async/        #   Фоновые задачи, метаданные вложений, подготовка голоса/видео
+│   ├── video/              #   Пробинг и транскодирование видео через FFmpeg
+│   ├── dnsmasq/            #   Архив исходников для встроенной сборки dnsmasq
+│   └── *.c/h               #   utun, instance, config, TUN, firewall, NAT, NTP, control, broadcast
+├── tests/                  # Состав тестов и цели запуска: tests/Makefile.am
 ├── doc/                    # Technical Specifications
 ├── tools/                  # Auxiliary tools
 │   ├── etcpmon/            # GUI монитор ETCP
 │   ├── chatgui/            # GUI чат (Qt 6 с Qt 5 fallback, сборка CMake)
 │   ├── chatgui-android/    # Android P2P чат (Jetpack Compose + libutun_lite)
+│   ├── logreceiver/        # Приём UDP-логов Android
+│   ├── chat_tcp_test/      # Сценарий проверки чата через TCP
+│   ├── lightsout/          # Отдельная игра Lights Out на Qt
+│   ├── lightsout-android/  # Android-версия Lights Out
 │   ├── tdesktop-dev/       # Референс: Telegram Desktop (только для изучения)
 │   ├── proxy/              # UDP прокси для тестов
-│   └── bping/              # BPing (bandwidth ping)
+│   ├── bping/              # BPing (bandwidth ping)
+│   └── chatcli             # Headless CLI; описание команд — chatcli_commands.txt
 ├── tinycrypt/              # TinyCrypt crypto library (external)
-├── net_emulator/           # Network emulator (delays, loss, reordering)
-└── c2/                     # Test instance 2 (конфиг и бинарник для тестов)
+└── net_emulator/           # Network emulator (delays, loss, reordering)
 ```

 ### File Overview

+Пути ниже относительны к каталогу секции; `name.c/h` означает пару `.c` и `.h`.
+Перечислены модули проекта; внутренние файлы сторонних библиотек сгруппированы по каталогам.
+
 **Core (src/)**
 - `utun.c` - Main program entry point, CLI parsing, daemon mode
- `utun_instance.c/h` - Root instance lifecycle, config loading, all submodule init
+- `utun_instance.c/h` - Создание ядра и независимый жизненный цикл UTUN/чата, владение общими ресурсами
 - `tun_if.c/h` - TUN interface API (init/write/close, cross-platform)
 - `tun_linux.c` `tun_freebsd.c` `tun_windows.c` - Platform-specific TUN implementations
 - `tun_route.c/h` - TUN routing table sync
 - `config_parser.c/h` - INI-style config file parsing
- `config_updater.c/h` - Config file modification utilities
+- `config_updater.c/h` - Проверка и сохранение согласованных X25519-ключей и node_id в INI-конфиге
 - `control_server.c/h` - Control/monitoring server (etcpmon backend API)
 - `firewall.c/h` - Firewall rules (per-interface filtering)
 - `eim_nat.c/h` - Endpoint-Independent Mapping NAT engine
- `nat_transport.c/h` - NAT transport layer (packet relay)
- `ntp_time.c/h` - NTP time synchronization
- `ntp_node_time.c/h` - Inter-node time synchronization
+- `nat_transport.c/h` - Передача IPv4 между отдельным TUN и удалённым NAT-провайдером через UTUN-router; локальный провайдер использует eim_nat
+- `ntp_time.c/h` - Асинхронная NTP-синхронизация: поправка времени instance без изменения часов ОС
+- `ntp_node_time.c/h` - Получение временной поправки от синхронизированных ETCP-пиров и диагностика расхождения часов
 - `broadcast.c/h` - Широковещательная рассылка данных по topo-группе (UUID-дедупликация, TTL)
 - `video/video.c/h` - Пробинг и транскодирование видео (FFmpeg, опционально; H.264/MP4 ≤720p)
 - `dnsmasq/` - Архив dnsmasq-2.93.tar.xz для встроенной сборки
@@ -298,74 +354,141 @@ MEMBER_SYNC=27
 - `etcp.c/h` - ETCP protocol implementation (inflight queues, retrans, ACK, RTT/jitter)
 - `etcp_api.c/h` - ETCP public API (send/recv/bind callbacks)
 - `etcp_connections.c/h` - Socket and link management, INIT handshake, keepalive, PING/PONG
+- `etcp_session.c/h` - Согласование эпох ETCP-сессии через HELLO/CHALLENGE/CONFIRM и проверка принадлежности DATA сессии
 - `etcp_loadbalancer.c/h` - Multi-link load balancing with traffic shaper
- `etcp_debug.c/h` - ETCP packet dump/formatting
+- `etcp_debug.c/h` - Диагностический разбор секций ETCP_DGRAM и форматирование IPv4-адресов
 - `etcp_dump.c/h` - ETCP дамп/декодирование пакетов
 - `etcp_bbr.c/h` - BBR congestion control for ETCP
- `etcp_connect.c/h` - ETCP outbound connections
 - `etcp_keepalive.c/h` - Keepalive-пакеты, адаптивный период, смена режима standby/normal (мобильные узлы)
 - `auto_socket.c/h` - Автосоздание UDP+TCP сокетов на всех интерфейсах и линков к ETCP-соединениям (`auto_sockets=yes`)
 - `pkt_normalizer.c/h` - Packet fragmentation/reassembly (packer/unpacker)
- `packet_dump.c/h` - Packet hex dump utility
- `dummynet.c/h` - Network emulator integrated into utun (for testing)
- `secure_channel.c/h` - AES-CCM encryption with X25519 key exchange, pubkey obfuscation
+- `packet_dump.c/h` - Текстовая сводка IPv4-пакета: адреса, поля транспорта и короткий hex-фрагмент
+- `dummynet.c/h` - Двунаправленный UDP-эмулятор между заданными endpoint: задержка, ограничение скорости и случайные потери
+- `secure_channel.c/h` - X25519, пакетное AES-128-CCM, потоковое AES-CTR, подписи Ed25519 и обфускация публичного ключа
+- `etcp_padding.c/h` - Выбор длины случайного padding и периодическое обновление диапазона для instance/соединения
+- `etcp_tx_stats.c/h` - Общая статистика исходящих очередей, inflight и подтверждённых за секунду байтов ядра
 - `crc32.c/h` - CRC32 checksums
- `stcp.c/h` - STCP протокол (Secure TCP)
- `stcp_server.c/h` - STCP сервер
- `stcp_client.c/h` - STCP клиент
- `stcp_link.c/h` - STCP линк-уровень
- `node_conn_direct.c/h` - Direct config-based connections
- `socket_monitor.c/h` - Socket state monitoring
+- `stcp.c/h` - Зашифрованные кадры поверх TCP: согласование ключей/эпох, AES-CTR, CRC, очереди и закрытие соединения
+- `stcp_server.c/h` - Приём входящих STCP-соединений, handshake и передача готового соединения владельцу
+- `stcp_client.c/h` - Исходящее STCP-подключение, в том числе через SOCKS5 и REALITY
+- `stcp_link.c/h` - Подключение STCP к ETCP_LINK: передача пакетов, backpressure и жизненный цикл TCP-линка
+- `socks_client.c/h` - Исходящий SOCKS5-транспорт: TCP CONNECT и UDP ASSOCIATE с переподключением control-сокета
+- `node_conn_direct.c/h` - Общий прямой транспорт к пиру с отдельным handle каждого владельца; обновление линков по адресам узла
+- `socket_monitor.c/h` - Наблюдение за адресами интерфейсов и маршрутами ОС, обновление сетевого состояния ETCP-сокетов
 - `reality.c/h` - REALITY-style TLS ClientHello/ServerHello камуфляж для STCP
 - `reality_fingerprint.c/h` - Статические отпечатки (cipher suites, groups, ALPN) для REALITY-камуфляжа
+- `reality_io.c/h` - Внешний REALITY-handshake и поток защищённых записей STCP, Finished, replay-защита и выбор relay
+- `reality_record.c/h` - TLS-подобные AES-128-GCM записи: вывод ключей, счётчики направлений, padding и KeyUpdate
 - `reality_relay.c/h` - Релей неавторизованных клиентов на реальный HTTPS-сайт
+- `stun_nat.c/h` - Проверка mapping/filtering NAT через внешние STUN-серверы, RFC 5780 и кеш результатов по IP/интерфейсу
+- `call_ring.c/h` - Кольцевой трейс контрольных точек освобождения ETCP/STCP-ресурсов для диагностики teardown/UAF

 **BBR (src/transport_layer/BBR/)**
 - `bbr_v3.c` - BBR congestion control algorithm v3

 **Routing Layer (src/routing_layer/)**
- `routing.c/h` - Routing table (local)
- `route_lib.c/h` - Routing library
- `route6_lib.c/h` - IPv6 routing
- `route_ping.c/h` - Route ping probing (NAT check, liveness)
- `route_connectivity.c/h` - Route connectivity checks
- `topo_group.c/h` - BGP-like route exchange between nodes (NODEINFO/WITHDRAW, изолированные группы UTUN/CHAT)
- `topo_group_connect.c/h` - Авто-подключение к узлам CHAT-группы (3 фазы, бесконечный цикл)
- `topo_group_invite.c/h` - Invite/join канала через прямое ncd-подключение (INVITE_INFO_REQ/RESP)
- `topo_node.c/h` - Node management (модель узла: TOPO_NODE/TOPO_GROUP_NODE, сериализация, node_registry)
- `topo_node_sqlite.c/h` - SQLite persistence for nodes
- `topo_recovery.c/h` - Восстановление каскадно отвалившихся узлов после разрыва соединения
+- `routing.c/h` - Обмен IPv4-пакетами UTUN между локальным TUN и сервисом DATA ETCP-router
+- `route_lib.c/h` - Локальная таблица IPv4-подсетей UTUN: добавление/удаление маршрутов и поиск узла назначения
+- `route6_lib.c/h` - Локальная таблица IPv6-подсетей на radix tree с поиском по самому длинному префиксу
+- `route_ping.c/h` - Пинг цели через явно выбранного BGP-посредника для NAT-проверки
+- `route_connectivity.c/h` - Прямые UDP/TCP-пробы адресов узла для оценки достижимости и RTT при выборе пиров
+- `topo_group.c/h` - Сессии UTUN/CHAT (JOIN/ACCEPT, эпохи, READY), групповые запросы, NODEINFO/WITHDRAW и владение NCD
+- `topo_group_connect.c/h` - Подбор пиров CHAT-группы по роли: суперузлы → desktop → mobile; история/RTT внутри класса, backoff и standby burst
+- `topo_group_invite.c/h` - Получение описания канала через INVITE_INFO_REQ/RESP; добавление мембера реализовано в chat_join/chat_sync
+- `topo_node.c/h` - Модель TOPO_NODE/TOPO_GROUP_NODE, подписанные снимки узлов, сериализация и общий node_registry
+- `topo_node_sqlite.c/h` - Хранение подписанных снимков узлов, адресов, каналов и блоков мемберов в общей SQLite
+- `topo_recovery.c/h` - Восстановление потерянных маршрутов группы через READY-сессии, отмена попыток при stop
 - `conn_mgr.h` + `conn_mgr_core.c`/`conn_mgr_indirect.c`/`conn_mgr_monitor.c` + `conn_mgr_priv.h` — Connection Manager (handle-based API, 3-phase DIR/REV/IND)
- `etcp_router.c/h` - ETCP router/multiplexer (мультиплексирование каналов, transit forwarding)
- `nat_detection.c/h` - NAT type detection
+- `etcp_router.c/h` - Надёжные логические каналы сервисов поверх BGP-маршрутов: ACK, окна, транзит и защита от циклов
+- `route_tx_stats.c/h` - Скользящее окно подтверждённых payload-байтов логического канала для оценки скорости доставки
+- `multicast.c/h` - Рассылка списку узлов группы с разделением маршрута на ветви, локальными подписками и отчётами о потерях
+- `nat_detection.c/h` - Проверка mapping и доступности входящих рабочих сокетов через ETCP-пиров с учётом предварительных STUN-измерений
+- `address_profile.h` - Профиль endpoint: изменение адреса, доступность входящих и источник измерения ETCP/STUN
+- `sock_match.c/h` - Классификация локальных сокетов и адресов пира, отбор совместимых пар для прямого подключения
 - `route_crypto.c/h` - Пред/пост-обработка SVC_ROUTE пакетов (encrypt-then-sign)

 **Chat (src/chat/)** — децентрализованный P2P чат: сообщения и участники автоматически синхронизируются между всеми узлами канала без центрального сервера.
- `chat_core.c/h` - Главный модуль чата. Единственная точка входа из GUI: принять сообщение, создать канал, изменить настройку. Управляет БД и жизненным циклом всех chat-модулей
+- `chat_core.c/h` - API сообщений, каналов, профиля и настроек; chat_service_start/stop управляют чат-сервисом поверх общей БД ядра
 - `chat_core_priv.h` - Внутренний API для частей chat_core: общий контекст и утилиты БД. Снаружи не используется
 - `chat_sync.c/h` - Связывает чат с ETCP-сетью: отслеживает появление/разрыв соединений, обновляет онлайн-статус узлов, запускает синхронизацию участников каналов, обрабатывает приглашения
 - `chat_event.c/h` - Доставка событий из ядра чата в GUI. Единый механизм: любой модуль отправляет событие (новое сообщение, смена участников, статус), GUI получает через один обработчик
- `chat_setting.c/h` - Настройки чата: проверяет корректность значений, хранит текущие. Используется и headless-парсером конфига, и GUI. Не зависит от других модулей
- `db_sync.c/h` - Автоматическая репликация данных между подключёнными узлами. Запись на одном узле — появляется у всех остальных. Криптоподписи и цепочка хешей защищают от подделок
+- `chat_setting.c/h` - Проверка и хранение настроек чата per-instance; общая логика для конфигурации и GUI
+- `chat_join.c/h` - Регистрация invite-ключа с ACK, пересылка запроса инвайтеру и добавление подписанного мембера; контракт join в заголовке
+- `db_sync.c/h` - Репликация подписанных записей SQLite через прямые ETCP-соединения; расхождения по цепочке хешей, новые записи через PUSH
 - `member_sync.c/h` - Синхронизация участников каналов поверх merkle_sync. Два подписанных блока (мембер/владелец), по-блочное сравнение версий, верификация подписей. Удаление — только битая запись
 - `merkle_sync.c/h` - Универсальный движок синхронизации на Merkle-деревьях (5 уровней × 32 бакета, SHA256). Пиры обмениваются хешами и передают только различия; per-session out-очередь с backpressure. Не привязан к конкретному типу данных (коллбэки `data_ops`)
- `chat_profile.c` - Собственный профиль: имя узла, сетевые адреса, сохранение UI-состояния (часть chat_core)
- `chat_channel.c` - Создание и настройка каналов: готовит таблицы в БД, генерирует криптоключи, запускает подключение ко всем участникам (часть chat_core)
+- `merkle_tree.c/h` - Производный индекс Merkle-хешей в SQLite; восстанавливается из данных модели, обновляется с ними в одной транзакции
+- `chat_profile.c` - Подписанный профиль мембера: имя, аватар и опции сервисов; локальное UI-состояние (часть chat_core)
+- `chat_channel.c` - Создание и настройка каналов: таблицы, криптоключи, CHAT-группа и планировщик подключения (часть chat_core)
 - `chat_msg.c` - Отправка и приём сообщений: запись в локальную БД, автоматическая рассылка всем участникам канала (часть chat_core)
+- `chat_feedback.c/h` - Подписанные реакции и ответы: версии состояния, сохранение отмен и Merkle-синхронизация между участниками
+- `chat_poll.c/h` - Создание опросов, голосование, реакции и JSON-снимки результатов для UI/headless
+- `chat_poll_codec.c` - Проверка и wire-кодеки опросов, ответов и реакций; общий каталог эмодзи (API в chat_poll.h)
+- `chat_attachment.c/h` - Зашифрованные вложения канала: ключи, запросы доступа, ручное одобрение автора и сохраняемый outbox
+- `chat_local.c/h` - Обнаружение устройств чата и обмен готовыми invite-ссылками через локальный UDP-транспорт
+- `group_avatar.c/h` - Подписанная аватарка канала: хранение версии в SQLite, проверка подписи и передача блоков через router
 - `chat_status.c` - Сбор диагностики: текущее время, активные соединения, типы NAT. Отправляется в GUI (часть chat_core)
 - `chat_member.c/h` - Единая структура мембера для отображения в GUI (десктоп/headless/Android), фиксированная сериализация на проводе
 - `chat_admin.c/h` - Передача канального приватного ключа (прав админа) другому узлу
 - `chat_whisper.c/h` - Whisper speech-to-text транскрипция голосовых сообщений (опционально, асинхронно через media_async)
 - `chat_headless_control.c/h` - TCP control-socket для headless chat CLI (JSON line protocol)
 - `invite_build.c/h` - Сборка invite-ссылок utun:// (выбор лучшего узла + адреса)
- `invite_link.c/h` - Формат invite-ссылок utun:// для каналов (base64: version|password|channel_id|pubkey|addrs)
+- `invite_link.c/h` - Кодирование utun://: версия, пароль, channel_id, join_key, Reality-параметры, ключ и адреса узла
+
+**Личные сообщения (src/dm/)**
+
+- `dm_core.c/h` - Беседы двух узлов, подписанные E2E-сообщения, SQLite/outbox, доставка через router/mailbox и квитанции
+- `dm_crypto.c/h` - Вывод ID беседы и ключа X25519, AES-256-CCM сообщений и E2E-контейнеры медиа через media_crypto
+- `dm_history.c/h` - Локальное удаление истории и скрытие бесед; поколения задач и отпечатки удалённых сообщений против повторов
+- `dm_mailbox.c/h` - Offline-очередь суперузла: хранение подписанных сообщений и повтор доставки до квитанции получателя
+- `dm_media.c/h` - Подготовка, доставка и публикация E2E-вложений; ciphertext-хранилище и отдельные квитанции файлов
+- `dm_media_priv.h` - Внутренние SQL/control-операции для dm_media и dm_mailbox_media
+- `dm_mailbox_media.c/h` - Сохраняемые задания суперузла для размещения медиа, доставки метаданных и удаления копий до DELETE_ACK
+
+**Звонки (src/call/)**
+
+- `call.c/h` - P2P аудио/видеозвонок: подписанный E2E-сигналинг, состояния, политика занятости и оптимизация пути через conn_mgr
+- `call_priv.h` - Общее внутреннее состояние сессии для call.c и call_video_transport.c; доступ только из uasync
+- `call_proto.h` - Wire-формат сигналинга, аудиокадров и управления видеотреком; треки/кодеки и причины завершения
+- `call_audio.c/h` - Общий аудио-движок: кодирование/декодирование Opus, jitter-буфер и тоны, API feed/pull PCM
+- `call_jitter.cpp/h` - FIFO Opus, адаптивный сетевой запас, декодирование на pull и восстановление воспроизведения после пауз
+- `call_jitter_window.h` - Окно из десяти секундных интервалов для оценки глубины очереди и изменения задержки доставки
+- `call_clock.h` - Метки времени захвата и снимок реально проигранного аудио для синхронизации видеотрека
+- `call_delay.cpp/h` - Уменьшение накопленной задержки PCM прямым ускорением и SoundTouch с сохранением исходной шкалы времени
+- `call_timeline.cpp/h` - Карта исходного PTS через обработку SoundTouch до позиции аудиоустройства
+- `call_video.c/h` - Общий формат H.264/H.265 видеотрека, согласование возможностей и сборка кадров из фрагментов
+- `call_video_bitstream.c/h` - Проверка конфигурации и IDR без reorder, профиля/уровня и геометрии H.264/H.265; KEY-пробы кодеков
+- `call_video_transport.c/h` - Отдельные router-каналы control/audio/video, backpressure, привязка видео к аудио и запросы KEY
+- `call_video_rate.c/h` - Регулятор битрейта и допуска новых видеокадров по скорости доставки, RTT и долгу очереди
+- `call_video_port.c/h` - Потокобезопасный обмен кадрами и командами между платформенными video workers и uasync-транспортом
+- `call_video_playout.c/h` - Расписание показа по аудиочасам, ожидание/отбрасывание кадров и подтверждение фактического показа
+- `call_video_fixtures.h` - Встроенные H.264/H.265 KEY-пробы для проверки базовых режимов кодека
+- `call_video_fast_fixtures.h` - KEY-пробы видеорежимов с частотой 60 fps
+- `call_video_fullhd_fixtures.h` - KEY-пробы видеорежимов Full HD
+- `call_video_portrait_fixtures.h` - KEY-пробы видеорежимов в портретной ориентации
+- `call_tones.c/h` - Генерация PCM-тонов паузы и завершения звонка
+- `call_headless.c/h` - Отдельный TCP-аудиосокет headless-клиента: обмен PCM; сигналинг остаётся на control-сокете
+
+**Рация (src/radio/)**
+
+- `radio.c/h` - Передача Opus по CHAT-группе, подписки, дедупликация и пересылка по ветвям с подписчиками
+- `radio_proto.h` - Wire-формат PTT: источник, поток, seq, FIN и hop-list против циклов
+- `radio_audio.c/h` - Общий аудио-движок: независимые RX/TX, Opus, микширование источников, ручной PTT и VAD-автомат
+- `radio_jitter.cpp/h` - Буфер кодированных кадров каждого источника с pre-roll и SoundTouch time-stretch на pull
+- `radio_vad.h` - Ресемплинг 48→16 кГц и автомат авто-PTT с подтверждением речи, задержкой завершения и учётом занятого канала
+- `radio_auto.h` - Общий автомат автопередачи по VAD/уровню звука, без захвата аудио и сетевого I/O
+- `radio_call.c/h` - Адресное приглашение участника в рацию канала: сигналинг вызова, занятость, принятие и отмена
+- `radio_headless.c/h` - TCP-аудиосокет headless-рации: PCM и команды начала/конца PTT

 **Прокси (src/proxy/)**
- `socks_proxy.c/h` - SOCKS5 прокси
- `udp_proxy.c/h` - UDP прокси
- `icmp_proxy.c/h` - ICMP прокси
- `tcp_proxy_server.c/h` - TCP прокси (серверная сторона)
- `tcp_proxy_client.c/h` - TCP прокси (клиентская сторона)
+
+- `proxy_protocol.h` - Общий TCP-протокол и управление потоком: CONNECTED, DATA, кредит WINDOW, упорядоченный FIN
+- `socks_proxy.c/h` - Клиентские SOCKS5 CONNECT и HTTP proxy/CONNECT, DNS и передача потока выбранному exit-узлу
+- `http_proxy.c/h` - Потоковый HTTP/1.x кодек: проверка заголовков, разбор тела/chunked и учёт потреблённых байтов для WINDOW
+- `udp_proxy.c/h` - Передача UDP из TUN через exit-узел, сопоставление ответов и удаление неактивных потоков
+- `icmp_proxy.c/h` - Проксирование IPv4 ICMP echo через raw socket exit-узла с восстановлением исходных id/seq
+- `tcp_proxy_server.c/h` - Exit-сторона TCP-прокси: реальные исходящие сокеты, потоки по (peer, stream_id), окна и half-close
+- `tcp_proxy_client.c/h` - Клиентская сторона TCP-прокси: адаптер TUN/lwIP и обмен с настроенным exit через ETCP-router

 **lwIP TCP (src/lwip_tcp/)**
 - `lwip_tcp.c/h` - lwIP TCP стек
@@ -374,31 +497,80 @@ MEMBER_SYNC=27
 - `lwip_tcp_priv.h`, `lwip_tcp_opts.h` - Внутренние настройки lwIP

 **Media Delivery (src/media_delivery/)**
- `media_delivery.c/h` + `media_delivery_proto.h` - Доставка медиафайлов, протокол
- `media_download.c/h` - Скачивание медиа
- `media_index.c/h` - Индексация медиафайлов
+- `media_delivery.c/h` - Доставка блоков медиа каналов, учёт держателей, репликация доступности между суперузлами и relay
+- `media_delivery_proto.h` - Кодограммы канального медиа: QUERY, BLOCK_REQ/CHUNK/DONE, HAVE_BLOCK и SUPER_REPL
+- `media_download.c/h` - Загрузка блоков с выбором держателей, failover, контролем простоя, проверкой подписей и сборкой файла
+- `media_index.c/h` - Индекс media_files: UUID, хеши и подписи блоков, асинхронная регистрация и удаление медиа канала
+- `file_transfer.c/h` - Передача неизменяемого файла между заданными узлами; авторизация lookup и владение CM handle до завершения

 **Media Async (src/media_async/)**
- `media_async.c/h` - Асинхронный движок (thread-per-task для crypto/file операций)
+- `media_async.c/h` - Фоновые crypto/file-задачи: work в pthread, done в uasync; destroy ждёт workers и завершает ожидающие callbacks с CANCELLED
+- `attachment.c/h` - Общие метаданные file/voice/video, проверка и компактная wire-сериализация
+- `voice_file.c/h` - Worker-кодирование PCM в контейнер Opus с длительностью и waveform для desktop/Android
+- `attachment_send.c/h` - Асинхронная подготовка голоса/видео и отправка в зафиксированный канал или DM
+- `media_crypto.c/h` - Общие AES-256-CCM примитивы и порционное шифрование/проверка файлов для DM и групповых вложений
+- `encrypted_file.c/h` - Контейнер группового вложения: шифрование метаданных/файла, проверка SHA256 и durable-публикация результата
+
+**Трансляции (src/stream/)** — live-аудио/видео CHAT-группы с подписью источника, Reed–Solomon и раздачей через участников.
+
+- `stream.c/h` - Жизненный цикл трансляции, локальные handles издателя/читателей, события и публикация подписок
+- `stream_priv.h` - Внутренний доступ к сессиям, приём проверенных DATA/END и взаимодействие с планировщиком relay
+- `stream_proto.h` - Форматы подписанной пачки и RS-частей, дескриптор источника, размеры и коды результата
+- `stream_block.c/h` - Подпись пачки Ed25519 до RS-кодирования, разбор частей и проверка восстановленных данных
+- `stream_buffer.c/h` - Ограниченное кольцо RS-частей: дедупликация, восстановление пачек, проверка подписи и вытеснение старых данных
+- `stream_source.c/h` - Упаковка исходных байтов в подписанные RS-пачки, сброс неполной пачки по таймеру и завершение источника
+- `stream_member.c/h` - Объявления источников и подписок в опциях подписанного мембера; разбор и проверка принадлежности источника
+- `stream_wire.c/h` - Протокол выдач и relay: кодограммы управления, пути, метрики и подписанное завершение END
+- `stream_network.c/h` - Выдача блоков через прямой ETCP, NCD-владение, управляющие очереди, аренда подписок и reverse-запросы
+- `stream_optimizer.c/h` - Автоматический выбор и перенос поставщиков субпотоков, пробы доступности и привлечение relay
+- `stream_metrics.c/h` - Оценка относительного отставания субпотока и истории проблем по часам источника без NTP
+- `stream_load.c/h` - Учёт логической очереди DATA и её роста для обнаружения перегрузки раздающего узла
+- `stream_media.c/h` - Формат uAV2: упаковка/проверка видеокадров, конфигурации кодека, PTS и Opus внутри FEC-пачек
+- `stream_media_buffer.c/h` - Медиаиндекс общего RS-кольца и независимые курсоры audio/video; сборка кадров и восстановление с KEY
+- `stream_publisher.c/h` - Общий потокобезопасный publisher desktop/Android: очередь готовых кадров, публикация и завершение с FIN
+- `stream_viewer.c/h` - Независимые viewers: запрос ограниченных батчей по бюджетам треков, уведомления готовности и конца audio/video
+- `stream_playback_audio.cpp/h` - Opus/SoundTouch и очередь готового PCM; ускорение без изменения высоты и привязка к позиции устройства
+- `stream_playback_clock.c/h` - Общие часы воспроизведения и плавный догон live-потока по непрерывному запасу готового материала
+
+**Файлы участников (src/member_files/)**
+
+- `member_files.c/h` - Сервер и асинхронный клиент хранилища CHAT-группы: права доступа, запросы и события через защищённый router
+- `protocol.c/h` - Wire-кодек файловых команд, снимки версий каталогов/файлов и токены временных загрузок
+- `storage.c/h` - Серверные каталоги участников, квоты, файловые операции, временные загрузки и их очистка
+- `transfer.c` - Передача файлов с CM handle, backpressure, дисковым worker, проверкой хеша и публикацией результата
+- `disk.c/h` - Дисковые примитивы POSIX/Windows: безопасное разрешение путей без ссылок и I/O по 64-битному смещению
+- `worker.c/h` - Единственный дисковый pthread с ограниченной очередью и возвратом результатов в uasync
+- `private.h` - Внутреннее состояние запросов, передач, серверного хранилища и дискового worker
+
+**Локальная сеть (src/local_transport/)**
+
+- `local_transport.c/h` - Открытый UDP-транспорт LAN: обнаружение устройств, доставка сообщений с ACK/повторами и ограничения входящего потока
+- `platform.c/h` - Снимок IPv4/IPv6 интерфейсов, broadcast/multicast-адреса, приём метаданных UDP и проверка локальности источника
+- `protocol.h` - Wire-формат объявлений, сообщений и ACK: ID/эпохи устройств, ID запроса и проверка UTF-8 имени

 **Libraries (lib/)**
 - `u_async.c/h` - Async event loop (epoll/poll/select, timers via timeout_heap)
- `ll_queue.c/h` - Lock-free linked list queue with callbacks, hash index, threshold waiter
- `memory_pool.c/h` - Fast object pool allocator (pre-allocated blocks)
+- `ll_queue.c/h` - Двусвязная очередь одного uasync-потока с callbacks, хеш-индексом и ожиданием свободного места
+- `memory_pool.c/h` - Пул объектов: ленивое выделение и повторное использование, до 64 свободных объектов в кеше
 - `debug_config.c/h` - Debug logging system (levels, categories, dual output, runtime config)
 - `timeout_heap.c/h` - Min-heap for timer management (used by u_async)
 - `mem.c/h` - Memory wrappers with leak tracking (`u_malloc`/`u_free`/`u_calloc`/`u_strdup`)
 - `serialize.c/h` - Binary serialization utilities
+- `reed_solomon.c/h` - Кодирование и восстановление пачки данных Рида—Соломона с настраиваемым числом субблоков и избыточностью
+- `video_plane.c/h` - Копирование YUV-плоскости с поворотом 0/90/180/270°, учётом stride и проверкой границ без выделения памяти
 - `swm_min.c/h` - Sliding window minimum (for RTT min tracking)
- `getmyip.c/h` - Get local IP / default route detection
+- `getmyip.c/h` - Локальный IP, который ОС выберет для UDP к заданному адресу (bind/connect/getsockname)
 - `myip.c` - My IP helper (no header)
 - `socket_compat.c/h` - Cross-platform socket compatibility (Linux/FreeBSD/Windows)
 - `platform_compat.c/h` - Cross-platform compatibility layer (byte order, time, random)
 - `radix.c/h` - Radix tree for IP routing lookups
- `tcp_io.c/h` - TCP I/O abstraction (Windows IOCP, Linux epoll)
+- `tcp_io.c/h` - Неблокирующий TCP поверх uasync/ll_queue: backpressure, FIN/close и callbacks
 - `sqlite3.c/h` - SQLite3 amalgamation (embedded database)
 - `opus_codec.c/h` - Opus audio codec wrapper
 - `audio_compressor.c/h` - Audio dynamic range compressor
+- `speex_aec.c/h` - Эхоподавление SpeexDSP: согласование playback/capture PCM через линию задержки и диагностика её заполнения
+- `silero_vad.c/h` - Стриминговый VAD через ONNX Runtime: окна 512 отсчётов, 16 кГц моно, вероятность речи и сброс состояния
+- `silero_vad_model.inc` - Встроенная ONNX-модель Silero VAD для silero_vad_create_default
 - `json_flat.c/h` - Flat JSON parser
 - `strbuf.c/h` - Безопасный растущий printf-буфер (замена snprintf-цепочек)
 - `async_dns.c/h` - Асинхронный (неблокирующий) DNS-резолвер A-записей поверх uasync, адаптер над libdns
@@ -407,8 +579,20 @@ MEMBER_SYNC=27
 - `dr_mp3.h` - MP3-декодер (single-header, на базе minimp3)
 - `liblmdb/` - Встраиваемый key-value store LMDB
 - `libopus/` - Встраиваемый кодек Opus
+- `speexdsp/` - Встроенные исходники эхоканселлера SpeexDSP и KISS FFT
+- `soundtouch-master/` - SoundTouch: изменение темпа аудио в jitter-буферах звонка и рации
 - `wintun.h` - Wintun API header for Windows TUN driver

+**Проверки (tests/)**
+
+- `Makefile.am` - Состав тестовых целей, зависимости и отдельные проверки runner, service IDs и скрипта сборки
+- `run_tests.py` - Запуск тестов ограниченным пулом с отдельными логами и последовательными барьерами для CPU/LAN-проверок
+- `test_run_tests.py` - Проверки пула runner, эксклюзивного запуска, обработки ошибок и сигналов
+- `test_service_ids.py` - Проверка уникальности ID транспортных и router-сервисов
+- `test_build_script.py` - Регрессии выбора платформы, конфигурации и инкрементальной работы build.sh
+- `stream_netns/` - Linux network namespaces: топологии, NAT/STUN-сценарии и проверка трансляций в изолированной сети
+- `local_transport_ipv6.sh` - Проверка IPv6 link-local обнаружения и доставки в изолированной локальной сети
+
 **Memory Pools in UTUN_INSTANCE:**
 - `data_pool` — для данных пакетов (payload), используется input_queue/output_queue фрагментами
 - `pkt_pool` — для struct ETCP_DGRAM (сетевые пакеты на отправку/приём)
@@ -416,7 +600,7 @@ MEMBER_SYNC=27

 ### Key Components
 - **UASYNC:** One per thread. Async event loop (epoll/poll), timers via timeout_heap
- **LL_QUEUE:** Lock-free queue with auto-callback, hash index lookup, threshold waiter
+- **LL_QUEUE:** Очередь с auto-callback, хеш-индексом и threshold waiter; не средство обмена между потоками
 - **Memory Pool:** Fast allocation for hot-path objects (packets, inflight entries, fragments)
 - **ETCP:** TCP-like reliable protocol with encryption, multi-link, load balancing
 - **Secure Channel:** AES-CCM + X25519 key exchange, nonce-based encryption, pubkey obfuscation
@@ -432,6 +616,8 @@ MEMBER_SYNC=27
 - Очереди забивать нельзя. Добавляй следующий элемент только когда очередь стала пустой.
 - Порог задаётся через `queue_set_threshold(q, max_packets, max_bytes)`.
 - Используй `queue_waiter_wait` для ожидания освобождения очереди до заданного порога.
+- Handle ожидания обнуляется целиком, живёт до callback/отмены и отменяется до освобождения владельца.
+  Callback может быть синхронным. `queue_entry_free` не освобождает dgram — его освобождают отдельно.

 ### Чтение из очереди
 - Используй `queue_set_callback`: при вызове callback обработай один или несколько элементов, потом вызови `queue_resume_callback`.
@@ -451,7 +637,8 @@ MEMBER_SYNC=27
 ## Config Rules
 - В серверном конфиге только собственные ключи и нет секций `[client]`
 - В клиентском конфиге есть собственные ключи и pubkey каждого сервера в секции `[client]`
- Chat-настройки хранятся в секции `[chatserver]` (принимается также `[chat]`). Парсер вызывает `chat_setting_set(key, value)` для каждого ключа — неизвестные ключи вызывают ошибку. Пример:
+- Chat-настройки хранятся в `[chatserver]` (также `[chat]`). Парсер обрабатывает общие поля секции,
+  затем вызывает `chat_setting_set_state(&cfg->global.chat_settings, key, value)`; неизвестные ключи логируются как ошибка. Пример:
  ```ini
  [chatserver]
  storage_autoload=1
@@ -474,7 +661,8 @@ MEMBER_SYNC=27
 Если видишь спам-логи - подумай как их выборочно отключить чтобы не мешали.

 Для отладки добавляй в DEBUG_CATEGORY_DEBUG диагностические сообщения где надо. И включи эту категорию в настройках. Убирай только после проверки (путём запуска) когда все ошибки устранены.
-сообщение выводится по или - либо debug_set_level(DEBUG_LEVEL_TRACE) - выводится ВСЁ независимо от настроек по категориям. Тоесть берется max(global level, category lavel)
+Явный уровень категории заменяет глобальный. DEBUG_LEVEL_NONE наследует глобальный уровень;
+DEBUG_LEVEL_DISABLED полностью отключает категорию, в том числе при глобальном TRACE (см. debug_should_output).

 Твой бич - ты постоянно гадаешь и анализируешь код. Что приводит к снежному кобу ошибок и неверных гипотез. 10 раз повторяю - только логи логи логи и никакого гадания. Лоооги!!! правильные логи покажут всё с предельной точностью. Вся суть отладки - информативные логи
 И смотри логи. не задавливай их grep-ом. лучше больше. единственное с чем борись - это бесполезные спам логи.
@@ -484,7 +672,8 @@ MEMBER_SYNC=27

 Но полезные смотри всегда, и всегда оставляй логи которые выводятся нечасто.
 Частые логи - это трафик которые >100 раз повторяются. Но которые мало раз обязательно оставлять и выводить.
-можешь в тесте включить логи в нужный интервал чтобы не спамить. debug_set_level(DEBUG_LEVEL_TRACE) и выключить debug_set_level(DEBUG_LEVEL_NONE)
+В тесте можно временно поднять нужные категории до TRACE, сохранив прежние уровни и восстановив их после участка.
+Одного debug_set_level(DEBUG_LEVEL_NONE) недостаточно для отключения категорий с явно заданным уровнем.
 Если видишь проблему и ее решение неочевидно то выстраивай диагностику вокруг неё пока не будет очевидно где и что происходит не так. Это базовое и обязательное требование к отладке.
 Подробные логи ты должен выводить не обрезая всегда и анализировать. Если лог большой - выведи в файл и анализируй файл.
 Рассуждение должно быть примерно таким:
@@ -526,7 +715,7 @@ MEMBER_SYNC=27
 - Нельзя ничего восстанавливать из репозитория не спрашивая
 - Для отладки не printf а DEBUG_*
 - Запрещено прямое включение arpa/inet.h, sys/time.h, unistd.h — использовать ../lib/platform_compat.h + socket_compat.h
- Перед сборкой всегда make clean
+- Меняй режим и флаги сборки через `./build.sh`: он отслеживает конфигурацию и очищает объекты только при необходимости.
 - Все лишнее что менял при отладке - строго вернуть назад в состояние до вмешательства

 ## Написание кода
@@ -535,12 +724,17 @@ MEMBER_SYNC=27
 - Обязательно наличие подробной диагностики в функциях кода которые не сильно спамят (не часто вызываются).
 - Для каждого отладочного вывода подумай какая из доступной информация будет полезна чтобы можно было наиболее завершенно оценить состояние алгоритма и состояний влияющих на алгоритм.

+## Оформление кода
+- в .c: перед каждой функцией - краткое но понятное описание что делает функция (кроме совсем простых)
+- в .h: в начале - описание модуля - для чего предназначен, как пользоваться, нюансы. Далее структуры с комментариями, далее публичные функции с описаниями (что делает, как пользоваться, какие аргументы, возврат, нюансы работы)

 ## chatgui (GUI Chat Client)

-Chatgui — десктопный GUI-чат на Qt 6 (Qt 5 fallback), отдельный проект внутри репозитория. Не связан с autotools-сборкой utun.
+Chatgui (бинарник `vibechat`) — десктопный чат на Qt 6 (Qt 5 fallback), отдельная CMake-сборка общего ядра.
+Корневой `build.sh` дополнительно вызывает её, если уже существует `tools/chatgui/build/CMakeCache.txt`.

-В chat gui интегрированы библиотеки utun. Чат и библиотеки работают в разных потоках. Поэтому нужно использовать семафоры, сокеты или другие механизмы синхронизации (uasync_post, uasync_memsync, uasync_get_wakeup_fd)
+GUI работает в Qt-потоке, ядро и чат — в uasync-потоке. Команды передаются через
+`gui_bridge_post_uasync()` / `uasync_post()`, события возвращаются через Qt-сигналы.

 База данных sqlite в chatgui: можно писать (update) из потока utun / instance. можно только читать из gui потока.

@@ -548,38 +742,45 @@ Chatgui — десктопный GUI-чат на Qt 6 (Qt 5 fallback), отде
 - **Язык:** C++20
 - **Фреймворк:** Qt 6 (предпочитаемый) или Qt 5.15+ (Widgets + Network)
 - **Сборка:** CMake 3.16+
- **БД:** SQLite3 (WAL mode, встроенный `db/sqlite3.c` amalgamation)
+- **БД:** SQLite3 (WAL mode, компилируется общий `lib/sqlite3.c`)
 - **Анимации:** rlottie (C API) + zlib (gzip-декомпрессия TGS)

 ### Сборка
 ```bash
 # Установка зависимостей
-sudo apt install librlottie-dev zlib1g-dev qt6-base-dev
+sudo apt install librlottie-dev zlib1g-dev qt6-base-dev libssl-dev libx11-dev libxfixes-dev libpipewire-0.3-dev
 # или qtbase5-dev для Qt 5 fallback

 # Сборка
 cd tools/chatgui && mkdir -p build && cd build
 cmake .. && make -j4
-./chatgui
+./vibechat
 ```

 ### Конфиг и логи чатгуи
- **Конфиг:** `tools/chatgui/build/chatgui.cfg` (в `.gitignore`, содержит приватные ключи)
+- **Конфиг:** `vibechat.cfg` рядом с бинарником (обычно `tools/chatgui/build/vibechat.cfg`, содержит приватные ключи)
  - Секция `[gui]`: `debug_file`, `debug_level`, `debug_categories=cat=level,...`
  - Секция `[control]`: `ip`, `port` для подключения etcpmon
  - Секция `[ntp]`: синхронизация времени
 - **Лог:** `tools/chatgui/build/chatgui.log` (путь задаётся в конфиге `debug_file`)
- **БД чата:** `tools/chatgui/build/chat_data/` (SQLite, путь из `db_path` в конфиге)
+- **БД чата:** `chats.db` в каталоге `[gui] db_path` (по умолчанию `chat_data/` рядом с бинарником)

 ### Структура файлов (src/)

 | Файл | Назначение |
 |------|-----------|
-| `main.cpp` | Точка входа, инициализация QApplication |
-| `mainwindow.h/cpp` | Главное окно, QSplitter (ChannelList \| MessageList \| AccountList), трей |
-| `chatview.h/cpp` | QListView с фоновым изображением, hover-сигнал, drag-to-select |
-| `messagelist.h/cpp` | QStandardItemModel, stub-данные, инициализация анимаций, hover→activate |
+| `main.cpp` | Точка входа, QApplication, язык интерфейса и запуск единственного экземпляра профиля |
+| `single_instance.h/cpp` | Блокировка каталога профиля и передача запроса показа окна уже работающему экземпляру |
+| `gui_language.h` | Выбор языка интерфейса независимо от регионального формата дат и чисел |
+| `mainwindow.h/cpp` | Главное окно, каналы/DM, трей, события ядра, звонки, локальные приглашения и окна трансляций |
+| `chatview.h/cpp` | Список сообщений: фон, hover, выделение текста и прокрутка истории мышью/клавиатурой |
+| `messagelist.h/cpp` | Модель сообщений из БД, обновления доставки/медиа, анимации, состояние просмотра канала |
 | `messagedelegate.h/cpp` | QStyledItemDelegate: бабблы, текст, цитаты, реакции, оверлей анимаций |
+| `messagefeedback.cpp` | Действия MessageList: создание опроса, голосование, выбор реакции и показ результатов |
+| `attachment_key_ui.cpp` | Список запросов на расшифровку групповых вложений и решения автора о выдаче ключа |
+| `message_links.h/cpp` | Разбор границ utun:// и HTTP/HTTPS ссылок для подсветки и обработки нажатий в сообщении |
+| `message_notification.h/cpp` | Уведомление о сообщении без захвата фокуса, переход в беседу и скрытие после активности пользователя |
+| `user_activity_monitor.h/cpp` | Ожидание первой активности через системный idle time либо события приложения |
 | `emoji.h/cpp` | EmojiData/EmojiCategory/EmojiType, 4 категории, `g_animatedEmojiMap` |
 | `emojipanel.h/cpp` | Эмодзи-пикер: QTabWidget + QGridLayout, EmojiButton с hover-анимацией |
 | `emojitabbar.h/cpp` | Кастомный QTabBar для эмодзи-панели |
@@ -595,33 +796,98 @@ cmake .. && make -j4
 | `invitedialog.h/cpp` | Диалог приглашения пользователя |
 | `invite_link.h/cpp` | Логика invite-ссылок |
 | `inviteby.h/cpp` | Диалог приглашения по invite-ссылке (отправка через узел) |
+| `dminvitedialog.h/cpp` | Выбор канала для приглашения собеседника из DM с сопоставлением результата по request_id |
 | `settingsdialog.h/cpp` | Окно настроек |
 | `creategroupdialog.h/cpp` | Диалог создания группы |
 | `channelsettingsdialog.h/cpp` | Диалог настроек канала |
 | `renamedialog.h/cpp` | Диалог переименования |
 | `networksettingspage.h/cpp` | Страница сетевых настроек |
+| `addressprofiletext.h` | Читаемое представление mapping, доступности входящих и источника NAT-измерения |
 | `nodespage.h/cpp` | Таблица узлов + дамп в настройках |
 | `statuspage.h/cpp` | Страница статуса (NTP + соединения + живые часы) |
 | `databasesettingspage.h/cpp` | Страница обслуживания БД в настройках |
 | `storagesettingspage.h/cpp` | Страница настроек хранилища |
 | `soundsettingspage.h/cpp` | Страница настроек звука |
 | `audiodevicesettingspage.h/cpp` | Страница настроек аудиоустройств |
-| `sound_manager.h/cpp` | Управление звуками/уведомлениями |
-| `audiorecorder.h/cpp` | Запись голосовых сообщений (захват аудио) |
-| `voicemessageencoder.h/cpp` | Кодирование голосовых сообщений (Opus) |
+| `sound_manager.h/cpp` | Общий miniaudio-контекст, уведомления/PCM, микширование голоса, маршруты устройств и восстановление |
+| `audio_device.h/cpp` | Жизненный цикл miniaudio-устройства, прогресс callbacks, пауза и повтор запуска после сбоя |
+| `audio_buffer_tuning.h` | Подбор размера аппаратного аудиобуфера по повторным XRUN с сохранением настройки при reopen |
+| `audio_capture.h/cpp` | Совместное использование одного микрофона трансляцией и рацией, подписки PCM и смена профиля захвата |
+| `audio_capture_lease.h` | Владение захватом, исключающее одновременную работу publisher, звонка и записи голосового сообщения |
+| `audio_event_queue.h` | Ограниченная очередь PCM/команд с несколькими producers и резервом для управляющих событий |
+| `audio_frame_ring.h` | Предвыделенное SPSC-кольцо кадров переменной длины под mutex; при переполнении удаляет старейший |
+| `voice_audio_io.h/cpp` | Workers захвата/AEC и воспроизведения; упорядочивание PCM/PTT/mute и итоговый render-reference |
+| `voice_capture_clock.h` | Непрерывные PTS захваченного PCM по позиции сэмплов с плавной поправкой аппаратного времени |
+| `voice_playback_buffer.h` | Адаптивный запас готового PCM: увеличение после недостачи и уменьшение при стабильном выводе |
+| `audiorecorder.h/cpp` | Захват голосовых сообщений, worker обработки PCM, компрессор, индикатор уровня и передача записи задаче |
+| `voicemessageencoder.h/cpp` | Выбор Opus preset и создание медиа-каталога; кодирование выполняет общий voice_file |
 | `voiceplayback.h/cpp` | Воспроизведение голосовых сообщений |
-| `media_blocks.h/cpp` | Чтение/сборка фрагментированных медиафайлов |
+| `callwindow.h/cpp` | Окно аудио/видеозвонка: управление, выбор камеры, локальное/удалённое видео и статистика |
+| `call_audio_engine.h/cpp` | Desktop-контур звонка: захват, VoiceAudioIo, общий выход SoundManager и завершение аудиосессии |
+| `call_video_engine.h/cpp` | Desktop-видеозвонок: камера, TX/RX workers, обмен с ядром и показ кадров по аудиочасам |
+| `call_video_encoder.h/cpp` | Кодер звонка: согласованный формат, смена битрейта с drain прежнего кодера и подтверждение настройки |
+| `call_video_decoder.h/cpp` | FFmpeg-декодер H.264/H.265 с выбором GPU/CPU и сохранением PTS при задержанном выходе |
+| `video_capture.h/cpp` | Асинхронный capture-процесс, каталог источников, watchdog и независимое от GUI закрытие |
+| `video_capture_worker.cpp` | Камера/экран/окно, преобразование в CPU RGB32 и диагностика этапов аппаратного закрытия |
+| `video_capture_source.h` | Контракт backend внутри worker и точка входа для тестовых источников |
+| `video_capture_protocol.h` | Поколения, FRAME/ACK, этапы/heartbeat и ограничения IPC видеозахвата |
+| `video_capture_buffer.h` | Однокадровый shared-memory буфер согласованной ёмкости до 4096×4096 RGB32 |
+| `call_camera_rate.h` | Временное отключение снижения FPS из-за автоэкспозиции V4L2 с восстановлением настройки камеры |
+| `call_video_cadence.h` | Отбор исходных кадров под заданный FPS без накопления ошибки дробного периода |
+| `call_video_capture_clock.h` | Привязка времени камеры к монотонным часам с коррекцией задержки первого callback |
+| `call_video_queue.h` | Ограниченная SPSC-очередь кадров между video workers без mutex и выделений памяти |
+| `call_video_wake.h` | Пробуждение video worker по событию или абсолютному монотонному deadline на POSIX/Windows |
+| `radio_audio_engine.h/cpp` | Desktop-контур рации: независимые захват/прослушивание, PTT/VAD и подключение к общему выходу |
+| `radiopanel.h/cpp` | Панель активной рации: выбор аудиоустройств, VAD, PTT и состояние передачи из ядра |
+| `radiosettingspage.h/cpp` | Настройки рации и запись глобальных сочетаний PTT |
+| `ptt_hotkey_manager.h/cpp` | Глобальный PTT: физические клавиши Windows/X11, системный портал Wayland |
+| `ptt_key_chord.h` | Хранение физических сочетаний с отдельными левыми/правыми модификаторами и запись одновременного нажатия |
+| `ptt_portal.h/cpp` | D-Bus-сессия GlobalShortcuts для Wayland, настройка сочетаний и обработка нажатий/отпусканий |
 | `imageviewer_window.h/cpp` | Окно просмотра изображений |
 | `videoplayer_engine.h/cpp` | Движок декодирования видео |
 | `videoplayer_window.h/cpp` | Окно просмотра видео |
+| `live_video_encoder.h/cpp` | Общий FFmpeg-кодер live-видео для звонка/трансляции, GPU/CPU, KEY-конфигурация и capture PTS |
+| `video_frame_image.h` | Выделение выровненного RGB-буфера FFmpeg и передача владения QImage без копирования |
+| `stream_publish_engine.h/cpp` | Публикация камеры/экрана и Opus: workers кодирования, локальный preview и завершение через общий publisher |
+| `stream_publish_window.h/cpp` | Настройки и управление трансляцией; закрытие окна сохраняет работающий engine |
+| `stream_portal_capture.h/cpp` | Захват экрана Wayland через ScreenCast portal/PipeWire, выбор монитора и режима курсора |
+| `stream_screen_cursor.h/cpp`, `stream_screen_cursor_win.cpp` | Наложение системного курсора на кадр выбранного экрана средствами X11/Windows |
+| `stream_video_modes.h` | Выбор размеров/FPS камеры и пропорционального масштабирования экрана для трансляции |
+| `stream_qp_control.h` | Плавная корректировка потолка QP по фактическому выходному видеобитрейту |
+| `stream_sources.h` | Разбор снимка активных источников канала из CHAT_EVT_STREAM_SOURCES |
+| `streamplayer_window.h/cpp` | Просмотр live-потока: отдельные audio/video workers, смешивание PCM и синхронизация по часам устройства |
+| `streamgrid_window.h/cpp` | Сетка трансляций канала и разворачивание плитки с сохранением плееров; своя плитка использует локальный preview |
 | `connmonitorwindow.h/cpp` | Окно мониторинга ETCP-соединений (standalone) |
 | `qrcode_utils.h/cpp` | Утилиты для QR-кодов |
 | `debug_ui.h` | Отладочный UI |

 ### Другие поддиректории
- `db/` — SQLite3 amalgamation (`sqlite3.c/h`), `db_manager.h/cpp` (схема: nodes, node_addresses, channels, msg_<channel>, peers_<channel>, local_identity, accounts, ui_state)
- `transport/` — интеграция с uTun: `gui_bridge.h/gui_bridge_impl.cpp` (Qt signal-based обмен), `node_config.h/cpp` (конфиг узла), `config_updater.h/cpp` (правка конфига), `utun_node.h/cpp` (обёртка узла), `miniaudio_impl.c` (single-header miniaudio в отдельной единице трансляции). Chat-логика (`chat_core`, `chat_sync` и т.д.) компилируется напрямую из `src/chat/`, роутинг — из `src/routing_layer/` (см. `libutun/CMakeLists.txt`)
+
+- `db/` — `db_manager.h/cpp`: доступ GUI к данным nodes, channels, msg_<channel>, peers_<channel> и состоянию интерфейса;
+  копия `db/sqlite3.c/h` не используется текущей CMake-целью, SQLite берётся из `lib/`
+- `transport/` — интеграция GUI с ядром; файлы перечислены ниже
+- `src/avatars/` — `avatarmanager.h/cpp`: загрузка/публикация аватаров участников через member_files, подписанные ссылки и очередь передач;
+  `avatarcache.h/cpp`: дисковый кеш, подготовка изображений и очистка; `avatarcrop.h/cpp`: выбор области;
+  `avatargallery.h/cpp`: просмотр аватаров пользователя; `groupavatarmanager.h/cpp`: подготовка и кеш подписанных аватарок каналов
+- `src/member_files/` — `browser.h/cpp`: браузер серверных файлов группы; `batch.h/cpp`: последовательные операции над файлами/деревьями,
+  фоновый локальный обход, загрузка/скачивание и отмена
+- `libutun/CMakeLists.txt` — состав и зависимости CMake-сборки общего ядра из `src/` и `lib/`
+- `CMakeLists.txt` — приложение vibechat, Qt-зависимости, ресурсы и цели GUI-тестов
+- `tests/` — проверки аудиотракта, PTT, видеозвонка, захвата камеры/экрана, трансляций, файлового браузера и GUI-компонентов
 - `resources/` — `bg.jpg`, `chatgui.qrc` (встраивает 5 TGS в бинарник), `animations/*.tgs`
+- `zxing-cpp/` — встроенная библиотека QR-кодов; `third_party/qhotkey/` — исходники QHotkey
+
+### Интеграция с ядром (transport/)
+
+| Файл | Назначение |
+|------|-----------|
+| `gui_bridge.h` / `gui_bridge_impl.cpp` | Команды GUI → uasync и события ядра → Qt-сигналы |
+| `utun_node.h/cpp` | Запуск и остановка ядра/чата в выделенном uasync-потоке |
+| `node_config.h/cpp` | Загрузка и сохранение конфигурации узла |
+| `config_updater.h/cpp` | Изменение настроек в конфиге |
+| `miniaudio_impl.c` | Реализация single-header miniaudio в отдельной единице трансляции |
+| `audio_diagnostics.h/cpp` | Диагностика этапов аудио и событий backend; записывает метаданные без PCM |
+| `stream_bridge.h/cpp` | Потокобезопасный мост к общим publisher/viewers: session IDs, каталог источников, запросы батчей и пробуждение workers |

 ### Система анимированных эмодзи

@@ -715,18 +981,33 @@ void lottie_animation_destroy(Lottie_Animation *anim);
 ---

 ## Key Documentation Files
- `/doc/etcp_protocol.txt` - ETCP протокол (формат кодограмм, ACK, handshake, keepalive)
- `/doc/etcp_arch.md` - ETCP архитектура
- `/doc/etcp_config.txt` - Конфигурация ETCP
- `/doc/etcp_router_arch.md` - ETCP роутер архитектура
- `/doc/route_p2pconn.txt` - Route peer-to-peer соединения
- `/src/route_bgp.txt` - BGP обмен маршрутами (дизайн-документ)
- `/doc/chat_join_test.md` - ТЗ теста join-протокола (chat_join + дерево приглашений)
- `/doc/chat_join_test_tasks.md` - Список задач по тесту join (текущий статус, пошагово)
+
+- `doc/service_lifecycle.md` — ядро, независимые сервисы, владение ресурсами и остановка
+- `doc/node_snapshot.md` — подписанная запись узла, timestamp, SQLite и обновление NCD
+- `doc/etcp_protocol.txt` — ETCP: кодограммы, ACK, handshake, keepalive
+- `doc/etcp_arch.md` — архитектура ETCP
+- `doc/etcp_router_arch.md` — архитектура маршрутизатора
+- `src/chat/chat_join.h` — нормативный протокол добавления участника
+- `src/routing_layer/topo_group.h` — протокол групповой сессии и критерий READY
+- `tests/test_chat_join_e2e.c`, `tests/test_topo_recovery.c`, `tests/test_services.c` — проверки join, recovery и жизненного цикла
+- `doc/dm_arch.md`, `doc/chat_call_arch.md` — личные сообщения и звонки
+- `doc/call_video.txt` — видеотрек звонка: возможности кодеков, транспорт, битрейт, аудиочасы и показ кадров
+- `doc/stream.txt` — трансляции: RS-пачки, выдачи/relay, выбор поставщиков, медиакурсоры и платформенные плееры
+- `doc/stun_nat.md`, `doc/nat_detection.txt` — STUN-измерения и определение доступности рабочих UDP-сокетов
+- `doc/member_files.txt` — файловое хранилище участников, права, wire-команды и передачи
+- `doc/group_avatar.txt` — подписанная аватарка канала, хранение и репликация
+- `doc/encrypted_attachments.md` — контейнер группового вложения, запросы ключа и ручная выдача доступа
+- `doc/pm_invites.md`, `doc/message_links.md` — приглашения из личной беседы и ссылки внутри сообщений
+- `doc/proxy_protocol.md` — TCP/UDP/ICMP-прокси, управление окнами, half-close и проверки
+- `doc/lwip_nuances.md` — особенности адаптированного lwIP TCP-стека
+- `doc/linux_audio_recovery.md` — диагностика аудиотракта Linux, контракты владения и восстановление устройств
+- `src/media_delivery/file_transfer.h`, `src/dm/dm_media.h` — контракты передачи файлов и E2E-вложений DM
+- `src/call/call_audio.h`, `src/radio/radio_audio.h` — API общего голосового стека и правила потоков
+- `tools/chatcli_commands.txt` — команды headless CLI, в том числе DM, звонки и рация

 ## Список задач по проекту

-Список задач — `/doc/tasks.md` (текущая работа, берём по одной задаче сверху).
+Список задач — `doc/tasks.md` относительно корня репозитория (текущая работа, берём по одной задаче сверху).
 При нахождении попутных багов/fail/флаков тестов добавляем задачу (либо фиксим сразу если баг простой).
 Как сделали - помечаем [+] выполнено.

@@ -734,18 +1015,47 @@ void lottie_animation_destroy(Lottie_Animation *anim);

 **Расположение:** `tools/chatgui-android/`

-Android-версия чатгуи — P2P чат на STCP (TCP), UI на Jetpack Compose (Kotlin).
-C-ядро: `libutun_lite` (выборочная компиляция нужных .c из `lib/` и `src/`).
+Android-версия чатгуи — P2P чат на общем ETCP/STCP-ядре, UI на Jetpack Compose (Kotlin).
+C-библиотека `utun_lite` собирает `lib/` и `src/` по `libutun_lite/utun_sources.cmake`;
+`instance_lite` запускает ядро и чат в отдельном потоке, без UTUN-сервиса.
 Сборка: CMake (headless, Linux) + Gradle/NDK (Android APK).
 - 'fw' - собрать и обновить chatgui-android на всех подключенных телефонах (clean + сборка + install)

 **Подробная инструкция:** `tools/chatgui-android/AGENTS.md`
 **Chat-модули:** все файлы из `src/chat/` (описаны выше в секции «Chat») компилируются в `libutun_lite`.

+### Основные файлы native-слоя
+
+Пути относительны к `tools/chatgui-android/`; UI и Android-сервисы описаны в локальном `AGENTS.md`.
+
+| Файл | Назначение |
+|------|-----------|
+| `libutun_lite/utun_sources.cmake` | Общий список исходников ядра для Android и headless |
+| `libutun_lite/CMakeLists.txt` | Сборка native-библиотеки и зависимостей |
+| `libutun_lite/instance_lite.c/h` | Запуск ядра/чата по INI-тексту и управление отдельным uasync-потоком |
+| `libutun_lite/utun_config_api.c/h` | Провайдер конфигурации: callbacks Kotlin и значения для native-слоя |
+| `libutun_lite/standby.c/h` | Фоновый duty-cycle, таймеры активных интервалов и ожидание пробуждения |
+| `libutun_lite/invite_link_c.c/h` | Старая копия C-кодека; .c исключён из UTUN_SOURCES, рабочий код — src/chat/invite_link.c/h |
+| `libutun_lite/attachment_sender.c/h` | Отправка файлов в канал через chat_msg_submit и канальный медиа-индекс |
+| `libutun_lite/photo_sender.c/h` | Отправка фотографий в канал с MIME-типом и размерами изображения |
+| `libutun_lite/video_sender.c/h` | Отправка видео через общий механизм подготовки вложений |
+| `libutun_lite/voice_recorder.c/h` | Накопление PCM записи, компрессор и отправка голоса через общий attachment_send |
+| `libutun_lite/stream_bridge.c/h` | Android-мост к publisher/viewers: session IDs, готовые access units/Opus и ограниченные батчи треков |
+| `jni_bridge/android_jni_bridge.c/h` | JNI-команды и callbacks между Kotlin и C-ядром, события и аудио API |
+| `jni_bridge/android_call_output_jni.c` | Вывод PCM звонка через AAudio с аппаратным тактированием и снимками позиции устройства |
+| `jni_bridge/android_call_video_jni.c` | JNI видеозвонка: capabilities/формат, обмен кадрами с call_video_port, playout и поворот YUV |
+| `jni_bridge/android_stream_jni.c` | JNI трансляций: publisher/viewer API, Opus/SoundTouch, готовый PCM и часы воспроизведения |
+| `jni_bridge/android_udp_log.c/h` | Потокобезопасный буфер UDP-логов с flush-таймером в потоке ядра |
+| `headless/headless_main.c` | Отдельный каркас control-loop; сам не запускает ядро/чат |
+| `headless/headless_control.c/h` | Каркас control-сокета; часть команд — заглушки, рабочий API — src/chat/chat_headless_control.c/h |
+| `app/src/main/cpp/CMakeLists.txt` | NDK-сборка библиотеки приложения |
+| `libutun_lite/tests/test_standby.c` | Проверка duty-cycle и жизненного цикла standby |
+
 ## Runtime
- Запуск utun от root (для tun): `/home/vnc1/proj/utun3/utun_start.sh`
- Стоп utun: `sudo /home/vnc1/proj/utun3/utun_stop1.sh`
- Логи: `utun.log` (stdout), `utun_err.log` (stderr)
+- После autotools-сборки бинарник — `src/utun`. Запуск из корня с TUN: `sudo ./src/utun -f -c utun.cfg`.
+- Старый `utun_start.sh` ожидает `./utun` в корне. `utun_stop.sh` делает `killall -9 utun`, а не штатную остановку одного экземпляра.
+- `-f` оставляет процесс на переднем плане; остановка — SIGINT/SIGTERM. Пути конфигурации, PID и лога задаются через `-c`, `-p`, `-l`.
+- `utun_start.sh` перенаправляет stdout в `utun.log`, stderr в `utun_err.log`.
 - Тестовые логи: `tests/logs/`

 ## Git Conventions
@@ -756,19 +1066,19 @@ C-ядро: `libutun_lite` (выборочная компиляция нужны

 ## Quick Start for New Features
 1. Add new source file to `src/Makefile.am` under `utun_SOURCES`
-2. Add test file to `tests/Makefile.am` under `check_PROGRAMS`
+2. Add test target and its sources/dependencies to `tests/Makefile.am` under `check_PROGRAMS`
 3. Use existing patterns from similar modules
-5. Run `./check.sh` after changes
+4. Run `./check.sh` after changes
 5. Commit with descriptive message in appropriate language

 ## chatgui: отправка сообщений через xdotool

-1. **Запуск:** `setsid env DISPLAY=:1.0 QT_ACCESSIBILITY=1 ./chatgui & disown` (иначе SIGTERM убьёт процесс при таймауте bash)
-2. **Окно:** `0x4600006 "Chat"` (WM_CLASS "chatgui"), 900×600. Не путать с `0x4800001` (10×10, временное)
-3. **Фокус:** клик в область InputBar (x=400, y=570 относительно окна) перед вводом
-4. **Отправка:** `xdotool type --window WID "text"` + `xdotool key --window WID Return`
-5. **Проверка:** `sqlite3 chats.db "SELECT ... FROM msg_ch_GENERAL"` — сообщения в per-channel таблицах
-6. **MCP computer use** не видит chatgui — нужен `qt5-at-spi` bridge (нет в репах, ставить из исходников Qt)
+1. **Запуск:** из каталога сборки `setsid env QT_ACCESSIBILITY=1 ./vibechat & disown` с DISPLAY текущей X11-сессии.
+2. **Окно:** найти актуальный ID через `xdotool search --onlyvisible --class vibechat`; ID и размеры окна меняются между запусками.
+3. **Фокус:** активировать найденное окно и выбрать InputBar; координаты определять по текущему расположению интерфейса.
+4. **Отправка:** `xdotool type --window WID "text"` + `xdotool key --window WID Return`, где WID заменён найденным ID.
+5. **Проверка:** через `chats.db` из каталога `db_path`; таблицы сообщений называются `msg_<числовой channel_id>`.
+6. Доступность UI-автоматизации зависит от текущей X11/Wayland-сессии и настроек Qt accessibility; старые ID окон и DISPLAY не переносить.

 ---
 Эта инструкция имеет приоритет над инструкцией opencode.
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="ua.cn.stu.navigation">
+
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"
+        tools:ignore="CoarseFineLocation" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Navigation">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:screenOrientation="portrait"
+            tools:ignore="LockedOrientationActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <service
+            android:name=".ble.BluetoothLeService"
+            android:enabled="true" />
+    </application>
+
+</manifest>
@@ -0,0 +1,99 @@
+
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+# Sets the minimum version of CMake required to build the native library.
+
+cmake_minimum_required(VERSION 3.18.1)
+
+# Declares and names the project.
+
+project("bt_drv")
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+
+add_library( # Sets the name of the library.
+             bt_drv
+
+             # Sets the library as a shared library.
+             SHARED
+
+             # Provides a relative path to your source file(s).
+        bt_drv.c
+        ble_tcp.c
+        ble_eth.c
+        eth_mem.c
+        eth_router.c
+        eth_nat.c
+        eth_queue.c
+        xlib.c
+        settings.c
+        images.c
+
+
+#        LWIP
+#        lwip/api/api_lib.c
+#//        lwip/api/api_msg.c
+#//        lwip/api/err.c
+#//        lwip/api/if_api.c
+#//        lwip/api/tcpip.c
+        lwip/dnsproxy.c
+        lwip/dhcp_server.c
+        lwip/net_raw.c
+        lwip/net_topology.c
+        lwip/lwip.c
+        lwip/eth_router_if_lwip.c
+        lwip/core/def.c
+        lwip/core/inet_chksum.c
+        lwip/core/init.c
+        lwip/core/ip.c
+        lwip/core/mem.c
+        lwip/core/memp.c
+        lwip/core/netif.c
+        lwip/core/pbuf.c
+        lwip/core/raw.c
+        lwip/core/stats.c
+        lwip/core/sys.c
+        lwip/core/tcp.c
+        lwip/core/tcp_in.c
+        lwip/core/tcp_out.c
+        lwip/core/timeouts.c
+        lwip/core/udp.c
+        lwip/core/ipv4/icmp.c
+        lwip/core/ipv4/ip4.c
+        lwip/core/ipv4/ip4_addr.c
+        lwip/core/ipv4/ip4_frag.c
+        lwip/core/ipv4/etharp.c
+        lwip/netif/ethernet.c
+        )
+include_directories(
+        .
+        lwip
+        lwip/include
+)
+# Searches for a specified prebuilt library and stores the path as a
+# variable. Because CMake includes system libraries in the search path by
+# default, you only need to specify the name of the public NDK library
+# you want to add. CMake verifies that the library exists before
+# completing its build.
+
+find_library( # Sets the name of the path variable.
+              log-lib
+
+              # Specifies the name of the NDK library that
+              # you want CMake to locate.
+              log )
+
+# Specifies libraries CMake should link to your target library. You
+# can link multiple libraries, such as libraries you define in this
+# build script, prebuilt third-party libraries, or system libraries.
+
+target_link_libraries( # Specifies the target library.
+                       bt_drv
+
+                       # Links the target library to the log library
+                       # included in the NDK.
+                       ${log-lib} )
@@ -0,0 +1,190 @@
+#include <stdint.h>
+#include <string.h>
+#include <pthread.h>
+#include "xlib.h"
+#include "ble_eth.h"
+#include "eth_mem.h"
+#include "eth_router.h"
+#include "ble_tcp.h"
+
+//#define BLE_FLOOD_TEST
+// модуль разобрки-сборки кодограмм на фрагменты. Работает вместе с ble_tcp и с ble_link
+
+/* Формат посылки:
+Кодограмма разбиватеся на куски. К каждому куску в начале добавляется один байт.
+Формат байта: байт0 биты 6,7 - тип посылки. Биты 0-5 будут перезаписаны при передаче.
+  bit7:6 - тип кодограммы:
+  00 (0x00) - промежуточный блок кодограммы
+  01 (0x40) - первый блок кодограммы
+  10 (0x80) - последний блок кодограммы
+  11 (0xC0) - вся кодограмма в одном фрагменте
+*/
+
+struct BLE_ETH_STATS ble_eth_stats;
+
+static struct ETH_PBUF* current_tx_block=NULL;
+static uint8_t eth_rst_req_rx;
+static uint8_t tx_rst=0;
+
+void gatt_eth_reset() {
+  eth_rst_req_rx=1;
+  tx_rst=1;
+  }
+
+static struct ETH_PBUF* rx_pbuf=NULL;
+static uint16_t rx_ptr;
+
+static uint8_t rx_prev_seq;
+static uint8_t rx_seq_err;
+
+int process_dgram_asm(uint8_t* data, uint16_t len) {// BLE to ETH_router
+
+  ble_eth_stats.rx_chunks++;
+  if (len<2) { ble_eth_stats.rx_too_short_chunk++; return 0; }
+
+//  if (eth_netif_array[BLE_NETIF_ID].input_queue_len>IN_BLE_NETIF_QLEN_THR) { ble_eth_stats.rx_qpause++; return -1; }// очередь заполнена, временно не принимаем новое (loopback test mode)
+// если очередь полная, то приостановим поток
+
+  if (eth_rst_req_rx) {
+    eth_rst_req_rx=0;
+    if (rx_pbuf) {
+      eth_pbuf_free_request(rx_pbuf);
+      rx_pbuf=NULL;
+      }
+    rx_ptr=0;
+    }
+
+  uint8_t dg_type=data[0]&0x0C0;
+  uint8_t dg_seq=data[0]&0x03F;
+  if (dg_type & 0x40) {// first block
+    rx_ptr=0;
+    rx_seq_err=0;
+    rx_prev_seq=(dg_seq-1)&0x03F;
+    if (rx_pbuf==NULL) rx_pbuf=eth_pbuf_alloc(&xeth_pbuf_ctrl, NULL);
+    if (rx_pbuf==NULL) { ble_eth_stats.rx_pbuf_alloc_err++; return -1; }
+    }
+  if (rx_pbuf!=NULL) {
+    rx_prev_seq=(rx_prev_seq+1)&0x3F;
+    if (rx_prev_seq!=dg_seq || rx_seq_err) {
+      ble_eth_stats.rx_seqerr++;
+      eth_pbuf_free_request(rx_pbuf);
+      rx_pbuf=NULL;
+      return 0;
+    }
+    len--;
+    if (rx_ptr+len<=ETH_MEM_BUF_SIZE) {
+      memcpy((uint8_t*)rx_pbuf->pbuf.payload+rx_ptr, data+1, len);
+      rx_ptr+=len;
+      if (dg_type & 0x080) {// last block
+        rx_pbuf->pbuf.len=rx_ptr;
+        rx_pbuf->pbuf.tot_len=rx_ptr;
+        rx_pbuf->pbuf.if_idx=BLE_NETIF_ID;
+        if (rx_ptr>=14) { ble_eth_stats.rx_dgrams++; eth_add_packet_to_router_queue(rx_pbuf); }
+        else { ble_eth_stats.rx_too_short_dgram++; eth_pbuf_free_request(rx_pbuf); }
+        rx_pbuf=NULL;
+        }
+      }
+    else {// invalid block
+      ble_eth_stats.rx_oversize++;
+      eth_pbuf_free_request(rx_pbuf);
+      rx_pbuf=NULL;
+      }
+    }
+  return 0;
+  }
+
+
+
+#define MAX_CHUNK_LEN 167//239
+static uint16_t chunk_len;// for BLE - current chunk length
+static uint16_t tx_ptr;// pointer for chunks
+
+static int cbk_pending=0;
+int get_next_chunk(uint8_t* chunk_for_tx) {// взять новый блок. Или NULL если блока нет (если блока нет - будет вызван коллбэк)
+
+  if (tx_rst) {
+    tx_rst=0;
+    tx_ptr=0;
+  }
+
+#ifdef BLE_FLOOD_TEST
+  ble_eth_stats.tx_chunks++;
+  chunk_for_tx[0]=0xC0;
+  return 240;// for test
+#endif
+  if (cbk_pending) return 0;
+  if (current_tx_block==NULL) {
+      cbk_pending=1;
+      struct ETH_PBUF* tb=eth_get_packet(&eth_netif_array[BLE_NETIF_ID]);
+      if (tb==NULL) {
+        return 0;// waiting for callback
+        } else { current_tx_block=tb; cbk_pending=0; }
+
+      }
+
+  uint8_t pkt_sent;// 0 - no data; 1 - send in progress, 2 - send finished
+  int32_t len=current_tx_block->pbuf.len-tx_ptr;
+  if (tx_ptr==0) chunk_for_tx[1]=0x40; else chunk_for_tx[1]=0;
+  if (len>MAX_CHUNK_LEN) { len=MAX_CHUNK_LEN; pkt_sent=0; } else { chunk_for_tx[1]|=0x80; pkt_sent=1; }
+  chunk_len=len+2;
+  memcpy(&chunk_for_tx[2], (uint8_t*)(current_tx_block->pbuf.payload)+tx_ptr, len);
+  tx_ptr+=len;
+
+  if (pkt_sent) {// последний блок скопирован в chunk_for_tx. пакат можно освобождать
+    ble_eth_stats.tx_dgrams++;
+    eth_pbuf_free_request(current_tx_block);
+    current_tx_block=NULL;
+    tx_ptr=0;
+    }
+
+  ble_eth_stats.tx_chunks++;
+  return chunk_len;
+  }
+
+void next_chunk_avail();
+
+static void callback_from_bridge(struct ETH_PBUF* block, struct ETH_NETIF* enetif) {// появился пакет на передачу
+  current_tx_block=block;
+  cbk_pending=0;
+  next_chunk_avail();
+  }
+
+void ble_callback_qlen(struct ETH_NETIF* netif) {
+  if (netif->input_queue_len<IN_BLE_NETIF_QLEN_THR) {// обновилась очередь в роутере - позволяет забрать пакет
+    notify_ble_out_queue();
+    }
+  }
+
+_Noreturn void tcp_test_Task(void * arg) {
+  while(1) {
+    struct ETH_PBUF* block=eth_pbuf_alloc(&xeth_pbuf_ctrl, NULL);
+    if (block) {
+      memset(block->pbuf.payload, 0,1000);
+      char* d=(char*)block->pbuf.payload;
+      d[0]=1;
+      d[1]=2;
+      d[2]=3;
+      d[3]=4;
+      d[4]=5;
+      d[5]=6;
+
+      block->pbuf.len=230;
+      block->pbuf.tot_len=230;
+      block->pbuf.if_idx=LWIP_NETIF_ID;
+      eth_add_packet_to_router_queue(block);
+      }
+    usleep(1000*500);
+    }
+  }
+pthread_t ttHandle;
+
+void eth_ble_if_init() {
+  eth_netif_array[BLE_NETIF_ID].callback_fn=callback_from_bridge;// инициализируем callback (пакет готов)
+  eth_netif_array[BLE_NETIF_ID].q_output_len_max=BLE_NETIF_QLEN;
+  eth_netif_array[BLE_NETIF_ID].q_update_cbk=ble_callback_qlen;
+  eth_netif_array[BLE_NETIF_ID].if_up=1;
+//  TaskCreate (tcp_test_Task, &ttHandle);
+
+  eth_netif_array[TEST_NETIF_ID].q_output_len_max=BLE_NETIF_QLEN;
+  eth_netif_array[TEST_NETIF_ID].if_up=1;
+  }
@@ -0,0 +1,29 @@
+#pragma once
+#include <stdint.h>
+#define MAX_CHUNK_LEN 167
+
+struct BLE_ETH_STATS {
+    uint32_t tx_chunks;
+    uint32_t rx_chunks;
+    uint32_t tx_dgrams;
+    uint32_t rx_dgrams;
+
+    uint32_t rx_too_short_chunk;
+    uint32_t rx_too_short_dgram;
+    uint32_t rx_oversize;
+    uint32_t rx_pbuf_alloc_err;
+    uint32_t rx_qpause;
+    uint32_t rx_seqerr;
+
+    uint32_t d1;
+    uint32_t d2;
+    uint32_t d3;
+    uint32_t d4;
+};
+
+extern struct BLE_ETH_STATS ble_eth_stats;
+
+int get_next_chunk(uint8_t* chunk_for_tx);
+int process_dgram_asm(uint8_t* data, uint16_t len);
+void eth_ble_if_init();
+void gatt_eth_reset();
@@ -0,0 +1,196 @@
+#include <jni.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <string.h>
+#include "ble_tcp.h"
+#include "xlib.h"
+#include "bt_drv.h"
+#include "eth_mem.h"
+#include "eth_router.h"
+#include "ble_eth.h"
+// модуль обеспечивающий ретрансмиссии, буферизацию, контроль потока для GATT посылок.
+#define ACK_MIN_INTERVAL 25// mS. на эту величину может задерживаться отправка ACK
+//#define print_pkt_body
+
+static uint32_t last_ack_time;
+static uint8_t ack_sent_value;
+static uint8_t snd_blk_len;
+static uint8_t snd_blk[MAX_CHUNK_LEN+2];
+
+static struct itimerspec trigger;
+static timer_t timerid;
+static uint8_t ack_notify_request;
+
+#define TMR_CHECK_TXBUF_PERIOD 100
+
+//static TimerHandle_t xTcpTimer;
+static struct NHandle_t tNotifyHandle;
+pthread_t tHandle;
+pthread_t tHandle1;
+
+sem_t tcp_tx_sem;
+sem_t tcp_rx_sem;
+
+#define TX_LOCK sem_wait(&tcp_tx_sem)
+#define TX_UNLOCK sem_post(&tcp_tx_sem)
+#define RX_LOCK sem_wait(&tcp_rx_sem)
+#define RX_UNLOCK sem_post(&tcp_rx_sem)
+
+#define taskNOTIFY_ACK_UPDATE 1// очередь передачи
+#define taskNOTIFY_NEXT_CHUNK_AVAIL 2
+#define taskNOTIFY_NEXT_CHUNK_FOR_TX_AVAIL 4
+#define taskNOTIFY_BLE_TX_COMPLETE 8
+#define taskNOTIFY_nACK_UPDATE 16// приемная очередь
+#define taskNOTIFY_TMR_IDLE 64
+#define taskNOTIFY_PUSH_RECVD 256
+
+struct BLE_TCP_STATS ble_tcp_stats;
+struct BLE_TCP ble_tcp;
+
+
+uint8_t tx_index_blk;// ячейка ожидающая передачу
+uint8_t tx_push_ptr_blk;// ячейка ожидающая добавление элемента
+static uint32_t tx_last_time;// ячейка ожидающая добавление элемента
+
+
+uint8_t rx_nack_blk;// циклический номер блока, ожидающего приём
+
+void gatt_conn_reset() {
+  TX_LOCK;
+  RX_LOCK;
+  ble_tcp.ble_tx_busy=0;
+  ble_tcp_stats.rst_cnt++;
+  rx_nack_blk=1;
+  tx_index_blk=0;
+  tx_push_ptr_blk=0;
+  snd_blk_len=0;
+  gatt_eth_reset();
+  TNotifyAdd( &tNotifyHandle, taskNOTIFY_BLE_TX_COMPLETE);
+  RX_UNLOCK;
+  TX_UNLOCK;
+  }
+
+void notify_ble_out_queue() {// callback: обновилась очередь ETH / ble_if
+  TNotifyAdd(&tNotifyHandle, taskNOTIFY_PUSH_RECVD);
+  }
+
+void process_gatt_data(uint8_t* data, uint16_t len) {
+  ble_tcp_stats.rx_raw++;
+  if (len<1) { ble_tcp_stats.rx_empty_dg++; return; }
+  ble_tcp_stats.rx_bytes+=len;
+#ifdef print_pkt_body
+  if (len==1) print_log("Recv %d bytes [%02x]", len, data[0]);
+  else print_log("Recv %d bytes [%02x %02x]", len, data[0], data[1]);
+#endif
+  TX_LOCK;
+  rx_nack_blk=data[0]&0x3F;
+  TNotifyAdd( &tNotifyHandle, taskNOTIFY_nACK_UPDATE );
+  TX_UNLOCK;
+
+  if (len>1) {
+    RX_LOCK;
+    process_dgram_asm(data+1, len-1);
+    RX_UNLOCK;
+  }
+}
+
+
+void next_chunk_avail() {
+  TNotifyAdd( &tNotifyHandle, taskNOTIFY_NEXT_CHUNK_AVAIL );
+  }
+
+void ble_tx_complete(int status) {
+  ble_tcp.ble_tx_busy=0;
+  TNotifyAdd( &tNotifyHandle, taskNOTIFY_BLE_TX_COMPLETE );// ззавершена передача. можно затолкать в буфер передачи еще
+  }
+
+static int ble_gatt_trysend(uint8_t * data, uint16_t len) {
+  if (ble_connection_status!=2) return -3;// not ready for send
+  if (ble_tcp.ble_tx_busy) return -1;
+  ble_tcp.ble_tx_busy=1;
+  int ret=bt_send(data, len);// status: 1 - all ok, 0 - error
+  if (ret!=1) { ble_tcp.ble_tx_busy=0; return -2; }
+  ble_tcp_stats.tx_raw++;
+
+#ifdef print_pkt_body
+  if (len==1) print_log("Send %d bytes [%02x]", len, data[0]);
+  else print_log("Send %d bytes [%02x %02x]", len, data[0], data[1]);
+#endif
+
+  return 0;
+  }
+
+// байт 1 (или 1+2) - rx ack / sack
+_Noreturn void BLE_TCP_Task(void * arg) {
+
+  send_thread_register();// зарегистрировать в java VM этот поток для возможности совершать вызовы
+
+  while (1) {
+    uint32_t res=TNotifyWait( &tNotifyHandle );
+
+// попробуем передать что накопилось
+    if ((res & (taskNOTIFY_BLE_TX_COMPLETE | taskNOTIFY_NEXT_CHUNK_AVAIL | taskNOTIFY_nACK_UPDATE | taskNOTIFY_TMR_IDLE)) && ble_tcp.ble_tx_busy==0) {
+dbg[0]++;
+      TX_LOCK;
+
+      int idx=tx_index_blk;
+      int len=snd_blk_len;
+      if (len==0) {
+        len=get_next_chunk(&snd_blk[0]);
+        snd_blk_len=len;
+      }
+
+
+
+      if (len || (ack_notify_request && ack_sent_value!=rx_nack_blk )) {// шлем если есть что слать, либо пора отправить обновление по ACK
+        uint32_t ack=rx_nack_blk;
+
+        snd_blk[0]=ack;
+        if (len==0) len=1;
+        else snd_blk[1]=(idx&0x3F)|(snd_blk[1] & 0xC0);// сохраняем биты признака начала-конца кодограммы для разобрщика кодограмм
+// 167 = 5 (800) *9=1503 (169 bytes max incl. headers)
+        int ret=ble_gatt_trysend(&snd_blk[0], len);// ack + dgram
+        if (ret==0) {
+          snd_blk_len=0;
+          ble_tcp_stats.tx_bytes+=len;
+          ble_tcp_stats.tx_blocks++;
+          ack_sent_value=ack;
+          ack_notify_request=0;
+          timer_settime(timerid, 0, &trigger, NULL);
+          tx_index_blk=(idx+1)&0x3F;
+        }
+      }
+
+      TX_UNLOCK;
+      }
+
+    }
+  }
+
+static void tcp_tmr( void* arg ) {
+  TX_LOCK;
+  ack_notify_request=1;
+  TX_UNLOCK;
+  TNotifyAdd( &tNotifyHandle, taskNOTIFY_TMR_IDLE);// no activity. for timed-out retransmit
+}
+
+void ble_tcp_init() {
+  sem_init(&tcp_tx_sem, 0, 1);
+  sem_init(&tcp_rx_sem, 0, 1);
+
+  tx_last_time=xTaskGetTickCount();
+  TaskCreate (BLE_TCP_Task, &tHandle);
+  TNotifyCreate(&tNotifyHandle);
+  TNotifyAdd( &tNotifyHandle, taskNOTIFY_ACK_UPDATE);
+
+  struct sigevent sev;
+  memset(&sev, 0, sizeof(struct sigevent));
+  sev.sigev_notify = SIGEV_THREAD;
+  sev.sigev_notify_function = &tcp_tmr;
+  memset(&trigger, 0, sizeof(struct itimerspec));
+  timer_create(CLOCK_REALTIME, &sev, &timerid);
+  trigger.it_value.tv_sec = ACK_MIN_INTERVAL/1000000;
+  trigger.it_value.tv_nsec = ACK_MIN_INTERVAL*1000000;
+  timer_settime(timerid, 0, &trigger, NULL);
+
+  }
@@ -0,0 +1,57 @@
+struct BLE_TCP_STATS {
+  uint32_t tx_raw;
+  uint32_t rx_raw;
+  uint32_t tx_blocks;
+  uint32_t rx_blocks;
+  uint32_t tx_err;
+  uint32_t tx_ack_err;
+  uint32_t tx_sack_err;
+  uint32_t tx_ack_negdist_err;
+  uint32_t tx_ack_toomuch_err;
+
+  uint32_t ack_upd;
+  uint32_t rx_empty_dg;
+  uint32_t rx_only_ack;
+  uint32_t rx_seq_err;
+  uint32_t rx_dup_ack;
+  uint32_t rx_neg_ack;
+  uint32_t rx_duplicates;
+  uint32_t rx_detected_retransmit_jumps;
+  uint32_t rx_detected_packet_loss_single;
+  uint32_t rx_detected_packet_loss_multiple;
+  uint32_t rx_detected_incorrect_jumps;
+
+  uint32_t rst_cnt;
+  uint32_t rstreq_cnt;
+  uint32_t rxasm_throttle;
+  uint32_t rxasm_try;
+  uint32_t tx_bytes;
+  uint32_t rx_bytes;
+  uint32_t d1;
+  uint32_t d2;
+  uint32_t d3;
+  uint32_t d4;
+  };
+extern struct BLE_TCP_STATS ble_tcp_stats;
+
+struct BLE_TCP {
+  uint32_t ble_tx_busy;
+  };
+extern struct BLE_TCP ble_tcp;
+
+
+extern uint8_t tx_busy_mask[8];
+extern uint8_t rx_ready_mask[8];
+extern uint8_t rx_nack_blk;
+extern uint8_t rx_last_recvd_blk;
+
+extern uint8_t tx_ack_blk;// следующая после подтвержденной ячейка (т.е. начиная с которой надо передавать)
+extern uint8_t tx_index_blk;// ячейка ожидающая передачу
+extern uint8_t tx_push_ptr_blk;// ячейка ожидающая добавление элемента
+
+void ble_tcp_init();
+
+void notify_ble_out_queue();// 
+void ble_tx_complete(int status);
+void process_gatt_data(uint8_t* data, uint16_t len);
+void gatt_conn_reset();
@@ -0,0 +1,355 @@
+#include <jni.h>
+#include "bt_drv.h"
+#include <stdio.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <string.h>
+#include <sched.h>
+#include <semaphore.h>
+#include <stdatomic.h>
+#include "xlib.h"
+#include "ble_tcp.h"
+#include "eth_mem.h"
+#include "eth_router.h"
+#include "ble_eth.h"
+#include "lwip/lwip.h"
+#include "eth_nat.h"
+#include "lwip/net_topology.h"
+//#include "lwip/opt.h"
+//#include "lwip/mem.h"
+//#include "lwip/memp.h"
+//#include "lwip/netif.h"
+//#include "lwip/init.h"
+
+int dbg_scr_num=0;
+
+// ====================================== startup =========================
+JavaVM* gJvm = NULL;
+jobject bleservice;
+jclass bleserv;
+jclass bleserv1;
+JNIEnv* send_env;
+JNIEnv* status_upd_env;
+
+jmethodID send_method;
+jmethodID frame_method;
+jmethodID status_upd_method;
+
+volatile int ble_connection_status=0;// 2 - connection up.
+
+int bt_send(uint8_t* dgr, uint16_t dglen) {
+    dbg[3]++;
+
+
+    JNIEnv *env=send_env;
+    jbyteArray dgram=(*env)->NewByteArray(env, dglen);
+    if (dgram == NULL) return -1;
+    (*env)->SetByteArrayRegion (env, dgram, 0, dglen, dgr);
+
+//    jbyteArray bytes = (*env)->GetObjectField(env, obj, sendId)
+//    jbyte *stateJava = (*env)->GetByteArrayElements(env, dgram, NULL);
+//    if (stateJava == NULL) return -1;
+//    memcpy(stateJava, dgr, dglen);
+    int ret=-1;
+    if (send_method) ret=(*env)->CallStaticIntMethod(env, bleserv, send_method, dgram);
+    (*env)->DeleteLocalRef(env, dgram);
+
+//    print_log("[BLE] send dgram %d", ret);
+    return ret;
+}
+jbyteArray jname;
+jbyteArray jval;
+
+static void status_upd(int p, char* name, char* val) {
+    JNIEnv *env=status_upd_env;
+    jbyteArray jname=(*env)->NewByteArray(env, strlen(name));
+    if (jname == NULL) return;
+    (*env)->SetByteArrayRegion (env, jname, 0, strlen(name), name);
+    jbyteArray jval=(*env)->NewByteArray(env, strlen(val));
+    if (jval == NULL) return;
+    (*env)->SetByteArrayRegion (env, jval, 0, strlen(val), val);
+    if (status_upd_method) (*env)->CallStaticVoidMethod(env, bleserv1, status_upd_method, p, jname, jval);
+    (*env)->DeleteLocalRef(env, jname);
+    (*env)->DeleteLocalRef(env, jval);
+}
+
+void status_upd_thread_register() {
+    JavaVMAttachArgs args;
+    args.version = JNI_VERSION_1_6; // choose your JNI version
+    args.name = NULL;
+    args.group = NULL;
+    jint ret=(*gJvm)->AttachCurrentThread(gJvm, &status_upd_env, &args);
+    if (ret) return;
+}
+
+void send_thread_register() {
+    JavaVMAttachArgs args;
+    args.version = JNI_VERSION_1_6; // choose your JNI version
+    args.name = NULL;
+    args.group = NULL;
+    jint ret=(*gJvm)->AttachCurrentThread(gJvm, &send_env, &args);
+    if (ret) return;
+}
+
+void status_upd1(int i, char* b, uint32_t c) {
+    char str[100];
+    sprintf(str, "%d",c);
+    status_upd(i, b, str);
+}
+
+
+uint32_t tx_hist[16];
+uint32_t rx_hist[16];
+uint32_t htime[16];
+uint8_t histptr;
+
+
+pthread_t thr;
+_Noreturn void status_thread(void* arg) {
+    status_upd_thread_register();
+    while(1) {
+        int p=histptr&15;
+        tx_hist[p]=ble_tcp_stats.tx_bytes;
+        rx_hist[p]=ble_tcp_stats.rx_bytes;
+        htime[p]=xTaskGetTickCount();
+        int tx_spd=(tx_hist[p]-tx_hist[(p-10)&15])*1000/(htime[p]-htime[(p-10)&15]);
+        int rx_spd=(rx_hist[p]-rx_hist[(p-10)&15])*1000/(htime[p]-htime[(p-10)&15]);
+        p++;
+        histptr=p&15;
+        dbg[1]=(dbg[1]+1)%170;
+
+        int i = 1;
+        if (dbg_scr_num==0) {
+            status_upd1(i++, "dbg[0]", dbg[0]);
+            status_upd1(i++, "dbg[1]", dbg[1]);
+            status_upd1(i++, "dbg[2]", dbg[2]);
+            status_upd1(i++, "dbg[3]", dbg[3]);
+            status_upd1(i++, "dbg[4]", dbg[4]);
+            status_upd1(i++, "dbg[5]", dbg[5]);
+            status_upd1(i++, "dbg[6]", dbg[6]);
+            status_upd1(i++, "dbg[7]", dbg[7]);
+            status_upd1(i++, "dbg[8]", dbg[8]);
+            status_upd1(i++, "dbg[9]", dbg[9]);
+            status_upd1(i++, "dbg[10]", dbg[10]);
+
+            status_upd1(i++, "tx_chunks", ble_eth_stats.tx_chunks);
+            status_upd1(i++, "rx_chunks", ble_eth_stats.rx_chunks);
+            status_upd1(i++, "tx_dgrams", ble_eth_stats.tx_dgrams);
+            status_upd1(i++, "rx_dgrams", ble_eth_stats.rx_dgrams);
+            status_upd1(i++, "rx_qpause", ble_eth_stats.rx_qpause);
+            status_upd1(i++, "rx_seqerr", ble_eth_stats.rx_seqerr);
+
+            status_upd1(i++, "tx_spd", tx_spd);
+            status_upd1(i++, "rx_spd", rx_spd);
+
+        }
+        if (dbg_scr_num==1) {
+            status_upd1(i++, "ble_conn_status", ble_connection_status);
+            status_upd1(i++, "BLEif_dg_in", eth_netif_array[BLE_NETIF_ID].dgrams_in);
+            status_upd1(i++, "BLEif_dg_lost", eth_netif_array[BLE_NETIF_ID].dgrams_lost);
+            status_upd1(i++, "BLEif_dg_out", eth_netif_array[BLE_NETIF_ID].dgrams_out);
+            status_upd1(i++, "BLEif_dg_outqlen", eth_netif_array[BLE_NETIF_ID].q_output_len);
+            status_upd1(i++, "BLEif_dg_in_qlen", eth_netif_array[BLE_NETIF_ID].input_queue_len);
+            status_upd1(i++, "BLEif_cbk_p", eth_netif_array[BLE_NETIF_ID].callback_pending);
+
+            status_upd(i++, "", "");
+            status_upd1(i++, "LWif_dg_in", eth_netif_array[LWIP_NETIF_ID].dgrams_in);
+            status_upd1(i++, "LWif_dg_lost", eth_netif_array[LWIP_NETIF_ID].dgrams_lost);
+            status_upd1(i++, "LWif_dg_out", eth_netif_array[LWIP_NETIF_ID].dgrams_out);
+            status_upd1(i++, "LWif_dg_outqlen", eth_netif_array[LWIP_NETIF_ID].q_output_len);
+            status_upd1(i++, "LWif_dg_in_qlen", eth_netif_array[LWIP_NETIF_ID].input_queue_len);
+            status_upd1(i++, "LWif_cbk_p", eth_netif_array[LWIP_NETIF_ID].callback_pending);
+
+            status_upd(i++, "", "");
+            status_upd1(i++, "NAT_pbuf_brk", nat_stat.pbuf_broken);
+            status_upd1(i++, "NAT_tcp_new", nat_stat.tcp_new);
+            status_upd1(i++, "NAT_tcp_close", nat_stat.tcp_close);
+
+            status_upd(i++, "", "");
+            status_upd1(i++, "eth_pbuf used", xeth_pbuf_ctrl.used);
+            status_upd1(i++, "eth_queue used", xeth_queuepool_ctrl.used);
+            status_upd1(i++, "nat pbuf used", nat_stat.pbuf_used);
+            status_upd1(i++, "nat lw conn used", nat_stat.lw_conn_used);
+
+        }
+        if (dbg_scr_num==2) {
+            status_upd1(i++, "tx_raw", ble_tcp_stats.tx_raw);
+            status_upd1(i++, "rx_raw", ble_tcp_stats.rx_raw);
+            status_upd1(i++, "tx_blocks", ble_tcp_stats.tx_blocks);
+            status_upd1(i++, "rx_blocks", ble_tcp_stats.rx_blocks);
+            status_upd1(i++, "tx_err", ble_tcp_stats.tx_err);
+            status_upd1(i++, "tx_ack_err", ble_tcp_stats.tx_ack_err);
+            status_upd1(i++, "tx_sack_err", ble_tcp_stats.tx_sack_err);
+//            status_upd1(i++, "tx_ack_negd_err", ble_tcp_stats.tx_ack_negdist_err);
+//            status_upd1(i++, "tx_ack_toom_err", ble_tcp_stats.tx_ack_toomuch_err);
+//            status_upd1(i++, "ack_upd", ble_tcp_stats.ack_upd);
+//            status_upd1(i++, "rx_empty_dg", ble_tcp_stats.rx_empty_dg);
+//            status_upd1(i++, "rx_only_ack", ble_tcp_stats.rx_only_ack);
+            status_upd1(i++, "rx_seq_err", ble_tcp_stats.rx_seq_err);
+//            status_upd1(i++, "rx_dup_ack", ble_tcp_stats.rx_dup_ack);
+//            status_upd1(i++, "rx_neg_ack", ble_tcp_stats.rx_neg_ack);
+            status_upd1(i++, "rx_duplicates", ble_tcp_stats.rx_duplicates);
+            status_upd1(i++, "rx_rtr_jmps", ble_tcp_stats.rx_detected_retransmit_jumps);
+//            status_upd1(i++, "rx_pl1", ble_tcp_stats.rx_detected_packet_loss_single);
+//            status_upd1(i++, "rx_pl2+", ble_tcp_stats.rx_detected_packet_loss_multiple);
+            status_upd1(i++, "rx_incor_jmps", ble_tcp_stats.rx_detected_incorrect_jumps);
+            char b[100]; int ptr=0;
+//            for (int i=0; i<8; i++) ptr+=sprintf(b+ptr, "%d ",tx_busy_mask[i]);
+            status_upd(i++, "tx_busy_mask", b);
+//            status_upd1(i++, "tx_ack_blk", tx_ack_blk);
+            status_upd1(i++, "tx_index_blk", tx_index_blk);
+            status_upd1(i++, "tx_push_ptr_blk", tx_push_ptr_blk);
+            ptr=0;
+//            for (int i=0; i<8; i++) ptr+=sprintf(b+ptr, "%d ",rx_ready_mask[i]);
+            status_upd(i++, "rx_ready_mask", b);
+            status_upd1(i++, "rx_nack_blk", rx_nack_blk);
+//            status_upd1(i++, "rx_last_rcvd_blk", rx_last_recvd_blk);
+            status_upd1(i++, "conn_rst", ble_tcp_stats.rst_cnt);
+            status_upd1(i++, "conn_rst_req", ble_tcp_stats.rstreq_cnt);
+            status_upd1(i++, "ble_tx_busy", ble_tcp.ble_tx_busy);
+            status_upd1(i++, "rxasm_try", ble_tcp_stats.rxasm_try);
+            status_upd1(i++, "rxasm_throttle", ble_tcp_stats.rxasm_throttle);
+
+        }
+        while (i<=30) status_upd(i++, "", "");
+        usleep(100000);
+    }
+}
+
+JNIEXPORT void JNICALL
+Java_ua_cn_stu_navigation_MainActivity_change_1dbg_1scr(JNIEnv *env, jobject thiz, jint scr) {
+  dbg_scr_num=scr;
+}
+
+pthread_t frameThreadHandle;
+extern uint8_t imageCubes[];
+extern uint8_t imageWolf[];
+JNIEnv* frame_env;
+
+void frameThread(void *argsw)
+{
+    JavaVMAttachArgs args;
+    args.version = JNI_VERSION_1_6; // choose your JNI version
+    args.name = NULL;
+    args.group = NULL;
+    jint ret=(*gJvm)->AttachCurrentThread(gJvm, &frame_env, &args);
+    if (ret) return;
+    static unsigned char parity;
+    while(1)
+    {
+        usleep(50000);
+        if (frame_method)
+        {
+            JNIEnv *env = frame_env;
+            jbyteArray dgramm = (*env)->NewByteArray(env, 132 * 8);
+            if (dgramm == NULL) continue;
+            (*env)->SetByteArrayRegion (env, dgramm, 0, 132 * 8, ! parity ? imageWolf : imageCubes);
+            (*env)->CallStaticVoidMethod(env, bleserv, frame_method, dgramm);
+            (*env)->DeleteLocalRef(env, dgramm);
+            parity = !parity;
+        }
+    }
+}
+
+void frameThreadInit()
+{
+    TaskCreate (frameThread, &frameThreadHandle);
+}
+
+JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* pjvm, void* reserved) {
+    gJvm = pjvm;
+    JNIEnv* env;
+    if ((*pjvm)->GetEnv(pjvm, &env, JNI_VERSION_1_6) != JNI_OK) {return JNI_ERR;}
+
+    bleserv = (*env)->NewGlobalRef(env, (*env)->FindClass(env, "ua/cn/stu/navigation/MainActivity"));
+    if (bleserv == NULL) return JNI_ERR;
+    bleserv1 = (*env)->NewGlobalRef(env, (*env)->FindClass(env, "ua/cn/stu/navigation/MainActivity"));
+    if (bleserv1 == NULL) return JNI_ERR;
+    send_method = (*env)->GetStaticMethodID(env, bleserv, "send_to_ble","([B)I");
+    if (send_method == NULL) return JNI_ERR;
+    frame_method = (*env)->GetStaticMethodID(env, bleserv, "frame", "([B)V");
+    if (frame_method == NULL) return JNI_ERR;
+    status_upd_method = (*env)->GetStaticMethodID(env, bleserv, "upd_status_param","(I[B[B)V");
+    if (status_upd_method == NULL) return JNI_ERR;
+
+    TaskCreate(status_thread, &thr);
+    eth_router_init();
+    eth_ble_if_init();
+    ble_tcp_init();
+
+    MX_LWIP_Init();
+    topology_init();
+    frameThreadInit();
+    return JNI_VERSION_1_6;
+}
+
+//JNIEXPORT void JNICALL Java_ua_cn_stu_navigation_MainActivity_char_1wr_1cbk(JNIEnv *env, jobject thiz, jint status) {
+//    ble_tx_complete(status);
+//}
+JNIEXPORT void JNICALL
+Java_ua_cn_stu_navigation_ble_BluetoothLeService_char_1wr_1cbk(JNIEnv *env, jclass clazz,
+                                                               jint status) {
+    ble_tx_complete(status);
+}
+
+JNIEXPORT void JNICALL
+Java_ua_cn_stu_navigation_MainActivity_new_1dg_1from_1bt(JNIEnv *env, jobject thiz, jbyteArray jdgram) {
+    dbg[4]++;
+
+    jbyte *stateJava = (*env)->GetByteArrayElements(env, jdgram, NULL);
+    if (stateJava == NULL) return ;
+    jint len = (*env)->GetArrayLength(env, jdgram);
+    if (len>0) process_gatt_data(stateJava, len);
+//    int pid=getpid();
+//    int ppid=getppid();
+//    int tid = gettid();
+//    print_log("tid %d pid %d ppid %d recvd %d bytes",tid, pid, ppid, len);
+    (*env)->ReleaseByteArrayElements(env, jdgram, stateJava, 0);
+}
+
+JNIEXPORT void JNICALL
+Java_ua_cn_stu_navigation_MainActivity_eth_1ble_1stack_1control(JNIEnv *env, jobject thiz,
+                                                                jint status) {
+// status:
+// 0 - service started
+// 1 - service shutdown request
+// 2 - ble connection up
+// 3 - ble connection down
+    ble_connection_status=status;
+    if (status==2) gatt_conn_reset();
+}
+
+
+JNIEXPORT void JNICALL
+Java_ua_cn_stu_navigation_MainActivity_tap_1detected(JNIEnv *env, jobject thiz, jint area) {
+    //    tap_detected(area);
+    dbg[2]++;
+}
+
+JNIEXPORT void JNICALL
+Java_ua_cn_stu_navigation_MainActivity_coord_1from_1terminal(JNIEnv *env, jobject thiz, jint x_pix,
+                                                             jint y_pix) {
+    static volatile char x;
+    x++;
+    // TODO: implement coord_from_terminal()
+}
+
+JNIEXPORT void JNICALL
+Java_ua_cn_stu_navigation_MainActivity_button_1from_1terminal(JNIEnv *env, jobject thiz,
+                                                              jint button_id) {
+    volatile int lol = button_id;
+    // TODO: implement button_from_terminal()
+}
+
+//JNIEXPORT void JNICALL Java_ua_cn_stu_navigation_MainActivity_eth_1ble_1stack_1control(JNIEnv *env, jobject thiz, jint status) {
+//// status:
+//// 0 - service started
+//// 1 - service shutdown request
+//// 2 - ble connection up
+//// 3 - ble connection down
+//  ble_connection_status=status;
+//  if (status==2) gatt_conn_reset();
+//}
@@ -0,0 +1,9 @@
+#ifndef TESTBLE_BT_DRV_H
+#define TESTBLE_BT_DRV_H
+
+#include <jni.h>
+
+int bt_send(uint8_t* dgr, uint16_t dglen);
+void send_thread_register();
+extern volatile int ble_connection_status;
+#endif //TESTBLE_BT_DRV_H
@@ -0,0 +1,377 @@
+// ETH_MEM ver 1.0
+
+#include "xlib.h"
+#include <string.h>
+#include <pthread.h>
+#include <semaphore.h>
+
+#include "eth_mem.h"
+#include "eth_router.h"
+
+sem_t eth_mem_sem;
+
+// ============ task for queue management
+struct ETH_MEM_STATS eth_mem_stats;
+
+// private function prototypes
+static void EthQueueTask(void *argument);
+static void eth_custom_pbuf_free_request(struct pbuf* p);
+
+#define taskNOTIFY_NEW_FREE_P_REQUEST 1// освобождение элемента очереди
+#define taskNOTIFY_NEW_P_REQUEST 4// дефицит pbuf
+#define taskNOTIFY_ROUTER_Q_UPDATE 16// толкнуть обработчик очередей (роутер)
+// ref увеличивается только в главном пакете из цепочки.
+inline static struct ETH_PBUF* do_eth_pbuf_alloc(struct ETH_PBUF_CTRL* eth_pbuf_ctrl, struct NOMEM_CALLBACK* cb) {
+
+  struct ETH_PBUF* p=(struct ETH_PBUF*)eth_pbuf_ctrl->free_chain;
+  if (p==NULL) {// no memory
+    if (cb) {
+      if (cb->wait_active) return NULL;
+      eth_mem_stats.eth_pbuf_alloc_delayed++;
+      if (eth_mem_stats.eth_pbuf_alloc_delayed==2) {}
+      cb->next_p=NULL;
+      struct NOMEM_CALLBACK* nopbuf_queue_prev=(struct NOMEM_CALLBACK*)eth_pbuf_ctrl->pool->nopbuf_q_end;
+      if (nopbuf_queue_prev) nopbuf_queue_prev->next_p=cb; else eth_pbuf_ctrl->pool->nopbuf_q_begin=cb;
+      eth_pbuf_ctrl->pool->nopbuf_q_end=cb;
+      cb->wait_active=1;
+      }
+    else eth_mem_stats.eth_pbuf_alloc_fails++;
+    return NULL;
+    }
+  eth_pbuf_ctrl->free_chain=(struct ETH_PBUF*)p->pbuf.next;
+  eth_pbuf_ctrl->used++;
+  if (eth_pbuf_ctrl->used>eth_pbuf_ctrl->used_max) eth_pbuf_ctrl->used_max=eth_pbuf_ctrl->used;
+  p->pbuf.next=NULL;
+  int pbuf_num=(p-&eth_pbuf[0]);
+  return p;
+  }
+
+struct ETH_PBUF* eth_pbuf_alloc(struct ETH_PBUF_CTRL* eth_pbuf_ctrl, struct NOMEM_CALLBACK* cb) {
+  ETH_MEM_DECL_PROTECT();
+  ETH_MEM_PROTECT();
+  struct ETH_PBUF* p=do_eth_pbuf_alloc(eth_pbuf_ctrl, cb);
+  ETH_MEM_UNPROTECT();
+  if (cb) {
+    if (p==NULL) {
+      TNotifyAdd(&eth_pbuf_ctrl->pool->tNotifyHandle, taskNOTIFY_NEW_P_REQUEST);
+      return NULL;
+      }
+    p->pbuf.if_idx = cb->src_interface_id;
+    }
+  else p->pbuf.if_idx=0;
+
+  p->pbuf.ref=1;
+  p->pbuf.type_internal=0;// payload directly follows the struct pbuf
+  p->pbuf.flags=PBUF_FLAG_IS_CUSTOM;// bufer have custom free function
+  p->pbuf.payload=p->default_payload;
+
+  return p;
+  }
+
+
+static struct ETH_QUEUEPOOL_CTRL* xpool;
+// добавить мост. выделяем пул для пакетных буферов моста, память для интерфейсов
+void eth_router_add_bridge(struct ETH_QUEUEPOOL_CTRL* pool, struct ETH_QUEUE* eth_q, uint32_t pool_mem_size_blocks,
+                           struct ETH_PBUF_CTRL* eth_pbuf_ctrl, struct ETH_PBUF* eth_pbuf, uint8_t* eth_pbuf_mem, uint32_t eth_pbufs_cnt,
+                           struct ETH_NETIF* netif_arr, uint32_t netif_count) {
+
+// pbufs init
+
+  eth_pbuf_ctrl->free_chain=eth_pbuf;
+  eth_pbuf_ctrl->pool=pool;
+
+  for (int i=0; i<eth_pbufs_cnt; i++) {// initialize all PBUFs
+    eth_pbuf[i].default_payload=&eth_pbuf_mem[i*ETH_MEM_BUF_SIZE];// link PBUF with memory chunk (in separate space)
+    eth_pbuf[i].pbuf.type_internal=0;// payload directly follows the struct pbuf
+    eth_pbuf[i].pbuf.flags=PBUF_FLAG_IS_CUSTOM;// bufer have custom free function
+    eth_pbuf[i].pbuf.ref=0;// reference count (1 - first allocate)
+    eth_pbuf[i].pbuf.if_idx=0;// network interface index (0 = no index)
+    eth_pbuf[i].src_if=0;// network interface index (0 = no index)
+    eth_pbuf[i].custom_free_function=&eth_custom_pbuf_free_request;// pointer to custom free function
+    eth_pbuf[i].ctrl=eth_pbuf_ctrl;// link for fast navigate to PBUF control structure
+    }
+  for (int i=0; i<eth_pbufs_cnt-1; i++) {// chain all PBUFs (allocation in future get PBUF from this chain)
+    eth_pbuf[i].pbuf.next=(struct pbuf*)&eth_pbuf[i+1];
+    }
+  eth_pbuf[eth_pbufs_cnt-1].pbuf.next=NULL;
+
+
+// pool init
+
+  for (int i=0; i<pool_mem_size_blocks-1; i++) eth_q[i].next=&eth_q[i+1];// chain all free queue control structs for future allocation
+  eth_q[pool_mem_size_blocks-1].next=NULL;// нужно только в случае переинициализации пула
+  pool->used=0;// выделено блоков (статистика)
+  pool->used_max=0;// пик выделения (статистика)
+  pool->q_begin=eth_q;
+  pool->eth_netif_array=netif_arr;
+  pool->eth_netif_size=netif_count;
+
+  for (int i=0; i<netif_count; i++) {
+    netif_arr[i].q_output_end=NULL;
+    netif_arr[i].q_output_begin=NULL;
+    netif_arr[i].q_output_len=0;
+    netif_arr[i].q_output_len_max=0;
+    netif_arr[i].q_output_size=1;
+    netif_arr[i].callback_fn=NULL;
+    netif_arr[i].q_update_cbk=NULL;
+    netif_arr[i].pool=pool;
+    netif_arr[i].eth_netif_id=i;
+    netif_arr[i].if_up=0;
+    netif_arr[i].callback_pending=0;
+    }
+
+
+  for (int i=0; i<pool_mem_size_blocks; i++) {// проинициализируем заранее поля буферов один раз, чтобы не обновлять при каждой аллокации
+    eth_q[i].state=st_free;
+    eth_q[i].pool=pool;
+    }
+  xpool=pool;
+  }
+
+
+void eth_router_start_task(struct ETH_QUEUEPOOL_CTRL* pool) {
+  sem_init(&eth_mem_sem, 0, 1);
+  TNotifyCreate(&pool->tNotifyHandle);
+  TaskCreate (EthQueueTask, &pool->pThr);
+  }
+
+
+static void eth_custom_pbuf_free_request(struct pbuf* p) {// callback from LWIP pbuf
+  p->ref=1;// lwip уже декрементировал ref. Чтобы нам корректно освободить, нужно ref вернуть.
+  eth_pbuf_free_request((struct ETH_PBUF*)p);
+  }
+
+void eth_pbuf_free_request(struct ETH_PBUF* xpbuf) {// добавлене в очередь на освобождение блока (или передачу другому владельцу)
+  struct ETH_QUEUEPOOL_CTRL* pool=xpbuf->ctrl->pool;
+  ETH_MEM_DECL_PROTECT();
+  ETH_MEM_PROTECT();
+  if (xpbuf->pbuf.ref>1) {
+    xpbuf->pbuf.ref--;
+    ETH_MEM_UNPROTECT();
+    return;
+    }
+  if (xpbuf->pbuf.ref==0) EM_ASSERT(1);// already free?
+
+  int pbuf_num=(xpbuf-&eth_pbuf[0]);
+
+  xpbuf->pbuf.next=NULL;//this pbuf must be last in chain
+  if (pool->free_pbuf_q_end) {// pbuf is not empty
+    if (pool->free_pbuf_q_end->pbuf.next) EM_ASSERT(2);// ASSERT: invalid pointer to last pbuf. last pbuf not marked as last in chain
+    pool->free_pbuf_q_end->pbuf.next=&xpbuf->pbuf;// add to end of chain
+    } else pool->free_pbuf_q_begin=xpbuf;
+  pool->free_pbuf_q_end=xpbuf;
+  ETH_MEM_UNPROTECT();
+  TNotifyAdd(&pool->tNotifyHandle, taskNOTIFY_NEW_FREE_P_REQUEST);
+  }
+
+static void free_blk(struct ETH_QUEUEPOOL_CTRL* pool) {// освободим блоки из очереди на освобождение
+      while (1) {
+// взятие освобождаемого ETH_PBUF из очереди
+        struct ETH_PBUF* xpbuf=(struct ETH_PBUF*)pool->free_pbuf_q_begin;// pbuf в начале очереди
+        if (xpbuf==NULL) { /*ETH_MEM_UNPROTECT();*/ break; }
+        if (xpbuf->pbuf.ref!=1) EM_ASSERT(3);// ASSERT: invalid allocation counter
+        int src_if=xpbuf->src_if;
+        xpbuf->src_if=0;
+        ETH_MEM_DECL_PROTECT();
+        ETH_MEM_PROTECT();
+        pool->eth_netif_array[src_if].input_queue_len--;
+        struct ETH_PBUF* n=(struct ETH_PBUF*)xpbuf->pbuf.next;// кто следующий в очереди
+        pool->free_pbuf_q_begin=n;// продвигаем очередь
+        if (n==NULL) pool->free_pbuf_q_end=NULL;// если очередь пуста
+// действие с освобождаемым ETH_PBUF (освобождение или передача)
+        if (pool->nopbuf_q_begin) {// pass memory to new owner directly
+          struct NOMEM_CALLBACK* cb=(struct NOMEM_CALLBACK*)pool->nopbuf_q_begin;
+          pool->nopbuf_q_begin=cb->next_p;
+          if (pool->nopbuf_q_begin==NULL) pool->nopbuf_q_end=NULL;
+          cb->wait_active=0;
+          ETH_MEM_UNPROTECT();
+          cb->next_p=NULL;// на всякий случай, в принципе это не нужно
+          eth_mem_stats.eth_pbuf_alloc_delay_cbks++;
+          xpbuf->pbuf.if_idx = cb->src_interface_id;
+          cb->callback_fn(xpbuf, cb);// нужно выделить только pbuf
+          }
+        else {// free memory
+          xpbuf->pbuf.next=(struct pbuf*)xpbuf->ctrl->free_chain;// освобождаемый блок добавляем в начало очереди
+          xpbuf->ctrl->free_chain=xpbuf;
+          xpbuf->pbuf.ref=0;// для порядка. в продакшене не требуется
+          if (xpbuf->ctrl->used==0) EM_ASSERT(4);
+          xpbuf->ctrl->used--;
+          ETH_MEM_UNPROTECT();
+          }
+        if (pool->eth_netif_array[src_if].q_update_cbk) pool->eth_netif_array[src_if].q_update_cbk(&pool->eth_netif_array[src_if]);// вызовем callback, что очередь стала меньше
+        }
+  }
+
+// Процесс, обслуживающий:
+// - очередь запросов на освобождение памяти
+// - очередь коллбэков на выделение памяти (тем кто в очереди на получение памяти при дефиците памяти)
+// - очередь пакетов на роутинг
+static void EthQueueTask(void* arg) {
+  struct ETH_QUEUEPOOL_CTRL* pool=xpool;
+  while (1) {
+    uint32_t res=TNotifyWait(&pool->tNotifyHandle);
+
+    if (res & taskNOTIFY_NEW_FREE_P_REQUEST) {// new pbuf_free requests
+      free_blk(pool);
+      }
+    if (res & taskNOTIFY_ROUTER_Q_UPDATE) {// new dgram in queue
+      while (1) {
+        ETH_MEM_DECL_PROTECT();
+        ETH_MEM_PROTECT();
+        struct ETH_QUEUE* queue=(struct ETH_QUEUE*)pool->q_input_begin;
+        if (queue==NULL) { ETH_MEM_UNPROTECT(); break; }
+        struct ETH_QUEUE* n=queue->next;
+        pool->q_input_begin=n;// забираем из очереди
+        if (n==NULL) pool->q_input_end=NULL;
+        queue->next=NULL;
+        pool->q_input_used--;
+        ETH_MEM_UNPROTECT();
+        eth_route_block(queue);// и отдаём в роутинг
+        if (pool->free_pbuf_q_begin) free_blk(pool);
+        }
+      }
+    }
+
+  }
+
+// Выделить блок памяти.
+inline static struct ETH_QUEUE* do_eth_queue_entry_alloc(struct ETH_QUEUEPOOL_CTRL* pool) {
+  struct ETH_QUEUE* queue = (struct ETH_QUEUE*)pool->q_begin;// try to allocate queue
+  if (queue==NULL) {
+    pool->alloc_fails++;
+    eth_mem_stats.qpool_alloc_fails++;
+    return NULL;
+    }
+  pool->q_begin = queue->next;// update pointer to next free queue
+  pool->used++;
+  if (pool->used_max < pool->used) pool->used_max = pool->used;
+  queue->state = st_allocated;
+  return queue;// allocated memory
+  }
+
+static struct ETH_QUEUE* eth_queue_entry_alloc(struct ETH_QUEUEPOOL_CTRL* pool) {
+  ETH_MEM_DECL_PROTECT();
+  ETH_MEM_PROTECT();
+  struct ETH_QUEUE* q=do_eth_queue_entry_alloc(pool);
+  ETH_MEM_UNPROTECT();
+  return q;
+  }
+
+void eth_queue_entry_free(struct ETH_QUEUE* queue) {// освобождение элемента очереди
+  struct ETH_QUEUEPOOL_CTRL* pool=queue->pool;
+  if (queue->state==st_free) EM_ASSERT(5);// ASSERT: trying to free not used queue
+  ETH_MEM_DECL_PROTECT();
+  ETH_MEM_PROTECT();
+  queue->state=st_free;
+  queue->next=(struct ETH_QUEUE*)pool->q_begin;// освобождаемый блок добавляем в начало очереди
+  pool->q_begin=queue;
+  pool->used--;
+  ETH_MEM_UNPROTECT();
+  }
+
+#pragma optimize=none
+void eth_add_packet_to_router_queue(struct ETH_PBUF* xpbuf) {
+  uint32_t nif=xpbuf->pbuf.if_idx;
+  if (xpbuf->pbuf.ref==0) EM_ASSERT(11);
+  if (nif>=ETH_NETIFS) EM_ASSERT(6);//
+  xpbuf->src_if=nif;
+  if (xpbuf->pbuf.len<14) {// invalid datagram. 14 bytes (src mac+dst mac + ethertype) required
+    eth_pbuf_free_request(xpbuf);
+    ETH_MEM_DECL_PROTECT();
+    ETH_MEM_PROTECT();
+    xpbuf->ctrl->pool->eth_netif_array[nif].dgrams_lost++;
+    ETH_MEM_UNPROTECT();
+    return;
+    }
+  struct ETH_QUEUEPOOL_CTRL* pool=xpbuf->ctrl->pool;
+  struct ETH_QUEUE* queue=eth_queue_entry_alloc(pool);
+  if (queue==NULL) {
+    eth_pbuf_free_request(xpbuf);
+    ETH_MEM_DECL_PROTECT();
+    ETH_MEM_PROTECT();
+    pool->eth_netif_array[nif].dgrams_lost++;
+    ETH_MEM_UNPROTECT();
+    return;
+    }
+  queue->next = NULL;
+  queue->state = st_in_queue;
+  queue->pbuf = xpbuf;
+  ETH_MEM_DECL_PROTECT();
+  ETH_MEM_PROTECT();
+  pool->eth_netif_array[nif].input_queue_len++;
+  pool->eth_netif_array[nif].dgrams_in++;
+  if (pool->q_input_end!=NULL) pool->q_input_end->next=queue; else pool->q_input_begin=queue;
+  pool->q_input_end=queue;
+  pool->q_input_used++;
+  if (pool->q_input_used_max<pool->q_input_used) pool->q_input_used_max=pool->q_input_used;
+
+  ETH_MEM_UNPROTECT();
+  TNotifyAdd(&pool->tNotifyHandle, taskNOTIFY_ROUTER_Q_UPDATE);
+  }
+
+struct ETH_PBUF* eth_get_packet(struct ETH_NETIF* enetif) {// запрос пакета из исходящей очереди драйвером для передачи во внешний мир
+  ETH_MEM_DECL_PROTECT();
+  ETH_MEM_PROTECT();
+  struct ETH_QUEUE* queue=(struct ETH_QUEUE*)enetif->q_output_begin;
+  if (queue) {// packet ready
+    struct ETH_QUEUE* next_queue=queue->next;
+    enetif->q_output_begin=next_queue;
+    if (next_queue == NULL) enetif->q_output_end = NULL;
+    if (enetif->q_output_len==0) EM_ASSERT(7);// ASSERT: сбой подсчета размера очереди.
+    enetif->q_output_len--;
+    enetif->dgrams_out++;
+    ETH_MEM_UNPROTECT();
+    queue->next=NULL;
+    queue->state=st_sending;
+    struct ETH_PBUF* xpbuf=queue->pbuf;
+    eth_queue_entry_free(queue);
+    return xpbuf;
+    }
+  if (enetif->callback_fn) enetif->callback_pending=1;
+  ETH_MEM_UNPROTECT();
+  return NULL;
+  }
+
+void eth_add_packet_to_output_queue(struct ETH_QUEUE* queue, struct ETH_NETIF* enetif) {// для роутера. отправить в исходящую очередь нужного интерфейса (или передать сразу драйверу, если он ждёт пакет)
+  queue->next = NULL;
+  if (queue->pbuf->pbuf.ref==0) EM_ASSERT(8);
+  ETH_MEM_DECL_PROTECT();
+  ETH_MEM_PROTECT();
+  if (enetif->callback_pending) {// интерфейс ожидает блок - отправляем сразу в интерфейс без очереди
+    if (enetif->q_output_end) EM_ASSERT(9);// assert: драйвер ждёт пакет, но в очереди почему-то что-то есть. Хотя должно быть пусто...
+    enetif->callback_pending=0;
+    queue->state = st_sending;
+    enetif->dgrams_out++;
+    ETH_MEM_UNPROTECT();
+    struct ETH_PBUF* xpbuf=queue->pbuf;
+    eth_queue_entry_free(queue);
+    if (enetif->callback_fn) enetif->callback_fn(xpbuf, enetif);
+    else EM_ASSERT(10);// no callback
+    return;
+    }
+  if (enetif->q_output_len>=enetif->q_output_len_max) {// очередь уже полна. дропаем пакет.
+    enetif->dgrams_lost++;
+    ETH_MEM_UNPROTECT();
+    eth_pbuf_free_request(queue->pbuf);
+    eth_queue_entry_free(queue);
+    return;
+    }
+  queue->state = st_in_queue;// добавляем в очередь
+  if (enetif->q_output_end) enetif->q_output_end->next=queue; else enetif->q_output_begin=queue;// этот элемент приписываем к концу очереди
+  enetif->q_output_end=queue;// конечным элементом ставим этот элемент
+  enetif->q_output_len++;
+  if (enetif->q_output_len_max<enetif->q_output_len) enetif->q_output_len_max=enetif->q_output_len;
+  ETH_MEM_UNPROTECT();
+  }
+
+struct ETH_QUEUE* eth_mem_clone(struct ETH_QUEUE* queue) {
+  struct ETH_QUEUE* queue_copy=eth_queue_entry_alloc(queue->pool);
+  if (queue_copy) {
+    queue_copy->pbuf=queue->pbuf;
+    ETH_MEM_DECL_PROTECT();
+    ETH_MEM_PROTECT();
+    queue->pbuf->pbuf.ref++;
+    ETH_MEM_UNPROTECT();
+    }
+  return queue_copy;
+  }
@@ -0,0 +1,234 @@
+#pragma once
+
+#include <semaphore.h>
+#include "xlib.h"
+#include "eth_router_cfg.h"
+#include "lwip/pbuf.h"
+
+/* Менеджер памяти и очередей для ethernet пакетов.
+Умеет:
+- выделять и освобождать память из пулов (пока пул один, но архитектурно заложена возможность использования нескольких пулов)
+- при ошибке выделения памяти вызвать callback как только память появилась (т.е. как только кто-то освободил)
+- работать с очередями: помещать пакеты из всех интерфейсов в общую очередь на роутинг (из irq или потока)
+Менеджер содержит в себе поток, обслуживающий нужды очереди менеджера памяти и очередь на роутинг. Из этого потока вызываются все коллбэки.
+Коллбэки могут заниматься среднезатратными по времени вещами (например, копирование всего пакета или подсчет CRC всего пакета), но не могут вставать в ожидание чего-либо.
+Ожидание коллбэков будет тормозить обработку входящих очередей с интерфейсов и очереди на операции с памятью.
+
+Роутер из очереди на роутинг распихивает пакеты в интерфейсы назначения. Если при попытке запихнуть пакет в интерфейс назначения размер очередь этого интерфейса заполнена, пакет отбрасывается.
+Для броадкастов роутером создаются копии пакета на каждый исходящий интерфейс. Ибо нужно каждую копию запихнуть в свою очередь, а очередь у пакета только одна.
+Рекомендуемый размер входящих очередей - 2 пакета: один в процессе приёма, второй в потоке роутера.
+Пакеты во входящих очередях обрабатываются сразу (как это позволть сделать приоритет потока обработчика).
+Размер исходящих очередей должен быть больше, его задача удерживать в буферах всё что вовремя не пролезает через медленные интерфейсы.
+Пока пакет не фрагментируется. Всё что не влезает в размер одного буфера (ETH_MEM_BUF_SIZE), отбрасывается.
+
+
+Рекомендации по драйверам интерфейсов:
+- при инициализации:
+eth_netif_array[YOUR_NETIF_ID].q_output_len_max=<размер очереди на передачу в пакетах>
+eth_netif_array[YOUR_NETIF_ID].callback_fn=lwip_callback_from_bridge;// инициализируем callback (пакет готов)
+eth_netif_array[ETH_NETIF_ID].if_up=1;// интерфейс готов принимать пакеты
+
+
+- выделить память из пула перед приёмом пакета (т.е. буфера резервируются когда инициализируются буфера приёма), и записывать пакет сразу в эту память.
+- если при инициализации буфера был отказ в выделении памяти, ждать коллбэк. Когда прилетит callback, можно инициализировать буфер и запускать приём.
+
+Передача:
+1. инициализируем callback на новый пакет.
+2. запрашиваем пакет (eth_get_packet). Функция либо возвратит что есть в очереди, либо активирует коллбэк. В этом случае ждем пакет.
+3. когда пакет получен, передаем пакет
+4. повторяем начиная с пп.2
+Обработчик коллбэка вызывается один раз после того как eth_get_packet вернул NULL (т.е. отсутствие пакета)
+*/
+
+// параметры инициализации пула по умолчанию:
+extern sem_t eth_mem_sem;
+
+
+#define ETH_MEM_ALIGN __attribute__((aligned(4)))// для CPU без кеша
+
+#define ETH_MEM_DECL_PROTECT()  
+#define ETH_MEM_PROTECT()       {sem_wait(&eth_mem_sem); /*asm("DSB SY");*/}
+#define ETH_MEM_UNPROTECT()     {/*asm("DSB SY");*/ sem_post(&eth_mem_sem);}
+
+#define EM_ASSERT(x) {dbg[10]=x; while(1);}
+
+
+
+// ======================== Управляющие структуры =============
+struct ETH_PBUF_CTRL {
+  volatile struct ETH_PBUF* free_chain;// linked-list для размещения-освобождения буферов
+  volatile uint32_t used;// счетчик, сколько сейчас элементов занято
+  uint32_t used_max;// сколько было занято максимум
+  struct ETH_QUEUEPOOL_CTRL* pool;
+
+  };
+
+#ifndef PBUF_FLAG_IS_CUSTOM// cleck for LWIP pbuf is included
+#define PBUF_FLAG_IS_CUSTOM 0x02U
+
+struct pbuf {
+  struct pbuf *next; // next fragment in chain (NULL - end of packet)
+  void *payload;       // memory for packet payload
+  uint16_t tot_len;       // remain packet length from begin of this part
+  uint16_t len;           // this fragment length
+  uint8_t type_internal;  // payload directly follows the struct pbuf
+  uint8_t flags;          // PBUF_FLAG_IS_CUSTOM
+  uint8_t ref; // reference count
+  uint8_t if_idx;         // network interface index
+  };
+
+typedef void (*pbuf_free_custom_fn)(struct pbuf *p);
+#endif
+
+struct ETH_PBUF {
+  struct pbuf pbuf;
+   // struct pbuf:   *next // next fragment in chain (NULL - end of packet)
+   // void *payload;       // memory for packet payload
+   // u16_t tot_len;       // remain packet length from begin of this part
+   // u16_t len;           // this fragment length
+   // u8_t type_internal;  // payload directly follows the struct pbuf
+   // u8_t flags;          // PBUF_FLAG_IS_CUSTOM
+   // LWIP_PBUF_REF_T ref; // reference count
+   // u8_t if_idx;         // network interface index
+   // pbuf_free_custom_fn  // custom pbuf free function
+  pbuf_free_custom_fn custom_free_function;
+  uint8_t* default_payload;
+  uint8_t src_if;
+  struct ETH_PBUF_CTRL* ctrl;
+  };
+
+
+struct ETH_QUEUE {// ячейка пула
+  struct ETH_QUEUE* next;// указатель на следующий элемент списка (очереди, которая определяется параметром mia_state)
+  struct ETH_QUEUEPOOL_CTRL* pool;
+  struct ETH_PBUF* pbuf;// Обращаться к ETH_PBUF / pbuf нужно через этот указатель!
+  volatile enum {
+    st_free=0,// ячейка свободна, поле next указывает на следующую свободную ячейку, т.е. используется дл выделения памяти
+    st_allocated=1,// ячейка занята, идёт процесс записи данных в ячейку, поле next не используется
+    st_in_queue=2,// ячейка в очереди на обработку, поле next указывает на следующую ячейку в данной очереди
+    st_sending=3,// в процессе отправки на интерфейсе назначения
+    st_free_pending=4 } state;// ячейка в очереди на освобождение (или передачи другому ожидающему память владельцу), поле next указывает на следующий элемент очереди на совобождение
+  uint8_t dst_if_idx;// если 0 - то роутится роутером. Если не 0, то роутится в соответствующиё исходящий интерфейс
+  };
+
+struct ETH_MEM_STATS {
+  uint32_t qpool_alloc_fails;// queue entry alloc fail (summary, for all queues)
+  uint32_t eth_pbuf_alloc_fails;
+  uint32_t eth_pbuf_alloc_delayed;
+  uint32_t eth_pbuf_alloc_delay_cbks;
+  };
+
+extern struct ETH_MEM_STATS eth_mem_stats;
+
+struct NOMEM_CALLBACK {// структура для организации очереди коллбэков на выделение памяти для входящих пакетов, т.е. принимаемых драйвером (экземпляры структуры создаются интерфейсом)
+  void (*callback_fn)(struct ETH_PBUF*, struct NOMEM_CALLBACK*);
+  struct NOMEM_CALLBACK* next_p;// chain for pbuf allocation requests
+  struct ETH_PBUF* p;
+  uint8_t src_interface_id;
+  uint8_t wait_active;// Если в состоянии ожидания выдачи памяти - то =1
+  };
+
+struct ETH_NETIF {// сетевой интерфейс (элемент netif_list). определа в виде массива элементов заранее определенного размера, индекс является номером интерфейса и eth_netif_id.
+  volatile struct ETH_QUEUE* q_output_end;// сюда добавляем пакет после роутинга
+  volatile struct ETH_QUEUE* q_output_begin;// забираем пакет драйвером интерфейса
+  volatile uint32_t q_output_len; // размер исходящей очереди
+  volatile uint32_t q_output_len_max; // фиксируем пик очереди
+  volatile uint32_t q_output_size; // максимальный размер исходящей очереди. Количество элементов в пуле должно хватать для обслуживания всех очередей.
+// входящая очередь не лимитируется (предполагается, что пакет во входящей очереди не задерждится надолго и быстро улетит в исходящую, либо отбросится если исходящая очередь пепеполнена).
+
+  void (*callback_fn)(struct ETH_PBUF*, struct ETH_NETIF*);// callback готовности пакета на передачу драйверу
+  struct ETH_QUEUEPOOL_CTRL* pool;// пул памяти, использующийся этим интерфейсом
+  void (*q_update_cbk)(struct ETH_NETIF*);// callback уменьшения кол-ва пакетов в ожидании обработки от этого интерфейса
+  uint8_t eth_netif_id;// ID интерфейса. всегда является индексом eth_netif_array. сделан для ускорения определения индекса по указателю.
+  volatile uint8_t if_up;// интерфейс включен (если 0, то интерфейс не используется для передачи-приема пакетов)
+  volatile uint8_t callback_pending;// ждём callback
+  uint32_t dgrams_in;
+  uint32_t dgrams_out;
+  uint32_t dgrams_lost;
+  uint32_t input_queue_len;// размер очереди кодограмм от этого интерфейса
+  char* if_name;
+  };
+
+struct ETH_QUEUEPOOL_CTRL {// описание пула элементов для интерфейса моста
+  volatile struct ETH_QUEUE* q_begin;// начало списка свободных буферов. Сюда и добавляем освобождаемую память, и забираем при размещении (т.е. работает как стек)
+  volatile struct NOMEM_CALLBACK* nopbuf_q_end;// сюда добавляем / очередь желающих получить pbuf
+  volatile struct NOMEM_CALLBACK* nopbuf_q_begin;// отсюда забираем
+  volatile struct ETH_PBUF* free_pbuf_q_end;// добавляем - очередь запросов на освобождение блока
+  volatile struct ETH_PBUF* free_pbuf_q_begin;// забираем
+  volatile struct ETH_QUEUE* q_input_end;// добавляем - очередь входящих пакетов на роутинг
+  volatile struct ETH_QUEUE* q_input_begin;// забираем
+  volatile uint32_t q_input_used;// счетчик, сколько сейчас элементов входящей очереди занято
+  volatile uint32_t q_input_used_max;// пик
+  volatile uint32_t used;// счетчик, сколько сейчас элементов пула занято
+  uint32_t used_max;// сколько было занято максимум
+  volatile uint32_t alloc_fails;// счетчик ошибок выделения
+  struct ETH_NETIF* eth_netif_array;// массив структур описывающих подключенные сетевые интерфейсы
+  struct NHandle_t tNotifyHandle;// процесс, обслуживающий этот пул
+  pthread_t pThr;
+  uint8_t eth_netif_size;// количество элементов структуры eth_netif_array
+  };
+
+
+
+// ======================== API =============
+
+// проинициализировать мост:
+// - кастомный пул памяти (pool - управляющая структура, pool_mem - структура блоков памяти для пула, pool_mem_size_blocks - количество блоков памяти)
+// - пул очередей
+// не thread-safe. пул можно переинициализировать в любой момент. Пока не завершена (пере)инициализация нельзя пользоваться функциями работы с пулом.
+// т.е. сперва инициализируем пул, потом запускаем периферию интерфейсов.
+void eth_router_add_bridge(struct ETH_QUEUEPOOL_CTRL* pool, struct ETH_QUEUE* eth_q, uint32_t pool_mem_size_blocks,
+                           struct ETH_PBUF_CTRL* eth_pbuf_ctrl, struct ETH_PBUF* eth_pbuf, uint8_t* eth_pbuf_mem, uint32_t eth_pbufs_cnt,
+                           struct ETH_NETIF* netif_arr, uint32_t netif_count);
+
+void eth_router_start_task(struct ETH_QUEUEPOOL_CTRL* pool);
+
+// Внутренняя функция
+// выделить элемент очереди из пула pool (thread/irq safe, если настроено выше)
+//struct ETH_QUEUE* eth_queue_entry_alloc(struct ETH_QUEUEPOOL_CTRL* pool);
+
+// Функция для роутера
+// Освобождаем блок (thread/irq safe, если настроено выше).
+// Блок должен быть выделен из любого пула ETH_QUEUE.
+void eth_queue_entry_free(struct ETH_QUEUE* q);
+
+// Запрос пакета драйвером интерфейса из очереди (thread/irq safe, если настроено выше)
+// Если пакет есть в очереди на передачу, пакет извлекается из очереди и указатель на него возвращается функцией.
+// Драйвер должен передать пакет, затем освободить буфер.
+// Если в очереди пусто, функция возвращает NULL и инициирует ожидание пакета в очереди. Как только в очереди появится новый пакет, будет вызван callback, описанный в структуре enetif.
+// В вызове callback будет указатель на пакет и указатель на сетевой интерфейс.
+// в enetif предварительно надо проинициализировать:
+//   callback_fn - указатель на callback-функцию;
+struct ETH_PBUF* eth_get_packet(struct ETH_NETIF* enetif);
+
+// Функция для драйвера сетевого интерфейса
+// отправить принятый интерфейсом пакет в роутер (thread/irq safe, если настроено выше)
+// перед этим вызовом предполагается что память была выделена функцией eth_pbuf_alloc, пакет записан в память pbuf->payload и в pbuf->if_idx вписан номер интерфейса.
+// размер доступной памяти payload в байтах равен ETH_MEM_BUF_SIZE
+void eth_add_packet_to_router_queue(struct ETH_PBUF* pbuf);
+
+// Функция для роутера
+// отправить пакет "block" в очередь исходящую очередь интерфейса "enetif" (только из потока роутера).
+// либо если драйвер ждёт пакет, педедать его сразу, минуя очередь
+void eth_add_packet_to_output_queue(struct ETH_QUEUE* queue, struct ETH_NETIF* enetif);
+
+// Функция для роутера
+// дублирует пакет и создает новую очередь для пакета.
+// память пакета для всех копий общая. Поэтому изменеять содержимое пакета после клонирования нельзя.
+// используется для броадкастов (отправка копии пакета на все интерфйесы)
+struct ETH_QUEUE* eth_mem_clone(struct ETH_QUEUE* block);
+
+// выделяет pbuf. Если указан CB, то при ошибке выделения как только появится свободный ETH_PBUF, будет вызван callback с этим ETH_PBUF
+// Для активации CB нужен заранее проинициализированный экземпляр структуры callback.
+// Если предполагается очередь из нескольких callback-ов на отказ памяти, то для всех callback-ов, которые одновременно могут находиться в очереди, нужен отдельный экземпляр структуры.
+// Рекомендуется при первом отказе памяти перестать размещать новые блоки и дождаться callback-а. В коллбэке можно пытаться дальше выделять память до первой ошибки.
+// в cb предварительно надо проинициализировать:
+//   callback_fn - указатель на callback-функцию;
+//   src_interface_id - номер интерфейса (он проинициализируется в pbuf). Также можно использовать для определения экземпляра драйвера (если один обработчик на несколько интерфейсов)
+// Нумерация интерфейсов - от единицы. 0 означает "не проинициализировано". Драйвер должен установить корректно номер интерфейса, иначе будут проблемы с роутингом.
+// если cb=NULL, то номер интерфейса нужно будет проинициализировать самостоятельно после выделения блока.
+struct ETH_PBUF* eth_pbuf_alloc(struct ETH_PBUF_CTRL* eth_pbuf_ctrl, struct NOMEM_CALLBACK* cb);
+
+// Освобождаем блок (thread/irq safe, если настроено выше).
+// Блок должен быть выделен из любого пула ETH_PBUF.
+void eth_pbuf_free_request(struct ETH_PBUF* pbuf);
@@ -0,0 +1,489 @@
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include <strings.h>
+#include <errno.h>
+#include "lwip/opt.h"
+#include "lwip/tcp.h"
+#include "lwip/udp.h"
+#include "lwip/mem.h"
+#include "dnsproxy.h"
+#include "eth_router.h"
+#include "eth_queue.h"
+#include "lwip/lwip.h"
+#include "eth_nat.h"
+#include "linux/tcp.h"
+
+#define PROT_TCP 6
+#define PROT_UDP 17
+#define PROT_ICMP 1
+
+#define NAT_DIVERT_PORT 1234
+pthread_t tnatHandle;
+pthread_t tnatRXHandle;
+//static struct NHandle_t tNotifyHandle;
+#define taskNOTIFY_NEW_DATA 1
+
+
+// src ip:port / dst ip:port -> src ip/port / dst <- divert ip:port
+// В пакете подменяется dst ip:port, и в таблицу nat пишется соответствие src ip:port к dst ip:port
+
+struct NAT_TAB nattab[NAT_TAB_SIZE];
+
+struct NAT_STAT nat_stat;
+
+static int nat_task_pipe[2];
+static int nat_rx_task_pipe[2];
+
+
+_Noreturn static void calc_stats(void * arg) {
+while(1) {
+    int nofl_conn = 0;
+    for (int i = 0; i < NAT_TAB_SIZE; i++) {
+        int didx=nattab[i].index_end-nattab[i].index_begin;
+        if (didx<0) didx+=SNDQ_MAXLEN;
+        nofl_conn+=didx;
+//        if (nattab[i].index_begin != nattab[i].index_end) nofl_conn++;
+    }
+    nat_stat.lw_conn_used = nofl_conn;
+    usleep(10000);
+}
+}
+
+
+int forward_nat(struct ETH_QUEUE* block) {// пакет в интернет - заворачивается на локальный ip/port по таблице соответствий
+  struct ETH_PKT_HDR* pkt=(struct ETH_PKT_HDR*)block->pbuf->pbuf.payload;
+  if (pkt->ethertype!=htons(0x800)) return -1;// no match
+  if (pkt->ip_dst==0xffffffff) return -1;//broadcast
+  if ((gnetif.ip_addr.addr & gnetif.netmask.addr) == (pkt->ip_dst & gnetif.netmask.addr) ) return -1;// local dgram
+  if (pkt->proto!=PROT_TCP && pkt->proto!=PROT_UDP/* && pkt->proto!=PROT_ICMP*/) return -1;
+
+  uint32_t curtime=xTaskGetTickCount();
+
+  uint8_t* ip=&pkt->ip_src;
+  uint16_t port=htons(pkt->port_src);
+  uint8_t* dip=&pkt->ip_dst;
+  uint16_t dport=htons(pkt->port_dst);
+
+  int nat_entry=-1;
+  for (int i=0; i<NAT_TAB_SIZE; i++) {
+//    if (pkt->proto==PROT_TCP || pkt->proto==PROT_UDP) {
+      if (pkt->ip_src == nattab[i].src_ip &&
+          pkt->ip_dst==nattab[i].dst_ip &&
+          pkt->port_src==nattab[i].src_port &&
+          pkt->port_dst==nattab[i].dst_port &&
+          nattab[i].proto==pkt->proto ) { /*print_log("[NAT_TCP] Found match...");*/ nat_entry=i; break;}
+//    }
+  }
+  if (nat_entry==-1) {// find oldest entry
+    int oldent=0;
+    uint32_t maxtime=0;
+    for (int i=0; i<NAT_TAB_SIZE; i++) {
+        if (nattab[i].status) continue;// не трогаем не разорванные TCP соединения
+      if (curtime-nattab[i].time>maxtime) { maxtime=curtime-nattab[i].time; oldent=i; }
+    }
+    nat_entry=oldent;
+    nattab[nat_entry].src_ip=pkt->ip_src;
+    nattab[nat_entry].dst_ip=pkt->ip_dst;
+    nattab[nat_entry].src_port=pkt->port_src;
+    nattab[nat_entry].dst_port=pkt->port_dst;
+    nattab[nat_entry].proto=pkt->proto;
+  }
+  nattab[nat_entry].time=curtime;
+  pkt->ip_dst=gnetif.ip_addr.addr;
+  pkt->port_dst=htons(NAT_DIVERT_PORT);
+
+//  print_log("[NAT_TCP] === forward pkt from %d.%d.%d.%d:%d to %d.%d.%d.%d:%d nat_entry %d proto %d", ip[0],ip[1],ip[2],ip[3], port, dip[0],dip[1],dip[2],dip[3], dport, nat_entry, pkt->proto);
+
+
+  return 0;
+  }
+
+int backward_nat(struct ETH_QUEUE* block) {// пакет из интернета (т.е. LWIP стека) в локалку
+  struct ETH_PKT_HDR *pkt = (struct ETH_PKT_HDR *) block->pbuf->pbuf.payload;
+  if (pkt->ethertype != htons(0x800)) return -1;// no match
+  if (pkt->ip_src != gnetif.ip_addr.addr && pkt->port_src != htons(NAT_DIVERT_PORT))
+    return -1;// local dgram
+  if (pkt->proto != PROT_TCP && pkt->proto != PROT_UDP && pkt->proto != PROT_ICMP) return -1;
+
+  uint32_t curtime = xTaskGetTickCount();
+
+  int nat_entry = -1;
+  for (int i = 0; i < NAT_TAB_SIZE; i++) {
+    if (pkt->ip_dst == nattab[i].src_ip && pkt->port_dst == nattab[i].src_port &&
+        pkt->proto == nattab[i].proto) {
+      nat_entry = i;
+      break;
+    }
+  }
+  if (nat_entry == -1) return -1;// no match
+  pkt->ip_src = nattab[nat_entry].dst_ip;
+  pkt->port_src = nattab[nat_entry].dst_port;
+
+  uint8_t* ip=&pkt->ip_src;
+  uint16_t port=htons(pkt->port_src);
+  uint8_t* dip=&pkt->ip_dst;
+  uint16_t dport=htons(pkt->port_dst);
+
+//  print_log("[NAT_TCP] === backward pkt from %d.%d.%d.%d:%d to %d.%d.%d.%d:%d nat_entry %d proto %d", ip[0],ip[1],ip[2],ip[3], port, dip[0],dip[1],dip[2],dip[3], dport, nat_entry, pkt->proto);
+
+  return 0;
+  }
+
+struct tcp_pcb* nat_tcp;
+
+static void nat_close_so_conn(uint32_t idx) {
+    if (nattab[idx].status) {
+      shutdown(nattab[idx].socket, SHUT_RDWR);
+      nattab[idx].status=0;
+      }
+//    if (nattab[idx].status) { close(nattab[idx].socket); nattab[idx].status=0;}
+}
+
+static void nat_close_lw_conn(uint32_t idx) {
+    if (nattab[idx].pcb) {
+      uint32_t ptr=nattab[idx].index_begin;
+      while (ptr!=nattab[idx].index_end) {
+        if (nattab[idx].p[ptr]) {
+            tcp_recved(nattab[idx].pcb, nattab[idx].p[ptr]->tot_len);
+            pbuf_free(nattab[idx].p[ptr]);
+            nat_stat.pbuf_used--;
+            nattab[idx].p[ptr]=NULL;
+        }
+        ptr++;
+        if (ptr>=SNDQ_MAXLEN) ptr=0;
+        }
+      nattab[idx].offs=0;
+      nattab[idx].index_begin=ptr;
+      nat_stat.tcp_close++;
+      err_t e=tcp_shutdown(nattab[idx].pcb, 1, 1);
+      if (e==ERR_OK) {
+          tcp_abort(nattab[idx].pcb);
+          nattab[idx].pcb=NULL;
+        }
+        nattab[idx].pcb=NULL;
+      }
+    nattab[idx].txbuf_len=0;
+}
+
+_Noreturn static void NAT_Task( void* arg ) {// здесь обслуживаем передачу из LWIP в сокет
+  uint32_t sel_req=0;
+  LOCK_LWIP_CORE();
+  while (1) {
+    uint32_t act;
+
+      int maxfd=-1;
+      fd_set wfd;
+      FD_ZERO(&wfd);
+      for (int i = 0; i < NAT_TAB_SIZE; i++) {
+        if (nattab[i].status>0 ) {// descriptor is active
+          if (nattab[i].socket>maxfd) maxfd=nattab[i].socket;
+          if (nattab[i].index_begin!=nattab[i].index_end) { FD_SET(nattab[i].socket, &wfd); sel_req=1; }
+        }
+      }
+
+      fd_set rfd;
+      FD_ZERO(&rfd);
+      FD_SET(nat_task_pipe[0], &rfd);
+      if (maxfd<nat_task_pipe[0]) maxfd=nat_task_pipe[0];
+
+      UNLOCK_LWIP_CORE();
+//      struct timeval timeout={0,100*1000};// x0.1s потом ожно добавить еще один локальный сокет чтобы будить (добавить поток)
+      int res = select(maxfd+1, &rfd, &wfd, NULL, NULL /*&timeout*/);
+      LOCK_LWIP_CORE();
+      if (res == -1) continue;
+
+      if (FD_ISSET(nat_task_pipe[0], &rfd)) {// new socket
+//        print_log("[NAT_Task] pipe event");
+        char dummy;
+        read(nat_task_pipe[0], &dummy, 1);// recv from socket
+        }
+
+      for (int i = 0; i < NAT_TAB_SIZE; i++) {
+        if (nattab[i].status==0) continue;// дескриптор куда-то делся
+        if (FD_ISSET(nattab[i].socket, &wfd)) do {// socket ready for write data
+          
+//            print_log("[NAT_Task] Write to tab %d", i);
+
+            struct pbuf *p=nattab[i].p[nattab[i].index_begin];
+            struct pbuf *p1=p;
+            uint32_t offs=nattab[i].offs;
+            int size=p->tot_len;
+            while(p1->next!=NULL && offs>=p1->len) {// SEEK to offs into pbuf chain
+              if (p1->next==NULL && p1->len!=size) { nat_stat.pbuf_broken++; size=p1->len; }
+              offs-=p1->len; size-=p1->len; p1=p->next;
+            }
+            int len=send(nattab[i].socket, (uint8_t*)p1->payload+offs, p->len-offs, MSG_DONTWAIT);
+//            print_log("[NAT_Task] tab %d send %d:%d bytes, %d sent", i, offs, p->len-offs, len);
+            if (len<0) {
+              if (errno == EAGAIN || errno == ENOBUFS) break;// 
+              print_log("[NAT_Task] tab %d send error, close connection (err %d: %s)", i, errno, strerror(errno));
+              nattab[i].shutdown_req=1;
+              nat_close_so_conn(i);
+              nat_close_lw_conn(i);
+              break;
+              }
+            nattab[i].offs+=len;
+            if (nattab[i].offs<p->tot_len) { sel_req=1; break;}// not all sent
+
+            nattab[i].p[nattab[i].index_begin]=0;
+            nattab[i].index_begin++;
+            if (nattab[i].index_begin>=SNDQ_MAXLEN) nattab[i].index_begin=0;
+            nattab[i].offs=0;
+            tcp_recved(nattab[i].pcb, p->tot_len);
+            nat_stat.pbuf_used--;
+            pbuf_free(p);
+//            print_log("[NAT_Task] tab %d free pbuf", i);
+        } while(0);
+      }
+  }
+}
+
+_Noreturn static void NAT_RX_Task( void* arg ) {// здесь обслуживаем прием из сокетов и передачу в LWIP
+  uint32_t sel_req=0;
+  LOCK_LWIP_CORE();
+  while (1) {
+    uint32_t act;
+
+      int maxfd=-1;
+      fd_set rfd, efd;
+      FD_ZERO(&rfd); FD_ZERO(&efd);
+      for (int i = 0; i < NAT_TAB_SIZE; i++) {
+        if (nattab[i].status>0 ) {// descriptor is active
+          if (nattab[i].socket>maxfd) maxfd=nattab[i].socket;
+          FD_SET(nattab[i].socket, &rfd);
+          FD_SET(nattab[i].socket, &efd);
+        }
+      }
+      FD_SET(nat_rx_task_pipe[0], &rfd);
+      if (maxfd<nat_rx_task_pipe[0]) maxfd=nat_rx_task_pipe[0];
+      if (maxfd==-1) {
+        UNLOCK_LWIP_CORE();
+        usleep(100*1000);
+        LOCK_LWIP_CORE();
+        continue;
+        }
+      UNLOCK_LWIP_CORE();
+//      struct timeval timeout={0,100*1000};// x0.1s потом ожно добавить еще один локальный сокет чтобы будить (добавить поток)
+      int res = select(maxfd+1, &rfd, NULL, &efd, NULL /*&timeout*/);
+      LOCK_LWIP_CORE();
+      if (res == -1) continue;
+
+      if (FD_ISSET(nat_rx_task_pipe[0], &rfd)) {// new socket
+//        print_log("[NAT_rxTask] pipe event");
+        char dummy;
+        read(nat_rx_task_pipe[0], &dummy, 1);// recv from socket
+        }
+
+      for (int i = 0; i < NAT_TAB_SIZE; i++) {
+        if (nattab[i].status==0) continue;// дескриптор куда-то делся
+        if (FD_ISSET(nattab[i].socket, &efd)) {// error: close connection
+            print_log("[NAT_rxTask] tab %d select errorfd occurs, close connection (by remote host)", i);
+            nattab[i].shutdown_req=1;
+            nat_close_so_conn(i);
+            nat_close_lw_conn(i);
+            continue;// отключили сокет
+        }
+        if (FD_ISSET(nattab[i].socket, &rfd)) {// socket ready for read data
+          int rfd_cont=0;
+          do {
+            if (nattab[i].txbuf_len <= 0) {
+              int len = recv(nattab[i].socket, nattab[i].txbuf, sizeof(nattab[0].txbuf), MSG_DONTWAIT);// recv from socket
+//              print_log("[NAT_rxTask] tab %d recv %d bytes err %d %s", i, len, errno, strerror(errno));
+              if (len==0 && rfd_cont==0) {// connection shutdown request
+                print_log("[NAT_rxTask] tab %d shutdown connection", i);
+                nattab[i].shutdown_req=1;
+                nat_close_so_conn(i);
+                nat_close_lw_conn(i);
+                break;
+                }
+              rfd_cont++;
+              if (len<0) {
+                if (errno == EAGAIN) break;//
+                print_log("[NAT_rxTask] tab %d recv error, close connection (err %d: %s)", i, errno, strerror(errno));
+                nattab[i].shutdown_req=1;
+                nat_close_so_conn(i);
+                nat_close_lw_conn(i);
+                }
+              if (len < 1) { break; }// error recv data
+              nattab[i].txbuf_len=len;
+            }
+            if (nattab[i].txbuf_len > 0) {
+              err_t err=tcp_write(nattab[i].pcb, nattab[i].txbuf, nattab[i].txbuf_len, TCP_WRITE_FLAG_COPY);// write to lwip
+              if (err==ERR_OK) {
+                nattab[i].txbuf_len=0;
+                continue;
+              }
+            }
+            break;
+          } while(1);
+        }
+      }
+  }
+}
+
+static void nat_tcp_err(void *arg, err_t err) { // The pcb had an error and is already deallocated. The argument might still be valid (if != NULL).
+    if (arg) {
+        uint32_t num=(int)arg-1;
+        print_log("[NAT_Task] tab %d close connection (by local host)", num);
+        if (num<NAT_TAB_SIZE) {
+          nat_close_so_conn(num);
+          nattab[num].pcb=NULL;
+          }
+    }
+}
+
+
+static int nat_find_match(uint32_t ip, uint16_t port, uint8_t proto) {
+  for (int i = 0; i < NAT_TAB_SIZE; i++) {
+    if (ip == nattab[i].src_ip && port == nattab[i].src_port && proto == nattab[i].proto) return i;
+  }
+  return -1;
+}
+
+static err_t nat_tcp_sent(void *arg, struct tcp_pcb *pcb, u16_t len) {// Data has been sent and acknowledged by the remote host. This means that more data can be sent.
+//  TNotifyAdd( &tNotifyHandle, taskNOTIFY_NEW_DATA);
+  write(nat_task_pipe[1], "1",1);// notify for new data
+  return ERR_OK;
+}
+
+
+static err_t nat_tcp_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err) { // Data has been received on this pcb.
+    uint32_t nat_entry=(int)arg-1;
+    if ((err != ERR_OK) || (pcb == NULL) || (p == NULL)) {
+      print_log("[NAT_LWTCP_RECV1] closing connection by loacl side request: err=%d pcb=%d p=%d", err, pcb, p);
+      if (nat_entry<NAT_TAB_SIZE) {
+        nattab[nat_entry].shutdown_req=1;
+        nat_close_so_conn(nat_entry);
+        nat_close_lw_conn(nat_entry);
+        }
+      return ERR_VAL;
+      }
+    uint32_t* ip=&pcb->remote_ip.addr;
+    uint16_t port=htons(pcb->remote_port);
+//    print_log("[NAT_LWTCP_RECV3] nat_entry=%d rport=%d %d.%d.%d.%d", nat_entry, htons(port), (*ip)&0xff, (*ip>>8)&0xff, (*ip>>16)&0xff, (*ip>>24)&0xff);
+    if (nat_entry>=NAT_TAB_SIZE) goto recv_abrt;
+    if (*ip!=nattab[nat_entry].src_ip || port != nattab[nat_entry].src_port || nattab[nat_entry].proto != PROT_TCP) {nattab[nat_entry].errors++; goto recv_abrt; }
+    uint16_t idx=nattab[nat_entry].index_end;
+    if (idx>=SNDQ_MAXLEN) { nattab[nat_entry].errors++; goto recv_abrt; }
+    int idx_next=idx+1;
+    if (idx_next>=SNDQ_MAXLEN) idx_next=0;
+    if (idx_next==nattab[nat_entry].index_begin) { nattab[nat_entry].rx_ovf++; print_log("[NAT_LWTCP_RECV] RX_OVF: idx_b=%d idx_e=%d", nattab[nat_entry].index_begin, nattab[nat_entry].index_end ); goto recv_abrt; }
+//    print_log("[NAT_TCP] tab %d LWIP RECV %d/%d bytes", nat_entry, p->len, p->tot_len);
+
+    if (nattab[nat_entry].pcb!=pcb) { print_log("[NAT_TCP] PCB not match!!!!!!!!!!!!!!!!"); while(1);}
+    nattab[nat_entry].p[idx]=p;
+    nattab[nat_entry].index_end=idx_next;
+    nat_stat.pbuf_used++;
+//    TNotifyAdd( &tNotifyHandle, taskNOTIFY_NEW_DATA);
+    write(nat_task_pipe[1], "1",1);// notify for new data
+
+//    nattab[nat_entry].shutdown_req=1;
+//    nat_close_so_conn(nat_entry);
+//    nat_close_lw_conn(nat_entry);
+
+    return ERR_OK;
+    recv_abrt:
+    if (p) {
+        tcp_recved(pcb, p->tot_len);
+        pbuf_free(p);
+    }
+    return ERR_OK;
+
+//    return ERR_ABRT;
+}
+
+static err_t nat_accept_fn(void *arg, struct tcp_pcb *pcb, err_t err) {
+//    print_log("[NAT_TCP] === NEW connection callback");
+
+    if ((err != ERR_OK) || (pcb == NULL)) { return ERR_VAL; }
+    uint8_t* ip=(uint8_t*)&pcb->remote_ip.addr;
+    uint16_t port=pcb->remote_port;
+    print_log("[NAT_TCP] === NEW connecion from %d.%d.%d.%d:%d", ip[0],ip[1],ip[2],ip[3], port);
+    int entry=nat_find_match(pcb->remote_ip.addr, htons(pcb->remote_port), PROT_TCP);
+    if (entry<0) return ERR_VAL;
+    tcp_arg(pcb, (void*)(entry+1));// arg for this TCP connection
+    int s=socket(AF_INET, SOCK_STREAM, 0);
+    if (s==-1) { print_log("[NAT_TCP] tab %d socket allocation err", entry); return ERR_VAL; }
+    int status = fcntl(s, F_SETFL, fcntl(s, F_GETFL, 0) | O_NONBLOCK);
+    if (status==-1) { close(s); print_log("[NAT_TCP] tab %d FCNTL error", entry); return ERR_VAL; }
+    int keepcnt = 8;
+    int keepidle = 2;
+    int keepintvl = 2;
+    int nodelay = 1;
+    int syncnt = 3;
+    setsockopt(s, IPPROTO_TCP, TCP_KEEPCNT, &keepcnt, sizeof(int));
+    setsockopt(s, IPPROTO_TCP, TCP_KEEPIDLE, &keepidle, sizeof(int));
+    setsockopt(s, IPPROTO_TCP, TCP_KEEPINTVL, &keepintvl, sizeof(int));
+    setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &nodelay, sizeof(int));
+    setsockopt(s, IPPROTO_TCP, TCP_SYNCNT, &syncnt, sizeof(int));
+    tcp_nagle_disabled(pcb);
+
+    struct sockaddr_in servaddr;
+    bzero(&servaddr, sizeof(servaddr));
+    servaddr.sin_family = AF_INET;
+    servaddr.sin_addr.s_addr = nattab[entry].dst_ip;
+    servaddr.sin_port = nattab[entry].dst_port;
+    ip=(uint8_t*)&servaddr.sin_addr.s_addr;
+    port=htons(servaddr.sin_port);
+    print_log("[NAT_TCP] === connecion to %d.%d.%d.%d:%d", ip[0],ip[1],ip[2],ip[3], port);
+    int r=connect(s, (struct sockaddr*)&servaddr, sizeof(servaddr));
+    if (r != 0) if (errno != EINPROGRESS)
+      {
+      print_log("[NAT_TCP] tab %d can not connect: %d", entry, errno);
+      close(s);
+      return ERR_VAL;
+      }
+    nattab[entry].socket=s;
+    nattab[entry].status=1;
+    nattab[entry].index_begin=0;
+    nattab[entry].index_end=0;
+    nattab[entry].offs=0;
+    nattab[entry].shutdown_req=0;
+    nattab[entry].pcb=pcb;
+
+    print_log("[NAT_TCP] tab %d new remote TCP conn", entry);
+
+    /* Set up the various callback functions */
+    tcp_recv(pcb, nat_tcp_recv);
+    tcp_err(pcb, nat_tcp_err);
+//    tcp_poll(pcb, nat_tcp_poll, HTTPD_POLL_INTERVAL);
+    tcp_sent(pcb, nat_tcp_sent);
+    nat_stat.tcp_new++;
+    write(nat_task_pipe[1], "1",1);// notify for new connection
+    write(nat_rx_task_pipe[1], "1",1);// notify for new connection
+
+    return ERR_OK;
+}
+
+void eth_nat_init() {
+    int ret=pipe2(&nat_task_pipe, O_NONBLOCK);
+    ret=pipe2(&nat_rx_task_pipe, O_NONBLOCK);
+    if (ret) return;
+
+    fcntl(nat_task_pipe[0], F_SETFL, O_NONBLOCK);
+    fcntl(nat_rx_task_pipe[0], F_SETFL, O_NONBLOCK);
+    fcntl(nat_task_pipe[1], F_SETFL, O_NONBLOCK);
+    fcntl(nat_rx_task_pipe[1], F_SETFL, O_NONBLOCK);
+
+//    TNotifyCreate(&tNotifyHandle);
+    TaskCreate (NAT_Task, &tnatHandle);
+    TaskCreate (NAT_RX_Task, &tnatRXHandle);
+
+    pthread_t tstats;
+    TaskCreate (calc_stats, &tstats);
+
+
+    nat_tcp=tcp_new_ip_type(IPADDR_TYPE_V4);
+    if (nat_tcp==NULL) return;
+    tcp_bind(nat_tcp, IP_ANY_TYPE, NAT_DIVERT_PORT);
+    err_t err;
+    nat_tcp=tcp_listen_with_backlog_and_err(nat_tcp, 10, &err);
+    if (nat_tcp==NULL) { print_log("[NAT_TCP] === NAT tcp listen failed (err %d)", err); return; }
+    tcp_accept(nat_tcp, nat_accept_fn);
+//  print_log("[NAT_TCP] === NAT INIT");
+
+}
@@ -0,0 +1,40 @@
+#define NAT_TAB_SIZE 16
+
+#define SNDQ_MAXLEN 100
+
+struct NAT_TAB {
+  uint32_t src_ip;// порядок байт в сетевом формате
+  uint32_t dst_ip;// порядок байт в сетевом формате
+  uint16_t src_port;// порядок байт в сетевом формате
+  uint16_t dst_port;// порядок байт в сетевом формате
+  uint16_t proto;
+  uint32_t time;
+
+  struct pbuf* p[SNDQ_MAXLEN];// очередь приема с lwip
+  uint8_t txbuf[1500];// на передачу в lwip
+  uint16_t txbuf_len;
+  struct tcp_pcb *pcb;// null - free
+  uint32_t index_begin;
+  uint32_t index_end;
+  uint32_t status;// 0-free, 1-active (for TCP-based entries)
+  int socket;
+  uint32_t offs;
+  uint32_t errors;
+  uint32_t rx_ovf;
+  uint32_t shutdown_req;// 1 - waiting for shutdown sockets
+  };
+
+struct NAT_STAT {
+  uint32_t pbuf_broken;
+  uint32_t tcp_new;
+  uint32_t tcp_close;
+  uint32_t pbuf_used;
+  uint32_t lw_conn_used;
+  uint32_t so_conn_used;
+  };
+extern struct NAT_STAT nat_stat;
+
+
+int forward_nat(struct ETH_QUEUE* block);
+int backward_nat(struct ETH_QUEUE* block);
+void eth_nat_init();
@@ -0,0 +1,34 @@
+#include "eth_mem.h"
+#include "eth_queue.h"
+
+void add_to_custom_queue(struct pbuf* p, struct ETH_Q* q) {
+  p->next = NULL;
+  ETH_MEM_DECL_PROTECT();
+  ETH_MEM_PROTECT();
+  if (q->q_len>=q->q_len_max) {// очередь уже полна. дропаем пакет.
+    q->lost++;
+    ETH_MEM_UNPROTECT();
+    pbuf_free(p);
+    return;
+    }
+  if (q->q_end) q->q_end->next=p; else q->q_begin=p;// этот элемент приписываем к концу очереди
+  q->q_end=p;// конечным элементом ставим этот элемент
+  q->q_len++;
+  if (q->q_len_max<q->q_len) q->q_len_max=q->q_len;
+  ETH_MEM_UNPROTECT();
+  }
+
+struct pbuf* get_from_custom_queue(struct ETH_Q* q) {
+  ETH_MEM_DECL_PROTECT();
+  ETH_MEM_PROTECT();
+  struct pbuf* p=(struct pbuf*)q->q_begin;
+  if (p==NULL) { ETH_MEM_UNPROTECT(); return NULL; }
+  struct pbuf* next_pbuf=p->next;
+  q->q_begin=next_pbuf;
+  if (next_pbuf == NULL) q->q_end = NULL;
+  if (q->q_len==0) EM_ASSERT(7);// ASSERT: сбой подсчета размера очереди.
+  q->q_len--;
+  ETH_MEM_UNPROTECT();
+  p->next=NULL;
+  return p;
+  }
@@ -0,0 +1,14 @@
+struct ETH_Q {
+  struct pbuf* q_begin;
+  struct pbuf* q_end;
+  uint32_t q_len;
+  uint32_t q_len_max;
+  uint32_t lost;
+  };
+
+// добавить ETH_PBUF p в очередь q
+void add_to_custom_queue(struct pbuf* p, struct ETH_Q* q);
+
+
+// возврат - NULL - очередь пуста; иначе pbuf
+struct pbuf* get_from_custom_queue(struct ETH_Q* q);
@@ -0,0 +1,124 @@
+#include <stdint.h>
+#include <string.h>
+#include <pthread.h>
+#include <semaphore.h>
+
+#include "eth_mem.h"
+#include "eth_router.h"
+#include "eth_router_cfg.h"
+#include "eth_nat.h"
+
+struct ETH_ROUTER_STATS eth_router_stats;
+
+struct ETH_QUEUEPOOL_CTRL xeth_queuepool_ctrl;
+struct ETH_QUEUE xeth_queuepool[ETH_MEM_BUFS_CNT] ETH_MEM_ALIGN;
+
+struct ETH_PBUF_CTRL xeth_pbuf_ctrl;
+struct ETH_PBUF eth_pbuf[ETH_PBUFS_CNT];
+uint8_t eth_pbuf_mem[ETH_PBUFS_CNT*ETH_MEM_BUF_SIZE];// граница элементов кратна 32 байтам. иначе будут проблемки с кешем.
+
+
+struct ETH_NETIF eth_netif_array[ETH_NETIFS];
+
+void eth_router_init() {
+  eth_router_add_bridge(&xeth_queuepool_ctrl, xeth_queuepool, ETH_MEM_BUFS_CNT, &xeth_pbuf_ctrl, eth_pbuf, eth_pbuf_mem, ETH_PBUFS_CNT, eth_netif_array, ETH_NETIFS);
+  eth_router_start_task(&xeth_queuepool_ctrl);
+  }
+
+
+#define ETHTYPE_IPV4 0x0800
+#define ETHTYPE_IPV6 0x86DD
+#define ETHTYPE_ARP 0x0806
+
+#define ETHTYPE_ADP 0x8777// braodcast топологии
+#define ETHTYPE_DBG 0x8778// unicast diagram
+#define ETHTYPE_CONTROLS 0x8779// controls, terminal, gui controls
+
+
+void sprint_pkt(char* pkt, int pkt_len) {
+  char textbuf[1000];
+  char textptr=0;
+
+  textptr+=sprintf(textbuf+textptr,"DMAC=%02X:%02X:%02X:%02X:%02X:%02X ",pkt[0],pkt[1],pkt[2],pkt[3],pkt[4],pkt[5]);
+  textptr+=sprintf(textbuf+textptr,"SMAC=%02X:%02X:%02X:%02X:%02X:%02X ",pkt[6],pkt[7],pkt[8],pkt[9],pkt[10],pkt[11]);
+  uint16_t ethertype=(pkt[12]<<8)+pkt[13];
+  textptr+=sprintf(textbuf+textptr,"ET=%04X ",ethertype);
+
+  if (ethertype == ETHTYPE_ARP) {
+    textptr+=sprintf(textbuf+textptr,"[ARP] ");
+    }
+  if (ethertype == ETHTYPE_IPV4) {
+    textptr+=sprintf(textbuf+textptr,"[IP4] ");
+    }
+  if (ethertype == ETHTYPE_ADP) {
+    textptr+=sprintf(textbuf+textptr,"[ADP] ");
+    }
+  if (ethertype == ETHTYPE_DBG) {
+    textptr+=sprintf(textbuf+textptr,"[DBG] ");
+    }
+  if (ethertype == ETHTYPE_CONTROLS) {
+    textptr+=sprintf(textbuf+textptr,"[CTR] ");
+    }
+
+  if (ethertype == ETHTYPE_ADP || ethertype == ETHTYPE_DBG || ethertype == ETHTYPE_CONTROLS) {
+
+    }
+
+  textptr+=sprintf(textbuf+textptr,"LEN=%d ",pkt_len);
+
+  print_log("%s",textbuf);
+  
+  }
+
+int prev_num;
+void eth_route_block(struct ETH_QUEUE* block) {
+
+
+  if (block->pbuf->pbuf.ref==0) EM_ASSERT(20);
+
+  int pbuf_num=(block->pbuf-eth_pbuf);
+
+  uint32_t src_netif=block->pbuf->pbuf.if_idx;
+
+
+//  sprint_pkt(block->pbuf->pbuf.payload, block->pbuf->pbuf.len);
+
+/*if (src_netif == LWIP_NETIF_ID) {
+  print_log("Route pbuf from lwip");
+  sprint_pkt(block->pbuf->pbuf.payload, block->pbuf->pbuf.len);
+  }*/
+
+  if (src_netif>=ETH_NETIFS) EM_ASSERT(21);// assert: invalid netif
+  if (src_netif==0) EM_ASSERT(22);// assert: invalid netif
+
+  if (src_netif==TEST_NETIF_ID) eth_router_stats.in_test++;
+  if (src_netif==BLE_NETIF_ID) eth_router_stats.in_ble++;
+
+  if (eth_netif_array[src_netif].if_up==0) {// src interface is down: drop packet & exit
+    block->pool->eth_netif_array[src_netif].dgrams_lost++;
+    eth_pbuf_free_request(block->pbuf);
+    eth_queue_entry_free(block);
+    print_log("interface (%d) is not up, dropping dgram ",src_netif);
+    return;
+    }
+
+//  block->pool->eth_netif_array[src_netif].dgrams_lost++;
+
+  uint32_t dst_netif=src_netif;
+  if (src_netif == BLE_NETIF_ID) {
+    forward_nat(block);
+    dst_netif=LWIP_NETIF_ID;
+    }
+  if (src_netif == LWIP_NETIF_ID) {
+    backward_nat(block);
+    dst_netif=BLE_NETIF_ID;
+    }
+
+  if (dst_netif>=ETH_NETIFS) EM_ASSERT(23);// assert: invalid netif
+  if (dst_netif==0) {
+    eth_pbuf_free_request(block->pbuf);
+    eth_queue_entry_free(block);
+    return;
+    }
+  eth_add_packet_to_output_queue(block, &block->pool->eth_netif_array[dst_netif]);
+  }
@@ -0,0 +1,58 @@
+#pragma once
+#include "eth_mem.h"
+
+struct __attribute__((__packed__)) MAC_ADDR {
+  uint32_t mac32;
+  uint16_t mac16;
+  };
+
+struct __attribute__((__packed__)) ETH_PKT_HDR {
+  struct MAC_ADDR dst_mac;
+  struct MAC_ADDR src_mac;
+  uint16_t ethertype;
+  uint8_t tos_hdrl;
+  uint8_t dscp;
+  uint16_t len;
+  uint16_t id;
+  uint16_t frag_offs;
+  uint8_t ttl;
+  uint8_t proto;
+  uint16_t hdr_csum;
+  uint32_t ip_src;
+  uint32_t ip_dst;
+  uint16_t port_src;// tcp/udp hdr
+  uint16_t port_dst;
+  };
+
+struct MAC_LOOKUP_TAB {
+  struct MAC_ADDR mac;
+  uint16_t time_upd;
+  uint8_t if_idx;
+  };
+
+struct ETH_ROUTER_STATS {
+  uint32_t in_test;
+  uint32_t in_ble;
+  uint32_t out_if_not_found;
+  uint32_t test_err;
+
+  };
+extern struct ETH_ROUTER_STATS eth_router_stats;
+
+void eth_route_block(struct ETH_QUEUE* block);
+uint32_t mac_search(struct MAC_ADDR mac);
+
+// проинициализировать мост по умолчанию (запускает eth_router_add_bridge с дефолтным пулом)
+void eth_router_init();
+void notify_eth_ble_send_queue_update();
+void notify_eth_uart_send_queue_update();
+
+//extern struct ETH_QUEUE xeth_queuepool[ETH_MEM_BUFS_CNT];
+extern struct ETH_QUEUEPOOL_CTRL xeth_queuepool_ctrl;
+extern struct ETH_QUEUE xeth_queuepool[ETH_MEM_BUFS_CNT];
+
+extern struct ETH_PBUF_CTRL xeth_pbuf_ctrl;
+extern struct ETH_PBUF eth_pbuf[ETH_PBUFS_CNT];
+extern uint8_t eth_pbuf_mem[ETH_PBUFS_CNT*ETH_MEM_BUF_SIZE];
+
+extern struct ETH_NETIF eth_netif_array[ETH_NETIFS];
@@ -0,0 +1,18 @@
+#pragma once
+
+#define ETH_MEM_BUFS_CNT 100 // количество буферов (занимают ETH_MEM_BUF_SIZE байт)
+#define ETH_PBUFS_CNT 400// (занимают один pbuf)
+#define ETH_MEM_BUF_SIZE 1600// размер данных ethernet пакета (начиная с мак адресов)
+#define ETH_NETIFS 4// макс. количество интерфейсов
+
+// номер интерфейса в роутере (начиная с единицы)
+#define LWIP_NETIF_ID 1
+#define TEST_NETIF_ID 2
+#define BLE_NETIF_ID 3
+
+// Зармеры исходящих очередей на интерфейсы
+#define LWIP_NETIF_QLEN 20
+#define UART_NETIF_QLEN 20
+#define BLE_NETIF_QLEN 20
+#define IN_BLE_NETIF_QLEN_THR 3
+#define IN_UART_NETIF_QLEN_THR 3
@@ -0,0 +1,138 @@
+#include "stdint.h"
+uint8_t imageCubes[] = {
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xe3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xc3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0x83, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0x01, 0xff, 0xff, 0xff, 0xff, 0xff, 0x01, 0xe3, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xfe, 0x01, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x03, 0xf1, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xfc, 0x60, 0xff, 0xff, 0xff, 0xff, 0x00, 0x03, 0xf0, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xf8, 0xe0, 0xff, 0xff, 0xff, 0xf0, 0xfe, 0x00, 0xe0, 0x7f, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xf1, 0xe0, 0x7f, 0xff, 0xff, 0xf0, 0xfe, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xe1, 0xc0, 0x7f, 0xff, 0xff, 0xf2, 0x7e, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xe1, 0xd8, 0x7f, 0xff, 0xff, 0xf1, 0x30, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xc1, 0xb8, 0x3f, 0xff, 0xff, 0xf0, 0xf8, 0x00, 0x07, 0xc7, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x80, 0x78, 0x3f, 0xff, 0xff, 0xf0, 0x7c, 0x00, 0x0f, 0xe3, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x00, 0x70, 0x1f, 0xff, 0xff, 0xfc, 0x7e, 0x00, 0x0f, 0xe1, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfe, 0x00, 0xf0, 0x1f, 0xff, 0xff, 0xfc, 0x3f, 0xf8, 0x03, 0xc1, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfc, 0x00, 0xee, 0x1f, 0xff, 0xff, 0xfe, 0x1f, 0xfc, 0x00, 0x0f, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf8, 0x00, 0x5e, 0x1f, 0xff, 0xff, 0xfe, 0x1f, 0xfc, 0x01, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf9, 0x80, 0x1e, 0x3f, 0xff, 0xff, 0xfe, 0x0f, 0xf0, 0x1f, 0xe0, 0x7f, 0xff, 0xff, 
+	0xff, 0xff, 0xf3, 0x80, 0x3c, 0x3f, 0xff, 0xff, 0xfe, 0x07, 0xe3, 0xfc, 0x00, 0x7f, 0xff, 0xff, 
+	0xff, 0xff, 0xe7, 0x80, 0x3c, 0x7d, 0xff, 0xff, 0xfe, 0x03, 0xff, 0xc0, 0x00, 0x7f, 0xff, 0xff, 
+	0xff, 0xff, 0xe7, 0x80, 0x38, 0xe0, 0x7f, 0xcf, 0xfd, 0x63, 0xf8, 0x00, 0x38, 0x7f, 0xff, 0xff, 
+	0xff, 0xff, 0xc7, 0x00, 0x10, 0xc1, 0x1f, 0xe7, 0xff, 0x77, 0xf0, 0x00, 0x7c, 0x7f, 0xff, 0xff, 
+	0xff, 0xff, 0xc6, 0xc0, 0x01, 0x00, 0x4e, 0x73, 0xff, 0x77, 0xf0, 0x00, 0xfc, 0x7f, 0xff, 0xff, 
+	0xff, 0xff, 0xc1, 0xe0, 0x02, 0x0e, 0x33, 0x3b, 0xff, 0x77, 0xee, 0x00, 0xf8, 0x7f, 0xff, 0xff, 
+	0xff, 0xff, 0xc1, 0xc0, 0x06, 0x1f, 0x7d, 0x9d, 0xff, 0x73, 0xff, 0x01, 0xf8, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xe3, 0xc0, 0x0c, 0x3f, 0xbe, 0x45, 0xff, 0xfb, 0xff, 0x00, 0xf0, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xe3, 0x80, 0x18, 0x7f, 0xbf, 0x90, 0xff, 0xf3, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xe3, 0xb0, 0x30, 0x7f, 0xbf, 0xe8, 0xff, 0xf3, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xe0, 0x70, 0x60, 0x7f, 0x3f, 0xf2, 0x7f, 0xf3, 0xfe, 0x18, 0x00, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf0, 0xf0, 0x40, 0x3e, 0x1f, 0xfd, 0xff, 0xf3, 0xd8, 0x7c, 0x00, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf0, 0xf0, 0x80, 0x00, 0x0f, 0xfe, 0x7f, 0xf3, 0xe0, 0xfc, 0x00, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf1, 0xe1, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xf3, 0xf8, 0xfc, 0x00, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf1, 0xc2, 0x00, 0x00, 0x07, 0xff, 0xff, 0xf3, 0xf8, 0xfc, 0x01, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf8, 0x84, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xf3, 0xfe, 0xf8, 0xf1, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf8, 0x08, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xf3, 0xff, 0x21, 0xf1, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf8, 0x10, 0x00, 0x00, 0x07, 0xff, 0xff, 0xf3, 0xff, 0xc3, 0xf1, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf8, 0x30, 0x00, 0x00, 0x07, 0xff, 0xff, 0xf3, 0xff, 0xf3, 0xf3, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfc, 0x60, 0x00, 0x00, 0x07, 0xff, 0xff, 0xf3, 0xff, 0xff, 0xe3, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfc, 0xc0, 0x00, 0x00, 0x07, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xc7, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfe, 0x80, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x80, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xe0, 0x00, 0x0f, 0xbf, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xf0, 0x00, 0x1f, 0xdf, 0xff, 0xff, 0xf9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xfe, 0x00, 0x3f, 0xdf, 0xff, 0xff, 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0x80, 0x3f, 0xbf, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xe0, 0x3f, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xf8, 0x0c, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+};
+
+uint8_t imageWolf[] = {
+	0xff, 0xff, 0xff, 0x8f, 0xe3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x9f, 0xf3, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x3f, 0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x3f, 0xf9, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfe, 0x7f, 0xfc, 0x7f, 0xff, 0xff, 0xff, 0xff, 0xfc, 0xff, 0xfc, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfc, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xf1, 0xff, 0xfe, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfc, 0xff, 0xff, 0x8f, 0xff, 0xff, 0xff, 0xff, 0xe7, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf9, 0x80, 0x7f, 0xe3, 0xff, 0xff, 0xff, 0xff, 0x9f, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf9, 0xea, 0x9f, 0xfc, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf1, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xf8, 0xd5, 0x7f, 0xfe, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe1, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfb, 0x29, 0x54, 0x5f, 0x9f, 0xff, 0xff, 0xff, 0xf9, 0xff, 0xb1, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfa, 0x80, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x5f, 0xc0, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfe, 0x07, 0x80, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x1f, 0xe0, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfe, 0x00, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x01, 0xb0, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xa8, 0x60, 0x7f, 0xff, 0xff, 
+	0xff, 0xff, 0xfd, 0x00, 0x00, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xfa, 0x37, 0x20, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfe, 0x01, 0xe0, 0x5f, 0xff, 0xff, 0xff, 0xff, 0xff, 0x05, 0xe0, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfe, 0x00, 0xd0, 0x3f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x3e, 0xe0, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x00, 0x7f, 0x8f, 0xff, 0xff, 0xff, 0xff, 0xf4, 0xfd, 0xf0, 0x7f, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x0c, 0x7f, 0xf3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc4, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x0f, 0x1f, 0xff, 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xf7, 0xef, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0x7f, 0xfa, 0xff, 0xef, 0xff, 0xff, 0xff, 0x28, 0x0b, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xfd, 0xff, 0xdf, 0xff, 0xf7, 0xff, 0xff, 0xfe, 0xc0, 0x2b, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xf5, 0xff, 0xfe, 0xff, 0xff, 0xfd, 0xbf, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xfe, 0x97, 0xff, 0xfb, 0xff, 0xff, 0xed, 0x4a, 0x95, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0xff, 0xff, 0xd2, 0xbf, 0xfa, 0xbf, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x7f, 0xff, 0xd3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xd7, 0xff, 0xfd, 0x3f, 0xff, 0x3a, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0x7f, 0xff, 0xf4, 0x9f, 0xff, 0x7b, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x9d, 0x9f, 0xff, 0x67, 0xbf, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x00, 0xff, 0xff, 0x4c, 0xaf, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0xbf, 0xff, 0xc9, 0xf1, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0x9e, 0xb8, 0x7f, 0xff, 0xc3, 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0x8f, 0xfc, 0x7f, 0xff, 0x86, 0x31, 0x7f, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xe3, 0xfe, 0x3f, 0xff, 0x1f, 0xe7, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xe0, 0x7f, 0x3f, 0xff, 0x3f, 0x8f, 0xff, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0xfe, 0xbf, 0xff, 0x3f, 0x3f, 0xd7, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xf7, 0xff, 0xff, 0xff, 0x7f, 0xfa, 0x1f, 0xff, 0xff, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xd5, 0xff, 0xff, 0xef, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x7f, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xf7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0xff, 0xfe, 0x0f, 0xff, 
+	0xff, 0xff, 0xff, 0xef, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfb, 0xa9, 0x17, 0xef, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0xff, 0xee, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xbf, 0xf1, 0xbf, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe3, 0xfc, 0x4f, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xe7, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x7e, 0x17, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x8b, 0xc7, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x6f, 0xff, 0xff, 0xff, 0xff, 0xf8, 0xb3, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x50, 0x1f, 0xff, 0xff, 0xff, 0xff, 0x93, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x0f, 0xff, 0x1f, 0xff, 0xff, 0xff, 0xf7, 0x47, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x3f, 0xff, 0x8f, 0xff, 0xff, 0xff, 0xfb, 0xa3, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x7f, 0xff, 0xc7, 0xff, 0xff, 0xff, 0xfe, 0xd3, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0xff, 0xff, 0xc7, 0xff, 0xff, 0xff, 0xff, 0xfb, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x7f, 0xff, 0xcf, 0xff, 0xff, 0xff, 0xff, 0xf9, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x7f, 0xff, 0xcf, 0xff, 0xff, 0xff, 0xff, 0xfd, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0x8f, 0xff, 0xff, 0xff, 0x5f, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xdf, 0xff, 0x1f, 0xff, 0xff, 0xff, 0xe7, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xbf, 0xff, 0xff, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0x9f, 0xbf, 
+	0xff, 0xff, 0xff, 0xff, 0xbf, 0xff, 0xff, 0xff, 0xfe, 0x1e, 0xef, 0xbf, 0xe7, 0xf7, 0xee, 0xdf, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xfb, 0xff, 0x80, 0x80, 0xff, 0x27, 0xff, 0xfd, 0xff, 0xe2, 0x6f, 
+	0xff, 0xff, 0xff, 0xff, 0xff, 0xf9, 0xff, 0xf8, 0x0f, 0xcf, 0xd7, 0xff, 0xff, 0xff, 0xf1, 0x37, 
+	0xff, 0xff, 0xff, 0xfe, 0xc7, 0xf9, 0x9f, 0xff, 0xbf, 0x9b, 0xf7, 0xff, 0xfb, 0xff, 0xf8, 0x13, 
+	0xff, 0xff, 0xff, 0xff, 0xdf, 0xe8, 0xcb, 0xfe, 0x1e, 0x1b, 0xbd, 0xff, 0xff, 0xff, 0xf4, 0x1b, 
+	0xff, 0xff, 0xff, 0xff, 0x1f, 0xdc, 0xe3, 0xfd, 0x8f, 0x1d, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x83, 
+	0xff, 0xff, 0xff, 0xff, 0x1f, 0xdc, 0xe3, 0xfd, 0x8f, 0x1d, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x83, 
+	0xff, 0xff, 0xff, 0xff, 0x1f, 0xdc, 0xe3, 0xfd, 0x8f, 0x1d, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x83, 
+};
@@ -0,0 +1,115 @@
+/**
+ * @file
+ * Error Management module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/err.h"
+#include "lwip/def.h"
+#include "lwip/sys.h"
+
+#include "lwip/errno.h"
+
+#if !NO_SYS
+/** Table to quickly map an lwIP error (err_t) to a socket error
+  * by using -err as an index */
+static const int err_to_errno_table[] = {
+  0,             /* ERR_OK          0      No error, everything OK. */
+  ENOMEM,        /* ERR_MEM        -1      Out of memory error.     */
+  ENOBUFS,       /* ERR_BUF        -2      Buffer error.            */
+  EWOULDBLOCK,   /* ERR_TIMEOUT    -3      Timeout                  */
+  EHOSTUNREACH,  /* ERR_RTE        -4      Routing problem.         */
+  EINPROGRESS,   /* ERR_INPROGRESS -5      Operation in progress    */
+  EINVAL,        /* ERR_VAL        -6      Illegal value.           */
+  EWOULDBLOCK,   /* ERR_WOULDBLOCK -7      Operation would block.   */
+  EADDRINUSE,    /* ERR_USE        -8      Address in use.          */
+  EALREADY,      /* ERR_ALREADY    -9      Already connecting.      */
+  EISCONN,       /* ERR_ISCONN     -10     Conn already established.*/
+  ENOTCONN,      /* ERR_CONN       -11     Not connected.           */
+  -1,            /* ERR_IF         -12     Low-level netif error    */
+  ECONNABORTED,  /* ERR_ABRT       -13     Connection aborted.      */
+  ECONNRESET,    /* ERR_RST        -14     Connection reset.        */
+  ENOTCONN,      /* ERR_CLSD       -15     Connection closed.       */
+  EIO            /* ERR_ARG        -16     Illegal argument.        */
+};
+
+int
+err_to_errno(err_t err)
+{
+  if ((err > 0) || (-err >= (err_t)LWIP_ARRAYSIZE(err_to_errno_table))) {
+    return EIO;
+  }
+  return err_to_errno_table[-err];
+}
+#endif /* !NO_SYS */
+
+#ifdef LWIP_DEBUG
+
+static const char *err_strerr[] = {
+  "Ok.",                    /* ERR_OK          0  */
+  "Out of memory error.",   /* ERR_MEM        -1  */
+  "Buffer error.",          /* ERR_BUF        -2  */
+  "Timeout.",               /* ERR_TIMEOUT    -3  */
+  "Routing problem.",       /* ERR_RTE        -4  */
+  "Operation in progress.", /* ERR_INPROGRESS -5  */
+  "Illegal value.",         /* ERR_VAL        -6  */
+  "Operation would block.", /* ERR_WOULDBLOCK -7  */
+  "Address in use.",        /* ERR_USE        -8  */
+  "Already connecting.",    /* ERR_ALREADY    -9  */
+  "Already connected.",     /* ERR_ISCONN     -10 */
+  "Not connected.",         /* ERR_CONN       -11 */
+  "Low-level netif error.", /* ERR_IF         -12 */
+  "Connection aborted.",    /* ERR_ABRT       -13 */
+  "Connection reset.",      /* ERR_RST        -14 */
+  "Connection closed.",     /* ERR_CLSD       -15 */
+  "Illegal argument."       /* ERR_ARG        -16 */
+};
+
+/**
+ * Convert an lwip internal error to a string representation.
+ *
+ * @param err an lwip internal err_t
+ * @return a string representation for err
+ */
+const char *
+lwip_strerr(err_t err)
+{
+  if ((err > 0) || (-err >= (err_t)LWIP_ARRAYSIZE(err_strerr))) {
+    return "Unknown error.";
+  }
+  return err_strerr[-err];
+}
+
+#endif /* LWIP_DEBUG */
@@ -0,0 +1,102 @@
+/**
+ * @file
+ * Interface Identification APIs from:
+ *              RFC 3493: Basic Socket Interface Extensions for IPv6
+ *                  Section 4: Interface Identification
+ *
+ * @defgroup if_api Interface Identification API
+ * @ingroup socket
+ */
+
+/*
+ * Copyright (c) 2017 Joel Cunningham, Garmin International, Inc. <joel.cunningham@garmin.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Joel Cunningham <joel.cunningham@me.com>
+ *
+ */
+#include "lwip/opt.h"
+
+#if LWIP_SOCKET
+
+#include "lwip/errno.h"
+#include "lwip/if_api.h"
+#include "lwip/netifapi.h"
+#include "lwip/priv/sockets_priv.h"
+
+/**
+ * @ingroup if_api
+ * Maps an interface index to its corresponding name.
+ * @param ifindex interface index
+ * @param ifname shall point to a buffer of at least {IF_NAMESIZE} bytes
+ * @return If ifindex is an interface index, then the function shall return the
+ * value supplied in ifname, which points to a buffer now containing the interface name.
+ * Otherwise, the function shall return a NULL pointer.
+ */
+char *
+lwip_if_indextoname(unsigned int ifindex, char *ifname)
+{
+#if LWIP_NETIF_API
+  if (ifindex <= 0xff) {
+    err_t err = netifapi_netif_index_to_name((u8_t)ifindex, ifname);
+    if (!err && ifname[0] != '\0') {
+      return ifname;
+    }
+  }
+#else /* LWIP_NETIF_API */
+  LWIP_UNUSED_ARG(ifindex);
+  LWIP_UNUSED_ARG(ifname);
+#endif /* LWIP_NETIF_API */
+  set_errno(ENXIO);
+  return NULL;
+}
+
+/**
+ * @ingroup if_api
+ * Returs the interface index corresponding to name ifname.
+ * @param ifname Interface name
+ * @return The corresponding index if ifname is the name of an interface;
+ * otherwise, zero.
+ */
+unsigned int
+lwip_if_nametoindex(const char *ifname)
+{
+#if LWIP_NETIF_API
+  err_t err;
+  u8_t idx;
+
+  err = netifapi_netif_name_to_index(ifname, &idx);
+  if (!err) {
+    return idx;
+  }
+#else /* LWIP_NETIF_API */
+  LWIP_UNUSED_ARG(ifname);
+#endif /* LWIP_NETIF_API */
+  return 0; /* invalid index */
+}
+
+#endif /* LWIP_SOCKET */
@@ -0,0 +1,669 @@
+/**
+ * @file
+ * Sequential API Main thread module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if !NO_SYS /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/priv/tcpip_priv.h"
+#include "lwip/sys.h"
+#include "lwip/memp.h"
+#include "lwip/mem.h"
+#include "lwip/init.h"
+#include "lwip/ip.h"
+#include "lwip/pbuf.h"
+#include "lwip/etharp.h"
+#include "netif/ethernet.h"
+
+#define TCPIP_MSG_VAR_REF(name)     API_VAR_REF(name)
+#define TCPIP_MSG_VAR_DECLARE(name) API_VAR_DECLARE(struct tcpip_msg, name)
+#define TCPIP_MSG_VAR_ALLOC(name)   API_VAR_ALLOC(struct tcpip_msg, MEMP_TCPIP_MSG_API, name, ERR_MEM)
+#define TCPIP_MSG_VAR_FREE(name)    API_VAR_FREE(MEMP_TCPIP_MSG_API, name)
+
+/* global variables */
+static tcpip_init_done_fn tcpip_init_done;
+static void *tcpip_init_done_arg;
+static sys_mbox_t tcpip_mbox;
+
+#if LWIP_TCPIP_CORE_LOCKING
+/** The global semaphore to lock the stack. */
+sys_mutex_t lock_tcpip_core;
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+
+static void tcpip_thread_handle_msg(struct tcpip_msg *msg);
+
+#if !LWIP_TIMERS
+/* wait for a message with timers disabled (e.g. pass a timer-check trigger into tcpip_thread) */
+#define TCPIP_MBOX_FETCH(mbox, msg) sys_mbox_fetch(mbox, msg)
+#else /* !LWIP_TIMERS */
+/* wait for a message, timeouts are processed while waiting */
+#define TCPIP_MBOX_FETCH(mbox, msg) tcpip_timeouts_mbox_fetch(mbox, msg)
+/**
+ * Wait (forever) for a message to arrive in an mbox.
+ * While waiting, timeouts are processed.
+ *
+ * @param mbox the mbox to fetch the message from
+ * @param msg the place to store the message
+ */
+static void
+tcpip_timeouts_mbox_fetch(sys_mbox_t *mbox, void **msg)
+{
+  u32_t sleeptime, res;
+
+again:
+  LWIP_ASSERT_CORE_LOCKED();
+
+  sleeptime = sys_timeouts_sleeptime();
+  if (sleeptime == SYS_TIMEOUTS_SLEEPTIME_INFINITE) {
+    UNLOCK_TCPIP_CORE();
+    sys_arch_mbox_fetch(mbox, msg, 0);
+    LOCK_TCPIP_CORE();
+    return;
+  } else if (sleeptime == 0) {
+    sys_check_timeouts();
+    /* We try again to fetch a message from the mbox. */
+    goto again;
+  }
+
+  UNLOCK_TCPIP_CORE();
+  res = sys_arch_mbox_fetch(mbox, msg, sleeptime);
+  LOCK_TCPIP_CORE();
+  if (res == SYS_ARCH_TIMEOUT) {
+    /* If a SYS_ARCH_TIMEOUT value is returned, a timeout occurred
+       before a message could be fetched. */
+    sys_check_timeouts();
+    /* We try again to fetch a message from the mbox. */
+    goto again;
+  }
+}
+#endif /* !LWIP_TIMERS */
+
+/**
+ * The main lwIP thread. This thread has exclusive access to lwIP core functions
+ * (unless access to them is not locked). Other threads communicate with this
+ * thread using message boxes.
+ *
+ * It also starts all the timers to make sure they are running in the right
+ * thread context.
+ *
+ * @param arg unused argument
+ */
+
+#include "FreeRTOS.h"
+#include "task.h"
+#include "semphr.h"
+SemaphoreHandle_t ipSemaphore = NULL;
+
+static void
+tcpip_thread(void *arg)
+{
+  struct tcpip_msg *msg;
+  LWIP_UNUSED_ARG(arg);
+
+  ipSemaphore = xSemaphoreCreateMutex();
+  xSemaphoreGive( ipSemaphore );
+  LWIP_MARK_TCPIP_THREAD();
+
+  LOCK_TCPIP_CORE();
+  if (tcpip_init_done != NULL) {
+    tcpip_init_done(tcpip_init_done_arg);
+  }
+
+  while (1) {                          /* MAIN Loop */
+    LWIP_TCPIP_THREAD_ALIVE();
+    /* wait for a message, timeouts are processed while waiting */
+    TCPIP_MBOX_FETCH(&tcpip_mbox, (void **)&msg);
+    if (msg == NULL) {
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: invalid message: NULL\n"));
+      LWIP_ASSERT("tcpip_thread: invalid message", 0);
+      continue;
+    }
+    if( xSemaphoreTake( ipSemaphore, ( TickType_t ) 0 ) ) {
+      tcpip_thread_handle_msg(msg);
+      xSemaphoreGive( ipSemaphore );
+      }
+  }
+}
+
+/* Handle a single tcpip_msg
+ * This is in its own function for access by tests only.
+ */
+static void
+tcpip_thread_handle_msg(struct tcpip_msg *msg)
+{
+  switch (msg->type) {
+#if !LWIP_TCPIP_CORE_LOCKING
+    case TCPIP_MSG_API:
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", (void *)msg));
+      msg->msg.api_msg.function(msg->msg.api_msg.msg);
+      break;
+    case TCPIP_MSG_API_CALL:
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API CALL message %p\n", (void *)msg));
+      msg->msg.api_call.arg->err = msg->msg.api_call.function(msg->msg.api_call.arg);
+      sys_sem_signal(msg->msg.api_call.sem);
+      break;
+#endif /* !LWIP_TCPIP_CORE_LOCKING */
+
+#if !LWIP_TCPIP_CORE_LOCKING_INPUT
+    case TCPIP_MSG_INPKT:
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
+      if (msg->msg.inp.input_fn(msg->msg.inp.p, msg->msg.inp.netif) != ERR_OK) {
+        pbuf_free(msg->msg.inp.p);
+      }
+      memp_free(MEMP_TCPIP_MSG_INPKT, msg);
+      break;
+#endif /* !LWIP_TCPIP_CORE_LOCKING_INPUT */
+
+#if LWIP_TCPIP_TIMEOUT && LWIP_TIMERS
+    case TCPIP_MSG_TIMEOUT:
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: TIMEOUT %p\n", (void *)msg));
+      sys_timeout(msg->msg.tmo.msecs, msg->msg.tmo.h, msg->msg.tmo.arg);
+      memp_free(MEMP_TCPIP_MSG_API, msg);
+      break;
+    case TCPIP_MSG_UNTIMEOUT:
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: UNTIMEOUT %p\n", (void *)msg));
+      sys_untimeout(msg->msg.tmo.h, msg->msg.tmo.arg);
+      memp_free(MEMP_TCPIP_MSG_API, msg);
+      break;
+#endif /* LWIP_TCPIP_TIMEOUT && LWIP_TIMERS */
+
+    case TCPIP_MSG_CALLBACK:
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
+      msg->msg.cb.function(msg->msg.cb.ctx);
+      memp_free(MEMP_TCPIP_MSG_API, msg);
+      break;
+
+    case TCPIP_MSG_CALLBACK_STATIC:
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK_STATIC %p\n", (void *)msg));
+      msg->msg.cb.function(msg->msg.cb.ctx);
+      break;
+
+    default:
+      LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: invalid message: %d\n", msg->type));
+      LWIP_ASSERT("tcpip_thread: invalid message", 0);
+      break;
+  }
+}
+
+#ifdef TCPIP_THREAD_TEST
+/** Work on queued items in single-threaded test mode */
+int
+tcpip_thread_poll_one(void)
+{
+  int ret = 0;
+  struct tcpip_msg *msg;
+
+  if (sys_arch_mbox_tryfetch(&tcpip_mbox, (void **)&msg) != SYS_ARCH_TIMEOUT) {
+    LOCK_TCPIP_CORE();
+    if (msg != NULL) {
+      tcpip_thread_handle_msg(msg);
+      ret = 1;
+    }
+    UNLOCK_TCPIP_CORE();
+  }
+  return ret;
+}
+#endif
+
+/**
+ * Pass a received packet to tcpip_thread for input processing
+ *
+ * @param p the received packet
+ * @param inp the network interface on which the packet was received
+ * @param input_fn input function to call
+ */
+err_t
+tcpip_inpkt(struct pbuf *p, struct netif *inp, netif_input_fn input_fn)
+{
+#if LWIP_TCPIP_CORE_LOCKING_INPUT
+  err_t ret;
+  LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_inpkt: PACKET %p/%p\n", (void *)p, (void *)inp));
+  LOCK_TCPIP_CORE();
+  ret = input_fn(p, inp);
+  UNLOCK_TCPIP_CORE();
+  return ret;
+#else /* LWIP_TCPIP_CORE_LOCKING_INPUT */
+  struct tcpip_msg *msg;
+
+  LWIP_ASSERT("Invalid mbox", sys_mbox_valid_val(tcpip_mbox));
+
+  msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_INPKT);
+  if (msg == NULL) {
+    return ERR_MEM;
+  }
+
+  msg->type = TCPIP_MSG_INPKT;
+  msg->msg.inp.p = p;
+  msg->msg.inp.netif = inp;
+  msg->msg.inp.input_fn = input_fn;
+  if (sys_mbox_trypost(&tcpip_mbox, msg) != ERR_OK) {
+    memp_free(MEMP_TCPIP_MSG_INPKT, msg);
+    return ERR_MEM;
+  }
+  return ERR_OK;
+#endif /* LWIP_TCPIP_CORE_LOCKING_INPUT */
+}
+
+/**
+ * @ingroup lwip_os
+ * Pass a received packet to tcpip_thread for input processing with
+ * ethernet_input or ip_input. Don't call directly, pass to netif_add()
+ * and call netif->input().
+ *
+ * @param p the received packet, p->payload pointing to the Ethernet header or
+ *          to an IP header (if inp doesn't have NETIF_FLAG_ETHARP or
+ *          NETIF_FLAG_ETHERNET flags)
+ * @param inp the network interface on which the packet was received
+ */
+err_t
+tcpip_input(struct pbuf *p, struct netif *inp)
+{
+#if LWIP_ETHERNET
+  if (inp->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
+    return tcpip_inpkt(p, inp, ethernet_input);
+  } else
+#endif /* LWIP_ETHERNET */
+    return tcpip_inpkt(p, inp, ip_input);
+}
+
+/**
+ * @ingroup lwip_os
+ * Call a specific function in the thread context of
+ * tcpip_thread for easy access synchronization.
+ * A function called in that way may access lwIP core code
+ * without fearing concurrent access.
+ * Blocks until the request is posted.
+ * Must not be called from interrupt context!
+ *
+ * @param function the function to call
+ * @param ctx parameter passed to f
+ * @return ERR_OK if the function was called, another err_t if not
+ *
+ * @see tcpip_try_callback
+ */
+err_t
+tcpip_callback(tcpip_callback_fn function, void *ctx)
+{
+  struct tcpip_msg *msg;
+
+  LWIP_ASSERT("Invalid mbox", sys_mbox_valid_val(tcpip_mbox));
+
+  msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
+  if (msg == NULL) {
+    return ERR_MEM;
+  }
+
+  msg->type = TCPIP_MSG_CALLBACK;
+  msg->msg.cb.function = function;
+  msg->msg.cb.ctx = ctx;
+
+  sys_mbox_post(&tcpip_mbox, msg);
+  return ERR_OK;
+}
+
+/**
+ * @ingroup lwip_os
+ * Call a specific function in the thread context of
+ * tcpip_thread for easy access synchronization.
+ * A function called in that way may access lwIP core code
+ * without fearing concurrent access.
+ * Does NOT block when the request cannot be posted because the
+ * tcpip_mbox is full, but returns ERR_MEM instead.
+ * Can be called from interrupt context.
+ *
+ * @param function the function to call
+ * @param ctx parameter passed to f
+ * @return ERR_OK if the function was called, another err_t if not
+ *
+ * @see tcpip_callback
+ */
+err_t
+tcpip_try_callback(tcpip_callback_fn function, void *ctx)
+{
+  struct tcpip_msg *msg;
+
+  LWIP_ASSERT("Invalid mbox", sys_mbox_valid_val(tcpip_mbox));
+
+  msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
+  if (msg == NULL) {
+    return ERR_MEM;
+  }
+
+  msg->type = TCPIP_MSG_CALLBACK;
+  msg->msg.cb.function = function;
+  msg->msg.cb.ctx = ctx;
+
+  if (sys_mbox_trypost(&tcpip_mbox, msg) != ERR_OK) {
+    memp_free(MEMP_TCPIP_MSG_API, msg);
+    return ERR_MEM;
+  }
+  return ERR_OK;
+}
+
+#if LWIP_TCPIP_TIMEOUT && LWIP_TIMERS
+/**
+ * call sys_timeout in tcpip_thread
+ *
+ * @param msecs time in milliseconds for timeout
+ * @param h function to be called on timeout
+ * @param arg argument to pass to timeout function h
+ * @return ERR_MEM on memory error, ERR_OK otherwise
+ */
+err_t
+tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
+{
+  struct tcpip_msg *msg;
+
+  LWIP_ASSERT("Invalid mbox", sys_mbox_valid_val(tcpip_mbox));
+
+  msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
+  if (msg == NULL) {
+    return ERR_MEM;
+  }
+
+  msg->type = TCPIP_MSG_TIMEOUT;
+  msg->msg.tmo.msecs = msecs;
+  msg->msg.tmo.h = h;
+  msg->msg.tmo.arg = arg;
+  sys_mbox_post(&tcpip_mbox, msg);
+  return ERR_OK;
+}
+
+/**
+ * call sys_untimeout in tcpip_thread
+ *
+ * @param h function to be called on timeout
+ * @param arg argument to pass to timeout function h
+ * @return ERR_MEM on memory error, ERR_OK otherwise
+ */
+err_t
+tcpip_untimeout(sys_timeout_handler h, void *arg)
+{
+  struct tcpip_msg *msg;
+
+  LWIP_ASSERT("Invalid mbox", sys_mbox_valid_val(tcpip_mbox));
+
+  msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
+  if (msg == NULL) {
+    return ERR_MEM;
+  }
+
+  msg->type = TCPIP_MSG_UNTIMEOUT;
+  msg->msg.tmo.h = h;
+  msg->msg.tmo.arg = arg;
+  sys_mbox_post(&tcpip_mbox, msg);
+  return ERR_OK;
+}
+#endif /* LWIP_TCPIP_TIMEOUT && LWIP_TIMERS */
+
+
+/**
+ * Sends a message to TCPIP thread to call a function. Caller thread blocks on
+ * on a provided semaphore, which ist NOT automatically signalled by TCPIP thread,
+ * this has to be done by the user.
+ * It is recommended to use LWIP_TCPIP_CORE_LOCKING since this is the way
+ * with least runtime overhead.
+ *
+ * @param fn function to be called from TCPIP thread
+ * @param apimsg argument to API function
+ * @param sem semaphore to wait on
+ * @return ERR_OK if the function was called, another err_t if not
+ */
+err_t
+tcpip_send_msg_wait_sem(tcpip_callback_fn fn, void *apimsg, sys_sem_t *sem)
+{
+#if LWIP_TCPIP_CORE_LOCKING
+  LWIP_UNUSED_ARG(sem);
+  LOCK_TCPIP_CORE();
+  fn(apimsg);
+  UNLOCK_TCPIP_CORE();
+  return ERR_OK;
+#else /* LWIP_TCPIP_CORE_LOCKING */
+  TCPIP_MSG_VAR_DECLARE(msg);
+
+  LWIP_ASSERT("semaphore not initialized", sys_sem_valid(sem));
+  LWIP_ASSERT("Invalid mbox", sys_mbox_valid_val(tcpip_mbox));
+
+  TCPIP_MSG_VAR_ALLOC(msg);
+  TCPIP_MSG_VAR_REF(msg).type = TCPIP_MSG_API;
+  TCPIP_MSG_VAR_REF(msg).msg.api_msg.function = fn;
+  TCPIP_MSG_VAR_REF(msg).msg.api_msg.msg = apimsg;
+  sys_mbox_post(&tcpip_mbox, &TCPIP_MSG_VAR_REF(msg));
+  sys_arch_sem_wait(sem, 0);
+  TCPIP_MSG_VAR_FREE(msg);
+  return ERR_OK;
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+}
+
+/**
+ * Synchronously calls function in TCPIP thread and waits for its completion.
+ * It is recommended to use LWIP_TCPIP_CORE_LOCKING (preferred) or
+ * LWIP_NETCONN_SEM_PER_THREAD.
+ * If not, a semaphore is created and destroyed on every call which is usually
+ * an expensive/slow operation.
+ * @param fn Function to call
+ * @param call Call parameters
+ * @return Return value from tcpip_api_call_fn
+ */
+err_t
+tcpip_api_call(tcpip_api_call_fn fn, struct tcpip_api_call_data *call)
+{
+#if LWIP_TCPIP_CORE_LOCKING
+  err_t err;
+  LOCK_TCPIP_CORE();
+  err = fn(call);
+  UNLOCK_TCPIP_CORE();
+  return err;
+#else /* LWIP_TCPIP_CORE_LOCKING */
+  TCPIP_MSG_VAR_DECLARE(msg);
+
+#if !LWIP_NETCONN_SEM_PER_THREAD
+  err_t err = sys_sem_new(&call->sem, 0);
+  if (err != ERR_OK) {
+    return err;
+  }
+#endif /* LWIP_NETCONN_SEM_PER_THREAD */
+
+  LWIP_ASSERT("Invalid mbox", sys_mbox_valid_val(tcpip_mbox));
+
+  TCPIP_MSG_VAR_ALLOC(msg);
+  TCPIP_MSG_VAR_REF(msg).type = TCPIP_MSG_API_CALL;
+  TCPIP_MSG_VAR_REF(msg).msg.api_call.arg = call;
+  TCPIP_MSG_VAR_REF(msg).msg.api_call.function = fn;
+#if LWIP_NETCONN_SEM_PER_THREAD
+  TCPIP_MSG_VAR_REF(msg).msg.api_call.sem = LWIP_NETCONN_THREAD_SEM_GET();
+#else /* LWIP_NETCONN_SEM_PER_THREAD */
+  TCPIP_MSG_VAR_REF(msg).msg.api_call.sem = &call->sem;
+#endif /* LWIP_NETCONN_SEM_PER_THREAD */
+  sys_mbox_post(&tcpip_mbox, &TCPIP_MSG_VAR_REF(msg));
+  sys_arch_sem_wait(TCPIP_MSG_VAR_REF(msg).msg.api_call.sem, 0);
+  TCPIP_MSG_VAR_FREE(msg);
+
+#if !LWIP_NETCONN_SEM_PER_THREAD
+  sys_sem_free(&call->sem);
+#endif /* LWIP_NETCONN_SEM_PER_THREAD */
+
+  return call->err;
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+}
+
+/**
+ * @ingroup lwip_os
+ * Allocate a structure for a static callback message and initialize it.
+ * The message has a special type such that lwIP never frees it.
+ * This is intended to be used to send "static" messages from interrupt context,
+ * e.g. the message is allocated once and posted several times from an IRQ
+ * using tcpip_callbackmsg_trycallback().
+ * Example usage: Trigger execution of an ethernet IRQ DPC routine in lwIP thread context.
+ * 
+ * @param function the function to call
+ * @param ctx parameter passed to function
+ * @return a struct pointer to pass to tcpip_callbackmsg_trycallback().
+ *
+ * @see tcpip_callbackmsg_trycallback()
+ * @see tcpip_callbackmsg_delete()
+ */
+struct tcpip_callback_msg *
+tcpip_callbackmsg_new(tcpip_callback_fn function, void *ctx)
+{
+  struct tcpip_msg *msg = (struct tcpip_msg *)memp_malloc(MEMP_TCPIP_MSG_API);
+  if (msg == NULL) {
+    return NULL;
+  }
+  msg->type = TCPIP_MSG_CALLBACK_STATIC;
+  msg->msg.cb.function = function;
+  msg->msg.cb.ctx = ctx;
+  return (struct tcpip_callback_msg *)msg;
+}
+
+/**
+ * @ingroup lwip_os
+ * Free a callback message allocated by tcpip_callbackmsg_new().
+ *
+ * @param msg the message to free
+ *
+ * @see tcpip_callbackmsg_new()
+ */
+void
+tcpip_callbackmsg_delete(struct tcpip_callback_msg *msg)
+{
+  memp_free(MEMP_TCPIP_MSG_API, msg);
+}
+
+/**
+ * @ingroup lwip_os
+ * Try to post a callback-message to the tcpip_thread tcpip_mbox.
+ *
+ * @param msg pointer to the message to post
+ * @return sys_mbox_trypost() return code
+ *
+ * @see tcpip_callbackmsg_new()
+ */
+err_t
+tcpip_callbackmsg_trycallback(struct tcpip_callback_msg *msg)
+{
+  LWIP_ASSERT("Invalid mbox", sys_mbox_valid_val(tcpip_mbox));
+  return sys_mbox_trypost(&tcpip_mbox, msg);
+}
+
+/**
+ * @ingroup lwip_os
+ * Try to post a callback-message to the tcpip_thread mbox.
+ * Same as @ref tcpip_callbackmsg_trycallback but calls sys_mbox_trypost_fromisr(),
+ * mainly to help FreeRTOS, where calls differ between task level and ISR level.
+ *
+ * @param msg pointer to the message to post
+ * @return sys_mbox_trypost_fromisr() return code (without change, so this
+ *         knowledge can be used to e.g. propagate "bool needs_scheduling")
+ *
+ * @see tcpip_callbackmsg_new()
+ */
+err_t
+tcpip_callbackmsg_trycallback_fromisr(struct tcpip_callback_msg *msg)
+{
+  LWIP_ASSERT("Invalid mbox", sys_mbox_valid_val(tcpip_mbox));
+  return sys_mbox_trypost_fromisr(&tcpip_mbox, msg);
+}
+
+/**
+ * @ingroup lwip_os
+ * Initialize this module:
+ * - initialize all sub modules
+ * - start the tcpip_thread
+ *
+ * @param initfunc a function to call when tcpip_thread is running and finished initializing
+ * @param arg argument to pass to initfunc
+ */
+void
+tcpip_init(tcpip_init_done_fn initfunc, void *arg)
+{
+  lwip_init();
+
+  tcpip_init_done = initfunc;
+  tcpip_init_done_arg = arg;
+  if (sys_mbox_new(&tcpip_mbox, TCPIP_MBOX_SIZE) != ERR_OK) {
+    LWIP_ASSERT("failed to create tcpip_thread mbox", 0);
+  }
+#if LWIP_TCPIP_CORE_LOCKING
+  if (sys_mutex_new(&lock_tcpip_core) != ERR_OK) {
+    LWIP_ASSERT("failed to create lock_tcpip_core", 0);
+  }
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+
+  sys_thread_new(TCPIP_THREAD_NAME, tcpip_thread, NULL, TCPIP_THREAD_STACKSIZE, TCPIP_THREAD_PRIO);
+}
+
+/**
+ * Simple callback function used with tcpip_callback to free a pbuf
+ * (pbuf_free has a wrong signature for tcpip_callback)
+ *
+ * @param p The pbuf (chain) to be dereferenced.
+ */
+static void
+pbuf_free_int(void *p)
+{
+  struct pbuf *q = (struct pbuf *)p;
+  pbuf_free(q);
+}
+
+/**
+ * A simple wrapper function that allows you to free a pbuf from interrupt context.
+ *
+ * @param p The pbuf (chain) to be dereferenced.
+ * @return ERR_OK if callback could be enqueued, an err_t if not
+ */
+err_t
+pbuf_free_callback(struct pbuf *p)
+{
+  return tcpip_try_callback(pbuf_free_int, p);
+}
+
+/**
+ * A simple wrapper function that allows you to free heap memory from
+ * interrupt context.
+ *
+ * @param m the heap memory to free
+ * @return ERR_OK if callback could be enqueued, an err_t if not
+ */
+err_t
+mem_free_callback(void *m)
+{
+  return tcpip_try_callback(mem_free, m);
+}
+
+#endif /* !NO_SYS */
@@ -0,0 +1,240 @@
+/**
+ * @file
+ * Common functions used throughout the stack.
+ *
+ * These are reference implementations of the byte swapping functions.
+ * Again with the aim of being simple, correct and fully portable.
+ * Byte swapping is the second thing you would want to optimize. You will
+ * need to port it to your architecture and in your cc.h:
+ *
+ * \#define lwip_htons(x) your_htons
+ * \#define lwip_htonl(x) your_htonl
+ *
+ * Note lwip_ntohs() and lwip_ntohl() are merely references to the htonx counterparts.
+ *
+ * If you \#define them to htons() and htonl(), you should
+ * \#define LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS to prevent lwIP from
+ * defining htonx/ntohx compatibility macros.
+
+ * @defgroup sys_nonstandard Non-standard functions
+ * @ingroup sys_layer
+ * lwIP provides default implementations for non-standard functions.
+ * These can be mapped to OS functions to reduce code footprint if desired.
+ * All defines related to this section must not be placed in lwipopts.h,
+ * but in arch/cc.h!
+ * These options cannot be \#defined in lwipopts.h since they are not options
+ * of lwIP itself, but options of the lwIP port to your system.
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt
+ *
+ */
+
+#include "lwip/opt.h"
+#include "lwip/def.h"
+
+#include <string.h>
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+
+#if !defined(lwip_htons)
+/**
+ * Convert an u16_t from host- to network byte order.
+ *
+ * @param n u16_t in host byte order
+ * @return n in network byte order
+ */
+u16_t
+lwip_htons(u16_t n)
+{
+  return PP_HTONS(n);
+}
+#endif /* lwip_htons */
+
+#if !defined(lwip_htonl)
+/**
+ * Convert an u32_t from host- to network byte order.
+ *
+ * @param n u32_t in host byte order
+ * @return n in network byte order
+ */
+u32_t
+lwip_htonl(u32_t n)
+{
+  return PP_HTONL(n);
+}
+#endif /* lwip_htonl */
+
+#endif /* BYTE_ORDER == LITTLE_ENDIAN */
+
+#ifndef lwip_strnstr
+/**
+ * @ingroup sys_nonstandard
+ * lwIP default implementation for strnstr() non-standard function.
+ * This can be \#defined to strnstr() depending on your platform port.
+ */
+char *
+lwip_strnstr(const char *buffer, const char *token, size_t n)
+{
+  const char *p;
+  size_t tokenlen = strlen(token);
+  if (tokenlen == 0) {
+    return LWIP_CONST_CAST(char *, buffer);
+  }
+  for (p = buffer; *p && (p + tokenlen <= buffer + n); p++) {
+    if ((*p == *token) && (strncmp(p, token, tokenlen) == 0)) {
+      return LWIP_CONST_CAST(char *, p);
+    }
+  }
+  return NULL;
+}
+#endif
+
+#ifndef lwip_stricmp
+/**
+ * @ingroup sys_nonstandard
+ * lwIP default implementation for stricmp() non-standard function.
+ * This can be \#defined to stricmp() depending on your platform port.
+ */
+int
+lwip_stricmp(const char *str1, const char *str2)
+{
+  char c1, c2;
+
+  do {
+    c1 = *str1++;
+    c2 = *str2++;
+    if (c1 != c2) {
+      char c1_upc = c1 | 0x20;
+      if ((c1_upc >= 'a') && (c1_upc <= 'z')) {
+        /* characters are not equal an one is in the alphabet range:
+        downcase both chars and check again */
+        char c2_upc = c2 | 0x20;
+        if (c1_upc != c2_upc) {
+          /* still not equal */
+          /* don't care for < or > */
+          return 1;
+        }
+      } else {
+        /* characters are not equal but none is in the alphabet range */
+        return 1;
+      }
+    }
+  } while (c1 != 0);
+  return 0;
+}
+#endif
+
+#ifndef lwip_strnicmp
+/**
+ * @ingroup sys_nonstandard
+ * lwIP default implementation for strnicmp() non-standard function.
+ * This can be \#defined to strnicmp() depending on your platform port.
+ */
+int
+lwip_strnicmp(const char *str1, const char *str2, size_t len)
+{
+  char c1, c2;
+
+  do {
+    c1 = *str1++;
+    c2 = *str2++;
+    if (c1 != c2) {
+      char c1_upc = c1 | 0x20;
+      if ((c1_upc >= 'a') && (c1_upc <= 'z')) {
+        /* characters are not equal an one is in the alphabet range:
+        downcase both chars and check again */
+        char c2_upc = c2 | 0x20;
+        if (c1_upc != c2_upc) {
+          /* still not equal */
+          /* don't care for < or > */
+          return 1;
+        }
+      } else {
+        /* characters are not equal but none is in the alphabet range */
+        return 1;
+      }
+    }
+    len--;
+  } while ((len != 0) && (c1 != 0));
+  return 0;
+}
+#endif
+
+#ifndef lwip_itoa
+/**
+ * @ingroup sys_nonstandard
+ * lwIP default implementation for itoa() non-standard function.
+ * This can be \#defined to itoa() or snprintf(result, bufsize, "%d", number) depending on your platform port.
+ */
+void
+lwip_itoa(char *result, size_t bufsize, int number)
+{
+  char *res = result;
+  char *tmp = result + bufsize - 1;
+  int n = (number >= 0) ? number : -number;
+
+  /* handle invalid bufsize */
+  if (bufsize < 2) {
+    if (bufsize == 1) {
+      *result = 0;
+    }
+    return;
+  }
+
+  /* First, add sign */
+  if (number < 0) {
+    *res++ = '-';
+  }
+  /* Then create the string from the end and stop if buffer full,
+     and ensure output string is zero terminated */
+  *tmp = 0;
+  while ((n != 0) && (tmp > res)) {
+    char val = (char)('0' + (n % 10));
+    tmp--;
+    *tmp = val;
+    n = n / 10;
+  }
+  if (n) {
+    /* buffer is too small */
+    *result = 0;
+    return;
+  }
+  if (*tmp == 0) {
+    /* Nothing added? */
+    *res++ = '0';
+    *res++ = 0;
+    return;
+  }
+  /* move from temporary buffer to output buffer (sign is not moved) */
+  memmove(res, tmp, (size_t)((result + bufsize) - tmp));
+}
+#endif
@@ -0,0 +1,608 @@
+/**
+ * @file
+ * Internet checksum functions.\n
+ *
+ * These are some reference implementations of the checksum algorithm, with the
+ * aim of being simple, correct and fully portable. Checksumming is the
+ * first thing you would want to optimize for your platform. If you create
+ * your own version, link it in and in your cc.h put:
+ *
+ * \#define LWIP_CHKSUM your_checksum_routine
+ *
+ * Or you can select from the implementations below by defining
+ * LWIP_CHKSUM_ALGORITHM to 1, 2 or 3.
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/inet_chksum.h"
+#include "lwip/def.h"
+#include "lwip/ip_addr.h"
+
+#include <string.h>
+
+#ifndef LWIP_CHKSUM
+# define LWIP_CHKSUM lwip_standard_chksum
+# ifndef LWIP_CHKSUM_ALGORITHM
+#  define LWIP_CHKSUM_ALGORITHM 2
+# endif
+u16_t lwip_standard_chksum(const void *dataptr, int len);
+#endif
+/* If none set: */
+#ifndef LWIP_CHKSUM_ALGORITHM
+# define LWIP_CHKSUM_ALGORITHM 0
+#endif
+
+#if (LWIP_CHKSUM_ALGORITHM == 1) /* Version #1 */
+/**
+ * lwip checksum
+ *
+ * @param dataptr points to start of data to be summed at any boundary
+ * @param len length of data to be summed
+ * @return host order (!) lwip checksum (non-inverted Internet sum)
+ *
+ * @note accumulator size limits summable length to 64k
+ * @note host endianess is irrelevant (p3 RFC1071)
+ */
+u16_t
+lwip_standard_chksum(const void *dataptr, int len)
+{
+  u32_t acc;
+  u16_t src;
+  const u8_t *octetptr;
+
+  acc = 0;
+  /* dataptr may be at odd or even addresses */
+  octetptr = (const u8_t *)dataptr;
+  while (len > 1) {
+    /* declare first octet as most significant
+       thus assume network order, ignoring host order */
+    src = (*octetptr) << 8;
+    octetptr++;
+    /* declare second octet as least significant */
+    src |= (*octetptr);
+    octetptr++;
+    acc += src;
+    len -= 2;
+  }
+  if (len > 0) {
+    /* accumulate remaining octet */
+    src = (*octetptr) << 8;
+    acc += src;
+  }
+  /* add deferred carry bits */
+  acc = (acc >> 16) + (acc & 0x0000ffffUL);
+  if ((acc & 0xffff0000UL) != 0) {
+    acc = (acc >> 16) + (acc & 0x0000ffffUL);
+  }
+  /* This maybe a little confusing: reorder sum using lwip_htons()
+     instead of lwip_ntohs() since it has a little less call overhead.
+     The caller must invert bits for Internet sum ! */
+  return lwip_htons((u16_t)acc);
+}
+#endif
+
+#if (LWIP_CHKSUM_ALGORITHM == 2) /* Alternative version #2 */
+/*
+ * Curt McDowell
+ * Broadcom Corp.
+ * csm@broadcom.com
+ *
+ * IP checksum two bytes at a time with support for
+ * unaligned buffer.
+ * Works for len up to and including 0x20000.
+ * by Curt McDowell, Broadcom Corp. 12/08/2005
+ *
+ * @param dataptr points to start of data to be summed at any boundary
+ * @param len length of data to be summed
+ * @return host order (!) lwip checksum (non-inverted Internet sum)
+ */
+u16_t
+lwip_standard_chksum(const void *dataptr, int len)
+{
+  const u8_t *pb = (const u8_t *)dataptr;
+  const u16_t *ps;
+  u16_t t = 0;
+  u32_t sum = 0;
+  int odd = ((mem_ptr_t)pb & 1);
+
+  /* Get aligned to u16_t */
+  if (odd && len > 0) {
+    ((u8_t *)&t)[1] = *pb++;
+    len--;
+  }
+
+  /* Add the bulk of the data */
+  ps = (const u16_t *)(const void *)pb;
+  while (len > 1) {
+    sum += *ps++;
+    len -= 2;
+  }
+
+  /* Consume left-over byte, if any */
+  if (len > 0) {
+    ((u8_t *)&t)[0] = *(const u8_t *)ps;
+  }
+
+  /* Add end bytes */
+  sum += t;
+
+  /* Fold 32-bit sum to 16 bits
+     calling this twice is probably faster than if statements... */
+  sum = FOLD_U32T(sum);
+  sum = FOLD_U32T(sum);
+
+  /* Swap if alignment was odd */
+  if (odd) {
+    sum = SWAP_BYTES_IN_WORD(sum);
+  }
+
+  return (u16_t)sum;
+}
+#endif
+
+#if (LWIP_CHKSUM_ALGORITHM == 3) /* Alternative version #3 */
+/**
+ * An optimized checksum routine. Basically, it uses loop-unrolling on
+ * the checksum loop, treating the head and tail bytes specially, whereas
+ * the inner loop acts on 8 bytes at a time.
+ *
+ * @arg start of buffer to be checksummed. May be an odd byte address.
+ * @len number of bytes in the buffer to be checksummed.
+ * @return host order (!) lwip checksum (non-inverted Internet sum)
+ *
+ * by Curt McDowell, Broadcom Corp. December 8th, 2005
+ */
+u16_t
+lwip_standard_chksum(const void *dataptr, int len)
+{
+  const u8_t *pb = (const u8_t *)dataptr;
+  const u16_t *ps;
+  u16_t t = 0;
+  const u32_t *pl;
+  u32_t sum = 0, tmp;
+  /* starts at odd byte address? */
+  int odd = ((mem_ptr_t)pb & 1);
+
+  if (odd && len > 0) {
+    ((u8_t *)&t)[1] = *pb++;
+    len--;
+  }
+
+  ps = (const u16_t *)(const void *)pb;
+
+  if (((mem_ptr_t)ps & 3) && len > 1) {
+    sum += *ps++;
+    len -= 2;
+  }
+
+  pl = (const u32_t *)(const void *)ps;
+
+  while (len > 7)  {
+    tmp = sum + *pl++;          /* ping */
+    if (tmp < sum) {
+      tmp++;                    /* add back carry */
+    }
+
+    sum = tmp + *pl++;          /* pong */
+    if (sum < tmp) {
+      sum++;                    /* add back carry */
+    }
+
+    len -= 8;
+  }
+
+  /* make room in upper bits */
+  sum = FOLD_U32T(sum);
+
+  ps = (const u16_t *)pl;
+
+  /* 16-bit aligned word remaining? */
+  while (len > 1) {
+    sum += *ps++;
+    len -= 2;
+  }
+
+  /* dangling tail byte remaining? */
+  if (len > 0) {                /* include odd byte */
+    ((u8_t *)&t)[0] = *(const u8_t *)ps;
+  }
+
+  sum += t;                     /* add end bytes */
+
+  /* Fold 32-bit sum to 16 bits
+     calling this twice is probably faster than if statements... */
+  sum = FOLD_U32T(sum);
+  sum = FOLD_U32T(sum);
+
+  if (odd) {
+    sum = SWAP_BYTES_IN_WORD(sum);
+  }
+
+  return (u16_t)sum;
+}
+#endif
+
+/** Parts of the pseudo checksum which are common to IPv4 and IPv6 */
+static u16_t
+inet_cksum_pseudo_base(struct pbuf *p, u8_t proto, u16_t proto_len, u32_t acc)
+{
+  struct pbuf *q;
+  int swapped = 0;
+
+  /* iterate through all pbuf in chain */
+  for (q = p; q != NULL; q = q->next) {
+    LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n",
+                             (void *)q, (void *)q->next));
+    acc += LWIP_CHKSUM(q->payload, q->len);
+    /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%"X32_F" \n", acc));*/
+    /* just executing this next line is probably faster that the if statement needed
+       to check whether we really need to execute it, and does no harm */
+    acc = FOLD_U32T(acc);
+    if (q->len % 2 != 0) {
+      swapped = !swapped;
+      acc = SWAP_BYTES_IN_WORD(acc);
+    }
+    /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%"X32_F" \n", acc));*/
+  }
+
+  if (swapped) {
+    acc = SWAP_BYTES_IN_WORD(acc);
+  }
+
+  acc += (u32_t)lwip_htons((u16_t)proto);
+  acc += (u32_t)lwip_htons(proto_len);
+
+  /* Fold 32-bit sum to 16 bits
+     calling this twice is probably faster than if statements... */
+  acc = FOLD_U32T(acc);
+  acc = FOLD_U32T(acc);
+  LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%"X32_F"\n", acc));
+  return (u16_t)~(acc & 0xffffUL);
+}
+
+#if LWIP_IPV4
+/* inet_chksum_pseudo:
+ *
+ * Calculates the IPv4 pseudo Internet checksum used by TCP and UDP for a pbuf chain.
+ * IP addresses are expected to be in network byte order.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param src source ip address (used for checksum of pseudo header)
+ * @param dst destination ip address (used for checksum of pseudo header)
+ * @param proto ip protocol (used for checksum of pseudo header)
+ * @param proto_len length of the ip data part (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+inet_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
+                   const ip4_addr_t *src, const ip4_addr_t *dest)
+{
+  u32_t acc;
+  u32_t addr;
+
+  addr = ip4_addr_get_u32(src);
+  acc = (addr & 0xffffUL);
+  acc = (u32_t)(acc + ((addr >> 16) & 0xffffUL));
+  addr = ip4_addr_get_u32(dest);
+  acc = (u32_t)(acc + (addr & 0xffffUL));
+  acc = (u32_t)(acc + ((addr >> 16) & 0xffffUL));
+  /* fold down to 16 bits */
+  acc = FOLD_U32T(acc);
+  acc = FOLD_U32T(acc);
+
+  return inet_cksum_pseudo_base(p, proto, proto_len, acc);
+}
+#endif /* LWIP_IPV4 */
+
+#if LWIP_IPV6
+/**
+ * Calculates the checksum with IPv6 pseudo header used by TCP and UDP for a pbuf chain.
+ * IPv6 addresses are expected to be in network byte order.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param proto ipv6 protocol/next header (used for checksum of pseudo header)
+ * @param proto_len length of the ipv6 payload (used for checksum of pseudo header)
+ * @param src source ipv6 address (used for checksum of pseudo header)
+ * @param dest destination ipv6 address (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+ip6_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
+                  const ip6_addr_t *src, const ip6_addr_t *dest)
+{
+  u32_t acc = 0;
+  u32_t addr;
+  u8_t addr_part;
+
+  for (addr_part = 0; addr_part < 4; addr_part++) {
+    addr = src->addr[addr_part];
+    acc = (u32_t)(acc + (addr & 0xffffUL));
+    acc = (u32_t)(acc + ((addr >> 16) & 0xffffUL));
+    addr = dest->addr[addr_part];
+    acc = (u32_t)(acc + (addr & 0xffffUL));
+    acc = (u32_t)(acc + ((addr >> 16) & 0xffffUL));
+  }
+  /* fold down to 16 bits */
+  acc = FOLD_U32T(acc);
+  acc = FOLD_U32T(acc);
+
+  return inet_cksum_pseudo_base(p, proto, proto_len, acc);
+}
+#endif /* LWIP_IPV6 */
+
+/* ip_chksum_pseudo:
+ *
+ * Calculates the IPv4 or IPv6 pseudo Internet checksum used by TCP and UDP for a pbuf chain.
+ * IP addresses are expected to be in network byte order.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param src source ip address (used for checksum of pseudo header)
+ * @param dst destination ip address (used for checksum of pseudo header)
+ * @param proto ip protocol (used for checksum of pseudo header)
+ * @param proto_len length of the ip data part (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+ip_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len,
+                 const ip_addr_t *src, const ip_addr_t *dest)
+{
+#if LWIP_IPV6
+  if (IP_IS_V6(dest)) {
+    return ip6_chksum_pseudo(p, proto, proto_len, ip_2_ip6(src), ip_2_ip6(dest));
+  }
+#endif /* LWIP_IPV6 */
+#if LWIP_IPV4 && LWIP_IPV6
+  else
+#endif /* LWIP_IPV4 && LWIP_IPV6 */
+#if LWIP_IPV4
+  {
+    return inet_chksum_pseudo(p, proto, proto_len, ip_2_ip4(src), ip_2_ip4(dest));
+  }
+#endif /* LWIP_IPV4 */
+}
+
+/** Parts of the pseudo checksum which are common to IPv4 and IPv6 */
+static u16_t
+inet_cksum_pseudo_partial_base(struct pbuf *p, u8_t proto, u16_t proto_len,
+                               u16_t chksum_len, u32_t acc)
+{
+  struct pbuf *q;
+  int swapped = 0;
+  u16_t chklen;
+
+  /* iterate through all pbuf in chain */
+  for (q = p; (q != NULL) && (chksum_len > 0); q = q->next) {
+    LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n",
+                             (void *)q, (void *)q->next));
+    chklen = q->len;
+    if (chklen > chksum_len) {
+      chklen = chksum_len;
+    }
+    acc += LWIP_CHKSUM(q->payload, chklen);
+    chksum_len = (u16_t)(chksum_len - chklen);
+    LWIP_ASSERT("delete me", chksum_len < 0x7fff);
+    /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%"X32_F" \n", acc));*/
+    /* fold the upper bit down */
+    acc = FOLD_U32T(acc);
+    if (q->len % 2 != 0) {
+      swapped = !swapped;
+      acc = SWAP_BYTES_IN_WORD(acc);
+    }
+    /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%"X32_F" \n", acc));*/
+  }
+
+  if (swapped) {
+    acc = SWAP_BYTES_IN_WORD(acc);
+  }
+
+  acc += (u32_t)lwip_htons((u16_t)proto);
+  acc += (u32_t)lwip_htons(proto_len);
+
+  /* Fold 32-bit sum to 16 bits
+     calling this twice is probably faster than if statements... */
+  acc = FOLD_U32T(acc);
+  acc = FOLD_U32T(acc);
+  LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%"X32_F"\n", acc));
+  return (u16_t)~(acc & 0xffffUL);
+}
+
+#if LWIP_IPV4
+/* inet_chksum_pseudo_partial:
+ *
+ * Calculates the IPv4 pseudo Internet checksum used by TCP and UDP for a pbuf chain.
+ * IP addresses are expected to be in network byte order.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param src source ip address (used for checksum of pseudo header)
+ * @param dst destination ip address (used for checksum of pseudo header)
+ * @param proto ip protocol (used for checksum of pseudo header)
+ * @param proto_len length of the ip data part (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+inet_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
+                           u16_t chksum_len, const ip4_addr_t *src, const ip4_addr_t *dest)
+{
+  u32_t acc;
+  u32_t addr;
+
+  addr = ip4_addr_get_u32(src);
+  acc = (addr & 0xffffUL);
+  acc = (u32_t)(acc + ((addr >> 16) & 0xffffUL));
+  addr = ip4_addr_get_u32(dest);
+  acc = (u32_t)(acc + (addr & 0xffffUL));
+  acc = (u32_t)(acc + ((addr >> 16) & 0xffffUL));
+  /* fold down to 16 bits */
+  acc = FOLD_U32T(acc);
+  acc = FOLD_U32T(acc);
+
+  return inet_cksum_pseudo_partial_base(p, proto, proto_len, chksum_len, acc);
+}
+#endif /* LWIP_IPV4 */
+
+#if LWIP_IPV6
+/**
+ * Calculates the checksum with IPv6 pseudo header used by TCP and UDP for a pbuf chain.
+ * IPv6 addresses are expected to be in network byte order. Will only compute for a
+ * portion of the payload.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param proto ipv6 protocol/next header (used for checksum of pseudo header)
+ * @param proto_len length of the ipv6 payload (used for checksum of pseudo header)
+ * @param chksum_len number of payload bytes used to compute chksum
+ * @param src source ipv6 address (used for checksum of pseudo header)
+ * @param dest destination ipv6 address (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+ip6_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
+                          u16_t chksum_len, const ip6_addr_t *src, const ip6_addr_t *dest)
+{
+  u32_t acc = 0;
+  u32_t addr;
+  u8_t addr_part;
+
+  for (addr_part = 0; addr_part < 4; addr_part++) {
+    addr = src->addr[addr_part];
+    acc = (u32_t)(acc + (addr & 0xffffUL));
+    acc = (u32_t)(acc + ((addr >> 16) & 0xffffUL));
+    addr = dest->addr[addr_part];
+    acc = (u32_t)(acc + (addr & 0xffffUL));
+    acc = (u32_t)(acc + ((addr >> 16) & 0xffffUL));
+  }
+  /* fold down to 16 bits */
+  acc = FOLD_U32T(acc);
+  acc = FOLD_U32T(acc);
+
+  return inet_cksum_pseudo_partial_base(p, proto, proto_len, chksum_len, acc);
+}
+#endif /* LWIP_IPV6 */
+
+/* ip_chksum_pseudo_partial:
+ *
+ * Calculates the IPv4 or IPv6 pseudo Internet checksum used by TCP and UDP for a pbuf chain.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param src source ip address (used for checksum of pseudo header)
+ * @param dst destination ip address (used for checksum of pseudo header)
+ * @param proto ip protocol (used for checksum of pseudo header)
+ * @param proto_len length of the ip data part (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+ip_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len,
+                         u16_t chksum_len, const ip_addr_t *src, const ip_addr_t *dest)
+{
+#if LWIP_IPV6
+  if (IP_IS_V6(dest)) {
+    return ip6_chksum_pseudo_partial(p, proto, proto_len, chksum_len, ip_2_ip6(src), ip_2_ip6(dest));
+  }
+#endif /* LWIP_IPV6 */
+#if LWIP_IPV4 && LWIP_IPV6
+  else
+#endif /* LWIP_IPV4 && LWIP_IPV6 */
+#if LWIP_IPV4
+  {
+    return inet_chksum_pseudo_partial(p, proto, proto_len, chksum_len, ip_2_ip4(src), ip_2_ip4(dest));
+  }
+#endif /* LWIP_IPV4 */
+}
+
+/* inet_chksum:
+ *
+ * Calculates the Internet checksum over a portion of memory. Used primarily for IP
+ * and ICMP.
+ *
+ * @param dataptr start of the buffer to calculate the checksum (no alignment needed)
+ * @param len length of the buffer to calculate the checksum
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+
+u16_t
+inet_chksum(const void *dataptr, u16_t len)
+{
+  return (u16_t)~(unsigned int)LWIP_CHKSUM(dataptr, len);
+}
+
+/**
+ * Calculate a checksum over a chain of pbufs (without pseudo-header, much like
+ * inet_chksum only pbufs are used).
+ *
+ * @param p pbuf chain over that the checksum should be calculated
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+inet_chksum_pbuf(struct pbuf *p)
+{
+  u32_t acc;
+  struct pbuf *q;
+  int swapped = 0;
+
+  acc = 0;
+  for (q = p; q != NULL; q = q->next) {
+    acc += LWIP_CHKSUM(q->payload, q->len);
+    acc = FOLD_U32T(acc);
+    if (q->len % 2 != 0) {
+      swapped = !swapped;
+      acc = SWAP_BYTES_IN_WORD(acc);
+    }
+  }
+
+  if (swapped) {
+    acc = SWAP_BYTES_IN_WORD(acc);
+  }
+  return (u16_t)~(acc & 0xffffUL);
+}
+
+/* These are some implementations for LWIP_CHKSUM_COPY, which copies data
+ * like MEMCPY but generates a checksum at the same time. Since this is a
+ * performance-sensitive function, you might want to create your own version
+ * in assembly targeted at your hardware by defining it in lwipopts.h:
+ *   #define LWIP_CHKSUM_COPY(dst, src, len) your_chksum_copy(dst, src, len)
+ */
+
+#if (LWIP_CHKSUM_COPY_ALGORITHM == 1) /* Version #1 */
+/** Safe but slow: first call MEMCPY, then call LWIP_CHKSUM.
+ * For architectures with big caches, data might still be in cache when
+ * generating the checksum after copying.
+ */
+u16_t
+lwip_chksum_copy(void *dst, const void *src, u16_t len)
+{
+  MEMCPY(dst, src, len);
+  return LWIP_CHKSUM(dst, len);
+}
+#endif /* (LWIP_CHKSUM_COPY_ALGORITHM == 1) */
@@ -0,0 +1,380 @@
+/**
+ * @file
+ * Modules initialization
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/init.h"
+#include "lwip/stats.h"
+#include "lwip/sys.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/pbuf.h"
+#include "lwip/netif.h"
+#include "lwip/sockets.h"
+#include "lwip/ip.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/priv/tcp_priv.h"
+#include "lwip/igmp.h"
+#include "lwip/dns.h"
+#include "lwip/timeouts.h"
+#include "lwip/etharp.h"
+#include "lwip/ip6.h"
+#include "lwip/nd6.h"
+#include "lwip/mld6.h"
+#include "lwip/api.h"
+
+#include "netif/ppp/ppp_opts.h"
+#include "netif/ppp/ppp_impl.h"
+
+#ifndef LWIP_SKIP_PACKING_CHECK
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct packed_struct_test {
+  PACK_STRUCT_FLD_8(u8_t  dummy1);
+  PACK_STRUCT_FIELD(u32_t dummy2);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/epstruct.h"
+#endif
+#define PACKED_STRUCT_TEST_EXPECTED_SIZE 5
+
+#endif
+
+/* Compile-time sanity checks for configuration errors.
+ * These can be done independently of LWIP_DEBUG, without penalty.
+ */
+#ifndef BYTE_ORDER
+#error "BYTE_ORDER is not defined, you have to define it in your cc.h"
+#endif
+#if (!IP_SOF_BROADCAST && IP_SOF_BROADCAST_RECV)
+#error "If you want to use broadcast filter per pcb on recv operations, you have to define IP_SOF_BROADCAST=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_UDPLITE)
+#error "If you want to use UDP Lite, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_DHCP)
+#error "If you want to use DHCP, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && !LWIP_RAW && LWIP_MULTICAST_TX_OPTIONS)
+#error "If you want to use LWIP_MULTICAST_TX_OPTIONS, you have to define LWIP_UDP=1 and/or LWIP_RAW=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_DNS)
+#error "If you want to use DNS, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if !MEMP_MEM_MALLOC /* MEMP_NUM_* checks are disabled when not using the pool allocator */
+#if (LWIP_ARP && ARP_QUEUEING && (MEMP_NUM_ARP_QUEUE<=0))
+#error "If you want to use ARP Queueing, you have to define MEMP_NUM_ARP_QUEUE>=1 in your lwipopts.h"
+#endif
+#if (LWIP_RAW && (MEMP_NUM_RAW_PCB<=0))
+#error "If you want to use RAW, you have to define MEMP_NUM_RAW_PCB>=1 in your lwipopts.h"
+#endif
+#if (LWIP_UDP && (MEMP_NUM_UDP_PCB<=0))
+#error "If you want to use UDP, you have to define MEMP_NUM_UDP_PCB>=1 in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (MEMP_NUM_TCP_PCB<=0))
+#error "If you want to use TCP, you have to define MEMP_NUM_TCP_PCB>=1 in your lwipopts.h"
+#endif
+#if (LWIP_IGMP && (MEMP_NUM_IGMP_GROUP<=1))
+#error "If you want to use IGMP, you have to define MEMP_NUM_IGMP_GROUP>1 in your lwipopts.h"
+#endif
+#if (LWIP_IGMP && !LWIP_MULTICAST_TX_OPTIONS)
+#error "If you want to use IGMP, you have to define LWIP_MULTICAST_TX_OPTIONS==1 in your lwipopts.h"
+#endif
+#if (LWIP_IGMP && !LWIP_IPV4)
+#error "IGMP needs LWIP_IPV4 enabled in your lwipopts.h"
+#endif
+#if ((LWIP_NETCONN || LWIP_SOCKET) && (MEMP_NUM_TCPIP_MSG_API<=0))
+#error "If you want to use Sequential API, you have to define MEMP_NUM_TCPIP_MSG_API>=1 in your lwipopts.h"
+#endif
+/* There must be sufficient timeouts, taking into account requirements of the subsystems. */
+#if LWIP_TIMERS && (MEMP_NUM_SYS_TIMEOUT < LWIP_NUM_SYS_TIMEOUT_INTERNAL)
+#error "MEMP_NUM_SYS_TIMEOUT is too low to accomodate all required timeouts"
+#endif
+#if (IP_REASSEMBLY && (MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS))
+#error "MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS doesn't make sense since each struct ip_reassdata must hold 2 pbufs at least!"
+#endif
+#endif /* !MEMP_MEM_MALLOC */
+#if LWIP_WND_SCALE
+#if (LWIP_TCP && (TCP_WND > 0xffffffff))
+#error "If you want to use TCP, TCP_WND must fit in an u32_t, so, you have to reduce it in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (TCP_RCV_SCALE > 14))
+#error "The maximum valid window scale value is 14!"
+#endif
+#if (LWIP_TCP && (TCP_WND > (0xFFFFU << TCP_RCV_SCALE)))
+#error "TCP_WND is bigger than the configured LWIP_WND_SCALE allows!"
+#endif
+#if (LWIP_TCP && ((TCP_WND >> TCP_RCV_SCALE) == 0))
+#error "TCP_WND is too small for the configured LWIP_WND_SCALE (results in zero window)!"
+#endif
+#else /* LWIP_WND_SCALE */
+#if (LWIP_TCP && (TCP_WND > 0xffff))
+#error "If you want to use TCP, TCP_WND must fit in an u16_t, so, you have to reduce it in your lwipopts.h (or enable window scaling)"
+#endif
+#endif /* LWIP_WND_SCALE */
+#if (LWIP_TCP && (TCP_SND_QUEUELEN > 0xffff))
+#error "If you want to use TCP, TCP_SND_QUEUELEN must fit in an u16_t, so, you have to reduce it in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (TCP_SND_QUEUELEN < 2))
+#error "TCP_SND_QUEUELEN must be at least 2 for no-copy TCP writes to work"
+#endif
+#if (LWIP_TCP && ((TCP_MAXRTX > 12) || (TCP_SYNMAXRTX > 12)))
+#error "If you want to use TCP, TCP_MAXRTX and TCP_SYNMAXRTX must less or equal to 12 (due to tcp_backoff table), so, you have to reduce them in your lwipopts.h"
+#endif
+#if (LWIP_TCP && TCP_LISTEN_BACKLOG && ((TCP_DEFAULT_LISTEN_BACKLOG < 0) || (TCP_DEFAULT_LISTEN_BACKLOG > 0xff)))
+#error "If you want to use TCP backlog, TCP_DEFAULT_LISTEN_BACKLOG must fit into an u8_t"
+#endif
+#if (LWIP_TCP && LWIP_TCP_SACK_OUT && !TCP_QUEUE_OOSEQ)
+#error "To use LWIP_TCP_SACK_OUT, TCP_QUEUE_OOSEQ needs to be enabled"
+#endif
+#if (LWIP_TCP && LWIP_TCP_SACK_OUT && (LWIP_TCP_MAX_SACK_NUM < 1))
+#error "LWIP_TCP_MAX_SACK_NUM must be greater than 0"
+#endif
+#if (LWIP_NETIF_API && (NO_SYS==1))
+#error "If you want to use NETIF API, you have to define NO_SYS=0 in your lwipopts.h"
+#endif
+#if ((LWIP_SOCKET || LWIP_NETCONN) && (NO_SYS==1))
+#error "If you want to use Sequential API, you have to define NO_SYS=0 in your lwipopts.h"
+#endif
+#if (LWIP_PPP_API && (NO_SYS==1))
+#error "If you want to use PPP API, you have to define NO_SYS=0 in your lwipopts.h"
+#endif
+#if (LWIP_PPP_API && (PPP_SUPPORT==0))
+#error "If you want to use PPP API, you have to enable PPP_SUPPORT in your lwipopts.h"
+#endif
+#if (((!LWIP_DHCP) || (!LWIP_AUTOIP)) && LWIP_DHCP_AUTOIP_COOP)
+#error "If you want to use DHCP/AUTOIP cooperation mode, you have to define LWIP_DHCP=1 and LWIP_AUTOIP=1 in your lwipopts.h"
+#endif
+#if (((!LWIP_DHCP) || (!LWIP_ARP)) && DHCP_DOES_ARP_CHECK)
+#error "If you want to use DHCP ARP checking, you have to define LWIP_DHCP=1 and LWIP_ARP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_ARP && LWIP_AUTOIP)
+#error "If you want to use AUTOIP, you have to define LWIP_ARP=1 in your lwipopts.h"
+#endif
+#if (LWIP_TCP && ((LWIP_EVENT_API && LWIP_CALLBACK_API) || (!LWIP_EVENT_API && !LWIP_CALLBACK_API)))
+#error "One and exactly one of LWIP_EVENT_API and LWIP_CALLBACK_API has to be enabled in your lwipopts.h"
+#endif
+#if (LWIP_ALTCP && LWIP_EVENT_API)
+#error "The application layered tcp API does not work with LWIP_EVENT_API"
+#endif
+#if (MEM_LIBC_MALLOC && MEM_USE_POOLS)
+#error "MEM_LIBC_MALLOC and MEM_USE_POOLS may not both be simultaneously enabled in your lwipopts.h"
+#endif
+#if (MEM_USE_POOLS && !MEMP_USE_CUSTOM_POOLS)
+#error "MEM_USE_POOLS requires custom pools (MEMP_USE_CUSTOM_POOLS) to be enabled in your lwipopts.h"
+#endif
+#if (PBUF_POOL_BUFSIZE <= MEM_ALIGNMENT)
+#error "PBUF_POOL_BUFSIZE must be greater than MEM_ALIGNMENT or the offset may take the full first pbuf"
+#endif
+#if (DNS_LOCAL_HOSTLIST && !DNS_LOCAL_HOSTLIST_IS_DYNAMIC && !(defined(DNS_LOCAL_HOSTLIST_INIT)))
+#error "you have to define define DNS_LOCAL_HOSTLIST_INIT {{'host1', 0x123}, {'host2', 0x234}} to initialize DNS_LOCAL_HOSTLIST"
+#endif
+#if PPP_SUPPORT && !PPPOS_SUPPORT && !PPPOE_SUPPORT && !PPPOL2TP_SUPPORT
+#error "PPP_SUPPORT needs at least one of PPPOS_SUPPORT, PPPOE_SUPPORT or PPPOL2TP_SUPPORT turned on"
+#endif
+#if PPP_SUPPORT && !PPP_IPV4_SUPPORT && !PPP_IPV6_SUPPORT
+#error "PPP_SUPPORT needs PPP_IPV4_SUPPORT and/or PPP_IPV6_SUPPORT turned on"
+#endif
+#if PPP_SUPPORT && PPP_IPV4_SUPPORT && !LWIP_IPV4
+#error "PPP_IPV4_SUPPORT needs LWIP_IPV4 turned on"
+#endif
+#if PPP_SUPPORT && PPP_IPV6_SUPPORT && !LWIP_IPV6
+#error "PPP_IPV6_SUPPORT needs LWIP_IPV6 turned on"
+#endif
+#if !LWIP_ETHERNET && (LWIP_ARP || PPPOE_SUPPORT)
+#error "LWIP_ETHERNET needs to be turned on for LWIP_ARP or PPPOE_SUPPORT"
+#endif
+#if LWIP_TCPIP_CORE_LOCKING_INPUT && !LWIP_TCPIP_CORE_LOCKING
+#error "When using LWIP_TCPIP_CORE_LOCKING_INPUT, LWIP_TCPIP_CORE_LOCKING must be enabled, too"
+#endif
+#if LWIP_TCP && LWIP_NETIF_TX_SINGLE_PBUF && !TCP_OVERSIZE
+#error "LWIP_NETIF_TX_SINGLE_PBUF needs TCP_OVERSIZE enabled to create single-pbuf TCP packets"
+#endif
+#if LWIP_NETCONN && LWIP_TCP
+#if NETCONN_COPY != TCP_WRITE_FLAG_COPY
+#error "NETCONN_COPY != TCP_WRITE_FLAG_COPY"
+#endif
+#if NETCONN_MORE != TCP_WRITE_FLAG_MORE
+#error "NETCONN_MORE != TCP_WRITE_FLAG_MORE"
+#endif
+#endif /* LWIP_NETCONN && LWIP_TCP */
+#if LWIP_SOCKET
+#endif /* LWIP_SOCKET */
+
+
+/* Compile-time checks for deprecated options.
+ */
+#ifdef MEMP_NUM_TCPIP_MSG
+#error "MEMP_NUM_TCPIP_MSG option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef TCP_REXMIT_DEBUG
+#error "TCP_REXMIT_DEBUG option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef RAW_STATS
+#error "RAW_STATS option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef ETHARP_QUEUE_FIRST
+#error "ETHARP_QUEUE_FIRST option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef ETHARP_ALWAYS_INSERT
+#error "ETHARP_ALWAYS_INSERT option is deprecated. Remove it from your lwipopts.h."
+#endif
+#if !NO_SYS && LWIP_TCPIP_CORE_LOCKING && LWIP_COMPAT_MUTEX && !defined(LWIP_COMPAT_MUTEX_ALLOWED)
+#error "LWIP_COMPAT_MUTEX cannot prevent priority inversion. It is recommended to implement priority-aware mutexes. (Define LWIP_COMPAT_MUTEX_ALLOWED to disable this error.)"
+#endif
+
+#ifndef LWIP_DISABLE_TCP_SANITY_CHECKS
+#define LWIP_DISABLE_TCP_SANITY_CHECKS  0
+#endif
+#ifndef LWIP_DISABLE_MEMP_SANITY_CHECKS
+#define LWIP_DISABLE_MEMP_SANITY_CHECKS 0
+#endif
+
+/* MEMP sanity checks */
+#if MEMP_MEM_MALLOC
+#if !LWIP_DISABLE_MEMP_SANITY_CHECKS
+#if LWIP_NETCONN || LWIP_SOCKET
+#if !MEMP_NUM_NETCONN && LWIP_SOCKET
+#error "lwip_sanity_check: WARNING: MEMP_NUM_NETCONN cannot be 0 when using sockets!"
+#endif
+#else /* MEMP_MEM_MALLOC */
+#if MEMP_NUM_NETCONN > (MEMP_NUM_TCP_PCB+MEMP_NUM_TCP_PCB_LISTEN+MEMP_NUM_UDP_PCB+MEMP_NUM_RAW_PCB)
+#error "lwip_sanity_check: WARNING: MEMP_NUM_NETCONN should be less than the sum of MEMP_NUM_{TCP,RAW,UDP}_PCB+MEMP_NUM_TCP_PCB_LISTEN. If you know what you are doing, define LWIP_DISABLE_MEMP_SANITY_CHECKS to 1 to disable this error."
+#endif
+#endif /* LWIP_NETCONN || LWIP_SOCKET */
+#endif /* !LWIP_DISABLE_MEMP_SANITY_CHECKS */
+#if MEM_USE_POOLS
+#error "MEMP_MEM_MALLOC and MEM_USE_POOLS cannot be enabled at the same time"
+#endif
+#ifdef LWIP_HOOK_MEMP_AVAILABLE
+#error "LWIP_HOOK_MEMP_AVAILABLE doesn't make sense with MEMP_MEM_MALLOC"
+#endif
+#endif /* MEMP_MEM_MALLOC */
+
+/* TCP sanity checks */
+#if !LWIP_DISABLE_TCP_SANITY_CHECKS
+#if LWIP_TCP
+#if !MEMP_MEM_MALLOC && (MEMP_NUM_TCP_SEG < TCP_SND_QUEUELEN)
+#error "lwip_sanity_check: WARNING: MEMP_NUM_TCP_SEG should be at least as big as TCP_SND_QUEUELEN. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
+#endif
+#if TCP_SND_BUF < (2 * TCP_MSS)
+#error "lwip_sanity_check: WARNING: TCP_SND_BUF must be at least as much as (2 * TCP_MSS) for things to work smoothly. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
+#endif
+#if TCP_SND_QUEUELEN < (2 * (TCP_SND_BUF / TCP_MSS))
+#error "lwip_sanity_check: WARNING: TCP_SND_QUEUELEN must be at least as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
+#endif
+#if TCP_SNDLOWAT >= TCP_SND_BUF
+#error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must be less than TCP_SND_BUF. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
+#endif
+#if TCP_SNDLOWAT >= (0xFFFF - (4 * TCP_MSS))
+#error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must at least be 4*MSS below u16_t overflow!"
+#endif
+#if TCP_SNDQUEUELOWAT >= TCP_SND_QUEUELEN
+#error "lwip_sanity_check: WARNING: TCP_SNDQUEUELOWAT must be less than TCP_SND_QUEUELEN. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
+#endif
+#if !MEMP_MEM_MALLOC && PBUF_POOL_SIZE && (PBUF_POOL_BUFSIZE <= (PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))
+#error "lwip_sanity_check: WARNING: PBUF_POOL_BUFSIZE does not provide enough space for protocol headers. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
+#endif
+#if !MEMP_MEM_MALLOC && PBUF_POOL_SIZE && (TCP_WND > (PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - (PBUF_LINK_ENCAPSULATION_HLEN + PBUF_LINK_HLEN + PBUF_IP_HLEN + PBUF_TRANSPORT_HLEN))))
+#error "lwip_sanity_check: WARNING: TCP_WND is larger than space provided by PBUF_POOL_SIZE * (PBUF_POOL_BUFSIZE - protocol headers). If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
+#endif
+#if TCP_WND < TCP_MSS
+#error "lwip_sanity_check: WARNING: TCP_WND is smaller than MSS. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
+#endif
+#endif /* LWIP_TCP */
+#endif /* !LWIP_DISABLE_TCP_SANITY_CHECKS */
+
+/**
+ * @ingroup lwip_nosys
+ * Initialize all modules.
+ * Use this in NO_SYS mode. Use tcpip_init() otherwise.
+ */
+void
+lwip_init(void)
+{
+#ifndef LWIP_SKIP_CONST_CHECK
+  int a = 0;
+  LWIP_UNUSED_ARG(a);
+  LWIP_ASSERT("LWIP_CONST_CAST not implemented correctly. Check your lwIP port.", LWIP_CONST_CAST(void *, &a) == &a);
+#endif
+#ifndef LWIP_SKIP_PACKING_CHECK
+  LWIP_ASSERT("Struct packing not implemented correctly. Check your lwIP port.", sizeof(struct packed_struct_test) == PACKED_STRUCT_TEST_EXPECTED_SIZE);
+#endif
+
+  /* Modules initialization */
+  stats_init();
+#if !NO_SYS
+  sys_init();
+#endif /* !NO_SYS */
+  mem_init();
+  memp_init();
+  pbuf_init();
+  netif_init();
+#if LWIP_IPV4
+  ip_init();
+#if LWIP_ARP
+  etharp_init();
+#endif /* LWIP_ARP */
+#endif /* LWIP_IPV4 */
+#if LWIP_RAW
+  raw_init();
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+  udp_init();
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+  tcp_init();
+#endif /* LWIP_TCP */
+#if LWIP_IGMP
+  igmp_init();
+#endif /* LWIP_IGMP */
+#if LWIP_DNS
+  dns_init();
+#endif /* LWIP_DNS */
+#if PPP_SUPPORT
+  ppp_init();
+#endif
+
+#if LWIP_TIMERS
+  sys_timeouts_init();
+#endif /* LWIP_TIMERS */
+}
@@ -0,0 +1,167 @@
+/**
+ * @file
+ * Common IPv4 and IPv6 code
+ *
+ * @defgroup ip IP
+ * @ingroup callbackstyle_api
+ *
+ * @defgroup ip4 IPv4
+ * @ingroup ip
+ *
+ * @defgroup ip6 IPv6
+ * @ingroup ip
+ *
+ * @defgroup ipaddr IP address handling
+ * @ingroup infrastructure
+ *
+ * @defgroup ip4addr IPv4 only
+ * @ingroup ipaddr
+ *
+ * @defgroup ip6addr IPv6 only
+ * @ingroup ipaddr
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_IPV4 || LWIP_IPV6
+
+#include "lwip/ip_addr.h"
+#include "lwip/ip.h"
+
+/** Global data for both IPv4 and IPv6 */
+struct ip_globals ip_data;
+
+#if LWIP_IPV4 && LWIP_IPV6
+
+const ip_addr_t ip_addr_any_type = IPADDR_ANY_TYPE_INIT;
+
+/**
+ * @ingroup ipaddr
+ * Convert numeric IP address (both versions) into ASCII representation.
+ * returns ptr to static buffer; not reentrant!
+ *
+ * @param addr ip address in network order to convert
+ * @return pointer to a global static (!) buffer that holds the ASCII
+ *         representation of addr
+ */
+char *ipaddr_ntoa(const ip_addr_t *addr)
+{
+  if (addr == NULL) {
+    return NULL;
+  }
+  if (IP_IS_V6(addr)) {
+    return ip6addr_ntoa(ip_2_ip6(addr));
+  } else {
+    return ip4addr_ntoa(ip_2_ip4(addr));
+  }
+}
+
+/**
+ * @ingroup ipaddr
+ * Same as ipaddr_ntoa, but reentrant since a user-supplied buffer is used.
+ *
+ * @param addr ip address in network order to convert
+ * @param buf target buffer where the string is stored
+ * @param buflen length of buf
+ * @return either pointer to buf which now holds the ASCII
+ *         representation of addr or NULL if buf was too small
+ */
+char *ipaddr_ntoa_r(const ip_addr_t *addr, char *buf, int buflen)
+{
+  if (addr == NULL) {
+    return NULL;
+  }
+  if (IP_IS_V6(addr)) {
+    return ip6addr_ntoa_r(ip_2_ip6(addr), buf, buflen);
+  } else {
+    return ip4addr_ntoa_r(ip_2_ip4(addr), buf, buflen);
+  }
+}
+
+/**
+ * @ingroup ipaddr
+ * Convert IP address string (both versions) to numeric.
+ * The version is auto-detected from the string.
+ *
+ * @param cp IP address string to convert
+ * @param addr conversion result is stored here
+ * @return 1 on success, 0 on error
+ */
+int
+ipaddr_aton(const char *cp, ip_addr_t *addr)
+{
+  if (cp != NULL) {
+    const char *c;
+    for (c = cp; *c != 0; c++) {
+      if (*c == ':') {
+        /* contains a colon: IPv6 address */
+        if (addr) {
+          IP_SET_TYPE_VAL(*addr, IPADDR_TYPE_V6);
+        }
+        return ip6addr_aton(cp, ip_2_ip6(addr));
+      } else if (*c == '.') {
+        /* contains a dot: IPv4 address */
+        break;
+      }
+    }
+    /* call ip4addr_aton as fallback or if IPv4 was found */
+    if (addr) {
+      IP_SET_TYPE_VAL(*addr, IPADDR_TYPE_V4);
+    }
+    return ip4addr_aton(cp, ip_2_ip4(addr));
+  }
+  return 0;
+}
+
+/**
+ * @ingroup lwip_nosys
+ * If both IP versions are enabled, this function can dispatch packets to the correct one.
+ * Don't call directly, pass to netif_add() and call netif->input().
+ */
+err_t
+ip_input(struct pbuf *p, struct netif *inp)
+{
+  if (p != NULL) {
+    if (IP_HDR_GET_VERSION(p->payload) == 6) {
+      return ip6_input(p, inp);
+    }
+    return ip4_input(p, inp);
+  }
+  return ERR_VAL;
+}
+
+#endif /* LWIP_IPV4 && LWIP_IPV6 */
+
+#endif /* LWIP_IPV4 || LWIP_IPV6 */
@@ -0,0 +1,527 @@
+/**
+ * @file
+ * AutoIP Automatic LinkLocal IP Configuration
+ *
+ * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
+ * with RFC 3927.
+ *
+ * @defgroup autoip AUTOIP
+ * @ingroup ip4
+ * AUTOIP related functions
+ * USAGE:
+ *
+ * define @ref LWIP_AUTOIP 1 in your lwipopts.h
+ * Options:
+ * AUTOIP_TMR_INTERVAL msecs,
+ *   I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
+ *   Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
+ *
+ * Without DHCP:
+ * - Call autoip_start() after netif_add().
+ *
+ * With DHCP:
+ * - define @ref LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
+ * - Configure your DHCP Client.
+ *
+ * @see netifapi_autoip
+ */
+
+/*
+ *
+ * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Dominik Spies <kontakt@dspies.de>
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_IPV4 && LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/mem.h"
+/* #include "lwip/udp.h" */
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/autoip.h"
+#include "lwip/etharp.h"
+#include "lwip/prot/autoip.h"
+
+#include <string.h>
+
+/** Pseudo random macro based on netif informations.
+ * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
+#ifndef LWIP_AUTOIP_RAND
+#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
+                                   ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
+                                   ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
+                                   ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
+                                   (netif_autoip_data(netif)? netif_autoip_data(netif)->tried_llipaddr : 0))
+#endif /* LWIP_AUTOIP_RAND */
+
+/**
+ * Macro that generates the initial IP address to be tried by AUTOIP.
+ * If you want to override this, define it to something else in lwipopts.h.
+ */
+#ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
+#define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
+  lwip_htonl(AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
+                 ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
+#endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
+
+/* static functions */
+static err_t autoip_arp_announce(struct netif *netif);
+static void autoip_start_probing(struct netif *netif);
+
+/**
+ * @ingroup autoip
+ * Set a statically allocated struct autoip to work with.
+ * Using this prevents autoip_start to allocate it using mem_malloc.
+ *
+ * @param netif the netif for which to set the struct autoip
+ * @param autoip (uninitialised) autoip struct allocated by the application
+ */
+void
+autoip_set_struct(struct netif *netif, struct autoip *autoip)
+{
+  LWIP_ASSERT_CORE_LOCKED();
+  LWIP_ASSERT("netif != NULL", netif != NULL);
+  LWIP_ASSERT("autoip != NULL", autoip != NULL);
+  LWIP_ASSERT("netif already has a struct autoip set",
+              netif_autoip_data(netif) == NULL);
+
+  /* clear data structure */
+  memset(autoip, 0, sizeof(struct autoip));
+  /* autoip->state = AUTOIP_STATE_OFF; */
+  netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_AUTOIP, autoip);
+}
+
+/** Restart AutoIP client and check the next address (conflict detected)
+ *
+ * @param netif The netif under AutoIP control
+ */
+static void
+autoip_restart(struct netif *netif)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+  autoip->tried_llipaddr++;
+  autoip_start(netif);
+}
+
+/**
+ * Handle a IP address conflict after an ARP conflict detection
+ */
+static void
+autoip_handle_arp_conflict(struct netif *netif)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+
+  /* RFC3927, 2.5 "Conflict Detection and Defense" allows two options where
+     a) means retreat on the first conflict and
+     b) allows to keep an already configured address when having only one
+        conflict in 10 seconds
+     We use option b) since it helps to improve the chance that one of the two
+     conflicting hosts may be able to retain its address. */
+
+  if (autoip->lastconflict > 0) {
+    /* retreat, there was a conflicting ARP in the last DEFEND_INTERVAL seconds */
+    LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+                ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
+
+    /* Active TCP sessions are aborted when removing the ip addresss */
+    autoip_restart(netif);
+  } else {
+    LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+                ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
+    autoip_arp_announce(netif);
+    autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
+  }
+}
+
+/**
+ * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
+ *
+ * @param netif network interface on which create the IP-Address
+ * @param ipaddr ip address to initialize
+ */
+static void
+autoip_create_addr(struct netif *netif, ip4_addr_t *ipaddr)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+
+  /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
+   * compliant to RFC 3927 Section 2.1
+   * We have 254 * 256 possibilities */
+
+  u32_t addr = lwip_ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
+  addr += autoip->tried_llipaddr;
+  addr = AUTOIP_NET | (addr & 0xffff);
+  /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
+
+  if (addr < AUTOIP_RANGE_START) {
+    addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
+  }
+  if (addr > AUTOIP_RANGE_END) {
+    addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
+  }
+  LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
+              (addr <= AUTOIP_RANGE_END));
+  ip4_addr_set_u32(ipaddr, lwip_htonl(addr));
+
+  LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+              ("autoip_create_addr(): tried_llipaddr=%"U16_F", %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+               (u16_t)(autoip->tried_llipaddr), ip4_addr1_16(ipaddr), ip4_addr2_16(ipaddr),
+               ip4_addr3_16(ipaddr), ip4_addr4_16(ipaddr)));
+}
+
+/**
+ * Sends an ARP probe from a network interface
+ *
+ * @param netif network interface used to send the probe
+ */
+static err_t
+autoip_arp_probe(struct netif *netif)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+  /* this works because netif->ip_addr is ANY */
+  return etharp_request(netif, &autoip->llipaddr);
+}
+
+/**
+ * Sends an ARP announce from a network interface
+ *
+ * @param netif network interface used to send the announce
+ */
+static err_t
+autoip_arp_announce(struct netif *netif)
+{
+  return etharp_gratuitous(netif);
+}
+
+/**
+ * Configure interface for use with current LL IP-Address
+ *
+ * @param netif network interface to configure with current LL IP-Address
+ */
+static err_t
+autoip_bind(struct netif *netif)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+  ip4_addr_t sn_mask, gw_addr;
+
+  LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+              ("autoip_bind(netif=%p) %c%c%"U16_F" %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+               (void *)netif, netif->name[0], netif->name[1], (u16_t)netif->num,
+               ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
+               ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
+
+  IP4_ADDR(&sn_mask, 255, 255, 0, 0);
+  IP4_ADDR(&gw_addr, 0, 0, 0, 0);
+
+  netif_set_addr(netif, &autoip->llipaddr, &sn_mask, &gw_addr);
+  /* interface is used by routing now that an address is set */
+
+  return ERR_OK;
+}
+
+/**
+ * @ingroup autoip
+ * Start AutoIP client
+ *
+ * @param netif network interface on which start the AutoIP client
+ */
+err_t
+autoip_start(struct netif *netif)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+  err_t result = ERR_OK;
+
+  LWIP_ASSERT_CORE_LOCKED();
+  LWIP_ERROR("netif is not up, old style port?", netif_is_up(netif), return ERR_ARG;);
+
+  /* Set IP-Address, Netmask and Gateway to 0 to make sure that
+   * ARP Packets are formed correctly
+   */
+  netif_set_addr(netif, IP4_ADDR_ANY4, IP4_ADDR_ANY4, IP4_ADDR_ANY4);
+
+  LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+              ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void *)netif, netif->name[0],
+               netif->name[1], (u16_t)netif->num));
+  if (autoip == NULL) {
+    /* no AutoIP client attached yet? */
+    LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+                ("autoip_start(): starting new AUTOIP client\n"));
+    autoip = (struct autoip *)mem_calloc(1, sizeof(struct autoip));
+    if (autoip == NULL) {
+      LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+                  ("autoip_start(): could not allocate autoip\n"));
+      return ERR_MEM;
+    }
+    /* store this AutoIP client in the netif */
+    netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_AUTOIP, autoip);
+    LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
+  } else {
+    autoip->state = AUTOIP_STATE_OFF;
+    autoip->ttw = 0;
+    autoip->sent_num = 0;
+    ip4_addr_set_zero(&autoip->llipaddr);
+    autoip->lastconflict = 0;
+  }
+
+  autoip_create_addr(netif, &(autoip->llipaddr));
+  autoip_start_probing(netif);
+
+  return result;
+}
+
+static void
+autoip_start_probing(struct netif *netif)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+
+  autoip->state = AUTOIP_STATE_PROBING;
+  autoip->sent_num = 0;
+  LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+              ("autoip_start_probing(): changing state to PROBING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+               ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
+               ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
+
+  /* time to wait to first probe, this is randomly
+   * chosen out of 0 to PROBE_WAIT seconds.
+   * compliant to RFC 3927 Section 2.2.1
+   */
+  autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
+
+  /*
+   * if we tried more then MAX_CONFLICTS we must limit our rate for
+   * acquiring and probing address
+   * compliant to RFC 3927 Section 2.2.1
+   */
+  if (autoip->tried_llipaddr > MAX_CONFLICTS) {
+    autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
+  }
+}
+
+/**
+ * Handle a possible change in the network configuration.
+ *
+ * If there is an AutoIP address configured, take the interface down
+ * and begin probing with the same address.
+ */
+void
+autoip_network_changed(struct netif *netif)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+
+  if (autoip && (autoip->state != AUTOIP_STATE_OFF)) {
+    autoip_start_probing(netif);
+  }
+}
+
+/**
+ * @ingroup autoip
+ * Stop AutoIP client
+ *
+ * @param netif network interface on which stop the AutoIP client
+ */
+err_t
+autoip_stop(struct netif *netif)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+
+  LWIP_ASSERT_CORE_LOCKED();
+  if (autoip != NULL) {
+    autoip->state = AUTOIP_STATE_OFF;
+    if (ip4_addr_islinklocal(netif_ip4_addr(netif))) {
+      netif_set_addr(netif, IP4_ADDR_ANY4, IP4_ADDR_ANY4, IP4_ADDR_ANY4);
+    }
+  }
+  return ERR_OK;
+}
+
+/**
+ * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
+ */
+void
+autoip_tmr(void)
+{
+  struct netif *netif;
+  /* loop through netif's */
+  NETIF_FOREACH(netif) {
+    struct autoip *autoip = netif_autoip_data(netif);
+    /* only act on AutoIP configured interfaces */
+    if (autoip != NULL) {
+      if (autoip->lastconflict > 0) {
+        autoip->lastconflict--;
+      }
+
+      LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+                  ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
+                   (u16_t)(autoip->state), autoip->ttw));
+
+      if (autoip->ttw > 0) {
+        autoip->ttw--;
+      }
+
+      switch (autoip->state) {
+        case AUTOIP_STATE_PROBING:
+          if (autoip->ttw == 0) {
+            if (autoip->sent_num >= PROBE_NUM) {
+              /* Switch to ANNOUNCING: now we can bind to an IP address and use it */
+              autoip->state = AUTOIP_STATE_ANNOUNCING;
+              autoip_bind(netif);
+              /* autoip_bind() calls netif_set_addr(): this triggers a gratuitous ARP
+                 which counts as an announcement */
+              autoip->sent_num = 1;
+              autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
+              LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+                          ("autoip_tmr(): changing state to ANNOUNCING: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+                           ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
+                           ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
+            } else {
+              autoip_arp_probe(netif);
+              LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() PROBING Sent Probe\n"));
+              autoip->sent_num++;
+              if (autoip->sent_num == PROBE_NUM) {
+                /* calculate time to wait to for announce */
+                autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
+              } else {
+                /* calculate time to wait to next probe */
+                autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
+                                       ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
+                                      PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
+              }
+            }
+          }
+          break;
+
+        case AUTOIP_STATE_ANNOUNCING:
+          if (autoip->ttw == 0) {
+            autoip_arp_announce(netif);
+            LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_tmr() ANNOUNCING Sent Announce\n"));
+            autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
+            autoip->sent_num++;
+
+            if (autoip->sent_num >= ANNOUNCE_NUM) {
+              autoip->state = AUTOIP_STATE_BOUND;
+              autoip->sent_num = 0;
+              autoip->ttw = 0;
+              LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+                          ("autoip_tmr(): changing state to BOUND: %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+                           ip4_addr1_16(&autoip->llipaddr), ip4_addr2_16(&autoip->llipaddr),
+                           ip4_addr3_16(&autoip->llipaddr), ip4_addr4_16(&autoip->llipaddr)));
+            }
+          }
+          break;
+
+        default:
+          /* nothing to do in other states */
+          break;
+      }
+    }
+  }
+}
+
+/**
+ * Handles every incoming ARP Packet, called by etharp_input().
+ *
+ * @param netif network interface to use for autoip processing
+ * @param hdr Incoming ARP packet
+ */
+void
+autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+
+  LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_arp_reply()\n"));
+  if ((autoip != NULL) && (autoip->state != AUTOIP_STATE_OFF)) {
+    /* when ip.src == llipaddr && hw.src != netif->hwaddr
+     *
+     * when probing  ip.dst == llipaddr && hw.src != netif->hwaddr
+     * we have a conflict and must solve it
+     */
+    ip4_addr_t sipaddr, dipaddr;
+    struct eth_addr netifaddr;
+    SMEMCPY(netifaddr.addr, netif->hwaddr, ETH_HWADDR_LEN);
+
+    /* Copy struct ip4_addr_wordaligned to aligned ip4_addr, to support compilers without
+     * structure packing (not using structure copy which breaks strict-aliasing rules).
+     */
+    IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T(&sipaddr, &hdr->sipaddr);
+    IPADDR_WORDALIGNED_COPY_TO_IP4_ADDR_T(&dipaddr, &hdr->dipaddr);
+
+    if (autoip->state == AUTOIP_STATE_PROBING) {
+      /* RFC 3927 Section 2.2.1:
+       * from beginning to after ANNOUNCE_WAIT
+       * seconds we have a conflict if
+       * ip.src == llipaddr OR
+       * ip.dst == llipaddr && hw.src != own hwaddr
+       */
+      if ((ip4_addr_cmp(&sipaddr, &autoip->llipaddr)) ||
+          (ip4_addr_isany_val(sipaddr) &&
+           ip4_addr_cmp(&dipaddr, &autoip->llipaddr) &&
+           !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
+        LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
+                    ("autoip_arp_reply(): Probe Conflict detected\n"));
+        autoip_restart(netif);
+      }
+    } else {
+      /* RFC 3927 Section 2.5:
+       * in any state we have a conflict if
+       * ip.src == llipaddr && hw.src != own hwaddr
+       */
+      if (ip4_addr_cmp(&sipaddr, &autoip->llipaddr) &&
+          !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
+        LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | LWIP_DBG_LEVEL_WARNING,
+                    ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
+        autoip_handle_arp_conflict(netif);
+      }
+    }
+  }
+}
+
+/** check if AutoIP supplied netif->ip_addr
+ *
+ * @param netif the netif to check
+ * @return 1 if AutoIP supplied netif->ip_addr (state BOUND or ANNOUNCING),
+ *         0 otherwise
+ */
+u8_t
+autoip_supplied_address(const struct netif *netif)
+{
+  if ((netif != NULL) && (netif_autoip_data(netif) != NULL)) {
+    struct autoip *autoip = netif_autoip_data(netif);
+    return (autoip->state == AUTOIP_STATE_BOUND) || (autoip->state == AUTOIP_STATE_ANNOUNCING);
+  }
+  return 0;
+}
+
+u8_t
+autoip_accept_packet(struct netif *netif, const ip4_addr_t *addr)
+{
+  struct autoip *autoip = netif_autoip_data(netif);
+  return (autoip != NULL) && ip4_addr_cmp(addr, &(autoip->llipaddr));
+}
+
+#endif /* LWIP_IPV4 && LWIP_AUTOIP */
@@ -0,0 +1,404 @@
+/**
+ * @file
+ * ICMP - Internet Control Message Protocol
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+/* Some ICMP messages should be passed to the transport protocols. This
+   is not implemented. */
+
+#include "lwip/opt.h"
+
+#if LWIP_IPV4 && LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/icmp.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/ip.h"
+#include "lwip/def.h"
+#include "lwip/stats.h"
+
+#include <string.h>
+
+#ifdef LWIP_HOOK_FILENAME
+#include LWIP_HOOK_FILENAME
+#endif
+
+/** Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be
+ * used to modify and send a response packet (and to 1 if this is not the case,
+ * e.g. when link header is stripped off when receiving) */
+#ifndef LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
+#define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1
+#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
+
+/* The amount of data from the original packet to return in a dest-unreachable */
+#define ICMP_DEST_UNREACH_DATASIZE 8
+
+static void icmp_send_response(struct pbuf *p, u8_t type, u8_t code);
+
+/**
+ * Processes ICMP input packets, called from ip_input().
+ *
+ * Currently only processes icmp echo requests and sends
+ * out the echo response.
+ *
+ * @param p the icmp echo request packet, p->payload pointing to the icmp header
+ * @param inp the netif on which this packet was received
+ */
+void
+icmp_input(struct pbuf *p, struct netif *inp)
+{
+  u8_t type;
+#ifdef LWIP_DEBUG
+  u8_t code;
+#endif /* LWIP_DEBUG */
+  struct icmp_echo_hdr *iecho;
+  const struct ip_hdr *iphdr_in;
+  u16_t hlen;
+  const ip4_addr_t *src;
+
+  ICMP_STATS_INC(icmp.recv);
+  MIB2_STATS_INC(mib2.icmpinmsgs);
+
+  iphdr_in = ip4_current_header();
+  hlen = IPH_HL_BYTES(iphdr_in);
+  if (hlen < IP_HLEN) {
+    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short IP header (%"S16_F" bytes) received\n", hlen));
+    goto lenerr;
+  }
+  if (p->len < sizeof(u16_t) * 2) {
+    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len));
+    goto lenerr;
+  }
+
+  type = *((u8_t *)p->payload);
+#ifdef LWIP_DEBUG
+  code = *(((u8_t *)p->payload) + 1);
+  /* if debug is enabled but debug statement below is somehow disabled: */
+  LWIP_UNUSED_ARG(code);
+#endif /* LWIP_DEBUG */
+  switch (type) {
+    case ICMP_ER:
+      /* This is OK, echo reply might have been parsed by a raw PCB
+         (as obviously, an echo request has been sent, too). */
+      MIB2_STATS_INC(mib2.icmpinechoreps);
+      break;
+    case ICMP_ECHO:
+      MIB2_STATS_INC(mib2.icmpinechos);
+      src = ip4_current_dest_addr();
+      /* multicast destination address? */
+      if (ip4_addr_ismulticast(ip4_current_dest_addr())) {
+#if LWIP_MULTICAST_PING
+        /* For multicast, use address of receiving interface as source address */
+        src = netif_ip4_addr(inp);
+#else /* LWIP_MULTICAST_PING */
+        LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to multicast pings\n"));
+        goto icmperr;
+#endif /* LWIP_MULTICAST_PING */
+      }
+      /* broadcast destination address? */
+      if (ip4_addr_isbroadcast(ip4_current_dest_addr(), ip_current_netif())) {
+#if LWIP_BROADCAST_PING
+        /* For broadcast, use address of receiving interface as source address */
+        src = netif_ip4_addr(inp);
+#else /* LWIP_BROADCAST_PING */
+        LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to broadcast pings\n"));
+        goto icmperr;
+#endif /* LWIP_BROADCAST_PING */
+      }
+      LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
+      if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
+        LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
+        goto lenerr;
+      }
+#if CHECKSUM_CHECK_ICMP
+      IF__NETIF_CHECKSUM_ENABLED(inp, NETIF_CHECKSUM_CHECK_ICMP) {
+        if (inet_chksum_pbuf(p) != 0) {
+          LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo\n"));
+          pbuf_free(p);
+          ICMP_STATS_INC(icmp.chkerr);
+          MIB2_STATS_INC(mib2.icmpinerrors);
+          return;
+        }
+      }
+#endif
+#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
+      if (pbuf_add_header(p, hlen + PBUF_LINK_HLEN + PBUF_LINK_ENCAPSULATION_HLEN)) {
+        /* p is not big enough to contain link headers
+         * allocate a new one and copy p into it
+         */
+        struct pbuf *r;
+        u16_t alloc_len = (u16_t)(p->tot_len + hlen);
+        if (alloc_len < p->tot_len) {
+          LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: allocating new pbuf failed (tot_len overflow)\n"));
+          goto icmperr;
+        }
+        /* allocate new packet buffer with space for link headers */
+        r = pbuf_alloc(PBUF_LINK, alloc_len, PBUF_RAM);
+        if (r == NULL) {
+          LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: allocating new pbuf failed\n"));
+          goto icmperr;
+        }
+        if (r->len < hlen + sizeof(struct icmp_echo_hdr)) {
+          LWIP_DEBUGF(ICMP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("first pbuf cannot hold the ICMP header"));
+          pbuf_free(r);
+          goto icmperr;
+        }
+        /* copy the ip header */
+        MEMCPY(r->payload, iphdr_in, hlen);
+        /* switch r->payload back to icmp header (cannot fail) */
+        if (pbuf_remove_header(r, hlen)) {
+          LWIP_ASSERT("icmp_input: moving r->payload to icmp header failed\n", 0);
+          pbuf_free(r);
+          goto icmperr;
+        }
+        /* copy the rest of the packet without ip header */
+        if (pbuf_copy(r, p) != ERR_OK) {
+          LWIP_DEBUGF(ICMP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("icmp_input: copying to new pbuf failed"));
+          pbuf_free(r);
+          goto icmperr;
+        }
+        /* free the original p */
+        pbuf_free(p);
+        /* we now have an identical copy of p that has room for link headers */
+        p = r;
+      } else {
+        /* restore p->payload to point to icmp header (cannot fail) */
+        if (pbuf_remove_header(p, hlen + PBUF_LINK_HLEN + PBUF_LINK_ENCAPSULATION_HLEN)) {
+          LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
+          goto icmperr;
+        }
+      }
+#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
+      /* At this point, all checks are OK. */
+      /* We generate an answer by switching the dest and src ip addresses,
+       * setting the icmp type to ECHO_RESPONSE and updating the checksum. */
+      iecho = (struct icmp_echo_hdr *)p->payload;
+      if (pbuf_add_header(p, hlen)) {
+        LWIP_DEBUGF(ICMP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Can't move over header in packet"));
+      } else {
+        err_t ret;
+        struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
+        ip4_addr_copy(iphdr->src, *src);
+        ip4_addr_copy(iphdr->dest, *ip4_current_src_addr());
+        ICMPH_TYPE_SET(iecho, ICMP_ER);
+#if CHECKSUM_GEN_ICMP
+        IF__NETIF_CHECKSUM_ENABLED(inp, NETIF_CHECKSUM_GEN_ICMP) {
+          /* adjust the checksum */
+          if (iecho->chksum > PP_HTONS(0xffffU - (ICMP_ECHO << 8))) {
+            iecho->chksum = (u16_t)(iecho->chksum + PP_HTONS((u16_t)(ICMP_ECHO << 8)) + 1);
+          } else {
+            iecho->chksum = (u16_t)(iecho->chksum + PP_HTONS(ICMP_ECHO << 8));
+          }
+        }
+#if LWIP_CHECKSUM_CTRL_PER_NETIF
+        else {
+          iecho->chksum = 0;
+        }
+#endif /* LWIP_CHECKSUM_CTRL_PER_NETIF */
+#else /* CHECKSUM_GEN_ICMP */
+        iecho->chksum = 0;
+#endif /* CHECKSUM_GEN_ICMP */
+
+        /* Set the correct TTL and recalculate the header checksum. */
+        IPH_TTL_SET(iphdr, ICMP_TTL);
+        IPH_CHKSUM_SET(iphdr, 0);
+#if CHECKSUM_GEN_IP
+        IF__NETIF_CHECKSUM_ENABLED(inp, NETIF_CHECKSUM_GEN_IP) {
+          IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, hlen));
+        }
+#endif /* CHECKSUM_GEN_IP */
+
+        ICMP_STATS_INC(icmp.xmit);
+        /* increase number of messages attempted to send */
+        MIB2_STATS_INC(mib2.icmpoutmsgs);
+        /* increase number of echo replies attempted to send */
+        MIB2_STATS_INC(mib2.icmpoutechoreps);
+
+        /* send an ICMP packet */
+        ret = ip4_output_if(p, src, LWIP_IP_HDRINCL,
+                            ICMP_TTL, 0, IP_PROTO_ICMP, inp);
+        if (ret != ERR_OK) {
+          LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ip_output_if returned an error: %s\n", lwip_strerr(ret)));
+        }
+      }
+      break;
+    default:
+      if (type == ICMP_DUR) {
+        MIB2_STATS_INC(mib2.icmpindestunreachs);
+      } else if (type == ICMP_TE) {
+        MIB2_STATS_INC(mib2.icmpintimeexcds);
+      } else if (type == ICMP_PP) {
+        MIB2_STATS_INC(mib2.icmpinparmprobs);
+      } else if (type == ICMP_SQ) {
+        MIB2_STATS_INC(mib2.icmpinsrcquenchs);
+      } else if (type == ICMP_RD) {
+        MIB2_STATS_INC(mib2.icmpinredirects);
+      } else if (type == ICMP_TS) {
+        MIB2_STATS_INC(mib2.icmpintimestamps);
+      } else if (type == ICMP_TSR) {
+        MIB2_STATS_INC(mib2.icmpintimestampreps);
+      } else if (type == ICMP_AM) {
+        MIB2_STATS_INC(mib2.icmpinaddrmasks);
+      } else if (type == ICMP_AMR) {
+        MIB2_STATS_INC(mib2.icmpinaddrmaskreps);
+      }
+      LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n",
+                               (s16_t)type, (s16_t)code));
+      ICMP_STATS_INC(icmp.proterr);
+      ICMP_STATS_INC(icmp.drop);
+  }
+  pbuf_free(p);
+  return;
+lenerr:
+  pbuf_free(p);
+  ICMP_STATS_INC(icmp.lenerr);
+  MIB2_STATS_INC(mib2.icmpinerrors);
+  return;
+#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN || !LWIP_MULTICAST_PING || !LWIP_BROADCAST_PING
+icmperr:
+  pbuf_free(p);
+  ICMP_STATS_INC(icmp.err);
+  MIB2_STATS_INC(mib2.icmpinerrors);
+  return;
+#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN || !LWIP_MULTICAST_PING || !LWIP_BROADCAST_PING */
+}
+
+/**
+ * Send an icmp 'destination unreachable' packet, called from ip_input() if
+ * the transport layer protocol is unknown and from udp_input() if the local
+ * port is not bound.
+ *
+ * @param p the input packet for which the 'unreachable' should be sent,
+ *          p->payload pointing to the IP header
+ * @param t type of the 'unreachable' packet
+ */
+void
+icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
+{
+  MIB2_STATS_INC(mib2.icmpoutdestunreachs);
+  icmp_send_response(p, ICMP_DUR, t);
+}
+
+#if IP_FORWARD || IP_REASSEMBLY
+/**
+ * Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
+ *
+ * @param p the input packet for which the 'time exceeded' should be sent,
+ *          p->payload pointing to the IP header
+ * @param t type of the 'time exceeded' packet
+ */
+void
+icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
+{
+  MIB2_STATS_INC(mib2.icmpouttimeexcds);
+  icmp_send_response(p, ICMP_TE, t);
+}
+
+#endif /* IP_FORWARD || IP_REASSEMBLY */
+
+/**
+ * Send an icmp packet in response to an incoming packet.
+ *
+ * @param p the input packet for which the 'unreachable' should be sent,
+ *          p->payload pointing to the IP header
+ * @param type Type of the ICMP header
+ * @param code Code of the ICMP header
+ */
+static void
+icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
+{
+  struct pbuf *q;
+  struct ip_hdr *iphdr;
+  /* we can use the echo header here */
+  struct icmp_echo_hdr *icmphdr;
+  ip4_addr_t iphdr_src;
+  struct netif *netif;
+
+  /* increase number of messages attempted to send */
+  MIB2_STATS_INC(mib2.icmpoutmsgs);
+
+  /* ICMP header + IP header + 8 bytes of data */
+  q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE,
+                 PBUF_RAM);
+  if (q == NULL) {
+    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded: failed to allocate pbuf for ICMP packet.\n"));
+    MIB2_STATS_INC(mib2.icmpouterrors);
+    return;
+  }
+  LWIP_ASSERT("check that first pbuf can hold icmp message",
+              (q->len >= (sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE)));
+
+  iphdr = (struct ip_hdr *)p->payload;
+  LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded from "));
+  ip4_addr_debug_print_val(ICMP_DEBUG, iphdr->src);
+  LWIP_DEBUGF(ICMP_DEBUG, (" to "));
+  ip4_addr_debug_print_val(ICMP_DEBUG, iphdr->dest);
+  LWIP_DEBUGF(ICMP_DEBUG, ("\n"));
+
+  icmphdr = (struct icmp_echo_hdr *)q->payload;
+  icmphdr->type = type;
+  icmphdr->code = code;
+  icmphdr->id = 0;
+  icmphdr->seqno = 0;
+
+  /* copy fields from original packet */
+  SMEMCPY((u8_t *)q->payload + sizeof(struct icmp_echo_hdr), (u8_t *)p->payload,
+          IP_HLEN + ICMP_DEST_UNREACH_DATASIZE);
+
+  ip4_addr_copy(iphdr_src, iphdr->src);
+#ifdef LWIP_HOOK_IP4_ROUTE_SRC
+  {
+    ip4_addr_t iphdr_dst;
+    ip4_addr_copy(iphdr_dst, iphdr->dest);
+    netif = ip4_route_src(&iphdr_dst, &iphdr_src);
+  }
+#else
+  netif = ip4_route(&iphdr_src);
+#endif
+  if (netif != NULL) {
+    /* calculate checksum */
+    icmphdr->chksum = 0;
+#if CHECKSUM_GEN_ICMP
+    IF__NETIF_CHECKSUM_ENABLED(netif, NETIF_CHECKSUM_GEN_ICMP) {
+      icmphdr->chksum = inet_chksum(icmphdr, q->len);
+    }
+#endif
+    ICMP_STATS_INC(icmp.xmit);
+    ip4_output_if(q, NULL, &iphdr_src, ICMP_TTL, 0, IP_PROTO_ICMP, netif);
+  }
+  pbuf_free(q);
+}
+
+#endif /* LWIP_IPV4 && LWIP_ICMP */
@@ -0,0 +1,801 @@
+/**
+ * @file
+ * IGMP - Internet Group Management Protocol
+ *
+ * @defgroup igmp IGMP
+ * @ingroup ip4
+ * To be called from TCPIP thread
+ */
+
+/*
+ * Copyright (c) 2002 CITEL Technologies Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is a contribution to the lwIP TCP/IP stack.
+ * The Swedish Institute of Computer Science and Adam Dunkels
+ * are specifically granted permission to redistribute this
+ * source code.
+*/
+
+/*-------------------------------------------------------------
+Note 1)
+Although the rfc requires V1 AND V2 capability
+we will only support v2 since now V1 is very old (August 1989)
+V1 can be added if required
+
+a debug print and statistic have been implemented to
+show this up.
+-------------------------------------------------------------
+-------------------------------------------------------------
+Note 2)
+A query for a specific group address (as opposed to ALLHOSTS)
+has now been implemented as I am unsure if it is required
+
+a debug print and statistic have been implemented to
+show this up.
+-------------------------------------------------------------
+-------------------------------------------------------------
+Note 3)
+The router alert rfc 2113 is implemented in outgoing packets
+but not checked rigorously incoming
+-------------------------------------------------------------
+Steve Reynolds
+------------------------------------------------------------*/
+
+/*-----------------------------------------------------------------------------
+ * RFC 988  - Host extensions for IP multicasting                         - V0
+ * RFC 1054 - Host extensions for IP multicasting                         -
+ * RFC 1112 - Host extensions for IP multicasting                         - V1
+ * RFC 2236 - Internet Group Management Protocol, Version 2               - V2  <- this code is based on this RFC (it's the "de facto" standard)
+ * RFC 3376 - Internet Group Management Protocol, Version 3               - V3
+ * RFC 4604 - Using Internet Group Management Protocol Version 3...       - V3+
+ * RFC 2113 - IP Router Alert Option                                      -
+ *----------------------------------------------------------------------------*/
+
+/*-----------------------------------------------------------------------------
+ * Includes
+ *----------------------------------------------------------------------------*/
+
+#include "lwip/opt.h"
+
+#if LWIP_IPV4 && LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/igmp.h"
+#include "lwip/debug.h"
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/ip.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/netif.h"
+#include "lwip/stats.h"
+#include "lwip/prot/igmp.h"
+
+#include <string.h>
+
+static struct igmp_group *igmp_lookup_group(struct netif *ifp, const ip4_addr_t *addr);
+static err_t  igmp_remove_group(struct netif *netif, struct igmp_group *group);
+static void   igmp_timeout(struct netif *netif, struct igmp_group *group);
+static void   igmp_start_timer(struct igmp_group *group, u8_t max_time);
+static void   igmp_delaying_member(struct igmp_group *group, u8_t maxresp);
+static err_t  igmp_ip_output_if(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest, struct netif *netif);
+static void   igmp_send(struct netif *netif, struct igmp_group *group, u8_t type);
+
+static ip4_addr_t     allsystems;
+static ip4_addr_t     allrouters;
+
+/**
+ * Initialize the IGMP module
+ */
+void
+igmp_init(void)
+{
+  LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
+
+  IP4_ADDR(&allsystems, 224, 0, 0, 1);
+  IP4_ADDR(&allrouters, 224, 0, 0, 2);
+}
+
+/**
+ * Start IGMP processing on interface
+ *
+ * @param netif network interface on which start IGMP processing
+ */
+err_t
+igmp_start(struct netif *netif)
+{
+  struct igmp_group *group;
+
+  LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", (void *)netif));
+
+  group = igmp_lookup_group(netif, &allsystems);
+
+  if (group != NULL) {
+    group->group_state = IGMP_GROUP_IDLE_MEMBER;
+    group->use++;
+
+    /* Allow the igmp messages at the MAC level */
+    if (netif->igmp_mac_filter != NULL) {
+      LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
+      ip4_addr_debug_print_val(IGMP_DEBUG, allsystems);
+      LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", (void *)netif));
+      netif->igmp_mac_filter(netif, &allsystems, NETIF_ADD_MAC_FILTER);
+    }
+
+    return ERR_OK;
+  }
+
+  return ERR_MEM;
+}
+
+/**
+ * Stop IGMP processing on interface
+ *
+ * @param netif network interface on which stop IGMP processing
+ */
+err_t
+igmp_stop(struct netif *netif)
+{
+  struct igmp_group *group = netif_igmp_data(netif);
+
+  netif_set_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_IGMP, NULL);
+
+  while (group != NULL) {
+    struct igmp_group *next = group->next; /* avoid use-after-free below */
+
+    /* disable the group at the MAC level */
+    if (netif->igmp_mac_filter != NULL) {
+      LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
+      ip4_addr_debug_print_val(IGMP_DEBUG, group->group_address);
+      LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", (void *)netif));
+      netif->igmp_mac_filter(netif, &(group->group_address), NETIF_DEL_MAC_FILTER);
+    }
+
+    /* free group */
+    memp_free(MEMP_IGMP_GROUP, group);
+
+    /* move to "next" */
+    group = next;
+  }
+  return ERR_OK;
+}
+
+/**
+ * Report IGMP memberships for this interface
+ *
+ * @param netif network interface on which report IGMP memberships
+ */
+void
+igmp_report_groups(struct netif *netif)
+{
+  struct igmp_group *group = netif_igmp_data(netif);
+
+  LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", (void *)netif));
+
+  /* Skip the first group in the list, it is always the allsystems group added in igmp_start() */
+  if (group != NULL) {
+    group = group->next;
+  }
+
+  while (group != NULL) {
+    igmp_delaying_member(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
+    group = group->next;
+  }
+}
+
+/**
+ * Search for a group in the netif's igmp group list
+ *
+ * @param ifp the network interface for which to look
+ * @param addr the group ip address to search for
+ * @return a struct igmp_group* if the group has been found,
+ *         NULL if the group wasn't found.
+ */
+struct igmp_group *
+igmp_lookfor_group(struct netif *ifp, const ip4_addr_t *addr)
+{
+  struct igmp_group *group = netif_igmp_data(ifp);
+
+  while (group != NULL) {
+    if (ip4_addr_cmp(&(group->group_address), addr)) {
+      return group;
+    }
+    group = group->next;
+  }
+
+  /* to be clearer, we return NULL here instead of
+   * 'group' (which is also NULL at this point).
+   */
+  return NULL;
+}
+
+/**
+ * Search for a specific igmp group and create a new one if not found-
+ *
+ * @param ifp the network interface for which to look
+ * @param addr the group ip address to search
+ * @return a struct igmp_group*,
+ *         NULL on memory error.
+ */
+static struct igmp_group *
+igmp_lookup_group(struct netif *ifp, const ip4_addr_t *addr)
+{
+  struct igmp_group *group;
+  struct igmp_group *list_head = netif_igmp_data(ifp);
+
+  /* Search if the group already exists */
+  group = igmp_lookfor_group(ifp, addr);
+  if (group != NULL) {
+    /* Group already exists. */
+    return group;
+  }
+
+  /* Group doesn't exist yet, create a new one */
+  group = (struct igmp_group *)memp_malloc(MEMP_IGMP_GROUP);
+  if (group != NULL) {
+    ip4_addr_set(&(group->group_address), addr);
+    group->timer              = 0; /* Not running */
+    group->group_state        = IGMP_GROUP_NON_MEMBER;
+    group->last_reporter_flag = 0;
+    group->use                = 0;
+
+    /* Ensure allsystems group is always first in list */
+    if (list_head == NULL) {
+      /* this is the first entry in linked list */
+      LWIP_ASSERT("igmp_lookup_group: first group must be allsystems",
+                  (ip4_addr_cmp(addr, &allsystems) != 0));
+      group->next = NULL;
+      netif_set_client_data(ifp, LWIP_NETIF_CLIENT_DATA_INDEX_IGMP, group);
+    } else {
+      /* append _after_ first entry */
+      LWIP_ASSERT("igmp_lookup_group: all except first group must not be allsystems",
+                  (ip4_addr_cmp(addr, &allsystems) == 0));
+      group->next = list_head->next;
+      list_head->next = group;
+    }
+  }
+
+  LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group ? "" : "impossible to ")));
+  ip4_addr_debug_print(IGMP_DEBUG, addr);
+  LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", (void *)ifp));
+
+  return group;
+}
+
+/**
+ * Remove a group from netif's igmp group list, but don't free it yet
+ *
+ * @param group the group to remove from the netif's igmp group list
+ * @return ERR_OK if group was removed from the list, an err_t otherwise
+ */
+static err_t
+igmp_remove_group(struct netif *netif, struct igmp_group *group)
+{
+  err_t err = ERR_OK;
+  struct igmp_group *tmp_group;
+
+  /* Skip the first group in the list, it is always the allsystems group added in igmp_start() */
+  for (tmp_group = netif_igmp_data(netif); tmp_group != NULL; tmp_group = tmp_group->next) {
+    if (tmp_group->next == group) {
+      tmp_group->next = group->next;
+      break;
+    }
+  }
+  /* Group not found in netif's igmp group list */
+  if (tmp_group == NULL) {
+    err = ERR_ARG;
+  }
+
+  return err;
+}
+
+/**
+ * Called from ip_input() if a new IGMP packet is received.
+ *
+ * @param p received igmp packet, p->payload pointing to the igmp header
+ * @param inp network interface on which the packet was received
+ * @param dest destination ip address of the igmp packet
+ */
+void
+igmp_input(struct pbuf *p, struct netif *inp, const ip4_addr_t *dest)
+{
+  struct igmp_msg   *igmp;
+  struct igmp_group *group;
+  struct igmp_group *groupref;
+
+  IGMP_STATS_INC(igmp.recv);
+
+  /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
+  if (p->len < IGMP_MINLEN) {
+    pbuf_free(p);
+    IGMP_STATS_INC(igmp.lenerr);
+    LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
+    return;
+  }
+
+  LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
+  ip4_addr_debug_print_val(IGMP_DEBUG, ip4_current_header()->src);
+  LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
+  ip4_addr_debug_print_val(IGMP_DEBUG, ip4_current_header()->dest);
+  LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", (void *)inp));
+
+  /* Now calculate and check the checksum */
+  igmp = (struct igmp_msg *)p->payload;
+  if (inet_chksum(igmp, p->len)) {
+    pbuf_free(p);
+    IGMP_STATS_INC(igmp.chkerr);
+    LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
+    return;
+  }
+
+  /* Packet is ok so find an existing group */
+  group = igmp_lookfor_group(inp, dest); /* use the destination IP address of incoming packet */
+
+  /* If group can be found or create... */
+  if (!group) {
+    pbuf_free(p);
+    IGMP_STATS_INC(igmp.drop);
+    LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
+    return;
+  }
+
+  /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
+  switch (igmp->igmp_msgtype) {
+    case IGMP_MEMB_QUERY:
+      /* IGMP_MEMB_QUERY to the "all systems" address ? */
+      if ((ip4_addr_cmp(dest, &allsystems)) && ip4_addr_isany(&igmp->igmp_group_address)) {
+        /* THIS IS THE GENERAL QUERY */
+        LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
+
+        if (igmp->igmp_maxresp == 0) {
+          IGMP_STATS_INC(igmp.rx_v1);
+          LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
+          igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
+        } else {
+          IGMP_STATS_INC(igmp.rx_general);
+        }
+
+        groupref = netif_igmp_data(inp);
+
+        /* Do not send messages on the all systems group address! */
+        /* Skip the first group in the list, it is always the allsystems group added in igmp_start() */
+        if (groupref != NULL) {
+          groupref = groupref->next;
+        }
+
+        while (groupref) {
+          igmp_delaying_member(groupref, igmp->igmp_maxresp);
+          groupref = groupref->next;
+        }
+      } else {
+        /* IGMP_MEMB_QUERY to a specific group ? */
+        if (!ip4_addr_isany(&igmp->igmp_group_address)) {
+          LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
+          ip4_addr_debug_print_val(IGMP_DEBUG, igmp->igmp_group_address);
+          if (ip4_addr_cmp(dest, &allsystems)) {
+            ip4_addr_t groupaddr;
+            LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
+            /* we first need to re-look for the group since we used dest last time */
+            ip4_addr_copy(groupaddr, igmp->igmp_group_address);
+            group = igmp_lookfor_group(inp, &groupaddr);
+          } else {
+            LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
+          }
+
+          if (group != NULL) {
+            IGMP_STATS_INC(igmp.rx_group);
+            igmp_delaying_member(group, igmp->igmp_maxresp);
+          } else {
+            IGMP_STATS_INC(igmp.drop);
+          }
+        } else {
+          IGMP_STATS_INC(igmp.proterr);
+        }
+      }
+      break;
+    case IGMP_V2_MEMB_REPORT:
+      LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
+      IGMP_STATS_INC(igmp.rx_report);
+      if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
+        /* This is on a specific group we have already looked up */
+        group->timer = 0; /* stopped */
+        group->group_state = IGMP_GROUP_IDLE_MEMBER;
+        group->last_reporter_flag = 0;
+      }
+      break;
+    default:
+      LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
+                               igmp->igmp_msgtype, group->group_state, (void *)&group, (void *)inp));
+      IGMP_STATS_INC(igmp.proterr);
+      break;
+  }
+
+  pbuf_free(p);
+  return;
+}
+
+/**
+ * @ingroup igmp
+ * Join a group on one network interface.
+ *
+ * @param ifaddr ip address of the network interface which should join a new group
+ * @param groupaddr the ip address of the group which to join
+ * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
+ */
+err_t
+igmp_joingroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr)
+{
+  err_t err = ERR_VAL; /* no matching interface */
+  struct netif *netif;
+
+  LWIP_ASSERT_CORE_LOCKED();
+
+  /* make sure it is multicast address */
+  LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip4_addr_ismulticast(groupaddr), return ERR_VAL;);
+  LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip4_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
+
+  /* loop through netif's */
+  NETIF_FOREACH(netif) {
+    /* Should we join this interface ? */
+    if ((netif->flags & NETIF_FLAG_IGMP) && ((ip4_addr_isany(ifaddr) || ip4_addr_cmp(netif_ip4_addr(netif), ifaddr)))) {
+      err = igmp_joingroup_netif(netif, groupaddr);
+      if (err != ERR_OK) {
+        /* Return an error even if some network interfaces are joined */
+        /** @todo undo any other netif already joined */
+        return err;
+      }
+    }
+  }
+
+  return err;
+}
+
+/**
+ * @ingroup igmp
+ * Join a group on one network interface.
+ *
+ * @param netif the network interface which should join a new group
+ * @param groupaddr the ip address of the group which to join
+ * @return ERR_OK if group was joined on the netif, an err_t otherwise
+ */
+err_t
+igmp_joingroup_netif(struct netif *netif, const ip4_addr_t *groupaddr)
+{
+  struct igmp_group *group;
+
+  LWIP_ASSERT_CORE_LOCKED();
+
+  /* make sure it is multicast address */
+  LWIP_ERROR("igmp_joingroup_netif: attempt to join non-multicast address", ip4_addr_ismulticast(groupaddr), return ERR_VAL;);
+  LWIP_ERROR("igmp_joingroup_netif: attempt to join allsystems address", (!ip4_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
+
+  /* make sure it is an igmp-enabled netif */
+  LWIP_ERROR("igmp_joingroup_netif: attempt to join on non-IGMP netif", netif->flags & NETIF_FLAG_IGMP, return ERR_VAL;);
+
+  /* find group or create a new one if not found */
+  group = igmp_lookup_group(netif, groupaddr);
+
+  if (group != NULL) {
+    /* This should create a new group, check the state to make sure */
+    if (group->group_state != IGMP_GROUP_NON_MEMBER) {
+      LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup_netif: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
+    } else {
+      /* OK - it was new group */
+      LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup_netif: join to new group: "));
+      ip4_addr_debug_print(IGMP_DEBUG, groupaddr);
+      LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+
+      /* If first use of the group, allow the group at the MAC level */
+      if ((group->use == 0) && (netif->igmp_mac_filter != NULL)) {
+        LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup_netif: igmp_mac_filter(ADD "));
+        ip4_addr_debug_print(IGMP_DEBUG, groupaddr);
+        LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", (void *)netif));
+        netif->igmp_mac_filter(netif, groupaddr, NETIF_ADD_MAC_FILTER);
+      }
+
+      IGMP_STATS_INC(igmp.tx_join);
+      igmp_send(netif, group, IGMP_V2_MEMB_REPORT);
+
+      igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
+
+      /* Need to work out where this timer comes from */
+      group->group_state = IGMP_GROUP_DELAYING_MEMBER;
+    }
+    /* Increment group use */
+    group->use++;
+    /* Join on this interface */
+    return ERR_OK;
+  } else {
+    LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup_netif: Not enough memory to join to group\n"));
+    return ERR_MEM;
+  }
+}
+
+/**
+ * @ingroup igmp
+ * Leave a group on one network interface.
+ *
+ * @param ifaddr ip address of the network interface which should leave a group
+ * @param groupaddr the ip address of the group which to leave
+ * @return ERR_OK if group was left on the netif(s), an err_t otherwise
+ */
+err_t
+igmp_leavegroup(const ip4_addr_t *ifaddr, const ip4_addr_t *groupaddr)
+{
+  err_t err = ERR_VAL; /* no matching interface */
+  struct netif *netif;
+
+  LWIP_ASSERT_CORE_LOCKED();
+
+  /* make sure it is multicast address */
+  LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip4_addr_ismulticast(groupaddr), return ERR_VAL;);
+  LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip4_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
+
+  /* loop through netif's */
+  NETIF_FOREACH(netif) {
+    /* Should we leave this interface ? */
+    if ((netif->flags & NETIF_FLAG_IGMP) && ((ip4_addr_isany(ifaddr) || ip4_addr_cmp(netif_ip4_addr(netif), ifaddr)))) {
+      err_t res = igmp_leavegroup_netif(netif, groupaddr);
+      if (err != ERR_OK) {
+        /* Store this result if we have not yet gotten a success */
+        err = res;
+      }
+    }
+  }
+
+  return err;
+}
+
+/**
+ * @ingroup igmp
+ * Leave a group on one network interface.
+ *
+ * @param netif the network interface which should leave a group
+ * @param groupaddr the ip address of the group which to leave
+ * @return ERR_OK if group was left on the netif, an err_t otherwise
+ */
+err_t
+igmp_leavegroup_netif(struct netif *netif, const ip4_addr_t *groupaddr)
+{
+  struct igmp_group *group;
+
+  LWIP_ASSERT_CORE_LOCKED();
+
+  /* make sure it is multicast address */
+  LWIP_ERROR("igmp_leavegroup_netif: attempt to leave non-multicast address", ip4_addr_ismulticast(groupaddr), return ERR_VAL;);
+  LWIP_ERROR("igmp_leavegroup_netif: attempt to leave allsystems address", (!ip4_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
+
+  /* make sure it is an igmp-enabled netif */
+  LWIP_ERROR("igmp_leavegroup_netif: attempt to leave on non-IGMP netif", netif->flags & NETIF_FLAG_IGMP, return ERR_VAL;);
+
+  /* find group */
+  group = igmp_lookfor_group(netif, groupaddr);
+
+  if (group != NULL) {
+    /* Only send a leave if the flag is set according to the state diagram */
+    LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup_netif: Leaving group: "));
+    ip4_addr_debug_print(IGMP_DEBUG, groupaddr);
+    LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+
+    /* If there is no other use of the group */
+    if (group->use <= 1) {
+      /* Remove the group from the list */
+      igmp_remove_group(netif, group);
+
+      /* If we are the last reporter for this group */
+      if (group->last_reporter_flag) {
+        LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup_netif: sending leaving group\n"));
+        IGMP_STATS_INC(igmp.tx_leave);
+        igmp_send(netif, group, IGMP_LEAVE_GROUP);
+      }
+
+      /* Disable the group at the MAC level */
+      if (netif->igmp_mac_filter != NULL) {
+        LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup_netif: igmp_mac_filter(DEL "));
+        ip4_addr_debug_print(IGMP_DEBUG, groupaddr);
+        LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", (void *)netif));
+        netif->igmp_mac_filter(netif, groupaddr, NETIF_DEL_MAC_FILTER);
+      }
+
+      /* Free group struct */
+      memp_free(MEMP_IGMP_GROUP, group);
+    } else {
+      /* Decrement group use */
+      group->use--;
+    }
+    return ERR_OK;
+  } else {
+    LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup_netif: not member of group\n"));
+    return ERR_VAL;
+  }
+}
+
+/**
+ * The igmp timer function (both for NO_SYS=1 and =0)
+ * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
+ */
+void
+igmp_tmr(void)
+{
+  struct netif *netif;
+
+  NETIF_FOREACH(netif) {
+    struct igmp_group *group = netif_igmp_data(netif);
+
+    while (group != NULL) {
+      if (group->timer > 0) {
+        group->timer--;
+        if (group->timer == 0) {
+          igmp_timeout(netif, group);
+        }
+      }
+      group = group->next;
+    }
+  }
+}
+
+/**
+ * Called if a timeout for one group is reached.
+ * Sends a report for this group.
+ *
+ * @param group an igmp_group for which a timeout is reached
+ */
+static void
+igmp_timeout(struct netif *netif, struct igmp_group *group)
+{
+  /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group
+     (unless it is the allsystems group) */
+  if ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
+      (!(ip4_addr_cmp(&(group->group_address), &allsystems)))) {
+    LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
+    ip4_addr_debug_print_val(IGMP_DEBUG, group->group_address);
+    LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", (void *)netif));
+
+    group->group_state = IGMP_GROUP_IDLE_MEMBER;
+
+    IGMP_STATS_INC(igmp.tx_report);
+    igmp_send(netif, group, IGMP_V2_MEMB_REPORT);
+  }
+}
+
+/**
+ * Start a timer for an igmp group
+ *
+ * @param group the igmp_group for which to start a timer
+ * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
+ *        every call to igmp_tmr())
+ */
+static void
+igmp_start_timer(struct igmp_group *group, u8_t max_time)
+{
+#ifdef LWIP_RAND
+  group->timer = (u16_t)(max_time > 2 ? (LWIP_RAND() % max_time) : 1);
+#else /* LWIP_RAND */
+  /* ATTENTION: use this only if absolutely necessary! */
+  group->timer = max_time / 2;
+#endif /* LWIP_RAND */
+
+  if (group->timer == 0) {
+    group->timer = 1;
+  }
+}
+
+/**
+ * Delaying membership report for a group if necessary
+ *
+ * @param group the igmp_group for which "delaying" membership report
+ * @param maxresp query delay
+ */
+static void
+igmp_delaying_member(struct igmp_group *group, u8_t maxresp)
+{
+  if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
+      ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) &&
+       ((group->timer == 0) || (maxresp < group->timer)))) {
+    igmp_start_timer(group, maxresp);
+    group->group_state = IGMP_GROUP_DELAYING_MEMBER;
+  }
+}
+
+
+/**
+ * Sends an IP packet on a network interface. This function constructs the IP header
+ * and calculates the IP header checksum. If the source IP address is NULL,
+ * the IP address of the outgoing network interface is filled in as source address.
+ *
+ * @param p the packet to send (p->payload points to the data, e.g. next
+            protocol header; if dest == LWIP_IP_HDRINCL, p already includes an
+            IP header and p->payload points to that IP header)
+ * @param src the source IP address to send from (if src == IP4_ADDR_ANY, the
+ *         IP  address of the netif used to send is used as source address)
+ * @param dest the destination IP address to send the packet to
+ * @param netif the netif on which to send this packet
+ * @return ERR_OK if the packet was sent OK
+ *         ERR_BUF if p doesn't have enough space for IP/LINK headers
+ *         returns errors returned by netif->output
+ */
+static err_t
+igmp_ip_output_if(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest, struct netif *netif)
+{
+  /* This is the "router alert" option */
+  u16_t ra[2];
+  ra[0] = PP_HTONS(ROUTER_ALERT);
+  ra[1] = 0x0000; /* Router shall examine packet */
+  IGMP_STATS_INC(igmp.xmit);
+  return ip4_output_if_opt(p, src, dest, IGMP_TTL, 0, IP_PROTO_IGMP, netif, ra, ROUTER_ALERTLEN);
+}
+
+/**
+ * Send an igmp packet to a specific group.
+ *
+ * @param group the group to which to send the packet
+ * @param type the type of igmp packet to send
+ */
+static void
+igmp_send(struct netif *netif, struct igmp_group *group, u8_t type)
+{
+  struct pbuf     *p    = NULL;
+  struct igmp_msg *igmp = NULL;
+  ip4_addr_t   src  = *IP4_ADDR_ANY4;
+  ip4_addr_t  *dest = NULL;
+
+  /* IP header + "router alert" option + IGMP header */
+  p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
+
+  if (p) {
+    igmp = (struct igmp_msg *)p->payload;
+    LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
+                (p->len >= sizeof(struct igmp_msg)));
+    ip4_addr_copy(src, *netif_ip4_addr(netif));
+
+    if (type == IGMP_V2_MEMB_REPORT) {
+      dest = &(group->group_address);
+      ip4_addr_copy(igmp->igmp_group_address, group->group_address);
+      group->last_reporter_flag = 1; /* Remember we were the last to report */
+    } else {
+      if (type == IGMP_LEAVE_GROUP) {
+        dest = &allrouters;
+        ip4_addr_copy(igmp->igmp_group_address, group->group_address);
+      }
+    }
+
+    if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
+      igmp->igmp_msgtype  = type;
+      igmp->igmp_maxresp  = 0;
+      igmp->igmp_checksum = 0;
+      igmp->igmp_checksum = inet_chksum(igmp, IGMP_MINLEN);
+
+      igmp_ip_output_if(p, &src, dest, netif);
+    }
+
+    pbuf_free(p);
+  } else {
+    LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
+    IGMP_STATS_INC(igmp.memerr);
+  }
+}
+
+#endif /* LWIP_IPV4 && LWIP_IGMP */
@@ -0,0 +1,321 @@
+/**
+ * @file
+ * This is the IPv4 address tools implementation.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_IPV4
+
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+
+/* used by IP4_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
+const ip_addr_t ip_addr_any = IPADDR4_INIT(IPADDR_ANY);
+const ip_addr_t ip_addr_broadcast = IPADDR4_INIT(IPADDR_BROADCAST);
+
+/**
+ * Determine if an address is a broadcast address on a network interface
+ *
+ * @param addr address to be checked
+ * @param netif the network interface against which the address is checked
+ * @return returns non-zero if the address is a broadcast address
+ */
+u8_t
+ip4_addr_isbroadcast_u32(u32_t addr, const struct netif *netif)
+{
+  ip4_addr_t ipaddr;
+  ip4_addr_set_u32(&ipaddr, addr);
+
+  /* all ones (broadcast) or all zeroes (old skool broadcast) */
+  if ((~addr == IPADDR_ANY) ||
+      (addr == IPADDR_ANY)) {
+    return 1;
+    /* no broadcast support on this network interface? */
+  } else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0) {
+    /* the given address cannot be a broadcast address
+     * nor can we check against any broadcast addresses */
+    return 0;
+    /* address matches network interface address exactly? => no broadcast */
+  } else if (addr == ip4_addr_get_u32(netif_ip4_addr(netif))) {
+    return 0;
+    /*  on the same (sub) network... */
+  } else if (ip4_addr_netcmp(&ipaddr, netif_ip4_addr(netif), netif_ip4_netmask(netif))
+             /* ...and host identifier bits are all ones? =>... */
+             && ((addr & ~ip4_addr_get_u32(netif_ip4_netmask(netif))) ==
+                 (IPADDR_BROADCAST & ~ip4_addr_get_u32(netif_ip4_netmask(netif))))) {
+    /* => network broadcast address */
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
+/** Checks if a netmask is valid (starting with ones, then only zeros)
+ *
+ * @param netmask the IPv4 netmask to check (in network byte order!)
+ * @return 1 if the netmask is valid, 0 if it is not
+ */
+u8_t
+ip4_addr_netmask_valid(u32_t netmask)
+{
+  u32_t mask;
+  u32_t nm_hostorder = lwip_htonl(netmask);
+
+  /* first, check for the first zero */
+  for (mask = 1UL << 31 ; mask != 0; mask >>= 1) {
+    if ((nm_hostorder & mask) == 0) {
+      break;
+    }
+  }
+  /* then check that there is no one */
+  for (; mask != 0; mask >>= 1) {
+    if ((nm_hostorder & mask) != 0) {
+      /* there is a one after the first zero -> invalid */
+      return 0;
+    }
+  }
+  /* no one after the first zero -> valid */
+  return 1;
+}
+
+/**
+ * Ascii internet address interpretation routine.
+ * The value returned is in network order.
+ *
+ * @param cp IP address in ascii representation (e.g. "127.0.0.1")
+ * @return ip address in network order
+ */
+u32_t
+ipaddr_addr(const char *cp)
+{
+  ip4_addr_t val;
+
+  if (ip4addr_aton(cp, &val)) {
+    return ip4_addr_get_u32(&val);
+  }
+  return (IPADDR_NONE);
+}
+
+/**
+ * Check whether "cp" is a valid ascii representation
+ * of an Internet address and convert to a binary address.
+ * Returns 1 if the address is valid, 0 if not.
+ * This replaces inet_addr, the return value from which
+ * cannot distinguish between failure and a local broadcast address.
+ *
+ * @param cp IP address in ascii representation (e.g. "127.0.0.1")
+ * @param addr pointer to which to save the ip address in network order
+ * @return 1 if cp could be converted to addr, 0 on failure
+ */
+int
+ip4addr_aton(const char *cp, ip4_addr_t *addr)
+{
+  u32_t val;
+  u8_t base;
+  char c;
+  u32_t parts[4];
+  u32_t *pp = parts;
+
+  c = *cp;
+  for (;;) {
+    /*
+     * Collect number up to ``.''.
+     * Values are specified as for C:
+     * 0x=hex, 0=octal, 1-9=decimal.
+     */
+    if (!lwip_isdigit(c)) {
+      return 0;
+    }
+    val = 0;
+    base = 10;
+    if (c == '0') {
+      c = *++cp;
+      if (c == 'x' || c == 'X') {
+        base = 16;
+        c = *++cp;
+      } else {
+        base = 8;
+      }
+    }
+    for (;;) {
+      if (lwip_isdigit(c)) {
+        val = (val * base) + (u32_t)(c - '0');
+        c = *++cp;
+      } else if (base == 16 && lwip_isxdigit(c)) {
+        val = (val << 4) | (u32_t)(c + 10 - (lwip_islower(c) ? 'a' : 'A'));
+        c = *++cp;
+      } else {
+        break;
+      }
+    }
+    if (c == '.') {
+      /*
+       * Internet format:
+       *  a.b.c.d
+       *  a.b.c   (with c treated as 16 bits)
+       *  a.b (with b treated as 24 bits)
+       */
+      if (pp >= parts + 3) {
+        return 0;
+      }
+      *pp++ = val;
+      c = *++cp;
+    } else {
+      break;
+    }
+  }
+  /*
+   * Check for trailing characters.
+   */
+  if (c != '\0' && !lwip_isspace(c)) {
+    return 0;
+  }
+  /*
+   * Concoct the address according to
+   * the number of parts specified.
+   */
+  switch (pp - parts + 1) {
+
+    case 0:
+      return 0;       /* initial nondigit */
+
+    case 1:             /* a -- 32 bits */
+      break;
+
+    case 2:             /* a.b -- 8.24 bits */
+      if (val > 0xffffffUL) {
+        return 0;
+      }
+      if (parts[0] > 0xff) {
+        return 0;
+      }
+      val |= parts[0] << 24;
+      break;
+
+    case 3:             /* a.b.c -- 8.8.16 bits */
+      if (val > 0xffff) {
+        return 0;
+      }
+      if ((parts[0] > 0xff) || (parts[1] > 0xff)) {
+        return 0;
+      }
+      val |= (parts[0] << 24) | (parts[1] << 16);
+      break;
+
+    case 4:             /* a.b.c.d -- 8.8.8.8 bits */
+      if (val > 0xff) {
+        return 0;
+      }
+      if ((parts[0] > 0xff) || (parts[1] > 0xff) || (parts[2] > 0xff)) {
+        return 0;
+      }
+      val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+      break;
+    default:
+      LWIP_ASSERT("unhandled", 0);
+      break;
+  }
+  if (addr) {
+    ip4_addr_set_u32(addr, lwip_htonl(val));
+  }
+  return 1;
+}
+
+/**
+ * Convert numeric IP address into decimal dotted ASCII representation.
+ * returns ptr to static buffer; not reentrant!
+ *
+ * @param addr ip address in network order to convert
+ * @return pointer to a global static (!) buffer that holds the ASCII
+ *         representation of addr
+ */
+char *
+ip4addr_ntoa(const ip4_addr_t *addr)
+{
+  static char str[IP4ADDR_STRLEN_MAX];
+  return ip4addr_ntoa_r(addr, str, IP4ADDR_STRLEN_MAX);
+}
+
+/**
+ * Same as ip4addr_ntoa, but reentrant since a user-supplied buffer is used.
+ *
+ * @param addr ip address in network order to convert
+ * @param buf target buffer where the string is stored
+ * @param buflen length of buf
+ * @return either pointer to buf which now holds the ASCII
+ *         representation of addr or NULL if buf was too small
+ */
+char *
+ip4addr_ntoa_r(const ip4_addr_t *addr, char *buf, int buflen)
+{
+  u32_t s_addr;
+  char inv[3];
+  char *rp;
+  u8_t *ap;
+  u8_t rem;
+  u8_t n;
+  u8_t i;
+  int len = 0;
+
+  s_addr = ip4_addr_get_u32(addr);
+
+  rp = buf;
+  ap = (u8_t *)&s_addr;
+  for (n = 0; n < 4; n++) {
+    i = 0;
+    do {
+      rem = *ap % (u8_t)10;
+      *ap /= (u8_t)10;
+      inv[i++] = (char)('0' + rem);
+    } while (*ap);
+    while (i--) {
+      if (len++ >= buflen) {
+        return NULL;
+      }
+      *rp++ = inv[i];
+    }
+    if (len++ >= buflen) {
+      return NULL;
+    }
+    *rp++ = '.';
+    ap++;
+  }
+  *--rp = 0;
+  return buf;
+}
+
+#endif /* LWIP_IPV4 */
@@ -0,0 +1,894 @@
+/**
+ * @file
+ * This is the IPv4 packet segmentation and reassembly implementation.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Jani Monoses <jani@iv.ro>
+ *         Simon Goldschmidt
+ * original reassembly code by Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_IPV4
+
+#include "lwip/ip4_frag.h"
+#include "lwip/def.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/netif.h"
+#include "lwip/stats.h"
+#include "lwip/icmp.h"
+
+#include <string.h>
+
+#if IP_REASSEMBLY
+/**
+ * The IP reassembly code currently has the following limitations:
+ * - IP header options are not supported
+ * - fragments must not overlap (e.g. due to different routes),
+ *   currently, overlapping or duplicate fragments are thrown away
+ *   if IP_REASS_CHECK_OVERLAP=1 (the default)!
+ *
+ * @todo: work with IP header options
+ */
+
+/** Setting this to 0, you can turn off checking the fragments for overlapping
+ * regions. The code gets a little smaller. Only use this if you know that
+ * overlapping won't occur on your network! */
+#ifndef IP_REASS_CHECK_OVERLAP
+#define IP_REASS_CHECK_OVERLAP 1
+#endif /* IP_REASS_CHECK_OVERLAP */
+
+/** Set to 0 to prevent freeing the oldest datagram when the reassembly buffer is
+ * full (IP_REASS_MAX_PBUFS pbufs are enqueued). The code gets a little smaller.
+ * Datagrams will be freed by timeout only. Especially useful when MEMP_NUM_REASSDATA
+ * is set to 1, so one datagram can be reassembled at a time, only. */
+#ifndef IP_REASS_FREE_OLDEST
+#define IP_REASS_FREE_OLDEST 1
+#endif /* IP_REASS_FREE_OLDEST */
+
+#define IP_REASS_FLAG_LASTFRAG 0x01
+
+#define IP_REASS_VALIDATE_TELEGRAM_FINISHED  1
+#define IP_REASS_VALIDATE_PBUF_QUEUED        0
+#define IP_REASS_VALIDATE_PBUF_DROPPED       -1
+
+/** This is a helper struct which holds the starting
+ * offset and the ending offset of this fragment to
+ * easily chain the fragments.
+ * It has the same packing requirements as the IP header, since it replaces
+ * the IP header in memory in incoming fragments (after copying it) to keep
+ * track of the various fragments. (-> If the IP header doesn't need packing,
+ * this struct doesn't need packing, too.)
+ */
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct ip_reass_helper {
+  PACK_STRUCT_FIELD(struct pbuf *next_pbuf);
+  PACK_STRUCT_FIELD(u16_t start);
+  PACK_STRUCT_FIELD(u16_t end);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/epstruct.h"
+#endif
+
+#define IP_ADDRESSES_AND_ID_MATCH(iphdrA, iphdrB)  \
+  (ip4_addr_cmp(&(iphdrA)->src, &(iphdrB)->src) && \
+   ip4_addr_cmp(&(iphdrA)->dest, &(iphdrB)->dest) && \
+   IPH_ID(iphdrA) == IPH_ID(iphdrB)) ? 1 : 0
+
+/* global variables */
+static struct ip_reassdata *reassdatagrams;
+static u16_t ip_reass_pbufcount;
+
+/* function prototypes */
+static void ip_reass_dequeue_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev);
+static int ip_reass_free_complete_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev);
+
+/**
+ * Reassembly timer base function
+ * for both NO_SYS == 0 and 1 (!).
+ *
+ * Should be called every 1000 msec (defined by IP_TMR_INTERVAL).
+ */
+void
+ip_reass_tmr(void)
+{
+  struct ip_reassdata *r, *prev = NULL;
+
+  r = reassdatagrams;
+  while (r != NULL) {
+    /* Decrement the timer. Once it reaches 0,
+     * clean up the incomplete fragment assembly */
+    if (r->timer > 0) {
+      r->timer--;
+      LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_reass_tmr: timer dec %"U16_F"\n", (u16_t)r->timer));
+      prev = r;
+      r = r->next;
+    } else {
+      /* reassembly timed out */
+      struct ip_reassdata *tmp;
+      LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_reass_tmr: timer timed out\n"));
+      tmp = r;
+      /* get the next pointer before freeing */
+      r = r->next;
+      /* free the helper struct and all enqueued pbufs */
+      ip_reass_free_complete_datagram(tmp, prev);
+    }
+  }
+}
+
+/**
+ * Free a datagram (struct ip_reassdata) and all its pbufs.
+ * Updates the total count of enqueued pbufs (ip_reass_pbufcount),
+ * SNMP counters and sends an ICMP time exceeded packet.
+ *
+ * @param ipr datagram to free
+ * @param prev the previous datagram in the linked list
+ * @return the number of pbufs freed
+ */
+static int
+ip_reass_free_complete_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev)
+{
+  u16_t pbufs_freed = 0;
+  u16_t clen;
+  struct pbuf *p;
+  struct ip_reass_helper *iprh;
+
+  LWIP_ASSERT("prev != ipr", prev != ipr);
+  if (prev != NULL) {
+    LWIP_ASSERT("prev->next == ipr", prev->next == ipr);
+  }
+
+  MIB2_STATS_INC(mib2.ipreasmfails);
+#if LWIP_ICMP
+  iprh = (struct ip_reass_helper *)ipr->p->payload;
+  if (iprh->start == 0) {
+    /* The first fragment was received, send ICMP time exceeded. */
+    /* First, de-queue the first pbuf from r->p. */
+    p = ipr->p;
+    ipr->p = iprh->next_pbuf;
+    /* Then, copy the original header into it. */
+    SMEMCPY(p->payload, &ipr->iphdr, IP_HLEN);
+    icmp_time_exceeded(p, ICMP_TE_FRAG);
+    clen = pbuf_clen(p);
+    LWIP_ASSERT("pbufs_freed + clen <= 0xffff", pbufs_freed + clen <= 0xffff);
+    pbufs_freed = (u16_t)(pbufs_freed + clen);
+    pbuf_free(p);
+  }
+#endif /* LWIP_ICMP */
+
+  /* First, free all received pbufs.  The individual pbufs need to be released
+     separately as they have not yet been chained */
+  p = ipr->p;
+  while (p != NULL) {
+    struct pbuf *pcur;
+    iprh = (struct ip_reass_helper *)p->payload;
+    pcur = p;
+    /* get the next pointer before freeing */
+    p = iprh->next_pbuf;
+    clen = pbuf_clen(pcur);
+    LWIP_ASSERT("pbufs_freed + clen <= 0xffff", pbufs_freed + clen <= 0xffff);
+    pbufs_freed = (u16_t)(pbufs_freed + clen);
+    pbuf_free(pcur);
+  }
+  /* Then, unchain the struct ip_reassdata from the list and free it. */
+  ip_reass_dequeue_datagram(ipr, prev);
+  LWIP_ASSERT("ip_reass_pbufcount >= pbufs_freed", ip_reass_pbufcount >= pbufs_freed);
+  ip_reass_pbufcount = (u16_t)(ip_reass_pbufcount - pbufs_freed);
+
+  return pbufs_freed;
+}
+
+#if IP_REASS_FREE_OLDEST
+/**
+ * Free the oldest datagram to make room for enqueueing new fragments.
+ * The datagram 'fraghdr' belongs to is not freed!
+ *
+ * @param fraghdr IP header of the current fragment
+ * @param pbufs_needed number of pbufs needed to enqueue
+ *        (used for freeing other datagrams if not enough space)
+ * @return the number of pbufs freed
+ */
+static int
+ip_reass_remove_oldest_datagram(struct ip_hdr *fraghdr, int pbufs_needed)
+{
+  /* @todo Can't we simply remove the last datagram in the
+   *       linked list behind reassdatagrams?
+   */
+  struct ip_reassdata *r, *oldest, *prev, *oldest_prev;
+  int pbufs_freed = 0, pbufs_freed_current;
+  int other_datagrams;
+
+  /* Free datagrams until being allowed to enqueue 'pbufs_needed' pbufs,
+   * but don't free the datagram that 'fraghdr' belongs to! */
+  do {
+    oldest = NULL;
+    prev = NULL;
+    oldest_prev = NULL;
+    other_datagrams = 0;
+    r = reassdatagrams;
+    while (r != NULL) {
+      if (!IP_ADDRESSES_AND_ID_MATCH(&r->iphdr, fraghdr)) {
+        /* Not the same datagram as fraghdr */
+        other_datagrams++;
+        if (oldest == NULL) {
+          oldest = r;
+          oldest_prev = prev;
+        } else if (r->timer <= oldest->timer) {
+          /* older than the previous oldest */
+          oldest = r;
+          oldest_prev = prev;
+        }
+      }
+      if (r->next != NULL) {
+        prev = r;
+      }
+      r = r->next;
+    }
+    if (oldest != NULL) {
+      pbufs_freed_current = ip_reass_free_complete_datagram(oldest, oldest_prev);
+      pbufs_freed += pbufs_freed_current;
+    }
+  } while ((pbufs_freed < pbufs_needed) && (other_datagrams > 1));
+  return pbufs_freed;
+}
+#endif /* IP_REASS_FREE_OLDEST */
+
+/**
+ * Enqueues a new fragment into the fragment queue
+ * @param fraghdr points to the new fragments IP hdr
+ * @param clen number of pbufs needed to enqueue (used for freeing other datagrams if not enough space)
+ * @return A pointer to the queue location into which the fragment was enqueued
+ */
+static struct ip_reassdata *
+ip_reass_enqueue_new_datagram(struct ip_hdr *fraghdr, int clen)
+{
+  struct ip_reassdata *ipr;
+#if ! IP_REASS_FREE_OLDEST
+  LWIP_UNUSED_ARG(clen);
+#endif
+
+  /* No matching previous fragment found, allocate a new reassdata struct */
+  ipr = (struct ip_reassdata *)memp_malloc(MEMP_REASSDATA);
+  if (ipr == NULL) {
+#if IP_REASS_FREE_OLDEST
+    if (ip_reass_remove_oldest_datagram(fraghdr, clen) >= clen) {
+      ipr = (struct ip_reassdata *)memp_malloc(MEMP_REASSDATA);
+    }
+    if (ipr == NULL)
+#endif /* IP_REASS_FREE_OLDEST */
+    {
+      IPFRAG_STATS_INC(ip_frag.memerr);
+      LWIP_DEBUGF(IP_REASS_DEBUG, ("Failed to alloc reassdata struct\n"));
+      return NULL;
+    }
+  }
+  memset(ipr, 0, sizeof(struct ip_reassdata));
+  ipr->timer = IP_REASS_MAXAGE;
+
+  /* enqueue the new structure to the front of the list */
+  ipr->next = reassdatagrams;
+  reassdatagrams = ipr;
+  /* copy the ip header for later tests and input */
+  /* @todo: no ip options supported? */
+  SMEMCPY(&(ipr->iphdr), fraghdr, IP_HLEN);
+  return ipr;
+}
+
+/**
+ * Dequeues a datagram from the datagram queue. Doesn't deallocate the pbufs.
+ * @param ipr points to the queue entry to dequeue
+ */
+static void
+ip_reass_dequeue_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev)
+{
+  /* dequeue the reass struct  */
+  if (reassdatagrams == ipr) {
+    /* it was the first in the list */
+    reassdatagrams = ipr->next;
+  } else {
+    /* it wasn't the first, so it must have a valid 'prev' */
+    LWIP_ASSERT("sanity check linked list", prev != NULL);
+    prev->next = ipr->next;
+  }
+
+  /* now we can free the ip_reassdata struct */
+  memp_free(MEMP_REASSDATA, ipr);
+}
+
+/**
+ * Chain a new pbuf into the pbuf list that composes the datagram.  The pbuf list
+ * will grow over time as  new pbufs are rx.
+ * Also checks that the datagram passes basic continuity checks (if the last
+ * fragment was received at least once).
+ * @param ipr points to the reassembly state
+ * @param new_p points to the pbuf for the current fragment
+ * @param is_last is 1 if this pbuf has MF==0 (ipr->flags not updated yet)
+ * @return see IP_REASS_VALIDATE_* defines
+ */
+static int
+ip_reass_chain_frag_into_datagram_and_validate(struct ip_reassdata *ipr, struct pbuf *new_p, int is_last)
+{
+  struct ip_reass_helper *iprh, *iprh_tmp, *iprh_prev = NULL;
+  struct pbuf *q;
+  u16_t offset, len;
+  u8_t hlen;
+  struct ip_hdr *fraghdr;
+  int valid = 1;
+
+  /* Extract length and fragment offset from current fragment */
+  fraghdr = (struct ip_hdr *)new_p->payload;
+  len = lwip_ntohs(IPH_LEN(fraghdr));
+  hlen = IPH_HL_BYTES(fraghdr);
+  if (hlen > len) {
+    /* invalid datagram */
+    return IP_REASS_VALIDATE_PBUF_DROPPED;
+  }
+  len = (u16_t)(len - hlen);
+  offset = IPH_OFFSET_BYTES(fraghdr);
+
+  /* overwrite the fragment's ip header from the pbuf with our helper struct,
+   * and setup the embedded helper structure. */
+  /* make sure the struct ip_reass_helper fits into the IP header */
+  LWIP_ASSERT("sizeof(struct ip_reass_helper) <= IP_HLEN",
+              sizeof(struct ip_reass_helper) <= IP_HLEN);
+  iprh = (struct ip_reass_helper *)new_p->payload;
+  iprh->next_pbuf = NULL;
+  iprh->start = offset;
+  iprh->end = (u16_t)(offset + len);
+  if (iprh->end < offset) {
+    /* u16_t overflow, cannot handle this */
+    return IP_REASS_VALIDATE_PBUF_DROPPED;
+  }
+
+  /* Iterate through until we either get to the end of the list (append),
+   * or we find one with a larger offset (insert). */
+  for (q = ipr->p; q != NULL;) {
+    iprh_tmp = (struct ip_reass_helper *)q->payload;
+    if (iprh->start < iprh_tmp->start) {
+      /* the new pbuf should be inserted before this */
+      iprh->next_pbuf = q;
+      if (iprh_prev != NULL) {
+        /* not the fragment with the lowest offset */
+#if IP_REASS_CHECK_OVERLAP
+        if ((iprh->start < iprh_prev->end) || (iprh->end > iprh_tmp->start)) {
+          /* fragment overlaps with previous or following, throw away */
+          return IP_REASS_VALIDATE_PBUF_DROPPED;
+        }
+#endif /* IP_REASS_CHECK_OVERLAP */
+        iprh_prev->next_pbuf = new_p;
+        if (iprh_prev->end != iprh->start) {
+          /* There is a fragment missing between the current
+           * and the previous fragment */
+          valid = 0;
+        }
+      } else {
+#if IP_REASS_CHECK_OVERLAP
+        if (iprh->end > iprh_tmp->start) {
+          /* fragment overlaps with following, throw away */
+          return IP_REASS_VALIDATE_PBUF_DROPPED;
+        }
+#endif /* IP_REASS_CHECK_OVERLAP */
+        /* fragment with the lowest offset */
+        ipr->p = new_p;
+      }
+      break;
+    } else if (iprh->start == iprh_tmp->start) {
+      /* received the same datagram twice: no need to keep the datagram */
+      return IP_REASS_VALIDATE_PBUF_DROPPED;
+#if IP_REASS_CHECK_OVERLAP
+    } else if (iprh->start < iprh_tmp->end) {
+      /* overlap: no need to keep the new datagram */
+      return IP_REASS_VALIDATE_PBUF_DROPPED;
+#endif /* IP_REASS_CHECK_OVERLAP */
+    } else {
+      /* Check if the fragments received so far have no holes. */
+      if (iprh_prev != NULL) {
+        if (iprh_prev->end != iprh_tmp->start) {
+          /* There is a fragment missing between the current
+           * and the previous fragment */
+          valid = 0;
+        }
+      }
+    }
+    q = iprh_tmp->next_pbuf;
+    iprh_prev = iprh_tmp;
+  }
+
+  /* If q is NULL, then we made it to the end of the list. Determine what to do now */
+  if (q == NULL) {
+    if (iprh_prev != NULL) {
+      /* this is (for now), the fragment with the highest offset:
+       * chain it to the last fragment */
+#if IP_REASS_CHECK_OVERLAP
+      LWIP_ASSERT("check fragments don't overlap", iprh_prev->end <= iprh->start);
+#endif /* IP_REASS_CHECK_OVERLAP */
+      iprh_prev->next_pbuf = new_p;
+      if (iprh_prev->end != iprh->start) {
+        valid = 0;
+      }
+    } else {
+#if IP_REASS_CHECK_OVERLAP
+      LWIP_ASSERT("no previous fragment, this must be the first fragment!",
+                  ipr->p == NULL);
+#endif /* IP_REASS_CHECK_OVERLAP */
+      /* this is the first fragment we ever received for this ip datagram */
+      ipr->p = new_p;
+    }
+  }
+
+  /* At this point, the validation part begins: */
+  /* If we already received the last fragment */
+  if (is_last || ((ipr->flags & IP_REASS_FLAG_LASTFRAG) != 0)) {
+    /* and had no holes so far */
+    if (valid) {
+      /* then check if the rest of the fragments is here */
+      /* Check if the queue starts with the first datagram */
+      if ((ipr->p == NULL) || (((struct ip_reass_helper *)ipr->p->payload)->start != 0)) {
+        valid = 0;
+      } else {
+        /* and check that there are no holes after this datagram */
+        iprh_prev = iprh;
+        q = iprh->next_pbuf;
+        while (q != NULL) {
+          iprh = (struct ip_reass_helper *)q->payload;
+          if (iprh_prev->end != iprh->start) {
+            valid = 0;
+            break;
+          }
+          iprh_prev = iprh;
+          q = iprh->next_pbuf;
+        }
+        /* if still valid, all fragments are received
+         * (because to the MF==0 already arrived */
+        if (valid) {
+          LWIP_ASSERT("sanity check", ipr->p != NULL);
+          LWIP_ASSERT("sanity check",
+                      ((struct ip_reass_helper *)ipr->p->payload) != iprh);
+          LWIP_ASSERT("validate_datagram:next_pbuf!=NULL",
+                      iprh->next_pbuf == NULL);
+        }
+      }
+    }
+    /* If valid is 0 here, there are some fragments missing in the middle
+     * (since MF == 0 has already arrived). Such datagrams simply time out if
+     * no more fragments are received... */
+    return valid ? IP_REASS_VALIDATE_TELEGRAM_FINISHED : IP_REASS_VALIDATE_PBUF_QUEUED;
+  }
+  /* If we come here, not all fragments were received, yet! */
+  return IP_REASS_VALIDATE_PBUF_QUEUED; /* not yet valid! */
+}
+
+/**
+ * Reassembles incoming IP fragments into an IP datagram.
+ *
+ * @param p points to a pbuf chain of the fragment
+ * @return NULL if reassembly is incomplete, ? otherwise
+ */
+struct pbuf *
+ip4_reass(struct pbuf *p)
+{
+  struct pbuf *r;
+  struct ip_hdr *fraghdr;
+  struct ip_reassdata *ipr;
+  struct ip_reass_helper *iprh;
+  u16_t offset, len, clen;
+  u8_t hlen;
+  int valid;
+  int is_last;
+
+  IPFRAG_STATS_INC(ip_frag.recv);
+  MIB2_STATS_INC(mib2.ipreasmreqds);
+
+  fraghdr = (struct ip_hdr *)p->payload;
+
+  if (IPH_HL_BYTES(fraghdr) != IP_HLEN) {
+    LWIP_DEBUGF(IP_REASS_DEBUG, ("ip4_reass: IP options currently not supported!\n"));
+    IPFRAG_STATS_INC(ip_frag.err);
+    goto nullreturn;
+  }
+
+  offset = IPH_OFFSET_BYTES(fraghdr);
+  len = lwip_ntohs(IPH_LEN(fraghdr));
+  hlen = IPH_HL_BYTES(fraghdr);
+  if (hlen > len) {
+    /* invalid datagram */
+    goto nullreturn;
+  }
+  len = (u16_t)(len - hlen);
+
+  /* Check if we are allowed to enqueue more datagrams. */
+  clen = pbuf_clen(p);
+  if ((ip_reass_pbufcount + clen) > IP_REASS_MAX_PBUFS) {
+#if IP_REASS_FREE_OLDEST
+    if (!ip_reass_remove_oldest_datagram(fraghdr, clen) ||
+        ((ip_reass_pbufcount + clen) > IP_REASS_MAX_PBUFS))
+#endif /* IP_REASS_FREE_OLDEST */
+    {
+      /* No datagram could be freed and still too many pbufs enqueued */
+      LWIP_DEBUGF(IP_REASS_DEBUG, ("ip4_reass: Overflow condition: pbufct=%d, clen=%d, MAX=%d\n",
+                                   ip_reass_pbufcount, clen, IP_REASS_MAX_PBUFS));
+      IPFRAG_STATS_INC(ip_frag.memerr);
+      /* @todo: send ICMP time exceeded here? */
+      /* drop this pbuf */
+      goto nullreturn;
+    }
+  }
+
+  /* Look for the datagram the fragment belongs to in the current datagram queue,
+   * remembering the previous in the queue for later dequeueing. */
+  for (ipr = reassdatagrams; ipr != NULL; ipr = ipr->next) {
+    /* Check if the incoming fragment matches the one currently present
+       in the reassembly buffer. If so, we proceed with copying the
+       fragment into the buffer. */
+    if (IP_ADDRESSES_AND_ID_MATCH(&ipr->iphdr, fraghdr)) {
+      LWIP_DEBUGF(IP_REASS_DEBUG, ("ip4_reass: matching previous fragment ID=%"X16_F"\n",
+                                   lwip_ntohs(IPH_ID(fraghdr))));
+      IPFRAG_STATS_INC(ip_frag.cachehit);
+      break;
+    }
+  }
+
+  if (ipr == NULL) {
+    /* Enqueue a new datagram into the datagram queue */
+    ipr = ip_reass_enqueue_new_datagram(fraghdr, clen);
+    /* Bail if unable to enqueue */
+    if (ipr == NULL) {
+      goto nullreturn;
+    }
+  } else {
+    if (((lwip_ntohs(IPH_OFFSET(fraghdr)) & IP_OFFMASK) == 0) &&
+        ((lwip_ntohs(IPH_OFFSET(&ipr->iphdr)) & IP_OFFMASK) != 0)) {
+      /* ipr->iphdr is not the header from the first fragment, but fraghdr is
+       * -> copy fraghdr into ipr->iphdr since we want to have the header
+       * of the first fragment (for ICMP time exceeded and later, for copying
+       * all options, if supported)*/
+      SMEMCPY(&ipr->iphdr, fraghdr, IP_HLEN);
+    }
+  }
+
+  /* At this point, we have either created a new entry or pointing
+   * to an existing one */
+
+  /* check for 'no more fragments', and update queue entry*/
+  is_last = (IPH_OFFSET(fraghdr) & PP_NTOHS(IP_MF)) == 0;
+  if (is_last) {
+    u16_t datagram_len = (u16_t)(offset + len);
+    if ((datagram_len < offset) || (datagram_len > (0xFFFF - IP_HLEN))) {
+      /* u16_t overflow, cannot handle this */
+      goto nullreturn_ipr;
+    }
+  }
+  /* find the right place to insert this pbuf */
+  /* @todo: trim pbufs if fragments are overlapping */
+  valid = ip_reass_chain_frag_into_datagram_and_validate(ipr, p, is_last);
+  if (valid == IP_REASS_VALIDATE_PBUF_DROPPED) {
+    goto nullreturn_ipr;
+  }
+  /* if we come here, the pbuf has been enqueued */
+
+  /* Track the current number of pbufs current 'in-flight', in order to limit
+     the number of fragments that may be enqueued at any one time
+     (overflow checked by testing against IP_REASS_MAX_PBUFS) */
+  ip_reass_pbufcount = (u16_t)(ip_reass_pbufcount + clen);
+  if (is_last) {
+    u16_t datagram_len = (u16_t)(offset + len);
+    ipr->datagram_len = datagram_len;
+    ipr->flags |= IP_REASS_FLAG_LASTFRAG;
+    LWIP_DEBUGF(IP_REASS_DEBUG,
+                ("ip4_reass: last fragment seen, total len %"S16_F"\n",
+                 ipr->datagram_len));
+  }
+
+  if (valid == IP_REASS_VALIDATE_TELEGRAM_FINISHED) {
+    struct ip_reassdata *ipr_prev;
+    /* the totally last fragment (flag more fragments = 0) was received at least
+     * once AND all fragments are received */
+    u16_t datagram_len = (u16_t)(ipr->datagram_len + IP_HLEN);
+
+    /* save the second pbuf before copying the header over the pointer */
+    r = ((struct ip_reass_helper *)ipr->p->payload)->next_pbuf;
+
+    /* copy the original ip header back to the first pbuf */
+    fraghdr = (struct ip_hdr *)(ipr->p->payload);
+    SMEMCPY(fraghdr, &ipr->iphdr, IP_HLEN);
+    IPH_LEN_SET(fraghdr, lwip_htons(datagram_len));
+    IPH_OFFSET_SET(fraghdr, 0);
+    IPH_CHKSUM_SET(fraghdr, 0);
+    /* @todo: do we need to set/calculate the correct checksum? */
+#if CHECKSUM_GEN_IP
+    IF__NETIF_CHECKSUM_ENABLED(ip_current_input_netif(), NETIF_CHECKSUM_GEN_IP) {
+      IPH_CHKSUM_SET(fraghdr, inet_chksum(fraghdr, IP_HLEN));
+    }
+#endif /* CHECKSUM_GEN_IP */
+
+    p = ipr->p;
+
+    /* chain together the pbufs contained within the reass_data list. */
+    while (r != NULL) {
+      iprh = (struct ip_reass_helper *)r->payload;
+
+      /* hide the ip header for every succeeding fragment */
+      pbuf_remove_header(r, IP_HLEN);
+      pbuf_cat(p, r);
+      r = iprh->next_pbuf;
+    }
+
+    /* find the previous entry in the linked list */
+    if (ipr == reassdatagrams) {
+      ipr_prev = NULL;
+    } else {
+      for (ipr_prev = reassdatagrams; ipr_prev != NULL; ipr_prev = ipr_prev->next) {
+        if (ipr_prev->next == ipr) {
+          break;
+        }
+      }
+    }
+
+    /* release the sources allocate for the fragment queue entry */
+    ip_reass_dequeue_datagram(ipr, ipr_prev);
+
+    /* and adjust the number of pbufs currently queued for reassembly. */
+    clen = pbuf_clen(p);
+    LWIP_ASSERT("ip_reass_pbufcount >= clen", ip_reass_pbufcount >= clen);
+    ip_reass_pbufcount = (u16_t)(ip_reass_pbufcount - clen);
+
+    MIB2_STATS_INC(mib2.ipreasmoks);
+
+    /* Return the pbuf chain */
+    return p;
+  }
+  /* the datagram is not (yet?) reassembled completely */
+  LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_reass_pbufcount: %d out\n", ip_reass_pbufcount));
+  return NULL;
+
+nullreturn_ipr:
+  LWIP_ASSERT("ipr != NULL", ipr != NULL);
+  if (ipr->p == NULL) {
+    /* dropped pbuf after creating a new datagram entry: remove the entry, too */
+    LWIP_ASSERT("not firstalthough just enqueued", ipr == reassdatagrams);
+    ip_reass_dequeue_datagram(ipr, NULL);
+  }
+
+nullreturn:
+  LWIP_DEBUGF(IP_REASS_DEBUG, ("ip4_reass: nullreturn\n"));
+  IPFRAG_STATS_INC(ip_frag.drop);
+  pbuf_free(p);
+  return NULL;
+}
+#endif /* IP_REASSEMBLY */
+
+#if IP_FRAG
+#if !LWIP_NETIF_TX_SINGLE_PBUF
+/** Allocate a new struct pbuf_custom_ref */
+static struct pbuf_custom_ref *
+ip_frag_alloc_pbuf_custom_ref(void)
+{
+  return (struct pbuf_custom_ref *)memp_malloc(MEMP_FRAG_PBUF);
+}
+
+/** Free a struct pbuf_custom_ref */
+static void
+ip_frag_free_pbuf_custom_ref(struct pbuf_custom_ref *p)
+{
+  LWIP_ASSERT("p != NULL", p != NULL);
+  memp_free(MEMP_FRAG_PBUF, p);
+}
+
+/** Free-callback function to free a 'struct pbuf_custom_ref', called by
+ * pbuf_free. */
+static void
+ipfrag_free_pbuf_custom(struct pbuf *p)
+{
+  struct pbuf_custom_ref *pcr = (struct pbuf_custom_ref *)p;
+  LWIP_ASSERT("pcr != NULL", pcr != NULL);
+  LWIP_ASSERT("pcr == p", (void *)pcr == (void *)p);
+  if (pcr->original != NULL) {
+    pbuf_free(pcr->original);
+  }
+  ip_frag_free_pbuf_custom_ref(pcr);
+}
+#endif /* !LWIP_NETIF_TX_SINGLE_PBUF */
+
+/**
+ * Fragment an IP datagram if too large for the netif.
+ *
+ * Chop the datagram in MTU sized chunks and send them in order
+ * by pointing PBUF_REFs into p.
+ *
+ * @param p ip packet to send
+ * @param netif the netif on which to send
+ * @param dest destination ip address to which to send
+ *
+ * @return ERR_OK if sent successfully, err_t otherwise
+ */
+err_t
+ip4_frag(struct pbuf *p, struct netif *netif, const ip4_addr_t *dest)
+{
+  struct pbuf *rambuf;
+#if !LWIP_NETIF_TX_SINGLE_PBUF
+  struct pbuf *newpbuf;
+  u16_t newpbuflen = 0;
+  u16_t left_to_copy;
+#endif
+  struct ip_hdr *original_iphdr;
+  struct ip_hdr *iphdr;
+  const u16_t nfb = (u16_t)((netif->mtu - IP_HLEN) / 8);
+  u16_t left, fragsize;
+  u16_t ofo;
+  int last;
+  u16_t poff = IP_HLEN;
+  u16_t tmp;
+  int mf_set;
+
+  original_iphdr = (struct ip_hdr *)p->payload;
+  iphdr = original_iphdr;
+  if (IPH_HL_BYTES(iphdr) != IP_HLEN) {
+    /* ip4_frag() does not support IP options */
+    return ERR_VAL;
+  }
+  LWIP_ERROR("ip4_frag(): pbuf too short", p->len >= IP_HLEN, return ERR_VAL);
+
+  /* Save original offset */
+  tmp = lwip_ntohs(IPH_OFFSET(iphdr));
+  ofo = tmp & IP_OFFMASK;
+  /* already fragmented? if so, the last fragment we create must have MF, too */
+  mf_set = tmp & IP_MF;
+
+  left = (u16_t)(p->tot_len - IP_HLEN);
+
+  while (left) {
+    /* Fill this fragment */
+    fragsize = LWIP_MIN(left, (u16_t)(nfb * 8));
+
+#if LWIP_NETIF_TX_SINGLE_PBUF
+    rambuf = pbuf_alloc(PBUF_IP, fragsize, PBUF_RAM);
+    if (rambuf == NULL) {
+      goto memerr;
+    }
+    LWIP_ASSERT("this needs a pbuf in one piece!",
+                (rambuf->len == rambuf->tot_len) && (rambuf->next == NULL));
+    poff += pbuf_copy_partial(p, rambuf->payload, fragsize, poff);
+    /* make room for the IP header */
+    if (pbuf_add_header(rambuf, IP_HLEN)) {
+      pbuf_free(rambuf);
+      goto memerr;
+    }
+    /* fill in the IP header */
+    SMEMCPY(rambuf->payload, original_iphdr, IP_HLEN);
+    iphdr = (struct ip_hdr *)rambuf->payload;
+#else /* LWIP_NETIF_TX_SINGLE_PBUF */
+    /* When not using a static buffer, create a chain of pbufs.
+     * The first will be a PBUF_RAM holding the link and IP header.
+     * The rest will be PBUF_REFs mirroring the pbuf chain to be fragged,
+     * but limited to the size of an mtu.
+     */
+    rambuf = pbuf_alloc(PBUF_LINK, IP_HLEN, PBUF_RAM);
+    if (rambuf == NULL) {
+      goto memerr;
+    }
+    LWIP_ASSERT("this needs a pbuf in one piece!",
+                (rambuf->len >= (IP_HLEN)));
+    SMEMCPY(rambuf->payload, original_iphdr, IP_HLEN);
+    iphdr = (struct ip_hdr *)rambuf->payload;
+
+    left_to_copy = fragsize;
+    while (left_to_copy) {
+      struct pbuf_custom_ref *pcr;
+      u16_t plen = (u16_t)(p->len - poff);
+      LWIP_ASSERT("p->len >= poff", p->len >= poff);
+      newpbuflen = LWIP_MIN(left_to_copy, plen);
+      /* Is this pbuf already empty? */
+      if (!newpbuflen) {
+        poff = 0;
+        p = p->next;
+        continue;
+      }
+      pcr = ip_frag_alloc_pbuf_custom_ref();
+      if (pcr == NULL) {
+        pbuf_free(rambuf);
+        goto memerr;
+      }
+      /* Mirror this pbuf, although we might not need all of it. */
+      newpbuf = pbuf_alloced_custom(PBUF_RAW, newpbuflen, PBUF_REF, &pcr->pc,
+                                    (u8_t *)p->payload + poff, newpbuflen);
+      if (newpbuf == NULL) {
+        ip_frag_free_pbuf_custom_ref(pcr);
+        pbuf_free(rambuf);
+        goto memerr;
+      }
+      pbuf_ref(p);
+      pcr->original = p;
+      pcr->pc.custom_free_function = ipfrag_free_pbuf_custom;
+
+      /* Add it to end of rambuf's chain, but using pbuf_cat, not pbuf_chain
+       * so that it is removed when pbuf_dechain is later called on rambuf.
+       */
+      pbuf_cat(rambuf, newpbuf);
+      left_to_copy = (u16_t)(left_to_copy - newpbuflen);
+      if (left_to_copy) {
+        poff = 0;
+        p = p->next;
+      }
+    }
+    poff = (u16_t)(poff + newpbuflen);
+#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
+
+    /* Correct header */
+    last = (left <= netif->mtu - IP_HLEN);
+
+    /* Set new offset and MF flag */
+    tmp = (IP_OFFMASK & (ofo));
+    if (!last || mf_set) {
+      /* the last fragment has MF set if the input frame had it */
+      tmp = tmp | IP_MF;
+    }
+    IPH_OFFSET_SET(iphdr, lwip_htons(tmp));
+    IPH_LEN_SET(iphdr, lwip_htons((u16_t)(fragsize + IP_HLEN)));
+    IPH_CHKSUM_SET(iphdr, 0);
+#if CHECKSUM_GEN_IP
+    IF__NETIF_CHECKSUM_ENABLED(netif, NETIF_CHECKSUM_GEN_IP) {
+      IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
+    }
+#endif /* CHECKSUM_GEN_IP */
+
+    /* No need for separate header pbuf - we allowed room for it in rambuf
+     * when allocated.
+     */
+    netif->output(netif, rambuf, dest);
+    IPFRAG_STATS_INC(ip_frag.xmit);
+
+    /* Unfortunately we can't reuse rambuf - the hardware may still be
+     * using the buffer. Instead we free it (and the ensuing chain) and
+     * recreate it next time round the loop. If we're lucky the hardware
+     * will have already sent the packet, the free will really free, and
+     * there will be zero memory penalty.
+     */
+
+    pbuf_free(rambuf);
+    left = (u16_t)(left - fragsize);
+    ofo = (u16_t)(ofo + nfb);
+  }
+  MIB2_STATS_INC(mib2.ipfragoks);
+  return ERR_OK;
+memerr:
+  MIB2_STATS_INC(mib2.ipfragfails);
+  return ERR_MEM;
+}
+#endif /* IP_FRAG */
+
+#endif /* LWIP_IPV4 */
@@ -0,0 +1,447 @@
+/**
+ * @file
+ * Dynamic pool memory manager
+ *
+ * lwIP has dedicated pools for many structures (netconn, protocol control blocks,
+ * packet buffers, ...). All these pools are managed here.
+ *
+ * @defgroup mempool Memory pools
+ * @ingroup infrastructure
+ * Custom memory pools
+
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/memp.h"
+#include "lwip/sys.h"
+#include "lwip/stats.h"
+
+#include <string.h>
+
+/* Make sure we include everything we need for size calculation required by memp_std.h */
+#include "lwip/pbuf.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+#include "lwip/priv/tcp_priv.h"
+#include "lwip/altcp.h"
+#include "lwip/ip4_frag.h"
+#include "lwip/netbuf.h"
+#include "lwip/api.h"
+#include "lwip/priv/tcpip_priv.h"
+#include "lwip/priv/api_msg.h"
+#include "lwip/priv/sockets_priv.h"
+#include "lwip/etharp.h"
+#include "lwip/igmp.h"
+#include "lwip/timeouts.h"
+/* needed by default MEMP_NUM_SYS_TIMEOUT */
+#include "netif/ppp/ppp_opts.h"
+#include "lwip/netdb.h"
+#include "lwip/dns.h"
+#include "lwip/priv/nd6_priv.h"
+#include "lwip/ip6_frag.h"
+#include "lwip/mld6.h"
+
+#define LWIP_MEMPOOL(name,num,size,desc) LWIP_MEMPOOL_DECLARE(name,num,size,desc)
+#include "lwip/priv/memp_std.h"
+
+const struct memp_desc *const memp_pools[MEMP_MAX] = {
+#define LWIP_MEMPOOL(name,num,size,desc) &memp_ ## name,
+#include "lwip/priv/memp_std.h"
+};
+
+#ifdef LWIP_HOOK_FILENAME
+#include LWIP_HOOK_FILENAME
+#endif
+
+#if MEMP_MEM_MALLOC && MEMP_OVERFLOW_CHECK >= 2
+#undef MEMP_OVERFLOW_CHECK
+/* MEMP_OVERFLOW_CHECK >= 2 does not work with MEMP_MEM_MALLOC, use 1 instead */
+#define MEMP_OVERFLOW_CHECK 1
+#endif
+
+#if MEMP_SANITY_CHECK && !MEMP_MEM_MALLOC
+/**
+ * Check that memp-lists don't form a circle, using "Floyd's cycle-finding algorithm".
+ */
+static int
+memp_sanity(const struct memp_desc *desc)
+{
+  struct memp *t, *h;
+
+  t = *desc->tab;
+  if (t != NULL) {
+    for (h = t->next; (t != NULL) && (h != NULL); t = t->next,
+         h = ((h->next != NULL) ? h->next->next : NULL)) {
+      if (t == h) {
+        return 0;
+      }
+    }
+  }
+
+  return 1;
+}
+#endif /* MEMP_SANITY_CHECK && !MEMP_MEM_MALLOC */
+
+#if MEMP_OVERFLOW_CHECK
+/**
+ * Check if a memp element was victim of an overflow or underflow
+ * (e.g. the restricted area after/before it has been altered)
+ *
+ * @param p the memp element to check
+ * @param desc the pool p comes from
+ */
+static void
+memp_overflow_check_element(struct memp *p, const struct memp_desc *desc)
+{
+  mem_overflow_check_raw((u8_t *)p + MEMP_SIZE, desc->size, "pool ", desc->desc);
+}
+
+/**
+ * Initialize the restricted area of on memp element.
+ */
+static void
+memp_overflow_init_element(struct memp *p, const struct memp_desc *desc)
+{
+  mem_overflow_init_raw((u8_t *)p + MEMP_SIZE, desc->size);
+}
+
+#if MEMP_OVERFLOW_CHECK >= 2
+/**
+ * Do an overflow check for all elements in every pool.
+ *
+ * @see memp_overflow_check_element for a description of the check
+ */
+static void
+memp_overflow_check_all(void)
+{
+  u16_t i, j;
+  struct memp *p;
+  SYS_ARCH_DECL_PROTECT(old_level);
+  SYS_ARCH_PROTECT(old_level);
+
+  for (i = 0; i < MEMP_MAX; ++i) {
+    p = (struct memp *)LWIP_MEM_ALIGN(memp_pools[i]->base);
+    for (j = 0; j < memp_pools[i]->num; ++j) {
+      memp_overflow_check_element(p, memp_pools[i]);
+      p = LWIP_ALIGNMENT_CAST(struct memp *, ((u8_t *)p + MEMP_SIZE + memp_pools[i]->size + MEM_SANITY_REGION_AFTER_ALIGNED));
+    }
+  }
+  SYS_ARCH_UNPROTECT(old_level);
+}
+#endif /* MEMP_OVERFLOW_CHECK >= 2 */
+#endif /* MEMP_OVERFLOW_CHECK */
+
+/**
+ * Initialize custom memory pool.
+ * Related functions: memp_malloc_pool, memp_free_pool
+ *
+ * @param desc pool to initialize
+ */
+void
+memp_init_pool(const struct memp_desc *desc)
+{
+#if MEMP_MEM_MALLOC
+  LWIP_UNUSED_ARG(desc);
+#else
+  int i;
+  struct memp *memp;
+
+  *desc->tab = NULL;
+  memp = (struct memp *)LWIP_MEM_ALIGN(desc->base);
+#if MEMP_MEM_INIT
+  /* force memset on pool memory */
+  memset(memp, 0, (size_t)desc->num * (MEMP_SIZE + desc->size
+#if MEMP_OVERFLOW_CHECK
+                                       + MEM_SANITY_REGION_AFTER_ALIGNED
+#endif
+                                      ));
+#endif
+  /* create a linked list of memp elements */
+  for (i = 0; i < desc->num; ++i) {
+    memp->next = *desc->tab;
+    *desc->tab = memp;
+#if MEMP_OVERFLOW_CHECK
+    memp_overflow_init_element(memp, desc);
+#endif /* MEMP_OVERFLOW_CHECK */
+    /* cast through void* to get rid of alignment warnings */
+    memp = (struct memp *)(void *)((u8_t *)memp + MEMP_SIZE + desc->size
+#if MEMP_OVERFLOW_CHECK
+                                   + MEM_SANITY_REGION_AFTER_ALIGNED
+#endif
+                                  );
+  }
+#if MEMP_STATS
+  desc->stats->avail = desc->num;
+#endif /* MEMP_STATS */
+#endif /* !MEMP_MEM_MALLOC */
+
+#if MEMP_STATS && (defined(LWIP_DEBUG) || LWIP_STATS_DISPLAY)
+  desc->stats->name  = desc->desc;
+#endif /* MEMP_STATS && (defined(LWIP_DEBUG) || LWIP_STATS_DISPLAY) */
+}
+
+/**
+ * Initializes lwIP built-in pools.
+ * Related functions: memp_malloc, memp_free
+ *
+ * Carves out memp_memory into linked lists for each pool-type.
+ */
+void
+memp_init(void)
+{
+  u16_t i;
+
+  /* for every pool: */
+  for (i = 0; i < LWIP_ARRAYSIZE(memp_pools); i++) {
+    memp_init_pool(memp_pools[i]);
+
+#if LWIP_STATS && MEMP_STATS
+    lwip_stats.memp[i] = memp_pools[i]->stats;
+#endif
+  }
+
+#if MEMP_OVERFLOW_CHECK >= 2
+  /* check everything a first time to see if it worked */
+  memp_overflow_check_all();
+#endif /* MEMP_OVERFLOW_CHECK >= 2 */
+}
+
+static void *
+#if !MEMP_OVERFLOW_CHECK
+do_memp_malloc_pool(const struct memp_desc *desc)
+#else
+do_memp_malloc_pool_fn(const struct memp_desc *desc, const char *file, const int line)
+#endif
+{
+  struct memp *memp;
+  SYS_ARCH_DECL_PROTECT(old_level);
+
+#if MEMP_MEM_MALLOC
+  memp = (struct memp *)mem_malloc(MEMP_SIZE + MEMP_ALIGN_SIZE(desc->size));
+  SYS_ARCH_PROTECT(old_level);
+#else /* MEMP_MEM_MALLOC */
+  SYS_ARCH_PROTECT(old_level);
+
+  memp = *desc->tab;
+#endif /* MEMP_MEM_MALLOC */
+
+  if (memp != NULL) {
+#if !MEMP_MEM_MALLOC
+#if MEMP_OVERFLOW_CHECK == 1
+    memp_overflow_check_element(memp, desc);
+#endif /* MEMP_OVERFLOW_CHECK */
+
+    *desc->tab = memp->next;
+#if MEMP_OVERFLOW_CHECK
+    memp->next = NULL;
+#endif /* MEMP_OVERFLOW_CHECK */
+#endif /* !MEMP_MEM_MALLOC */
+#if MEMP_OVERFLOW_CHECK
+    memp->file = file;
+    memp->line = line;
+#if MEMP_MEM_MALLOC
+    memp_overflow_init_element(memp, desc);
+#endif /* MEMP_MEM_MALLOC */
+#endif /* MEMP_OVERFLOW_CHECK */
+    LWIP_ASSERT("memp_malloc: memp properly aligned",
+                ((mem_ptr_t)memp % MEM_ALIGNMENT) == 0);
+#if MEMP_STATS
+    desc->stats->used++;
+    if (desc->stats->used > desc->stats->max) {
+      desc->stats->max = desc->stats->used;
+    }
+#endif
+    SYS_ARCH_UNPROTECT(old_level);
+    /* cast through u8_t* to get rid of alignment warnings */
+    return ((u8_t *)memp + MEMP_SIZE);
+  } else {
+#if MEMP_STATS
+    desc->stats->err++;
+#endif
+    SYS_ARCH_UNPROTECT(old_level);
+    LWIP_DEBUGF(MEMP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("memp_malloc: out of memory in pool %s\n", desc->desc));
+  }
+
+  return NULL;
+}
+
+/**
+ * Get an element from a custom pool.
+ *
+ * @param desc the pool to get an element from
+ *
+ * @return a pointer to the allocated memory or a NULL pointer on error
+ */
+void *
+#if !MEMP_OVERFLOW_CHECK
+memp_malloc_pool(const struct memp_desc *desc)
+#else
+memp_malloc_pool_fn(const struct memp_desc *desc, const char *file, const int line)
+#endif
+{
+  LWIP_ASSERT("invalid pool desc", desc != NULL);
+  if (desc == NULL) {
+    return NULL;
+  }
+
+#if !MEMP_OVERFLOW_CHECK
+  return do_memp_malloc_pool(desc);
+#else
+  return do_memp_malloc_pool_fn(desc, file, line);
+#endif
+}
+
+/**
+ * Get an element from a specific pool.
+ *
+ * @param type the pool to get an element from
+ *
+ * @return a pointer to the allocated memory or a NULL pointer on error
+ */
+void *
+#if !MEMP_OVERFLOW_CHECK
+memp_malloc(memp_t type)
+#else
+memp_malloc_fn(memp_t type, const char *file, const int line)
+#endif
+{
+  void *memp;
+  LWIP_ERROR("memp_malloc: type < MEMP_MAX", (type < MEMP_MAX), return NULL;);
+
+#if MEMP_OVERFLOW_CHECK >= 2
+  memp_overflow_check_all();
+#endif /* MEMP_OVERFLOW_CHECK >= 2 */
+
+#if !MEMP_OVERFLOW_CHECK
+  memp = do_memp_malloc_pool(memp_pools[type]);
+#else
+  memp = do_memp_malloc_pool_fn(memp_pools[type], file, line);
+#endif
+
+  return memp;
+}
+
+static void
+do_memp_free_pool(const struct memp_desc *desc, void *mem)
+{
+  struct memp *memp;
+  SYS_ARCH_DECL_PROTECT(old_level);
+
+  LWIP_ASSERT("memp_free: mem properly aligned",
+              ((mem_ptr_t)mem % MEM_ALIGNMENT) == 0);
+
+  /* cast through void* to get rid of alignment warnings */
+  memp = (struct memp *)(void *)((u8_t *)mem - MEMP_SIZE);
+
+  SYS_ARCH_PROTECT(old_level);
+
+#if MEMP_OVERFLOW_CHECK == 1
+  memp_overflow_check_element(memp, desc);
+#endif /* MEMP_OVERFLOW_CHECK */
+
+#if MEMP_STATS
+  desc->stats->used--;
+#endif
+
+#if MEMP_MEM_MALLOC
+  LWIP_UNUSED_ARG(desc);
+  SYS_ARCH_UNPROTECT(old_level);
+  mem_free(memp);
+#else /* MEMP_MEM_MALLOC */
+  memp->next = *desc->tab;
+  *desc->tab = memp;
+
+#if MEMP_SANITY_CHECK
+  LWIP_ASSERT("memp sanity", memp_sanity(desc));
+#endif /* MEMP_SANITY_CHECK */
+
+  SYS_ARCH_UNPROTECT(old_level);
+#endif /* !MEMP_MEM_MALLOC */
+}
+
+/**
+ * Put a custom pool element back into its pool.
+ *
+ * @param desc the pool where to put mem
+ * @param mem the memp element to free
+ */
+void
+memp_free_pool(const struct memp_desc *desc, void *mem)
+{
+  LWIP_ASSERT("invalid pool desc", desc != NULL);
+  if ((desc == NULL) || (mem == NULL)) {
+    return;
+  }
+
+  do_memp_free_pool(desc, mem);
+}
+
+/**
+ * Put an element back into its pool.
+ *
+ * @param type the pool where to put mem
+ * @param mem the memp element to free
+ */
+void
+memp_free(memp_t type, void *mem)
+{
+#ifdef LWIP_HOOK_MEMP_AVAILABLE
+  struct memp *old_first;
+#endif
+
+  LWIP_ERROR("memp_free: type < MEMP_MAX", (type < MEMP_MAX), return;);
+
+  if (mem == NULL) {
+    return;
+  }
+
+#if MEMP_OVERFLOW_CHECK >= 2
+  memp_overflow_check_all();
+#endif /* MEMP_OVERFLOW_CHECK >= 2 */
+
+#ifdef LWIP_HOOK_MEMP_AVAILABLE
+  old_first = *memp_pools[type]->tab;
+#endif
+
+  do_memp_free_pool(memp_pools[type], mem);
+
+#ifdef LWIP_HOOK_MEMP_AVAILABLE
+  if (old_first == NULL) {
+    LWIP_HOOK_MEMP_AVAILABLE(type);
+  }
+#endif
+}
@@ -0,0 +1,671 @@
+/**
+ * @file
+ * Implementation of raw protocol PCBs for low-level handling of
+ * different types of protocols besides (or overriding) those
+ * already available in lwIP.\n
+ * See also @ref raw_raw
+ *
+ * @defgroup raw_raw RAW
+ * @ingroup callbackstyle_api
+ * Implementation of raw protocol PCBs for low-level handling of
+ * different types of protocols besides (or overriding) those
+ * already available in lwIP.\n
+ * @see @ref api
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_RAW /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/def.h"
+#include "lwip/memp.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/raw.h"
+#include "lwip/priv/raw_priv.h"
+#include "lwip/stats.h"
+#include "lwip/ip6.h"
+#include "lwip/ip6_addr.h"
+#include "lwip/inet_chksum.h"
+
+#include <string.h>
+
+/** The list of RAW PCBs */
+static struct raw_pcb *raw_pcbs;
+
+static u8_t
+raw_input_local_match(struct raw_pcb *pcb, u8_t broadcast)
+{
+  LWIP_UNUSED_ARG(broadcast); /* in IPv6 only case */
+
+  /* check if PCB is bound to specific netif */
+  if ((pcb->netif_idx != NETIF_NO_INDEX) &&
+      (pcb->netif_idx != netif_get_index(ip_data.current_input_netif))) {
+    return 0;
+  }
+
+#if LWIP_IPV4 && LWIP_IPV6
+  /* Dual-stack: PCBs listening to any IP type also listen to any IP address */
+  if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) {
+#if IP_SOF_BROADCAST_RECV
+    if ((broadcast != 0) && !ip_get_option(pcb, SOF_BROADCAST)) {
+      return 0;
+    }
+#endif /* IP_SOF_BROADCAST_RECV */
+    return 1;
+  }
+#endif /* LWIP_IPV4 && LWIP_IPV6 */
+
+  /* Only need to check PCB if incoming IP version matches PCB IP version */
+  if (IP_ADDR_PCB_VERSION_MATCH_EXACT(pcb, ip_current_dest_addr())) {
+#if LWIP_IPV4
+    /* Special case: IPv4 broadcast: receive all broadcasts
+     * Note: broadcast variable can only be 1 if it is an IPv4 broadcast */
+    if (broadcast != 0) {
+#if IP_SOF_BROADCAST_RECV
+      if (ip_get_option(pcb, SOF_BROADCAST))
+#endif /* IP_SOF_BROADCAST_RECV */
+      {
+        if (ip4_addr_isany(ip_2_ip4(&pcb->local_ip))) {
+          return 1;
+        }
+      }
+    } else
+#endif /* LWIP_IPV4 */
+      /* Handle IPv4 and IPv6: catch all or exact match */
+      if (ip_addr_isany(&pcb->local_ip) ||
+          ip_addr_cmp(&pcb->local_ip, ip_current_dest_addr())) {
+        return 1;
+      }
+  }
+
+  return 0;
+}
+
+/**
+ * Determine if in incoming IP packet is covered by a RAW PCB
+ * and if so, pass it to a user-provided receive callback function.
+ *
+ * Given an incoming IP datagram (as a chain of pbufs) this function
+ * finds a corresponding RAW PCB and calls the corresponding receive
+ * callback function.
+ *
+ * @param p pbuf to be demultiplexed to a RAW PCB.
+ * @param inp network interface on which the datagram was received.
+ * @return - 1 if the packet has been eaten by a RAW PCB receive
+ *           callback function. The caller MAY NOT not reference the
+ *           packet any longer, and MAY NOT call pbuf_free().
+ * @return - 0 if packet is not eaten (pbuf is still referenced by the
+ *           caller).
+ *
+ */
+raw_input_state_t
+raw_input(struct pbuf *p, struct netif *inp)
+{
+  struct raw_pcb *pcb, *prev;
+  s16_t proto;
+  raw_input_state_t ret = RAW_INPUT_NONE;
+  u8_t broadcast = ip_addr_isbroadcast(ip_current_dest_addr(), ip_current_netif());
+
+  LWIP_UNUSED_ARG(inp);
+
+#if LWIP_IPV6
+#if LWIP_IPV4
+  if (IP_HDR_GET_VERSION(p->payload) == 6)
+#endif /* LWIP_IPV4 */
+  {
+    struct ip6_hdr *ip6hdr = (struct ip6_hdr *)p->payload;
+    proto = IP6H_NEXTH(ip6hdr);
+  }
+#if LWIP_IPV4
+  else
+#endif /* LWIP_IPV4 */
+#endif /* LWIP_IPV6 */
+#if LWIP_IPV4
+  {
+    proto = IPH_PROTO((struct ip_hdr *)p->payload);
+  }
+#endif /* LWIP_IPV4 */
+
+  prev = NULL;
+  pcb = raw_pcbs;
+  /* loop through all raw pcbs until the packet is eaten by one */
+  /* this allows multiple pcbs to match against the packet by design */
+  while (pcb != NULL) {
+    if ((pcb->protocol == proto) && raw_input_local_match(pcb, broadcast) &&
+        (((pcb->flags & RAW_FLAGS_CONNECTED) == 0) ||
+         ip_addr_cmp(&pcb->remote_ip, ip_current_src_addr()))) {
+      /* receive callback function available? */
+      if (pcb->recv != NULL) {
+        u8_t eaten;
+#ifndef LWIP_NOASSERT
+        void *old_payload = p->payload;
+#endif
+        ret = RAW_INPUT_DELIVERED;
+        /* the receive callback function did not eat the packet? */
+        eaten = pcb->recv(pcb->recv_arg, pcb, p, ip_current_src_addr());
+        if (eaten != 0) {
+          /* receive function ate the packet */
+          p = NULL;
+          if (prev != NULL) {
+            /* move the pcb to the front of raw_pcbs so that is
+               found faster next time */
+            prev->next = pcb->next;
+            pcb->next = raw_pcbs;
+            raw_pcbs = pcb;
+          }
+          return RAW_INPUT_EATEN;
+        } else {
+          /* sanity-check that the receive callback did not alter the pbuf */
+          LWIP_ASSERT("raw pcb recv callback altered pbuf payload pointer without eating packet",
+                      p->payload == old_payload);
+        }
+      }
+      /* no receive callback function was set for this raw PCB */
+    }
+    /* drop the packet */
+    prev = pcb;
+    pcb = pcb->next;
+  }
+  return ret;
+}
+
+/**
+ * @ingroup raw_raw
+ * Bind a RAW PCB.
+ *
+ * @param pcb RAW PCB to be bound with a local address ipaddr.
+ * @param ipaddr local IP address to bind with. Use IP4_ADDR_ANY to
+ * bind to all local interfaces.
+ *
+ * @return lwIP error code.
+ * - ERR_OK. Successful. No error occurred.
+ * - ERR_USE. The specified IP address is already bound to by
+ * another RAW PCB.
+ *
+ * @see raw_disconnect()
+ */
+err_t
+raw_bind(struct raw_pcb *pcb, const ip_addr_t *ipaddr)
+{
+  LWIP_ASSERT_CORE_LOCKED();
+  if ((pcb == NULL) || (ipaddr == NULL)) {
+    return ERR_VAL;
+  }
+  ip_addr_set_ipaddr(&pcb->local_ip, ipaddr);
+#if LWIP_IPV6 && LWIP_IPV6_SCOPES
+  /* If the given IP address should have a zone but doesn't, assign one now.
+   * This is legacy support: scope-aware callers should always provide properly
+   * zoned source addresses. */
+  if (IP_IS_V6(&pcb->local_ip) &&
+      ip6_addr_lacks_zone(ip_2_ip6(&pcb->local_ip), IP6_UNKNOWN)) {
+    ip6_addr_select_zone(ip_2_ip6(&pcb->local_ip), ip_2_ip6(&pcb->local_ip));
+  }
+#endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */
+  return ERR_OK;
+}
+
+/**
+ * @ingroup raw_raw
+ * Bind an RAW PCB to a specific netif.
+ * After calling this function, all packets received via this PCB
+ * are guaranteed to have come in via the specified netif, and all
+ * outgoing packets will go out via the specified netif.
+ *
+ * @param pcb RAW PCB to be bound with netif.
+ * @param netif netif to bind to. Can be NULL.
+ *
+ * @see raw_disconnect()
+ */
+void
+raw_bind_netif(struct raw_pcb *pcb, const struct netif *netif)
+{
+  LWIP_ASSERT_CORE_LOCKED();
+  if (netif != NULL) {
+    pcb->netif_idx = netif_get_index(netif);
+  } else {
+    pcb->netif_idx = NETIF_NO_INDEX;
+  }
+}
+
+/**
+ * @ingroup raw_raw
+ * Connect an RAW PCB. This function is required by upper layers
+ * of lwip. Using the raw api you could use raw_sendto() instead
+ *
+ * This will associate the RAW PCB with the remote address.
+ *
+ * @param pcb RAW PCB to be connected with remote address ipaddr and port.
+ * @param ipaddr remote IP address to connect with.
+ *
+ * @return lwIP error code
+ *
+ * @see raw_disconnect() and raw_sendto()
+ */
+err_t
+raw_connect(struct raw_pcb *pcb, const ip_addr_t *ipaddr)
+{
+  LWIP_ASSERT_CORE_LOCKED();
+  if ((pcb == NULL) || (ipaddr == NULL)) {
+    return ERR_VAL;
+  }
+  ip_addr_set_ipaddr(&pcb->remote_ip, ipaddr);
+#if LWIP_IPV6 && LWIP_IPV6_SCOPES
+  /* If the given IP address should have a zone but doesn't, assign one now,
+   * using the bound address to make a more informed decision when possible. */
+  if (IP_IS_V6(&pcb->remote_ip) &&
+      ip6_addr_lacks_zone(ip_2_ip6(&pcb->remote_ip), IP6_UNKNOWN)) {
+    ip6_addr_select_zone(ip_2_ip6(&pcb->remote_ip), ip_2_ip6(&pcb->local_ip));
+  }
+#endif /* LWIP_IPV6 && LWIP_IPV6_SCOPES */
+  raw_set_flags(pcb, RAW_FLAGS_CONNECTED);
+  return ERR_OK;
+}
+
+/**
+ * @ingroup raw_raw
+ * Disconnect a RAW PCB.
+ *
+ * @param pcb the raw pcb to disconnect.
+ */
+void
+raw_disconnect(struct raw_pcb *pcb)
+{
+  LWIP_ASSERT_CORE_LOCKED();
+  /* reset remote address association */
+#if LWIP_IPV4 && LWIP_IPV6
+  if (IP_IS_ANY_TYPE_VAL(pcb->local_ip)) {
+    ip_addr_copy(pcb->remote_ip, *IP_ANY_TYPE);
+  } else {
+#endif
+    ip_addr_set_any(IP_IS_V6_VAL(pcb->remote_ip), &pcb->remote_ip);
+#if LWIP_IPV4 && LWIP_IPV6
+  }
+#endif
+  pcb->netif_idx = NETIF_NO_INDEX;
+  /* mark PCB as unconnected */
+  raw_clear_flags(pcb, RAW_FLAGS_CONNECTED);
+}
+
+/**
+ * @ingroup raw_raw
+ * Set the callback function for received packets that match the
+ * raw PCB's protocol and binding.
+ *
+ * The callback function MUST either
+ * - eat the packet by calling pbuf_free() and returning non-zero. The
+ *   packet will not be passed to other raw PCBs or other protocol layers.
+ * - not free the packet, and return zero. The packet will be matched
+ *   against further PCBs and/or forwarded to another protocol layers.
+ */
+void
+raw_recv(struct raw_pcb *pcb, raw_recv_fn recv, void *recv_arg)
+{
+  LWIP_ASSERT_CORE_LOCKED();
+  /* remember recv() callback and user data */
+  pcb->recv = recv;
+  pcb->recv_arg = recv_arg;
+}
+
+/**
+ * @ingroup raw_raw
+ * Send the raw IP packet to the given address. An IP header will be prepended
+ * to the packet, unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that
+ * case, the packet must include an IP header, which will then be sent as is.
+ *
+ * @param pcb the raw pcb which to send
+ * @param p the IP payload to send
+ * @param ipaddr the destination address of the IP packet
+ *
+ */
+err_t
+raw_sendto(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *ipaddr)
+{
+  struct netif *netif;
+  const ip_addr_t *src_ip;
+
+  if ((pcb == NULL) || (ipaddr == NULL) || !IP_ADDR_PCB_VERSION_MATCH(pcb, ipaddr)) {
+    return ERR_VAL;
+  }
+
+  LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_sendto\n"));
+
+  if (pcb->netif_idx != NETIF_NO_INDEX) {
+    netif = netif_get_by_index(pcb->netif_idx);
+  } else {
+#if LWIP_MULTICAST_TX_OPTIONS
+    netif = NULL;
+    if (ip_addr_ismulticast(ipaddr)) {
+      /* For multicast-destined packets, use the user-provided interface index to
+       * determine the outgoing interface, if an interface index is set and a
+       * matching netif can be found. Otherwise, fall back to regular routing. */
+      netif = netif_get_by_index(pcb->mcast_ifindex);
+    }
+
+    if (netif == NULL)
+#endif /* LWIP_MULTICAST_TX_OPTIONS */
+    {
+      netif = ip_route(&pcb->local_ip, ipaddr);
+    }
+  }
+
+  if (netif == NULL) {
+    LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: No route to "));
+    ip_addr_debug_print(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ipaddr);
+    return ERR_RTE;
+  }
+
+  if (ip_addr_isany(&pcb->local_ip) || ip_addr_ismulticast(&pcb->local_ip)) {
+    /* use outgoing network interface IP address as source address */
+    src_ip = ip_netif_get_local_ip(netif, ipaddr);
+#if LWIP_IPV6
+    if (src_ip == NULL) {
+      return ERR_RTE;
+    }
+#endif /* LWIP_IPV6 */
+  } else {
+    /* use RAW PCB local IP address as source address */
+    src_ip = &pcb->local_ip;
+  }
+
+  return raw_sendto_if_src(pcb, p, ipaddr, netif, src_ip);
+}
+
+/**
+ * @ingroup raw_raw
+ * Send the raw IP packet to the given address, using a particular outgoing
+ * netif and source IP address. An IP header will be prepended to the packet,
+ * unless the RAW_FLAGS_HDRINCL flag is set on the PCB. In that case, the
+ * packet must include an IP header, which will then be sent as is.
+ *
+ * @param pcb RAW PCB used to send the data
+ * @param p chain of pbufs to be sent
+ * @param dst_ip destination IP address
+ * @param netif the netif used for sending
+ * @param src_ip source IP address
+ */
+err_t
+raw_sendto_if_src(struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_ip,
+                  struct netif *netif, const ip_addr_t *src_ip)
+{
+  err_t err;
+  struct pbuf *q; /* q will be sent down the stack */
+  u16_t header_size;
+  u8_t ttl;
+
+  LWIP_ASSERT_CORE_LOCKED();
+
+  if ((pcb == NULL) || (dst_ip == NULL) || (netif == NULL) || (src_ip == NULL) ||
+      !IP_ADDR_PCB_VERSION_MATCH(pcb, src_ip) || !IP_ADDR_PCB_VERSION_MATCH(pcb, dst_ip)) {
+    return ERR_VAL;
+  }
+
+  header_size = (
+#if LWIP_IPV4 && LWIP_IPV6
+                  IP_IS_V6(dst_ip) ? IP6_HLEN : IP_HLEN);
+#elif LWIP_IPV4
+                  IP_HLEN);
+#else
+                  IP6_HLEN);
+#endif
+
+  /* Handle the HDRINCL option as an exception: none of the code below applies
+   * to this case, and sending the packet needs to be done differently too. */
+  if (pcb->flags & RAW_FLAGS_HDRINCL) {
+    /* A full header *must* be present in the first pbuf of the chain, as the
+     * output routines may access its fields directly. */
+    if (p->len < header_size) {
+      return ERR_VAL;
+    }
+    /* @todo multicast loop support, if at all desired for this scenario.. */
+    NETIF_SET_HINTS(netif, &pcb->netif_hints);
+    err = ip_output_if_hdrincl(p, src_ip, dst_ip, netif);
+    NETIF_RESET_HINTS(netif);
+    return err;
+  }
+
+  /* packet too large to add an IP header without causing an overflow? */
+  if ((u16_t)(p->tot_len + header_size) < p->tot_len) {
+    return ERR_MEM;
+  }
+  /* not enough space to add an IP header to first pbuf in given p chain? */
+  if (pbuf_add_header(p, header_size)) {
+    /* allocate header in new pbuf */
+    q = pbuf_alloc(PBUF_IP, 0, PBUF_RAM);
+    /* new header pbuf could not be allocated? */
+    if (q == NULL) {
+      LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_SERIOUS, ("raw_sendto: could not allocate header\n"));
+      return ERR_MEM;
+    }
+    if (p->tot_len != 0) {
+      /* chain header q in front of given pbuf p */
+      pbuf_chain(q, p);
+    }
+    /* { first pbuf q points to header pbuf } */
+    LWIP_DEBUGF(RAW_DEBUG, ("raw_sendto: added header pbuf %p before given pbuf %p\n", (void *)q, (void *)p));
+  } else {
+    /* first pbuf q equals given pbuf */
+    q = p;
+    if (pbuf_remove_header(q, header_size)) {
+      LWIP_ASSERT("Can't restore header we just removed!", 0);
+      return ERR_MEM;
+    }
+  }
+
+#if IP_SOF_BROADCAST
+  if (IP_IS_V4(dst_ip)) {
+    /* broadcast filter? */
+    if (!ip_get_option(pcb, SOF_BROADCAST) && ip_addr_isbroadcast(dst_ip, netif)) {
+      LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_LEVEL_WARNING, ("raw_sendto: SOF_BROADCAST not enabled on pcb %p\n", (void *)pcb));
+      /* free any temporary header pbuf allocated by pbuf_header() */
+      if (q != p) {
+        pbuf_free(q);
+      }
+      return ERR_VAL;
+    }
+  }
+#endif /* IP_SOF_BROADCAST */
+
+  /* Multicast Loop? */
+#if LWIP_MULTICAST_TX_OPTIONS
+  if (((pcb->flags & RAW_FLAGS_MULTICAST_LOOP) != 0) && ip_addr_ismulticast(dst_ip)) {
+    q->flags |= PBUF_FLAG_MCASTLOOP;
+  }
+#endif /* LWIP_MULTICAST_TX_OPTIONS */
+
+#if LWIP_IPV6
+  /* If requested, based on the IPV6_CHECKSUM socket option per RFC3542,
+     compute the checksum and update the checksum in the payload. */
+  if (IP_IS_V6(dst_ip) && pcb->chksum_reqd) {
+    u16_t chksum = ip6_chksum_pseudo(p, pcb->protocol, p->tot_len, ip_2_ip6(src_ip), ip_2_ip6(dst_ip));
+    LWIP_ASSERT("Checksum must fit into first pbuf", p->len >= (pcb->chksum_offset + 2));
+    SMEMCPY(((u8_t *)p->payload) + pcb->chksum_offset, &chksum, sizeof(u16_t));
+  }
+#endif
+
+  /* Determine TTL to use */
+#if LWIP_MULTICAST_TX_OPTIONS
+  ttl = (ip_addr_ismulticast(dst_ip) ? raw_get_multicast_ttl(pcb) : pcb->ttl);
+#else /* LWIP_MULTICAST_TX_OPTIONS */
+  ttl = pcb->ttl;
+#endif /* LWIP_MULTICAST_TX_OPTIONS */
+
+  NETIF_SET_HINTS(netif, &pcb->netif_hints);
+  err = ip_output_if(q, src_ip, dst_ip, ttl, pcb->tos, pcb->protocol, netif);
+  NETIF_RESET_HINTS(netif);
+
+  /* did we chain a header earlier? */
+  if (q != p) {
+    /* free the header */
+    pbuf_free(q);
+  }
+  return err;
+}
+
+/**
+ * @ingroup raw_raw
+ * Send the raw IP packet to the address given by raw_connect()
+ *
+ * @param pcb the raw pcb which to send
+ * @param p the IP payload to send
+ *
+ */
+err_t
+raw_send(struct raw_pcb *pcb, struct pbuf *p)
+{
+  return raw_sendto(pcb, p, &pcb->remote_ip);
+}
+
+/**
+ * @ingroup raw_raw
+ * Remove an RAW PCB.
+ *
+ * @param pcb RAW PCB to be removed. The PCB is removed from the list of
+ * RAW PCB's and the data structure is freed from memory.
+ *
+ * @see raw_new()
+ */
+void
+raw_remove(struct raw_pcb *pcb)
+{
+  struct raw_pcb *pcb2;
+  LWIP_ASSERT_CORE_LOCKED();
+  /* pcb to be removed is first in list? */
+  if (raw_pcbs == pcb) {
+    /* make list start at 2nd pcb */
+    raw_pcbs = raw_pcbs->next;
+    /* pcb not 1st in list */
+  } else {
+    for (pcb2 = raw_pcbs; pcb2 != NULL; pcb2 = pcb2->next) {
+      /* find pcb in raw_pcbs list */
+      if (pcb2->next != NULL && pcb2->next == pcb) {
+        /* remove pcb from list */
+        pcb2->next = pcb->next;
+        break;
+      }
+    }
+  }
+  memp_free(MEMP_RAW_PCB, pcb);
+}
+
+/**
+ * @ingroup raw_raw
+ * Create a RAW PCB.
+ *
+ * @return The RAW PCB which was created. NULL if the PCB data structure
+ * could not be allocated.
+ *
+ * @param proto the protocol number of the IPs payload (e.g. IP_PROTO_ICMP)
+ *
+ * @see raw_remove()
+ */
+struct raw_pcb *
+raw_new(u8_t proto)
+{
+  struct raw_pcb *pcb;
+
+  LWIP_DEBUGF(RAW_DEBUG | LWIP_DBG_TRACE, ("raw_new\n"));
+  LWIP_ASSERT_CORE_LOCKED();
+
+  pcb = (struct raw_pcb *)memp_malloc(MEMP_RAW_PCB);
+  /* could allocate RAW PCB? */
+  if (pcb != NULL) {
+    /* initialize PCB to all zeroes */
+    memset(pcb, 0, sizeof(struct raw_pcb));
+    pcb->protocol = proto;
+    pcb->ttl = RAW_TTL;
+#if LWIP_MULTICAST_TX_OPTIONS
+    raw_set_multicast_ttl(pcb, RAW_TTL);
+#endif /* LWIP_MULTICAST_TX_OPTIONS */
+    pcb->next = raw_pcbs;
+    raw_pcbs = pcb;
+  }
+  return pcb;
+}
+
+/**
+ * @ingroup raw_raw
+ * Create a RAW PCB for specific IP type.
+ *
+ * @return The RAW PCB which was created. NULL if the PCB data structure
+ * could not be allocated.
+ *
+ * @param type IP address type, see @ref lwip_ip_addr_type definitions.
+ * If you want to listen to IPv4 and IPv6 (dual-stack) packets,
+ * supply @ref IPADDR_TYPE_ANY as argument and bind to @ref IP_ANY_TYPE.
+ * @param proto the protocol number (next header) of the IPv6 packet payload
+ *              (e.g. IP6_NEXTH_ICMP6)
+ *
+ * @see raw_remove()
+ */
+struct raw_pcb *
+raw_new_ip_type(u8_t type, u8_t proto)
+{
+  struct raw_pcb *pcb;
+  LWIP_ASSERT_CORE_LOCKED();
+  pcb = raw_new(proto);
+#if LWIP_IPV4 && LWIP_IPV6
+  if (pcb != NULL) {
+    IP_SET_TYPE_VAL(pcb->local_ip,  type);
+    IP_SET_TYPE_VAL(pcb->remote_ip, type);
+  }
+#else /* LWIP_IPV4 && LWIP_IPV6 */
+  LWIP_UNUSED_ARG(type);
+#endif /* LWIP_IPV4 && LWIP_IPV6 */
+  return pcb;
+}
+
+/** This function is called from netif.c when address is changed
+ *
+ * @param old_addr IP address of the netif before change
+ * @param new_addr IP address of the netif after change
+ */
+void raw_netif_ip_addr_changed(const ip_addr_t *old_addr, const ip_addr_t *new_addr)
+{
+  struct raw_pcb *rpcb;
+
+  if (!ip_addr_isany(old_addr) && !ip_addr_isany(new_addr)) {
+    for (rpcb = raw_pcbs; rpcb != NULL; rpcb = rpcb->next) {
+      /* PCB bound to current local interface address? */
+      if (ip_addr_cmp(&rpcb->local_ip, old_addr)) {
+        /* The PCB is bound to the old ipaddr and
+         * is set to bound to the new one instead */
+        ip_addr_copy(rpcb->local_ip, *new_addr);
+      }
+    }
+  }
+}
+
+#endif /* LWIP_RAW */
@@ -0,0 +1,169 @@
+/**
+ * @file
+ * Statistics module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_STATS /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/def.h"
+#include "lwip/stats.h"
+#include "lwip/mem.h"
+#include "lwip/debug.h"
+
+#include <string.h>
+
+struct stats_ lwip_stats;
+
+void
+stats_init(void)
+{
+#ifdef LWIP_DEBUG
+#if MEM_STATS
+  lwip_stats.mem.name = "MEM";
+#endif /* MEM_STATS */
+#endif /* LWIP_DEBUG */
+}
+
+#if LWIP_STATS_DISPLAY
+void
+stats_display_proto(struct stats_proto *proto, const char *name)
+{
+  LWIP_PLATFORM_DIAG(("\n%s\n\t", name));
+  LWIP_PLATFORM_DIAG(("xmit: %"STAT_COUNTER_F"\n\t", proto->xmit));
+  LWIP_PLATFORM_DIAG(("recv: %"STAT_COUNTER_F"\n\t", proto->recv));
+  LWIP_PLATFORM_DIAG(("fw: %"STAT_COUNTER_F"\n\t", proto->fw));
+  LWIP_PLATFORM_DIAG(("drop: %"STAT_COUNTER_F"\n\t", proto->drop));
+  LWIP_PLATFORM_DIAG(("chkerr: %"STAT_COUNTER_F"\n\t", proto->chkerr));
+  LWIP_PLATFORM_DIAG(("lenerr: %"STAT_COUNTER_F"\n\t", proto->lenerr));
+  LWIP_PLATFORM_DIAG(("memerr: %"STAT_COUNTER_F"\n\t", proto->memerr));
+  LWIP_PLATFORM_DIAG(("rterr: %"STAT_COUNTER_F"\n\t", proto->rterr));
+  LWIP_PLATFORM_DIAG(("proterr: %"STAT_COUNTER_F"\n\t", proto->proterr));
+  LWIP_PLATFORM_DIAG(("opterr: %"STAT_COUNTER_F"\n\t", proto->opterr));
+  LWIP_PLATFORM_DIAG(("err: %"STAT_COUNTER_F"\n\t", proto->err));
+  LWIP_PLATFORM_DIAG(("cachehit: %"STAT_COUNTER_F"\n", proto->cachehit));
+}
+
+#if IGMP_STATS || MLD6_STATS
+void
+stats_display_igmp(struct stats_igmp *igmp, const char *name)
+{
+  LWIP_PLATFORM_DIAG(("\n%s\n\t", name));
+  LWIP_PLATFORM_DIAG(("xmit: %"STAT_COUNTER_F"\n\t", igmp->xmit));
+  LWIP_PLATFORM_DIAG(("recv: %"STAT_COUNTER_F"\n\t", igmp->recv));
+  LWIP_PLATFORM_DIAG(("drop: %"STAT_COUNTER_F"\n\t", igmp->drop));
+  LWIP_PLATFORM_DIAG(("chkerr: %"STAT_COUNTER_F"\n\t", igmp->chkerr));
+  LWIP_PLATFORM_DIAG(("lenerr: %"STAT_COUNTER_F"\n\t", igmp->lenerr));
+  LWIP_PLATFORM_DIAG(("memerr: %"STAT_COUNTER_F"\n\t", igmp->memerr));
+  LWIP_PLATFORM_DIAG(("proterr: %"STAT_COUNTER_F"\n\t", igmp->proterr));
+  LWIP_PLATFORM_DIAG(("rx_v1: %"STAT_COUNTER_F"\n\t", igmp->rx_v1));
+  LWIP_PLATFORM_DIAG(("rx_group: %"STAT_COUNTER_F"\n\t", igmp->rx_group));
+  LWIP_PLATFORM_DIAG(("rx_general: %"STAT_COUNTER_F"\n\t", igmp->rx_general));
+  LWIP_PLATFORM_DIAG(("rx_report: %"STAT_COUNTER_F"\n\t", igmp->rx_report));
+  LWIP_PLATFORM_DIAG(("tx_join: %"STAT_COUNTER_F"\n\t", igmp->tx_join));
+  LWIP_PLATFORM_DIAG(("tx_leave: %"STAT_COUNTER_F"\n\t", igmp->tx_leave));
+  LWIP_PLATFORM_DIAG(("tx_report: %"STAT_COUNTER_F"\n", igmp->tx_report));
+}
+#endif /* IGMP_STATS || MLD6_STATS */
+
+#if MEM_STATS || MEMP_STATS
+void
+stats_display_mem(struct stats_mem *mem, const char *name)
+{
+  LWIP_PLATFORM_DIAG(("\nMEM %s\n\t", name));
+  LWIP_PLATFORM_DIAG(("avail: %"MEM_SIZE_F"\n\t", mem->avail));
+  LWIP_PLATFORM_DIAG(("used: %"MEM_SIZE_F"\n\t", mem->used));
+  LWIP_PLATFORM_DIAG(("max: %"MEM_SIZE_F"\n\t", mem->max));
+  LWIP_PLATFORM_DIAG(("err: %"STAT_COUNTER_F"\n", mem->err));
+}
+
+#if MEMP_STATS
+void
+stats_display_memp(struct stats_mem *mem, int idx)
+{
+  if (idx < MEMP_MAX) {
+    stats_display_mem(mem, mem->name);
+  }
+}
+#endif /* MEMP_STATS */
+#endif /* MEM_STATS || MEMP_STATS */
+
+#if SYS_STATS
+void
+stats_display_sys(struct stats_sys *sys)
+{
+  LWIP_PLATFORM_DIAG(("\nSYS\n\t"));
+  LWIP_PLATFORM_DIAG(("sem.used:  %"STAT_COUNTER_F"\n\t", sys->sem.used));
+  LWIP_PLATFORM_DIAG(("sem.max:   %"STAT_COUNTER_F"\n\t", sys->sem.max));
+  LWIP_PLATFORM_DIAG(("sem.err:   %"STAT_COUNTER_F"\n\t", sys->sem.err));
+  LWIP_PLATFORM_DIAG(("mutex.used: %"STAT_COUNTER_F"\n\t", sys->mutex.used));
+  LWIP_PLATFORM_DIAG(("mutex.max:  %"STAT_COUNTER_F"\n\t", sys->mutex.max));
+  LWIP_PLATFORM_DIAG(("mutex.err:  %"STAT_COUNTER_F"\n\t", sys->mutex.err));
+  LWIP_PLATFORM_DIAG(("mbox.used:  %"STAT_COUNTER_F"\n\t", sys->mbox.used));
+  LWIP_PLATFORM_DIAG(("mbox.max:   %"STAT_COUNTER_F"\n\t", sys->mbox.max));
+  LWIP_PLATFORM_DIAG(("mbox.err:   %"STAT_COUNTER_F"\n", sys->mbox.err));
+}
+#endif /* SYS_STATS */
+
+void
+stats_display(void)
+{
+  s16_t i;
+
+  LINK_STATS_DISPLAY();
+  ETHARP_STATS_DISPLAY();
+  IPFRAG_STATS_DISPLAY();
+  IP6_FRAG_STATS_DISPLAY();
+  IP_STATS_DISPLAY();
+  ND6_STATS_DISPLAY();
+  IP6_STATS_DISPLAY();
+  IGMP_STATS_DISPLAY();
+  MLD6_STATS_DISPLAY();
+  ICMP_STATS_DISPLAY();
+  ICMP6_STATS_DISPLAY();
+  UDP_STATS_DISPLAY();
+  TCP_STATS_DISPLAY();
+  MEM_STATS_DISPLAY();
+  for (i = 0; i < MEMP_MAX; i++) {
+    MEMP_STATS_DISPLAY(i);
+  }
+  SYS_STATS_DISPLAY();
+}
+#endif /* LWIP_STATS_DISPLAY */
+
+#endif /* LWIP_STATS */
+
@@ -0,0 +1,148 @@
+/**
+ * @file
+ * lwIP Operating System abstraction
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+/**
+ * @defgroup sys_layer Porting (system abstraction layer)
+ * @ingroup lwip
+ *
+ * @defgroup sys_os OS abstraction layer
+ * @ingroup sys_layer
+ * No need to implement functions in this section in NO_SYS mode.
+ * The OS-specific code should be implemented in arch/sys_arch.h
+ * and sys_arch.c of your port.
+ * 
+ * The operating system emulation layer provides a common interface
+ * between the lwIP code and the underlying operating system kernel. The
+ * general idea is that porting lwIP to new architectures requires only
+ * small changes to a few header files and a new sys_arch
+ * implementation. It is also possible to do a sys_arch implementation
+ * that does not rely on any underlying operating system.
+ * 
+ * The sys_arch provides semaphores, mailboxes and mutexes to lwIP. For the full
+ * lwIP functionality, multiple threads support can be implemented in the
+ * sys_arch, but this is not required for the basic lwIP
+ * functionality. Timer scheduling is implemented in lwIP, but can be implemented
+ * by the sys_arch port (LWIP_TIMERS_CUSTOM==1).
+ * 
+ * In addition to the source file providing the functionality of sys_arch,
+ * the OS emulation layer must provide several header files defining
+ * macros used throughout lwip.  The files required and the macros they
+ * must define are listed below the sys_arch description.
+ * 
+ * Since lwIP 1.4.0, semaphore, mutexes and mailbox functions are prototyped in a way that
+ * allows both using pointers or actual OS structures to be used. This way, memory
+ * required for such types can be either allocated in place (globally or on the
+ * stack) or on the heap (allocated internally in the "*_new()" functions).
+ * 
+ * Note:
+ * -----
+ * Be careful with using mem_malloc() in sys_arch. When malloc() refers to
+ * mem_malloc() you can run into a circular function call problem. In mem.c
+ * mem_init() tries to allocate a semaphore using mem_malloc, which of course
+ * can't be performed when sys_arch uses mem_malloc.
+ *
+ * @defgroup sys_sem Semaphores
+ * @ingroup sys_os
+ * Semaphores can be either counting or binary - lwIP works with both
+ * kinds.
+ * Semaphores are represented by the type "sys_sem_t" which is typedef'd
+ * in the sys_arch.h file. Mailboxes are equivalently represented by the
+ * type "sys_mbox_t". Mutexes are represented by the type "sys_mutex_t".
+ * lwIP does not place any restrictions on how these types are represented
+ * internally.
+ *
+ * @defgroup sys_mutex Mutexes
+ * @ingroup sys_os
+ * Mutexes are recommended to correctly handle priority inversion,
+ * especially if you use LWIP_CORE_LOCKING .
+ *
+ * @defgroup sys_mbox Mailboxes
+ * @ingroup sys_os
+ * Mailboxes should be implemented as a queue which allows multiple messages
+ * to be posted (implementing as a rendez-vous point where only one message can be
+ * posted at a time can have a highly negative impact on performance). A message
+ * in a mailbox is just a pointer, nothing more. 
+ *
+ * @defgroup sys_time Time
+ * @ingroup sys_layer
+ *
+ * @defgroup sys_prot Critical sections
+ * @ingroup sys_layer
+ * Used to protect short regions of code against concurrent access.
+ * - Your system is a bare-metal system (probably with an RTOS)
+ *   and interrupts are under your control:
+ *   Implement this as LockInterrupts() / UnlockInterrupts()
+ * - Your system uses an RTOS with deferred interrupt handling from a
+ *   worker thread: Implement as a global mutex or lock/unlock scheduler
+ * - Your system uses a high-level OS with e.g. POSIX signals:
+ *   Implement as a global mutex
+ *
+ * @defgroup sys_misc Misc
+ * @ingroup sys_os
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/sys.h"
+
+/* Most of the functions defined in sys.h must be implemented in the
+ * architecture-dependent file sys_arch.c */
+
+#if !NO_SYS
+
+#ifndef sys_msleep
+/**
+ * Sleep for some ms. Timeouts are NOT processed while sleeping.
+ *
+ * @param ms number of milliseconds to sleep
+ */
+void
+sys_msleep(u32_t ms)
+{
+  if (ms > 0) {
+    sys_sem_t delaysem;
+    err_t err = sys_sem_new(&delaysem, 0);
+    if (err == ERR_OK) {
+      sys_arch_sem_wait(&delaysem, ms);
+      sys_sem_free(&delaysem);
+    }
+  }
+}
+#endif /* sys_msleep */
+
+#endif /* !NO_SYS */
@@ -0,0 +1,451 @@
+/**
+ * @file
+ * Stack-internal timers implementation.
+ * This file includes timer callbacks for stack-internal timers as well as
+ * functions to set up or stop timers and check for expired timers.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *         Simon Goldschmidt
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/timeouts.h"
+#include "lwip/priv/tcp_priv.h"
+
+#include "lwip/def.h"
+#include "lwip/memp.h"
+#include "lwip/priv/tcpip_priv.h"
+
+#include "lwip/ip4_frag.h"
+#include "lwip/etharp.h"
+#include "lwip/dhcp.h"
+#include "lwip/autoip.h"
+#include "lwip/igmp.h"
+#include "lwip/dns.h"
+#include "lwip/nd6.h"
+#include "lwip/ip6_frag.h"
+#include "lwip/mld6.h"
+#include "lwip/dhcp6.h"
+#include "lwip/sys.h"
+#include "lwip/pbuf.h"
+
+#if LWIP_DEBUG_TIMERNAMES
+#define HANDLER(x) x, #x
+#else /* LWIP_DEBUG_TIMERNAMES */
+#define HANDLER(x) x
+#endif /* LWIP_DEBUG_TIMERNAMES */
+
+#define LWIP_MAX_TIMEOUT  0x7fffffff
+
+/* Check if timer's expiry time is greater than time and care about u32_t wraparounds */
+#define TIME_LESS_THAN(t, compare_to) ( (((u32_t)((t)-(compare_to))) > LWIP_MAX_TIMEOUT) ? 1 : 0 )
+
+/** This array contains all stack-internal cyclic timers. To get the number of
+ * timers, use LWIP_ARRAYSIZE() */
+const struct lwip_cyclic_timer lwip_cyclic_timers[] = {
+#if LWIP_TCP
+  /* The TCP timer is a special case: it does not have to run always and
+     is triggered to start from TCP using tcp_timer_needed() */
+  {TCP_TMR_INTERVAL, HANDLER(tcp_tmr)},
+#endif /* LWIP_TCP */
+#if LWIP_IPV4
+#if IP_REASSEMBLY
+  {IP_TMR_INTERVAL, HANDLER(ip_reass_tmr)},
+#endif /* IP_REASSEMBLY */
+#if LWIP_ARP
+  {ARP_TMR_INTERVAL, HANDLER(etharp_tmr)},
+#endif /* LWIP_ARP */
+#if LWIP_DHCP
+  {DHCP_COARSE_TIMER_MSECS, HANDLER(dhcp_coarse_tmr)},
+  {DHCP_FINE_TIMER_MSECS, HANDLER(dhcp_fine_tmr)},
+#endif /* LWIP_DHCP */
+#if LWIP_AUTOIP
+  {AUTOIP_TMR_INTERVAL, HANDLER(autoip_tmr)},
+#endif /* LWIP_AUTOIP */
+#if LWIP_IGMP
+  {IGMP_TMR_INTERVAL, HANDLER(igmp_tmr)},
+#endif /* LWIP_IGMP */
+#endif /* LWIP_IPV4 */
+#if LWIP_DNS
+  {DNS_TMR_INTERVAL, HANDLER(dns_tmr)},
+#endif /* LWIP_DNS */
+#if LWIP_IPV6
+  {ND6_TMR_INTERVAL, HANDLER(nd6_tmr)},
+#if LWIP_IPV6_REASS
+  {IP6_REASS_TMR_INTERVAL, HANDLER(ip6_reass_tmr)},
+#endif /* LWIP_IPV6_REASS */
+#if LWIP_IPV6_MLD
+  {MLD6_TMR_INTERVAL, HANDLER(mld6_tmr)},
+#endif /* LWIP_IPV6_MLD */
+#if LWIP_IPV6_DHCP6
+  {DHCP6_TIMER_MSECS, HANDLER(dhcp6_tmr)},
+#endif /* LWIP_IPV6_DHCP6 */
+#endif /* LWIP_IPV6 */
+};
+const int lwip_num_cyclic_timers = LWIP_ARRAYSIZE(lwip_cyclic_timers);
+
+#if LWIP_TIMERS && !LWIP_TIMERS_CUSTOM
+
+/** The one and only timeout list */
+static struct sys_timeo *next_timeout;
+
+static u32_t current_timeout_due_time;
+
+#if LWIP_TESTMODE
+struct sys_timeo**
+sys_timeouts_get_next_timeout(void)
+{
+  return &next_timeout;
+}
+#endif
+
+#if LWIP_TCP
+/** global variable that shows if the tcp timer is currently scheduled or not */
+static int tcpip_tcp_timer_active;
+
+/**
+ * Timer callback function that calls tcp_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+tcpip_tcp_timer(void *arg)
+{
+  LWIP_UNUSED_ARG(arg);
+
+  /* call TCP timer handler */
+  tcp_tmr();
+  /* timer still needed? */
+  if (tcp_active_pcbs || tcp_tw_pcbs) {
+    /* restart timer */
+    sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
+  } else {
+    /* disable timer */
+    tcpip_tcp_timer_active = 0;
+  }
+}
+
+/**
+ * Called from TCP_REG when registering a new PCB:
+ * the reason is to have the TCP timer only running when
+ * there are active (or time-wait) PCBs.
+ */
+void
+tcp_timer_needed(void)
+{
+  LWIP_ASSERT_CORE_LOCKED();
+
+  /* timer is off but needed again? */
+  if (!tcpip_tcp_timer_active && (tcp_active_pcbs || tcp_tw_pcbs)) {
+    /* enable and start timer */
+    tcpip_tcp_timer_active = 1;
+    sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
+  }
+}
+#endif /* LWIP_TCP */
+
+static void
+#if LWIP_DEBUG_TIMERNAMES
+sys_timeout_abs(u32_t abs_time, sys_timeout_handler handler, void *arg, const char *handler_name)
+#else /* LWIP_DEBUG_TIMERNAMES */
+sys_timeout_abs(u32_t abs_time, sys_timeout_handler handler, void *arg)
+#endif
+{
+  struct sys_timeo *timeout, *t;
+
+  timeout = (struct sys_timeo *)memp_malloc(MEMP_SYS_TIMEOUT);
+  if (timeout == NULL) {
+    LWIP_ASSERT("sys_timeout: timeout != NULL, pool MEMP_SYS_TIMEOUT is empty", timeout != NULL);
+    return;
+  }
+
+  timeout->next = NULL;
+  timeout->h = handler;
+  timeout->arg = arg;
+  timeout->time = abs_time;
+
+#if LWIP_DEBUG_TIMERNAMES
+  timeout->handler_name = handler_name;
+  LWIP_DEBUGF(TIMERS_DEBUG, ("sys_timeout: %p abs_time=%"U32_F" handler=%s arg=%p\n",
+                             (void *)timeout, abs_time, handler_name, (void *)arg));
+#endif /* LWIP_DEBUG_TIMERNAMES */
+
+  if (next_timeout == NULL) {
+    next_timeout = timeout;
+    return;
+  }
+  if (TIME_LESS_THAN(timeout->time, next_timeout->time)) {
+    timeout->next = next_timeout;
+    next_timeout = timeout;
+  } else {
+    for (t = next_timeout; t != NULL; t = t->next) {
+      if ((t->next == NULL) || TIME_LESS_THAN(timeout->time, t->next->time)) {
+        timeout->next = t->next;
+        t->next = timeout;
+        break;
+      }
+    }
+  }
+}
+
+/**
+ * Timer callback function that calls cyclic->handler() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+#if !LWIP_TESTMODE
+static
+#endif
+void
+lwip_cyclic_timer(void *arg)
+{
+  u32_t now;
+  u32_t next_timeout_time;
+  const struct lwip_cyclic_timer *cyclic = (const struct lwip_cyclic_timer *)arg;
+
+#if LWIP_DEBUG_TIMERNAMES
+  LWIP_DEBUGF(TIMERS_DEBUG, ("tcpip: %s()\n", cyclic->handler_name));
+#endif
+  cyclic->handler();
+
+  now = sys_now();
+  next_timeout_time = (u32_t)(current_timeout_due_time + cyclic->interval_ms);  /* overflow handled by TIME_LESS_THAN macro */ 
+  if (TIME_LESS_THAN(next_timeout_time, now)) {
+    /* timer would immediately expire again -> "overload" -> restart without any correction */
+#if LWIP_DEBUG_TIMERNAMES
+    sys_timeout_abs((u32_t)(now + cyclic->interval_ms), lwip_cyclic_timer, arg, cyclic->handler_name);
+#else
+    sys_timeout_abs((u32_t)(now + cyclic->interval_ms), lwip_cyclic_timer, arg);
+#endif
+
+  } else {
+    /* correct cyclic interval with handler execution delay and sys_check_timeouts jitter */
+#if LWIP_DEBUG_TIMERNAMES
+    sys_timeout_abs(next_timeout_time, lwip_cyclic_timer, arg, cyclic->handler_name);
+#else
+    sys_timeout_abs(next_timeout_time, lwip_cyclic_timer, arg);
+#endif
+  }
+}
+
+/** Initialize this module */
+void sys_timeouts_init(void)
+{
+  size_t i;
+  /* tcp_tmr() at index 0 is started on demand */
+  for (i = (LWIP_TCP ? 1 : 0); i < LWIP_ARRAYSIZE(lwip_cyclic_timers); i++) {
+    /* we have to cast via size_t to get rid of const warning
+      (this is OK as cyclic_timer() casts back to const* */
+    sys_timeout(lwip_cyclic_timers[i].interval_ms, lwip_cyclic_timer, LWIP_CONST_CAST(void *, &lwip_cyclic_timers[i]));
+  }
+}
+
+/**
+ * Create a one-shot timer (aka timeout). Timeouts are processed in the
+ * following cases:
+ * - while waiting for a message using sys_timeouts_mbox_fetch()
+ * - by calling sys_check_timeouts() (NO_SYS==1 only)
+ *
+ * @param msecs time in milliseconds after that the timer should expire
+ * @param handler callback function to call when msecs have elapsed
+ * @param arg argument to pass to the callback function
+ */
+#if LWIP_DEBUG_TIMERNAMES
+void
+sys_timeout_debug(u32_t msecs, sys_timeout_handler handler, void *arg, const char *handler_name)
+#else /* LWIP_DEBUG_TIMERNAMES */
+void
+sys_timeout(u32_t msecs, sys_timeout_handler handler, void *arg)
+#endif /* LWIP_DEBUG_TIMERNAMES */
+{
+  u32_t next_timeout_time;
+
+  LWIP_ASSERT_CORE_LOCKED();
+
+  LWIP_ASSERT("Timeout time too long, max is LWIP_UINT32_MAX/4 msecs", msecs <= (LWIP_UINT32_MAX / 4));
+
+  next_timeout_time = (u32_t)(sys_now() + msecs); /* overflow handled by TIME_LESS_THAN macro */ 
+
+#if LWIP_DEBUG_TIMERNAMES
+  sys_timeout_abs(next_timeout_time, handler, arg, handler_name);
+#else
+  sys_timeout_abs(next_timeout_time, handler, arg);
+#endif
+}
+
+/**
+ * Go through timeout list (for this task only) and remove the first matching
+ * entry (subsequent entries remain untouched), even though the timeout has not
+ * triggered yet.
+ *
+ * @param handler callback function that would be called by the timeout
+ * @param arg callback argument that would be passed to handler
+*/
+void
+sys_untimeout(sys_timeout_handler handler, void *arg)
+{
+  struct sys_timeo *prev_t, *t;
+
+  LWIP_ASSERT_CORE_LOCKED();
+
+  if (next_timeout == NULL) {
+    return;
+  }
+
+  for (t = next_timeout, prev_t = NULL; t != NULL; prev_t = t, t = t->next) {
+    if ((t->h == handler) && (t->arg == arg)) {
+      /* We have a match */
+      /* Unlink from previous in list */
+      if (prev_t == NULL) {
+        next_timeout = t->next;
+      } else {
+        prev_t->next = t->next;
+      }
+      memp_free(MEMP_SYS_TIMEOUT, t);
+      return;
+    }
+  }
+  return;
+}
+
+/**
+ * @ingroup lwip_nosys
+ * Handle timeouts for NO_SYS==1 (i.e. without using
+ * tcpip_thread/sys_timeouts_mbox_fetch(). Uses sys_now() to call timeout
+ * handler functions when timeouts expire.
+ *
+ * Must be called periodically from your main loop.
+ */
+void
+sys_check_timeouts(void)
+{
+  u32_t now;
+
+  LWIP_ASSERT_CORE_LOCKED();
+
+  /* Process only timers expired at the start of the function. */
+  now = sys_now();
+
+  do {
+    struct sys_timeo *tmptimeout;
+    sys_timeout_handler handler;
+    void *arg;
+
+    PBUF_CHECK_FREE_OOSEQ();
+
+    tmptimeout = next_timeout;
+    if (tmptimeout == NULL) {
+      return;
+    }
+
+    if (TIME_LESS_THAN(now, tmptimeout->time)) {
+      return;
+    }
+
+    /* Timeout has expired */
+    next_timeout = tmptimeout->next;
+    handler = tmptimeout->h;
+    arg = tmptimeout->arg;
+    current_timeout_due_time = tmptimeout->time;
+#if LWIP_DEBUG_TIMERNAMES
+    if (handler != NULL) {
+      LWIP_DEBUGF(TIMERS_DEBUG, ("sct calling h=%s t=%"U32_F" arg=%p\n",
+                                 tmptimeout->handler_name, sys_now() - tmptimeout->time, arg));
+    }
+#endif /* LWIP_DEBUG_TIMERNAMES */
+    memp_free(MEMP_SYS_TIMEOUT, tmptimeout);
+    if (handler != NULL) {
+      handler(arg);
+    }
+    LWIP_TCPIP_THREAD_ALIVE();
+
+    /* Repeat until all expired timers have been called */
+  } while (1);
+}
+
+/** Rebase the timeout times to the current time.
+ * This is necessary if sys_check_timeouts() hasn't been called for a long
+ * time (e.g. while saving energy) to prevent all timer functions of that
+ * period being called.
+ */
+void
+sys_restart_timeouts(void)
+{
+  u32_t now;
+  u32_t base;
+  struct sys_timeo *t;
+
+  if (next_timeout == NULL) {
+    return;
+  }
+
+  now = sys_now();
+  base = next_timeout->time;
+
+  for (t = next_timeout; t != NULL; t = t->next) {
+    t->time = (t->time - base) + now;
+  }
+}
+
+/** Return the time left before the next timeout is due. If no timeouts are
+ * enqueued, returns 0xffffffff
+ */
+u32_t
+sys_timeouts_sleeptime(void)
+{
+  u32_t now;
+
+  LWIP_ASSERT_CORE_LOCKED();
+
+  if (next_timeout == NULL) {
+    return SYS_TIMEOUTS_SLEEPTIME_INFINITE;
+  }
+  now = sys_now();
+  if (TIME_LESS_THAN(next_timeout->time, now)) {
+    return 0;
+  } else {
+    u32_t ret = (u32_t)(next_timeout->time - now);
+    LWIP_ASSERT("invalid sleeptime", ret <= LWIP_MAX_TIMEOUT);
+    return ret;
+  }
+}
+
+#else /* LWIP_TIMERS && !LWIP_TIMERS_CUSTOM */
+/* Satisfy the TCP code which calls this function */
+void
+tcp_timer_needed(void)
+{
+}
+#endif /* LWIP_TIMERS && !LWIP_TIMERS_CUSTOM */
@@ -0,0 +1,192 @@
+/*
+ * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef __DHCPS_H__
+#define __DHCPS_H__
+
+//#include "sdkconfig.h"
+#include <stdbool.h>
+#include "lwip/ip_addr.h"
+#include "lwip/err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct dhcps_state{
+        s16_t state;
+} dhcps_state;
+
+typedef struct dhcps_msg {
+        uint8_t op, htype, hlen, hops;// operation code, hw type, hw addr len, hops
+        uint8_t xid[4];// transaction id
+        uint16_t secs, flags;           // seconds, flags
+        uint8_t ciaddr[4];// client ip addr
+        uint8_t yiaddr[4];// your ip addr
+        uint8_t siaddr[4];// server ip addr
+        uint8_t giaddr[4];// GW ip
+        uint8_t chaddr[16];// client hw address
+        uint8_t sname[64];// server name
+        uint8_t file[128];// boot filename
+        uint8_t options[312];
+}dhcps_msg;
+
+/*   Defined in esp_misc.h */
+typedef struct {
+	bool enable;
+	ip4_addr_t start_ip;
+	ip4_addr_t end_ip;
+} dhcps_lease_t;
+
+enum dhcps_offer_option{
+	OFFER_START = 0x00,
+	OFFER_ROUTER = 0x01,
+	OFFER_DNS = 0x02,
+	OFFER_END
+};
+
+/** @brief DHCP server's description of compile time configuration values in dhcpserver.c
+ *
+ * - DHCPS_DEBUG: Prints very detailed debug messages if set to 1, hardcoded to 0
+ * - USE_CLASS_B_NET: Use class B network mask if enabled, not-defined (could be enabled as CC_FLAGS)
+ * - MAX_STATION_NUM: Maximum number of clients, set to Kconfig value CONFIG_LWIP_DHCPS_MAX_STATION_NUM
+ * - LWIP_HOOK_DHCPS_POST_STATE: Used to inject user code after parsing DHCP message, not defined
+ *      - could be enabled in lwipopts.h or via CC_FLAGS
+ *      - basic usage of the hook to print hex representation of the entire option field is below:
+ *          #define LWIP_HOOK_DHCPS_POST_STATE(msg, len, state) \
+ *          ({ s16_t ret = state; if (state == DHCPS_STATE_ACK) { ESP_LOG_BUFFER_HEXDUMP("DHCPS",msg->options, 312, ESP_LOG_INFO);} ret; })
+ */
+
+/**
+ * @brief Definitions related to lease time, units and limits
+ */
+#define DHCPS_COARSE_TIMER_SECS  1
+#define DHCPS_MAX_LEASE 0x64
+#define DHCPS_LEASE_TIME_DEF (120)
+#define DHCPS_LEASE_UNIT CONFIG_LWIP_DHCPS_LEASE_UNIT
+
+struct dhcps_pool{
+	ip4_addr_t ip;
+	u8_t mac[6];
+	u32_t lease_timer;
+};
+
+typedef u32_t dhcps_time_t;
+typedef u8_t dhcps_offer_t;
+
+typedef struct {
+        dhcps_offer_t dhcps_offer;
+        dhcps_offer_t dhcps_dns;
+        dhcps_time_t  dhcps_time;
+        dhcps_lease_t dhcps_poll;
+} dhcps_options_t;
+
+typedef void (*dhcps_cb_t)(void* cb_arg, u8_t client_ip[4], u8_t client_mac[6]);
+
+static inline bool dhcps_router_enabled (dhcps_offer_t offer)
+{
+    return (offer & OFFER_ROUTER) != 0;
+}
+
+static inline bool dhcps_dns_enabled (dhcps_offer_t offer)
+{
+    return (offer & OFFER_DNS) != 0;
+}
+
+typedef struct dhcps_t dhcps_t;
+
+/**
+ * @brief Creates new DHCP server object
+ *
+ * @return Pointer to the DHCP server handle on success, NULL on error
+ */
+dhcps_t *dhcps_new(void);
+
+/**
+ * @brief Deletes supplied DHPC server object
+ *
+ * @warning This may not delete the handle immediately if the server wasn't
+ * stopped properly, but mark for deleting once the timer callback occurs
+ *
+ * @param dhcps Pointer to the DHCP handle
+ */
+void dhcps_delete(dhcps_t *dhcps);
+
+/**
+ * @brief Starts the DHCP server on the specified network interface
+ *
+ * @param dhcps Pointer to the DHCP handle
+ * @param netif Pointer to the lwIP's network interface struct
+ * @param ip DHCP server's address
+ * @return ERR_ARG if invalid args, ERR_OK on success
+ */
+err_t dhcps_start(dhcps_t *dhcps, struct netif *netif, ip4_addr_t ip);
+
+/**
+ * @brief Stops the DHCP server on the specified netif
+ * @param dhcps Pointer to the DHCP handle
+ * @param netif Pointer to the lwIP's network interface struct
+ * @return ERR_ARG if invalid args, ERR_OK on success
+ */
+err_t dhcps_stop(dhcps_t *dhcps, struct netif *netif);
+
+/**
+ * @brief Gets the DHCP server option info
+ * @param dhcps Pointer to the DHCP handle
+ * @param op_id DHCP message option id
+ * @param opt_len DHCP message option length
+ * @return DHCP message option addr
+ */
+void *dhcps_option_info(dhcps_t *dhcps, u8_t op_id, u32_t opt_len);
+
+/**
+ * @brief Sets the DHCP server option info
+ * @param dhcps Pointer to the DHCP handle
+ * @param op_id DHCP message option id
+ * @param opt_info DHCP message option info
+ * @param opt_len DHCP message option length
+ * @return ERR_ARG if invalid args, ERR_OK on success
+ */
+err_t dhcps_set_option_info(dhcps_t *dhcps, u8_t op_id, void *opt_info, u32_t opt_len);
+
+/**
+ * @brief Tries to find IP address corresponding to the supplied MAC
+ * @param dhcps Pointer to the DHCP handle
+ * @param mac Supplied MAC address
+ * @param ip Pointer to the resultant IP address
+ * @return True if the IP address has been found
+ */
+bool dhcp_search_ip_on_mac(dhcps_t *dhcps, u8_t *mac, ip4_addr_t *ip);
+
+/**
+ * @brief Sets DNS server address for the DHCP server
+ * @param dhcps Pointer to the DHCP handle
+ * @param dnsserver Address of the DNS server
+ * @return ERR_ARG if invalid handle, ERR_OK on success
+ */
+err_t dhcps_dns_setserver(dhcps_t *dhcps, const ip_addr_t *dnsserver);
+
+/**
+ * @brief Gets DNS server associated with this DHCP server
+ * @param dhcps Pointer to the DHCP handle
+ * @param dnsserver Address of the DNS server
+ * @return ERR_ARG if invalid handle, ERR_OK on success
+ */
+err_t dhcps_dns_getserver(dhcps_t *dhcps, ip4_addr_t *dnsserver);
+
+/**
+ * @brief Sets callback on assigning an IP to the connected client
+ * @param dhcps Pointer to the DHCP handle
+ * @param cb Callback for dhcp server
+ * @param cb_arg Context pointer to be added to the callback
+ * @return ERR_ARG if invalid handle, ERR_OK on success
+ */
+err_t dhcps_set_new_lease_cb(dhcps_t *dhcps, dhcps_cb_t cb, void* cb_arg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __DHCPS_H__ */
@@ -0,0 +1,147 @@
+// Copyright 2017 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#pragma once
+
+#define ESP_DHCPS 1
+#define DHCP_COARSE_TIMER_MSECS 1000
+#define CONFIG_LWIP_DHCPS_MAX_STATION_NUM 500
+#define DHCPS_LEASE_UNIT 1000
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+/** DHCP Options
+
+    This macros are not part of the public dhcpserver.h interface.
+ **/
+typedef enum
+{
+    /* RFC 1497 Vendor Extensions */
+
+    PAD = 0,
+    END = 255,
+
+    SUBNET_MASK = 1,
+    TIME_OFFSET = 2,
+    ROUTER = 3,
+    TIME_SERVER = 4,
+    NAME_SERVER = 5,
+    DOMAIN_NAME_SERVER = 6,
+    LOG_SERVER = 7,
+    COOKIE_SERVER = 8,
+    LPR_SERVER = 9,
+    IMPRESS_SERVER = 10,
+    RESOURCE_LOCATION_SERVER = 11,
+    HOST_NAME = 12,
+    BOOT_FILE_SIZE = 13,
+    MERIT_DUMP_FILE = 14,
+    DOMAIN_NAME = 15,
+    SWAP_SERVER = 16,
+    ROOT_PATH = 17,
+    EXTENSIONS_PATH = 18,
+
+    /* IP Layer Parameters per Host */
+
+    IP_FORWARDING = 19,
+    NON_LOCAL_SOURCE_ROUTING = 20,
+    POLICY_FILTER = 21,
+    MAXIMUM_DATAGRAM_REASSEMBLY_SIZE = 22,
+    DEFAULT_IP_TIME_TO_LIVE = 23,
+    PATH_MTU_AGING_TIMEOUT = 24,
+    PATH_MTU_PLATEAU_TABLE = 25,
+
+    /* IP Layer Parameters per Interface */
+
+    INTERFACE_MTU = 26,
+    ALL_SUBNETS_ARE_LOCAL = 27,
+    BROADCAST_ADDRESS = 28,
+    PERFORM_MASK_DISCOVERY = 29,
+    MASK_SUPPLIER = 30,
+    PERFORM_ROUTER_DISCOVERY = 31,
+    ROUTER_SOLICITATION_ADDRESS = 32,
+    STATIC_ROUTE = 33,
+
+    /* Link Layer Parameters per Interface */
+
+    TRAILER_ENCAPSULATION = 34,
+    ARP_CACHE_TIMEOUT = 35,
+    ETHERNET_ENCAPSULATION = 36,
+
+    /* TCP Parameters */
+
+    TCP_DEFAULT_TTL = 37,
+    TCP_KEEPALIVE_INTERVAL = 38,
+    TCP_KEEPALIVE_GARBAGE = 39,
+
+    /* Application and Service Parameters */
+
+    NETWORK_INFORMATION_SERVICE_DOMAIN = 40,
+    NETWORK_INFORMATION_SERVERS = 41,
+    NETWORK_TIME_PROTOCOL_SERVERS = 42,
+    VENDOR_SPECIFIC_INFORMATION = 43,
+    NETBIOS_OVER_TCP_IP_NAME_SERVER = 44,
+    NETBIOS_OVER_TCP_IP_DATAGRAM_DISTRIBUTION_SERVER = 45,
+    NETBIOS_OVER_TCP_IP_NODE_TYPE = 46,
+    NETBIOS_OVER_TCP_IP_SCOPE = 47,
+    X_WINDOW_SYSTEM_FONT_SERVER = 48,
+    X_WINDOW_SYSTEM_DISPLAY_MANAGER = 49,
+    NETWORK_INFORMATION_SERVICE_PLUS_DOMAIN = 64,
+    NETWORK_INFORMATION_SERVICE_PLUS_SERVERS = 65,
+    MOBILE_IP_HOME_AGENT = 68,
+    SMTP_SERVER = 69,
+    POP3_SERVER = 70,
+    NNTP_SERVER = 71,
+    DEFAULT_WWW_SERVER = 72,
+    DEFAULT_FINGER_SERVER = 73,
+    DEFAULT_IRC_SERVER = 74,
+    STREETTALK_SERVER = 75,
+    STREETTALK_DIRECTORY_ASSISTANCE_SERVER = 76,
+
+    /* DHCP Extensions */
+
+    REQUESTED_IP_ADDRESS = 50,
+    IP_ADDRESS_LEASE_TIME = 51,
+    OPTION_OVERLOAD = 52,
+    TFTP_SERVER_NAME = 66,
+    BOOTFILE_NAME = 67,
+    DHCP_MESSAGE_TYPE = 53,
+    SERVER_IDENTIFIER = 54,
+    PARAMETER_REQUEST_LIST = 55,
+    MESSAGE = 56,
+    MAXIMUM_DHCP_MESSAGE_SIZE = 57,
+    RENEWAL_T1_TIME_VALUE = 58,
+    REBINDING_T2_TIME_VALUE = 59,
+    VENDOR_CLASS_IDENTIFIER = 60,
+    CLIENT_IDENTIFIER = 61,
+
+    USER_CLASS = 77,
+    FQDN = 81,
+    DHCP_AGENT_OPTIONS = 82,
+    NDS_SERVERS = 85,
+    NDS_TREE_NAME = 86,
+    NDS_CONTEXT = 87,
+    CLIENT_LAST_TRANSACTION_TIME = 91,
+    ASSOCIATED_IP = 92,
+    USER_AUTHENTICATION_PROTOCOL = 98,
+    AUTO_CONFIGURE = 116,
+    NAME_SERVICE_SEARCH = 117,
+    SUBNET_SELECTION = 118,
+    DOMAIN_SEARCH = 119,
+    CLASSLESS_ROUTE = 121,
+} dhcp_msg_option;
+
+#ifdef __cplusplus
+}
+#endif
@@ -0,0 +1,255 @@
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include "lwip/opt.h"
+#include "lwip/udp.h"
+#include "lwip/mem.h"
+#include "dnsproxy.h"
+#include "eth_router.h"
+#include "eth_queue.h"
+
+static u8_t mdns_payload[DNS_MSG_SIZE];
+
+static struct udp_pcb *pdns_pcb = NULL;
+
+struct ETH_Q dns_q;
+
+static struct NHandle_t tNotifyHandle;
+static pthread_t tHandle;
+
+#define MDNS_MAX_NAME_LENGTH      (256)
+
+struct __attribute__((__packed__)) mdns_hdr {
+	u16_t id;
+	u8_t  flags1;
+	u8_t  flags2;
+	u16_t numquestions;
+	u16_t numanswers;
+	u16_t numauthrr;
+	u16_t numextrarr;
+};
+
+#define SIZEOF_DNS_HDR 12
+
+struct __attribute__((__packed__)) mdns_query {
+	/* MDNS query record starts with either a domain name or a pointer
+	 to a name already present somewhere in the packet. */
+    u16_t type;
+	u16_t class;
+};
+
+#define SIZEOF_DNS_QUERY 4
+
+struct __attribute__((__packed__)) mdns_answer {
+	/* MDNS answer record starts with either a domain name or a pointer
+	 to a name already present somewhere in the packet. */
+    u16_t type;
+	u16_t class;
+	u32_t ttl;
+	u16_t len;
+};
+#define SIZEOF_DNS_ANSWER 10
+
+struct DNS_RECORD {
+    uint16_t query_type;
+    uint16_t query_class;
+    uint8_t name[512];
+    uint32_t ip;
+    uint16_t port;
+    uint16_t id;
+};
+
+static int query_decode(uint8_t* query, int len, struct DNS_RECORD* out) {
+  int pos=0;
+  int outpos=0;
+  do {
+    if (pos>=len) return -1;
+    uint8_t nlen=query[pos++];
+    if (nlen==0) break;
+    if (outpos+nlen>=sizeof(out->name)-1) return -1;
+    if (pos+nlen>len) return -1;
+    for (int i=0; i<nlen; i++) out->name[outpos++]=query[pos++];
+    out->name[outpos++]='.';
+    } while(1);
+  if (pos+4>len) return -1;
+  if (outpos>0) outpos--;
+  out->name[outpos]=0;
+  out->query_type=(query[pos]<<8)+query[pos+1];
+  out->query_class=(query[pos+2]<<8)+query[pos+3];
+  return pos+4;
+  }
+
+static void pdns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *iaddr, u16_t port) {
+	u8_t i;
+	struct mdns_hdr *hdr;
+	u8_t nquestions;
+	LWIP_UNUSED_ARG(arg);
+	LWIP_UNUSED_ARG(pcb);
+	struct mdns_info *info = (struct mdns_info *)arg;
+	/* is the dns message too big ? */
+	if (p->tot_len > DNS_MSG_SIZE) {
+		LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too big\n"));
+		/* free pbuf and return */
+		goto memerr1;
+	}
+
+	/* is the dns message big enough ? */
+	if (p->tot_len < (SIZEOF_DNS_HDR + SIZEOF_DNS_QUERY + SIZEOF_DNS_ANSWER)) {
+		LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too small\n"));
+		/* free pbuf and return */
+		goto memerr1;
+	}
+	/* copy dns payload inside static buffer for processing */
+	if (pbuf_copy_partial(p, mdns_payload, p->tot_len, 0) != p->tot_len) goto memerr1;
+
+	hdr = (struct mdns_hdr*) mdns_payload;
+    uint8_t* data=(uint8_t*) mdns_payload + SIZEOF_DNS_HDR;
+
+    struct ETH_PBUF* p_req=eth_pbuf_alloc(&xeth_pbuf_ctrl, NULL);
+    if (p_req==NULL) goto memerr1;
+
+    print_log("DNS request: id=%04X fg1=%02X fg2=%02X nq=%d na=%d", htons(hdr->id), hdr->flags1, hdr->flags2, htons(hdr->numquestions), htons(hdr->numanswers));
+    int num_q=htons(hdr->numquestions);
+    int num_a=htons(hdr->numanswers);
+    if (num_a!=0) goto memerr2;
+    if (num_q!=1) goto memerr2;
+    int remain_len=p->tot_len-SIZEOF_DNS_HDR;
+    struct DNS_RECORD* rec=(struct DNS_RECORD*)p_req->pbuf.payload;
+    int len=query_decode(data, remain_len, rec);
+    if (len<0) goto memerr2;
+    rec->id=htons(hdr->id);
+    rec->ip=*(uint32_t*)iaddr;
+    rec->port=port;
+    print_log("DNS request: <%s> from ip=%d.%d.%d.%d port=%d", rec->name, (rec->ip)&0xff, (rec->ip>>8)&0xff, (rec->ip>>16)&0xff, (rec->ip>>24)&0xff, rec->port);
+    add_to_custom_queue(&p_req->pbuf, &dns_q);
+    TNotifyAdd( &tNotifyHandle, 1);
+
+    goto memerr1;
+memerr2:
+    eth_pbuf_free_request(p_req);
+memerr1:
+	pbuf_free(p);
+	return;
+    }
+// a a a . b b b . c c c 0
+// 3 a a a 3 b b b 3 c c c 0
+// 0 1 2 3 4 5 6 7 8 9 B C D
+    int dns_encode_name(uint8_t* dst, uint8_t* str) {
+    int pos=0;
+    int cnt=0;
+    do {
+        if (str[pos]=='.') { dst[pos-cnt]=cnt; cnt=0; pos++; continue;}
+        if (str[pos]==0) { dst[pos-cnt]=cnt; dst[pos+1]=0; pos+=2; break; }
+        dst[pos+1]=str[pos];
+        pos++; cnt++;
+    } while(1);
+    return pos;
+    }
+
+_Noreturn void dnsproxy_thread(void* arg) {
+
+  struct pbuf* p;
+  while (1) {
+    uint32_t res=TNotifyWait( &tNotifyHandle );
+    do {
+     p=get_from_custom_queue(&dns_q);
+     if (p==NULL) break;
+
+     struct DNS_RECORD* rec=(struct DNS_RECORD*)p->payload;
+
+     int status;
+     struct addrinfo hints;
+     struct addrinfo *servinfo;  // указатель на результаты
+     memset(&hints, 0, sizeof hints); // убедимся, что структура пуста
+     hints.ai_family = PF_INET;//AF_UNSPEC - AF_INET;     // неважно, IPv4 или IPv6
+     hints.ai_socktype = SOCK_STREAM; // TCP stream-sockets
+     hints.ai_flags = AI_PASSIVE;     // заполните мой IP-адрес за меняif ((status = getaddrinfo(NULL, «3490», &hints, &servinfo)) != 0) {
+     status = getaddrinfo(rec->name, NULL, &hints, &servinfo);// servinfo теперь —
+     if (status==0 && servinfo->ai_family==AF_INET) {
+         uint8_t* ip=(uint8_t*)&((struct sockaddr_in *)servinfo->ai_addr)->sin_addr;
+         print_log("DNS query service: <%s> IP=%d.%d.%d.%d", rec->name, ip[0], ip[1], ip[2], ip[3]);
+
+         struct pbuf* p1 = pbuf_alloc(PBUF_TRANSPORT, 1400, PBUF_RAM);
+         if (p1 != NULL) {
+             int pos=0;
+             struct mdns_hdr* hdr=p1->payload;
+             hdr->id=htons(rec->id);
+             hdr->flags1=0x81;
+             hdr->flags2=0x80;
+             //        FLAGS1    FLAGS2      Flags: 0x8180 Standard query response, No error
+             //        1... .... .... .... = Response: Message is a response
+             //        .000 0... .... .... = Opcode: Standard query (0)
+             //        .... .0.. .... .... = Authoritative: Server is not an authority for domain
+             //        .... ..0. .... .... = Truncated: Message is not truncated
+             //        .... ...1 .... .... = Recursion desired: Do query recursively
+             //        .... .... 1... .... = Recursion available: Server can do recursive queries
+             //        .... .... .0.. .... = Z: reserved (0)
+             //        .... .... ..0. .... = Answer authenticated: Answer/authority portion was not authenticated by the server
+             //        .... .... ...0 .... = Non-authenticated data: Unacceptable
+             //        .... .... .... 0000 = Reply code: No error (0)
+
+             hdr->numquestions=htons(1);
+             hdr->numanswers=htons(1);
+             hdr->numauthrr=htons(0);
+             hdr->numextrarr=htons(0);
+             uint8_t dpos=sizeof(struct mdns_hdr);
+             uint8_t* rsp=(uint8_t*)p1->payload;
+             int ret=dns_encode_name(rsp+dpos, rec->name);
+             if (ret>0) {
+                 dpos += ret;
+                 rsp[dpos++]=0;// TYPE
+                 rsp[dpos++]=1;
+                 rsp[dpos++]=0;// CLASS
+                 rsp[dpos++]=1;
+                 rsp[dpos++]=0xc0;// answer: name
+                 rsp[dpos++]=0x0c;
+                 rsp[dpos++]=0;// type
+                 rsp[dpos++]=1;
+                 rsp[dpos++]=0;// class
+                 rsp[dpos++]=1;
+                 rsp[dpos++]=0;// TTL
+                 rsp[dpos++]=0;// TTL
+                 rsp[dpos++]=0x27;// TTL
+                 rsp[dpos++]=0x10;// TTL
+                 rsp[dpos++]=0;// data length
+                 rsp[dpos++]=4;// data length
+                 rsp[dpos++]=ip[0];
+                 rsp[dpos++]=ip[1];
+                 rsp[dpos++]=ip[2];
+                 rsp[dpos++]=ip[3];
+                 p1->len=dpos;
+                 p1->tot_len=dpos;
+                 char ans[3000]; int pt=0;
+                 for (int i=0; i<dpos; i++) {pt+=sprintf(ans+pt,"%02X ",rsp[i]);}
+                 print_log("DNS answer: <%s>", ans);
+                 udp_sendto(pdns_pcb, p1, &rec->ip, rec->port);
+             }
+             pbuf_free(p1);
+         }
+
+         } else print_log("DNS query err (status=%d)", status);
+     pbuf_free(p);
+     } while(1);
+
+    }
+
+  }
+
+
+void dnsproxy_init() {
+  dns_q.q_len_max=5;
+  int ret;
+  pdns_pcb = udp_new();
+  if (pdns_pcb) {
+	ret=udp_bind(pdns_pcb, IP_ADDR_ANY, 53);
+    if (ret) return;
+    udp_recv(pdns_pcb, pdns_recv, NULL);
+    }
+
+  TaskCreate (dnsproxy_thread, &tHandle);
+  TNotifyCreate(&tNotifyHandle);
+
+  }
@@ -0,0 +1,3 @@
+#define DNS_MSG_SIZE 1500
+
+void dnsproxy_init();
@@ -0,0 +1,150 @@
+// LWIP interface for router
+
+#include <string.h>
+
+#include "lwip/lwip.h"
+#include "lwip/opt.h"
+#include "lwip/timeouts.h"
+#include "netif/ethernet.h"
+#include "netif/etharp.h"
+#include "lwip/tcpip.h"
+
+#include "lwip/pbuf.h"
+
+#include "eth_mem.h"
+#include "eth_router_cfg.h"
+#include "eth_router.h"
+#include "lwip/eth_router_if_lwip.h"
+
+static struct ETH_QUEUEPOOL_CTRL* if_pool=&xeth_queuepool_ctrl;
+
+struct netif* lwip_netif;
+static pthread_t xLWIP_input_task;
+static pthread_t xLWIP_tmr_task;
+struct NHandle_t TTskHandle;
+
+struct ETH_IF_LWIP_STATS eth_if_lwip;
+
+static char if_name[]="LWIP";
+
+struct ETH_PBUF* block_to_send;
+
+
+//#pragma optimize=none
+static err_t lwip_output_to_bridge(struct netif *netif, struct pbuf *p) {
+  if (p->tot_len>ETH_MEM_BUF_SIZE) {
+    eth_if_lwip.in_too_big++;
+    return ERR_OK;
+    }
+  struct ETH_PBUF* block=eth_pbuf_alloc(&xeth_pbuf_ctrl, NULL);
+  if (block==NULL) {
+    eth_if_lwip.in_alloc_errs++;
+    return ERR_OK;
+    }
+  int ptr=0;
+  struct pbuf *frag;
+  for (frag=p; frag!=NULL; frag=frag->next) {// copy datagram payload from LWIP to ETH_MEM pbuf
+    if (frag->len+ptr<=ETH_MEM_BUF_SIZE) memcpy((uint8_t*)block->pbuf.payload+ptr, frag->payload, frag->len);
+    else {
+      eth_pbuf_free_request(block);
+      eth_if_lwip.in_too_big++;
+      return ERR_OK;
+      }
+    ptr+=frag->len;
+    }
+//  print_log("dgram from LWIP, size=%d",ptr);
+  block->pbuf.len=ptr;
+  block->pbuf.tot_len=ptr;
+  block->pbuf.if_idx=LWIP_NETIF_ID;
+  for (int i=0; i<6; i++) ((uint8_t*)(block->pbuf.payload))[i+6]=netif->hwaddr[i];
+
+  eth_add_packet_to_router_queue(block);
+  return ERR_OK;
+  }
+
+
+static void to_lwip_QueueTask(void* arg) {
+  print_log("********** LWIP task started");
+  while (1) {
+    int res=TNotifyWait( &TTskHandle );
+    if (res & 2) {
+      LOCK_LWIP_CORE();
+      sys_check_timeouts();
+      UNLOCK_LWIP_CORE();
+      }
+    if (res & 1) do {
+      if (block_to_send->pbuf.ref==0) while(1);
+
+      int in=0;
+      int err=1;
+      LOCK_LWIP_CORE();
+      if (lwip_netif->input) err=lwip_netif->input(&block_to_send->pbuf, lwip_netif);
+      UNLOCK_LWIP_CORE();
+//      if (err == ERR_OK) in=1;
+//  print_log("dgram to LWIP, size=%d",block_to_send->pbuf.len);
+      if (err != ERR_OK) eth_pbuf_free_request(block_to_send);
+//      if (in==0) {
+//        eth_if_lwip.lwip_out_errs++; eth_if_lwip.lwip_out_err=err;
+//        LOCK_LWIP_CORE();
+//        if (lwip_netif->input) err=lwip_netif->input(&block_to_send->pbuf, lwip_netif);
+//        UNLOCK_LWIP_CORE();
+//        if (err) eth_pbuf_free_request(block_to_send);
+//        }
+        block_to_send=NULL;
+        struct ETH_PBUF* tb=eth_get_packet(&if_pool->eth_netif_array[LWIP_NETIF_ID]);
+        if (tb) block_to_send=tb;
+      } while (block_to_send);
+
+    }
+  }
+
+static void to_lwip_TmrTask(void* arg) {
+  while(1) {
+    TNotifyAdd( &TTskHandle, 2);
+    usleep(1000*100);
+    }
+  }
+
+static void lwip_callback_from_bridge(struct ETH_PBUF* block, struct ETH_NETIF* enetif) {
+  block_to_send=block;
+  TNotifyAdd( &TTskHandle, 1);
+  }
+
+
+err_t eth_lwip_if_init(struct netif *netif) {
+  LWIP_ASSERT("netif != NULL", (netif != NULL));
+  lwip_netif=netif;
+
+  netif->name[0] = 'L';
+  netif->name[1] = 'W';
+
+  print_log("********** LWIP interface init");
+
+  netif->output = etharp_output;
+
+  netif->linkoutput = lwip_output_to_bridge;//low_level_output;
+
+  for (int i=0; i<6; i++) netif->hwaddr[i] = rand();
+  netif->hwaddr[0]=0x00;
+  netif->hwaddr[1]=0x80;
+  netif->hwaddr_len = ETH_HWADDR_LEN;
+  netif->mtu = 1500;//ETH_MAX_PAYLOAD;
+
+  netif->flags |= NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP;
+
+  if (xLWIP_input_task==NULL) {
+    if_pool->eth_netif_array[LWIP_NETIF_ID].callback_fn=lwip_callback_from_bridge;
+    TaskCreate (to_lwip_QueueTask, &xLWIP_input_task);
+    TaskCreate (to_lwip_TmrTask, &xLWIP_tmr_task);
+    TNotifyCreate(&TTskHandle);
+    while ( eth_get_packet(&if_pool->eth_netif_array[LWIP_NETIF_ID]) );
+    }
+
+  if_pool->eth_netif_array[LWIP_NETIF_ID].q_output_len_max=LWIP_NETIF_QLEN;
+  if_pool->eth_netif_array[LWIP_NETIF_ID].if_name=if_name;
+
+  netif_set_up(netif);
+  netif_set_link_up(netif);
+  if_pool->eth_netif_array[LWIP_NETIF_ID].if_up=1;
+  return ERR_OK;
+  }
@@ -0,0 +1,13 @@
+#define LWIP_TASK_STACK_SIZE 1024// x4 bytes
+err_t eth_lwip_if_init(struct netif *netif);
+extern struct netif* lwip_netif;
+
+struct ETH_IF_LWIP_STATS {
+  uint32_t in_frags;
+  uint32_t in_too_big;
+  uint32_t in_alloc_errs;
+  uint32_t lwip_out_errs;
+  err_enum_t lwip_out_err;
+  };
+
+extern struct ETH_IF_LWIP_STATS eth_if_lwip;
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef LWIP_ARCH_CC_H
+#define LWIP_ARCH_CC_H
+
+/* see https://sourceforge.net/p/predef/wiki/OperatingSystems/ */
+#if defined __ANDROID__
+#define LWIP_UNIX_ANDROID
+#elif defined __linux__
+#define LWIP_UNIX_LINUX
+#elif defined __APPLE__
+#define LWIP_UNIX_MACH
+#elif defined __OpenBSD__
+#define LWIP_UNIX_OPENBSD
+#elif defined __CYGWIN__
+#define LWIP_UNIX_CYGWIN
+#elif defined __GNU__
+#define LWIP_UNIX_HURD
+#endif
+
+#define LWIP_TIMEVAL_PRIVATE 0
+#include <sys/time.h>
+
+#define LWIP_ERRNO_INCLUDE <errno.h>
+
+#if defined(LWIP_UNIX_LINUX) || defined(LWIP_UNIX_HURD)
+#define LWIP_ERRNO_STDINCLUDE	1
+#endif
+
+//extern unsigned int lwip_port_rand(void);
+#define LWIP_RAND() (rand())
+
+/* different handling for unit test, normally not needed */
+#ifdef LWIP_NOASSERT_ON_ERROR
+#define LWIP_ERROR(message, expression, handler) do { if (!(expression)) { \
+  handler;}} while(0)
+#endif
+
+#if defined(LWIP_UNIX_ANDROID) && defined(FD_SET)
+//typedef __kernel_fd_set fd_set;
+#endif
+
+#if defined(LWIP_UNIX_MACH)
+/* sys/types.h and signal.h bring in Darwin byte order macros. pull the
+   header here and disable LwIP's version so that apps still can get
+   the macros via LwIP headers and use system headers */
+#include <sys/types.h>
+#define LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS
+#endif
+
+struct sio_status_s;
+typedef struct sio_status_s sio_status_t;
+#define sio_fd_t sio_status_t*
+#define __sio_fd_t_defined
+
+typedef unsigned int sys_prot_t;
+
+#endif /* LWIP_ARCH_CC_H */
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef LWIP_ARCH_PERF_H
+#define LWIP_ARCH_PERF_H
+
+#include <sys/times.h>
+
+#ifdef PERF
+#define PERF_START  { \
+                         unsigned long __c1l, __c1h, __c2l, __c2h; \
+                         __asm__(".byte 0x0f, 0x31" : "=a" (__c1l), "=d" (__c1h))
+#define PERF_STOP(x)   __asm__(".byte 0x0f, 0x31" : "=a" (__c2l), "=d" (__c2h)); \
+                       perf_print(__c1l, __c1h, __c2l, __c2h, x);}
+
+/*#define PERF_START do { \
+                     struct tms __perf_start, __perf_end; \
+                     times(&__perf_start)
+#define PERF_STOP(x) times(&__perf_end); \
+                     perf_print_times(&__perf_start, &__perf_end, x);\
+                     } while(0)*/
+#else /* PERF */
+#define PERF_START    /* null definition */
+#define PERF_STOP(x)  /* null definition */
+#endif /* PERF */
+
+void perf_print(unsigned long c1l, unsigned long c1h,
+		unsigned long c2l, unsigned long c2h,
+		char *key);
+
+void perf_print_times(struct tms *start, struct tms *end, char *key);
+
+void perf_init(char *fname);
+
+#endif /* LWIP_ARCH_PERF_H */
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef LWIP_ARCH_SYS_ARCH_H
+#define LWIP_ARCH_SYS_ARCH_H
+
+#define SYS_MBOX_NULL NULL
+#define SYS_SEM_NULL  NULL
+
+/*typedef u32_t sys_prot_t;*/
+
+struct sys_sem;
+typedef struct sys_sem * sys_sem_t;
+#define sys_sem_valid(sem)             (((sem) != NULL) && (*(sem) != NULL))
+#define sys_sem_valid_val(sem)         ((sem) != NULL)
+#define sys_sem_set_invalid(sem)       do { if((sem) != NULL) { *(sem) = NULL; }}while(0)
+#define sys_sem_set_invalid_val(sem)   do { (sem) = NULL; }while(0)
+
+struct sys_mutex;
+typedef struct sys_mutex * sys_mutex_t;
+#define sys_mutex_valid(mutex)         sys_sem_valid(mutex)
+#define sys_mutex_set_invalid(mutex)   sys_sem_set_invalid(mutex)
+
+struct sys_mbox;
+typedef struct sys_mbox * sys_mbox_t;
+#define sys_mbox_valid(mbox)           sys_sem_valid(mbox)
+#define sys_mbox_valid_val(mbox)       sys_sem_valid_val(mbox)
+#define sys_mbox_set_invalid(mbox)     sys_sem_set_invalid(mbox)
+#define sys_mbox_set_invalid_val(mbox) sys_sem_set_invalid_val(mbox)
+
+struct sys_thread;
+typedef struct sys_thread * sys_thread_t;
+
+#define LWIP_EXAMPLE_APP_ABORT() lwip_unix_keypressed()
+int lwip_unix_keypressed(void);
+
+#endif /* LWIP_ARCH_SYS_ARCH_H */
@@ -0,0 +1,201 @@
+/**
+ * @file
+ * Application layered TCP connection API (to be used from TCPIP thread)\n
+ *
+ * This file contains the generic API.
+ * For more details see @ref altcp_api.
+ */
+
+/*
+ * Copyright (c) 2017 Simon Goldschmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt <goldsimon@gmx.de>
+ *
+ */
+#ifndef LWIP_HDR_ALTCP_H
+#define LWIP_HDR_ALTCP_H
+
+#include "lwip/opt.h"
+
+#if LWIP_ALTCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/tcpbase.h"
+#include "lwip/err.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip_addr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct altcp_pcb;
+struct altcp_functions;
+
+typedef err_t (*altcp_accept_fn)(void *arg, struct altcp_pcb *new_conn, err_t err);
+typedef err_t (*altcp_connected_fn)(void *arg, struct altcp_pcb *conn, err_t err);
+typedef err_t (*altcp_recv_fn)(void *arg, struct altcp_pcb *conn, struct pbuf *p, err_t err);
+typedef err_t (*altcp_sent_fn)(void *arg, struct altcp_pcb *conn, u16_t len);
+typedef err_t (*altcp_poll_fn)(void *arg, struct altcp_pcb *conn);
+typedef void  (*altcp_err_fn)(void *arg, err_t err);
+
+typedef struct altcp_pcb* (*altcp_new_fn)(void *arg, u8_t ip_type);
+
+struct altcp_pcb {
+  const struct altcp_functions *fns;
+  struct altcp_pcb *inner_conn;
+  void *arg;
+  void *state;
+  /* application callbacks */
+  altcp_accept_fn     accept;
+  altcp_connected_fn  connected;
+  altcp_recv_fn       recv;
+  altcp_sent_fn       sent;
+  altcp_poll_fn       poll;
+  altcp_err_fn        err;
+  u8_t pollinterval;
+};
+
+/** @ingroup altcp */
+typedef struct altcp_allocator_s {
+  /** Allocator function */
+  altcp_new_fn  alloc;
+  /** Argument to allocator function */
+  void         *arg;
+} altcp_allocator_t;
+
+struct altcp_pcb *altcp_new(altcp_allocator_t *allocator);
+struct altcp_pcb *altcp_new_ip6(altcp_allocator_t *allocator);
+struct altcp_pcb *altcp_new_ip_type(altcp_allocator_t *allocator, u8_t ip_type);
+
+void altcp_arg(struct altcp_pcb *conn, void *arg);
+void altcp_accept(struct altcp_pcb *conn, altcp_accept_fn accept);
+void altcp_recv(struct altcp_pcb *conn, altcp_recv_fn recv);
+void altcp_sent(struct altcp_pcb *conn, altcp_sent_fn sent);
+void altcp_poll(struct altcp_pcb *conn, altcp_poll_fn poll, u8_t interval);
+void altcp_err(struct altcp_pcb *conn, altcp_err_fn err);
+
+void  altcp_recved(struct altcp_pcb *conn, u16_t len);
+err_t altcp_bind(struct altcp_pcb *conn, const ip_addr_t *ipaddr, u16_t port);
+err_t altcp_connect(struct altcp_pcb *conn, const ip_addr_t *ipaddr, u16_t port, altcp_connected_fn connected);
+
+/* return conn for source code compatibility to tcp callback API only */
+struct altcp_pcb *altcp_listen_with_backlog_and_err(struct altcp_pcb *conn, u8_t backlog, err_t *err);
+#define altcp_listen_with_backlog(conn, backlog) altcp_listen_with_backlog_and_err(conn, backlog, NULL)
+/** @ingroup altcp */
+#define altcp_listen(conn) altcp_listen_with_backlog_and_err(conn, TCP_DEFAULT_LISTEN_BACKLOG, NULL)
+
+void altcp_abort(struct altcp_pcb *conn);
+err_t altcp_close(struct altcp_pcb *conn);
+err_t altcp_shutdown(struct altcp_pcb *conn, int shut_rx, int shut_tx);
+
+err_t altcp_write(struct altcp_pcb *conn, const void *dataptr, u16_t len, u8_t apiflags);
+err_t altcp_output(struct altcp_pcb *conn);
+
+u16_t altcp_mss(struct altcp_pcb *conn);
+u16_t altcp_sndbuf(struct altcp_pcb *conn);
+u16_t altcp_sndqueuelen(struct altcp_pcb *conn);
+void  altcp_nagle_disable(struct altcp_pcb *conn);
+void  altcp_nagle_enable(struct altcp_pcb *conn);
+int   altcp_nagle_disabled(struct altcp_pcb *conn);
+
+void  altcp_setprio(struct altcp_pcb *conn, u8_t prio);
+
+err_t altcp_get_tcp_addrinfo(struct altcp_pcb *conn, int local, ip_addr_t *addr, u16_t *port);
+ip_addr_t *altcp_get_ip(struct altcp_pcb *conn, int local);
+u16_t altcp_get_port(struct altcp_pcb *conn, int local);
+
+#ifdef LWIP_DEBUG
+enum tcp_state altcp_dbg_get_tcp_state(struct altcp_pcb *conn);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#else /* LWIP_ALTCP */
+
+/* ALTCP disabled, define everything to link against tcp callback API (e.g. to get a small non-ssl httpd) */
+
+#include "lwip/tcp.h"
+
+#define altcp_accept_fn tcp_accept_fn
+#define altcp_connected_fn tcp_connected_fn
+#define altcp_recv_fn tcp_recv_fn
+#define altcp_sent_fn tcp_sent_fn
+#define altcp_poll_fn tcp_poll_fn
+#define altcp_err_fn tcp_err_fn
+
+#define altcp_pcb tcp_pcb
+#define altcp_tcp_new_ip_type tcp_new_ip_type
+#define altcp_tcp_new tcp_new
+#define altcp_tcp_new_ip6 tcp_new_ip6
+
+#define altcp_new(allocator) tcp_new()
+#define altcp_new_ip6(allocator) tcp_new_ip6()
+#define altcp_new_ip_type(allocator, ip_type) tcp_new_ip_type(ip_type)
+
+#define altcp_arg tcp_arg
+#define altcp_accept tcp_accept
+#define altcp_recv tcp_recv
+#define altcp_sent tcp_sent
+#define altcp_poll tcp_poll
+#define altcp_err tcp_err
+
+#define altcp_recved tcp_recved
+#define altcp_bind tcp_bind
+#define altcp_connect tcp_connect
+
+#define altcp_listen_with_backlog_and_err tcp_listen_with_backlog_and_err
+#define altcp_listen_with_backlog tcp_listen_with_backlog
+#define altcp_listen tcp_listen
+
+#define altcp_abort tcp_abort
+#define altcp_close tcp_close
+#define altcp_shutdown tcp_shutdown
+
+#define altcp_write tcp_write
+#define altcp_output tcp_output
+
+#define altcp_mss tcp_mss
+#define altcp_sndbuf tcp_sndbuf
+#define altcp_sndqueuelen tcp_sndqueuelen
+#define altcp_nagle_disable tcp_nagle_disable
+#define altcp_nagle_enable tcp_nagle_enable
+#define altcp_nagle_disabled tcp_nagle_disabled
+#define altcp_setprio tcp_setprio
+
+#define altcp_get_tcp_addrinfo tcp_get_tcp_addrinfo
+#define altcp_get_ip(pcb, local) ((local) ? (&(pcb)->local_ip) : (&(pcb)->remote_ip))
+
+#ifdef LWIP_DEBUG
+#define altcp_dbg_get_tcp_state tcp_dbg_get_tcp_state
+#endif
+
+#endif /* LWIP_ALTCP */
+
+#endif /* LWIP_HDR_ALTCP_H */
@@ -0,0 +1,72 @@
+/**
+ * @file
+ * Application layered TCP connection API (to be used from TCPIP thread)\n
+ * This interface mimics the tcp callback API to the application while preventing
+ * direct linking (much like virtual functions).
+ * This way, an application can make use of other application layer protocols
+ * on top of TCP without knowing the details (e.g. TLS, proxy connection).
+ *
+ * This file contains the base implementation calling into tcp.
+ */
+
+/*
+ * Copyright (c) 2017 Simon Goldschmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt <goldsimon@gmx.de>
+ *
+ */
+#ifndef LWIP_HDR_ALTCP_TCP_H
+#define LWIP_HDR_ALTCP_TCP_H
+
+#include "lwip/opt.h"
+
+#if LWIP_ALTCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/altcp.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct altcp_pcb *altcp_tcp_new_ip_type(u8_t ip_type);
+
+#define altcp_tcp_new() altcp_tcp_new_ip_type(IPADDR_TYPE_V4)
+#define altcp_tcp_new_ip6() altcp_tcp_new_ip_type(IPADDR_TYPE_V6)
+
+struct altcp_pcb *altcp_tcp_alloc(void *arg, u8_t ip_type);
+
+struct tcp_pcb;
+struct altcp_pcb *altcp_tcp_wrap(struct tcp_pcb *tpcb);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_ALTCP */
+
+#endif /* LWIP_HDR_ALTCP_TCP_H */
@@ -0,0 +1,117 @@
+/**
+ * @file
+ * Application layered TCP/TLS connection API (to be used from TCPIP thread)
+ *
+ * @defgroup altcp_tls TLS layer
+ * @ingroup altcp
+ * This file contains function prototypes for a TLS layer.
+ * A port to ARM mbedtls is provided in the apps/ tree
+ * (LWIP_ALTCP_TLS_MBEDTLS option).
+ */
+
+/*
+ * Copyright (c) 2017 Simon Goldschmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt <goldsimon@gmx.de>
+ *
+ */
+#ifndef LWIP_HDR_ALTCP_TLS_H
+#define LWIP_HDR_ALTCP_TLS_H
+
+#include "lwip/opt.h"
+
+#if LWIP_ALTCP /* don't build if not configured for use in lwipopts.h */
+
+#if LWIP_ALTCP_TLS
+
+#include "lwip/altcp.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** @ingroup altcp_tls
+ * ALTCP_TLS configuration handle, content depends on port (e.g. mbedtls)
+ */
+struct altcp_tls_config;
+
+/** @ingroup altcp_tls
+ * Create an ALTCP_TLS server configuration handle
+ */
+struct altcp_tls_config *altcp_tls_create_config_server_privkey_cert(const u8_t *privkey, size_t privkey_len,
+                            const u8_t *privkey_pass, size_t privkey_pass_len,
+                            const u8_t *cert, size_t cert_len);
+
+/** @ingroup altcp_tls
+ * Create an ALTCP_TLS client configuration handle
+ */
+struct altcp_tls_config *altcp_tls_create_config_client(const u8_t *cert, size_t cert_len);
+
+/** @ingroup altcp_tls
+ * Create an ALTCP_TLS client configuration handle with two-way server/client authentication
+ */
+struct altcp_tls_config *altcp_tls_create_config_client_2wayauth(const u8_t *ca, size_t ca_len, const u8_t *privkey, size_t privkey_len,
+                            const u8_t *privkey_pass, size_t privkey_pass_len,
+                            const u8_t *cert, size_t cert_len);
+
+/** @ingroup altcp_tls
+ * Free an ALTCP_TLS configuration handle
+ */
+void altcp_tls_free_config(struct altcp_tls_config *conf);
+
+/** @ingroup altcp_tls
+ * Create new ALTCP_TLS layer wrapping an existing pcb as inner connection (e.g. TLS over TCP)
+ */
+struct altcp_pcb *altcp_tls_wrap(struct altcp_tls_config *config, struct altcp_pcb *inner_pcb);
+
+/** @ingroup altcp_tls
+ * Create new ALTCP_TLS pcb and its inner tcp pcb
+ */
+struct altcp_pcb *altcp_tls_new(struct altcp_tls_config *config, u8_t ip_type);
+
+/** @ingroup altcp_tls
+ * Create new ALTCP_TLS layer pcb and its inner tcp pcb.
+ * Same as @ref altcp_tls_new but this allocator function fits to
+ * @ref altcp_allocator_t / @ref altcp_new.\n
+ 'arg' must contain a struct altcp_tls_config *.
+ */
+struct altcp_pcb *altcp_tls_alloc(void *arg, u8_t ip_type);
+
+/** @ingroup altcp_tls
+ * Return pointer to internal TLS context so application can tweak it.
+ * Real type depends on port (e.g. mbedtls)
+ */
+void *altcp_tls_context(struct altcp_pcb *conn);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_ALTCP_TLS */
+#endif /* LWIP_ALTCP */
+#endif /* LWIP_HDR_ALTCP_TLS_H */
@@ -0,0 +1,431 @@
+/**
+ * @file
+ * netconn API (to be used from non-TCPIP threads)
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef LWIP_HDR_API_H
+#define LWIP_HDR_API_H
+
+#include "lwip/opt.h"
+
+#if LWIP_NETCONN || LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */
+/* Note: Netconn API is always available when sockets are enabled -
+ * sockets are implemented on top of them */
+
+#include "lwip/arch.h"
+#include "lwip/netbuf.h"
+#include "lwip/sys.h"
+#include "lwip/ip_addr.h"
+#include "lwip/err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Throughout this file, IP addresses and port numbers are expected to be in
+ * the same byte order as in the corresponding pcb.
+ */
+
+/* Flags for netconn_write (u8_t) */
+#define NETCONN_NOFLAG      0x00
+#define NETCONN_NOCOPY      0x00 /* Only for source code compatibility */
+#define NETCONN_COPY        0x01
+#define NETCONN_MORE        0x02
+#define NETCONN_DONTBLOCK   0x04
+#define NETCONN_NOAUTORCVD  0x08 /* prevent netconn_recv_data_tcp() from updating the tcp window - must be done manually via netconn_tcp_recvd() */
+#define NETCONN_NOFIN       0x10 /* upper layer already received data, leave FIN in queue until called again */
+
+/* Flags for struct netconn.flags (u8_t) */
+/** This netconn had an error, don't block on recvmbox/acceptmbox any more */
+#define NETCONN_FLAG_MBOXCLOSED               0x01
+/** Should this netconn avoid blocking? */
+#define NETCONN_FLAG_NON_BLOCKING             0x02
+/** Was the last connect action a non-blocking one? */
+#define NETCONN_FLAG_IN_NONBLOCKING_CONNECT   0x04
+#if LWIP_NETCONN_FULLDUPLEX
+  /** The mbox of this netconn is being deallocated, don't use it anymore */
+#define NETCONN_FLAG_MBOXINVALID              0x08
+#endif /* LWIP_NETCONN_FULLDUPLEX */
+/** If a nonblocking write has been rejected before, poll_tcp needs to
+    check if the netconn is writable again */
+#define NETCONN_FLAG_CHECK_WRITESPACE         0x10
+#if LWIP_IPV6
+/** If this flag is set then only IPv6 communication is allowed on the
+    netconn. As per RFC#3493 this features defaults to OFF allowing
+    dual-stack usage by default. */
+#define NETCONN_FLAG_IPV6_V6ONLY              0x20
+#endif /* LWIP_IPV6 */
+#if LWIP_NETBUF_RECVINFO
+/** Received packet info will be recorded for this netconn */
+#define NETCONN_FLAG_PKTINFO                  0x40
+#endif /* LWIP_NETBUF_RECVINFO */
+/** A FIN has been received but not passed to the application yet */
+#define NETCONN_FIN_RX_PENDING                0x80
+
+/* Helpers to process several netconn_types by the same code */
+#define NETCONNTYPE_GROUP(t)         ((t)&0xF0)
+#define NETCONNTYPE_DATAGRAM(t)      ((t)&0xE0)
+#if LWIP_IPV6
+#define NETCONN_TYPE_IPV6            0x08
+#define NETCONNTYPE_ISIPV6(t)        (((t)&NETCONN_TYPE_IPV6) != 0)
+#define NETCONNTYPE_ISUDPLITE(t)     (((t)&0xF3) == NETCONN_UDPLITE)
+#define NETCONNTYPE_ISUDPNOCHKSUM(t) (((t)&0xF3) == NETCONN_UDPNOCHKSUM)
+#else /* LWIP_IPV6 */
+#define NETCONNTYPE_ISIPV6(t)        (0)
+#define NETCONNTYPE_ISUDPLITE(t)     ((t) == NETCONN_UDPLITE)
+#define NETCONNTYPE_ISUDPNOCHKSUM(t) ((t) == NETCONN_UDPNOCHKSUM)
+#endif /* LWIP_IPV6 */
+
+/** @ingroup netconn_common
+ * Protocol family and type of the netconn
+ */
+enum netconn_type {
+  NETCONN_INVALID     = 0,
+  /** TCP IPv4 */
+  NETCONN_TCP         = 0x10,
+#if LWIP_IPV6
+  /** TCP IPv6 */
+  NETCONN_TCP_IPV6    = NETCONN_TCP | NETCONN_TYPE_IPV6 /* 0x18 */,
+#endif /* LWIP_IPV6 */
+  /** UDP IPv4 */
+  NETCONN_UDP         = 0x20,
+  /** UDP IPv4 lite */
+  NETCONN_UDPLITE     = 0x21,
+  /** UDP IPv4 no checksum */
+  NETCONN_UDPNOCHKSUM = 0x22,
+
+#if LWIP_IPV6
+  /** UDP IPv6 (dual-stack by default, unless you call @ref netconn_set_ipv6only) */
+  NETCONN_UDP_IPV6         = NETCONN_UDP | NETCONN_TYPE_IPV6 /* 0x28 */,
+  /** UDP IPv6 lite (dual-stack by default, unless you call @ref netconn_set_ipv6only) */
+  NETCONN_UDPLITE_IPV6     = NETCONN_UDPLITE | NETCONN_TYPE_IPV6 /* 0x29 */,
+  /** UDP IPv6 no checksum (dual-stack by default, unless you call @ref netconn_set_ipv6only) */
+  NETCONN_UDPNOCHKSUM_IPV6 = NETCONN_UDPNOCHKSUM | NETCONN_TYPE_IPV6 /* 0x2a */,
+#endif /* LWIP_IPV6 */
+
+  /** Raw connection IPv4 */
+  NETCONN_RAW         = 0x40
+#if LWIP_IPV6
+  /** Raw connection IPv6 (dual-stack by default, unless you call @ref netconn_set_ipv6only) */
+  , NETCONN_RAW_IPV6    = NETCONN_RAW | NETCONN_TYPE_IPV6 /* 0x48 */
+#endif /* LWIP_IPV6 */
+};
+
+/** Current state of the netconn. Non-TCP netconns are always
+ * in state NETCONN_NONE! */
+enum netconn_state {
+  NETCONN_NONE,
+  NETCONN_WRITE,
+  NETCONN_LISTEN,
+  NETCONN_CONNECT,
+  NETCONN_CLOSE
+};
+
+/** Used to inform the callback function about changes
+ * 
+ * Event explanation:
+ * 
+ * In the netconn implementation, there are three ways to block a client:
+ * 
+ * - accept mbox (sys_arch_mbox_fetch(&conn->acceptmbox, &accept_ptr, 0); in netconn_accept())
+ * - receive mbox (sys_arch_mbox_fetch(&conn->recvmbox, &buf, 0); in netconn_recv_data())
+ * - send queue is full (sys_arch_sem_wait(LWIP_API_MSG_SEM(msg), 0); in lwip_netconn_do_write())
+ * 
+ * The events have to be seen as events signaling the state of these mboxes/semaphores. For non-blocking
+ * connections, you need to know in advance whether a call to a netconn function call would block or not,
+ * and these events tell you about that.
+ * 
+ * RCVPLUS events say: Safe to perform a potentially blocking call call once more. 
+ * They are counted in sockets - three RCVPLUS events for accept mbox means you are safe
+ * to call netconn_accept 3 times without being blocked.
+ * Same thing for receive mbox.
+ * 
+ * RCVMINUS events say: Your call to to a possibly blocking function is "acknowledged".
+ * Socket implementation decrements the counter.
+ * 
+ * For TX, there is no need to count, its merely a flag. SENDPLUS means you may send something.
+ * SENDPLUS occurs when enough data was delivered to peer so netconn_send() can be called again.
+ * A SENDMINUS event occurs when the next call to a netconn_send() would be blocking.
+ */
+enum netconn_evt {
+  NETCONN_EVT_RCVPLUS,
+  NETCONN_EVT_RCVMINUS,
+  NETCONN_EVT_SENDPLUS,
+  NETCONN_EVT_SENDMINUS,
+  NETCONN_EVT_ERROR
+};
+
+#if LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD)
+/** Used for netconn_join_leave_group() */
+enum netconn_igmp {
+  NETCONN_JOIN,
+  NETCONN_LEAVE
+};
+#endif /* LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) */
+
+#if LWIP_DNS
+/* Used for netconn_gethostbyname_addrtype(), these should match the DNS_ADDRTYPE defines in dns.h */
+#define NETCONN_DNS_DEFAULT   NETCONN_DNS_IPV4_IPV6
+#define NETCONN_DNS_IPV4      0
+#define NETCONN_DNS_IPV6      1
+#define NETCONN_DNS_IPV4_IPV6 2 /* try to resolve IPv4 first, try IPv6 if IPv4 fails only */
+#define NETCONN_DNS_IPV6_IPV4 3 /* try to resolve IPv6 first, try IPv4 if IPv6 fails only */
+#endif /* LWIP_DNS */
+
+/* forward-declare some structs to avoid to include their headers */
+struct ip_pcb;
+struct tcp_pcb;
+struct udp_pcb;
+struct raw_pcb;
+struct netconn;
+struct api_msg;
+
+/** A callback prototype to inform about events for a netconn */
+typedef void (* netconn_callback)(struct netconn *, enum netconn_evt, u16_t len);
+
+/** A netconn descriptor */
+struct netconn {
+  /** type of the netconn (TCP, UDP or RAW) */
+  enum netconn_type type;
+  /** current state of the netconn */
+  enum netconn_state state;
+  /** the lwIP internal protocol control block */
+  union {
+    struct ip_pcb  *ip;
+    struct tcp_pcb *tcp;
+    struct udp_pcb *udp;
+    struct raw_pcb *raw;
+  } pcb;
+  /** the last asynchronous unreported error this netconn had */
+  err_t pending_err;
+#if !LWIP_NETCONN_SEM_PER_THREAD
+  /** sem that is used to synchronously execute functions in the core context */
+  sys_sem_t op_completed;
+#endif
+  /** mbox where received packets are stored until they are fetched
+      by the netconn application thread (can grow quite big) */
+  sys_mbox_t recvmbox;
+#if LWIP_TCP
+  /** mbox where new connections are stored until processed
+      by the application thread */
+  sys_mbox_t acceptmbox;
+#endif /* LWIP_TCP */
+#if LWIP_NETCONN_FULLDUPLEX
+  /** number of threads waiting on an mbox. This is required to unblock
+      all threads when closing while threads are waiting. */
+  int mbox_threads_waiting;
+#endif
+  /** only used for socket layer */
+#if LWIP_SOCKET
+  int socket;
+#endif /* LWIP_SOCKET */
+#if LWIP_SO_SNDTIMEO
+  /** timeout to wait for sending data (which means enqueueing data for sending
+      in internal buffers) in milliseconds */
+  s32_t send_timeout;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVTIMEO
+  /** timeout in milliseconds to wait for new data to be received
+      (or connections to arrive for listening netconns) */
+  u32_t recv_timeout;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+  /** maximum amount of bytes queued in recvmbox
+      not used for TCP: adjust TCP_WND instead! */
+  int recv_bufsize;
+  /** number of bytes currently in recvmbox to be received,
+      tested against recv_bufsize to limit bytes on recvmbox
+      for UDP and RAW, used for FIONREAD */
+  int recv_avail;
+#endif /* LWIP_SO_RCVBUF */
+#if LWIP_SO_LINGER
+   /** values <0 mean linger is disabled, values > 0 are seconds to linger */
+  s16_t linger;
+#endif /* LWIP_SO_LINGER */
+  /** flags holding more netconn-internal state, see NETCONN_FLAG_* defines */
+  u8_t flags;
+#if LWIP_TCP
+  /** TCP: when data passed to netconn_write doesn't fit into the send buffer,
+      this temporarily stores the message.
+      Also used during connect and close. */
+  struct api_msg *current_msg;
+#endif /* LWIP_TCP */
+  /** A callback function that is informed about events for this netconn */
+  netconn_callback callback;
+};
+
+/** This vector type is passed to @ref netconn_write_vectors_partly to send
+ * multiple buffers at once.
+ * ATTENTION: This type has to directly map struct iovec since one is casted
+ *            into the other!
+ */
+struct netvector {
+  /** pointer to the application buffer that contains the data to send */
+  const void *ptr;
+  /** size of the application data to send */
+  size_t len;
+};
+
+/** Register an Network connection event */
+#define API_EVENT(c,e,l) if (c->callback) {         \
+                           (*c->callback)(c, e, l); \
+                         }
+
+/* Network connection functions: */
+
+/** @ingroup netconn_common
+ * Create new netconn connection
+ * @param t @ref netconn_type */
+#define netconn_new(t)                  netconn_new_with_proto_and_callback(t, 0, NULL)
+#define netconn_new_with_callback(t, c) netconn_new_with_proto_and_callback(t, 0, c)
+struct netconn *netconn_new_with_proto_and_callback(enum netconn_type t, u8_t proto,
+                                             netconn_callback callback);
+err_t   netconn_prepare_delete(struct netconn *conn);
+err_t   netconn_delete(struct netconn *conn);
+/** Get the type of a netconn (as enum netconn_type). */
+#define netconn_type(conn) (conn->type)
+
+err_t   netconn_getaddr(struct netconn *conn, ip_addr_t *addr,
+                        u16_t *port, u8_t local);
+/** @ingroup netconn_common */
+#define netconn_peer(c,i,p) netconn_getaddr(c,i,p,0)
+/** @ingroup netconn_common */
+#define netconn_addr(c,i,p) netconn_getaddr(c,i,p,1)
+
+err_t   netconn_bind(struct netconn *conn, const ip_addr_t *addr, u16_t port);
+err_t   netconn_bind_if(struct netconn *conn, u8_t if_idx);
+err_t   netconn_connect(struct netconn *conn, const ip_addr_t *addr, u16_t port);
+err_t   netconn_disconnect (struct netconn *conn);
+err_t   netconn_listen_with_backlog(struct netconn *conn, u8_t backlog);
+/** @ingroup netconn_tcp */
+#define netconn_listen(conn) netconn_listen_with_backlog(conn, TCP_DEFAULT_LISTEN_BACKLOG)
+err_t   netconn_accept(struct netconn *conn, struct netconn **new_conn);
+err_t   netconn_recv(struct netconn *conn, struct netbuf **new_buf);
+err_t   netconn_recv_udp_raw_netbuf(struct netconn *conn, struct netbuf **new_buf);
+err_t   netconn_recv_udp_raw_netbuf_flags(struct netconn *conn, struct netbuf **new_buf, u8_t apiflags);
+err_t   netconn_recv_tcp_pbuf(struct netconn *conn, struct pbuf **new_buf);
+err_t   netconn_recv_tcp_pbuf_flags(struct netconn *conn, struct pbuf **new_buf, u8_t apiflags);
+err_t   netconn_tcp_recvd(struct netconn *conn, size_t len);
+err_t   netconn_sendto(struct netconn *conn, struct netbuf *buf,
+                             const ip_addr_t *addr, u16_t port);
+err_t   netconn_send(struct netconn *conn, struct netbuf *buf);
+err_t   netconn_write_partly(struct netconn *conn, const void *dataptr, size_t size,
+                             u8_t apiflags, size_t *bytes_written);
+err_t   netconn_write_vectors_partly(struct netconn *conn, struct netvector *vectors, u16_t vectorcnt,
+                                     u8_t apiflags, size_t *bytes_written);
+/** @ingroup netconn_tcp */
+#define netconn_write(conn, dataptr, size, apiflags) \
+          netconn_write_partly(conn, dataptr, size, apiflags, NULL)
+err_t   netconn_close(struct netconn *conn);
+err_t   netconn_shutdown(struct netconn *conn, u8_t shut_rx, u8_t shut_tx);
+
+#if LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD)
+err_t   netconn_join_leave_group(struct netconn *conn, const ip_addr_t *multiaddr,
+                             const ip_addr_t *netif_addr, enum netconn_igmp join_or_leave);
+err_t   netconn_join_leave_group_netif(struct netconn *conn, const ip_addr_t *multiaddr,
+                             u8_t if_idx, enum netconn_igmp join_or_leave);
+#endif /* LWIP_IGMP || (LWIP_IPV6 && LWIP_IPV6_MLD) */
+#if LWIP_DNS
+#if LWIP_IPV4 && LWIP_IPV6
+err_t   netconn_gethostbyname_addrtype(const char *name, ip_addr_t *addr, u8_t dns_addrtype);
+#define netconn_gethostbyname(name, addr) netconn_gethostbyname_addrtype(name, addr, NETCONN_DNS_DEFAULT)
+#else /* LWIP_IPV4 && LWIP_IPV6 */
+err_t   netconn_gethostbyname(const char *name, ip_addr_t *addr);
+#define netconn_gethostbyname_addrtype(name, addr, dns_addrtype) netconn_gethostbyname(name, addr)
+#endif /* LWIP_IPV4 && LWIP_IPV6 */
+#endif /* LWIP_DNS */
+
+err_t   netconn_err(struct netconn *conn);
+#define netconn_recv_bufsize(conn)      ((conn)->recv_bufsize)
+
+#define netconn_set_flags(conn, set_flags)     do { (conn)->flags = (u8_t)((conn)->flags |  (set_flags)); } while(0)
+#define netconn_clear_flags(conn, clr_flags)   do { (conn)->flags = (u8_t)((conn)->flags & (u8_t)(~(clr_flags) & 0xff)); } while(0)
+#define netconn_is_flag_set(conn, flag)        (((conn)->flags & (flag)) != 0)
+
+/** Set the blocking status of netconn calls (@todo: write/send is missing) */
+#define netconn_set_nonblocking(conn, val)  do { if(val) { \
+  netconn_set_flags(conn, NETCONN_FLAG_NON_BLOCKING); \
+} else { \
+  netconn_clear_flags(conn, NETCONN_FLAG_NON_BLOCKING); }} while(0)
+/** Get the blocking status of netconn calls (@todo: write/send is missing) */
+#define netconn_is_nonblocking(conn)        (((conn)->flags & NETCONN_FLAG_NON_BLOCKING) != 0)
+
+#if LWIP_IPV6
+/** @ingroup netconn_common
+ * TCP: Set the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY)
+ */
+#define netconn_set_ipv6only(conn, val)  do { if(val) { \
+  netconn_set_flags(conn, NETCONN_FLAG_IPV6_V6ONLY); \
+} else { \
+  netconn_clear_flags(conn, NETCONN_FLAG_IPV6_V6ONLY); }} while(0)
+/** @ingroup netconn_common
+ * TCP: Get the IPv6 ONLY status of netconn calls (see NETCONN_FLAG_IPV6_V6ONLY)
+ */
+#define netconn_get_ipv6only(conn)        (((conn)->flags & NETCONN_FLAG_IPV6_V6ONLY) != 0)
+#endif /* LWIP_IPV6 */
+
+#if LWIP_SO_SNDTIMEO
+/** Set the send timeout in milliseconds */
+#define netconn_set_sendtimeout(conn, timeout)      ((conn)->send_timeout = (timeout))
+/** Get the send timeout in milliseconds */
+#define netconn_get_sendtimeout(conn)               ((conn)->send_timeout)
+#endif /* LWIP_SO_SNDTIMEO */
+#if LWIP_SO_RCVTIMEO
+/** Set the receive timeout in milliseconds */
+#define netconn_set_recvtimeout(conn, timeout)      ((conn)->recv_timeout = (timeout))
+/** Get the receive timeout in milliseconds */
+#define netconn_get_recvtimeout(conn)               ((conn)->recv_timeout)
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+/** Set the receive buffer in bytes */
+#define netconn_set_recvbufsize(conn, recvbufsize)  ((conn)->recv_bufsize = (recvbufsize))
+/** Get the receive buffer in bytes */
+#define netconn_get_recvbufsize(conn)               ((conn)->recv_bufsize)
+#endif /* LWIP_SO_RCVBUF*/
+
+#if LWIP_NETCONN_SEM_PER_THREAD
+void netconn_thread_init(void);
+void netconn_thread_cleanup(void);
+#else /* LWIP_NETCONN_SEM_PER_THREAD */
+#define netconn_thread_init()
+#define netconn_thread_cleanup()
+#endif /* LWIP_NETCONN_SEM_PER_THREAD */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_NETCONN || LWIP_SOCKET */
+
+#endif /* LWIP_HDR_API_H */
@@ -0,0 +1,79 @@
+/**
+ * @file
+ * Application layered TCP connection API that executes a proxy-connect.
+ *
+ * This file provides a starting layer that executes a proxy-connect e.g. to
+ * set up TLS connections through a http proxy.
+ */
+
+/*
+ * Copyright (c) 2018 Simon Goldschmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt <goldsimon@gmx.de>
+ *
+ */
+
+#ifndef LWIP_HDR_APPS_ALTCP_PROXYCONNECT_H
+#define LWIP_HDR_APPS_ALTCP_PROXYCONNECT_H
+
+#include "lwip/opt.h"
+
+#if LWIP_ALTCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/ip_addr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct altcp_proxyconnect_config {
+  ip_addr_t proxy_addr;
+  u16_t proxy_port;
+};
+
+
+struct altcp_pcb *altcp_proxyconnect_new(struct altcp_proxyconnect_config *config, struct altcp_pcb *inner_pcb);
+struct altcp_pcb *altcp_proxyconnect_new_tcp(struct altcp_proxyconnect_config *config, u8_t ip_type);
+
+struct altcp_pcb *altcp_proxyconnect_alloc(void *arg, u8_t ip_type);
+
+#if LWIP_ALTCP_TLS
+struct altcp_proxyconnect_tls_config {
+  struct altcp_proxyconnect_config proxy;
+  struct altcp_tls_config *tls_config;
+};
+
+struct altcp_pcb *altcp_proxyconnect_tls_alloc(void *arg, u8_t ip_type);
+#endif /* LWIP_ALTCP_TLS */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_ALTCP */
+#endif /* LWIP_HDR_APPS_ALTCP_PROXYCONNECT_H */
@@ -0,0 +1,67 @@
+/**
+ * @file
+ * Application layered TCP/TLS connection API (to be used from TCPIP thread)
+ *
+ * This file contains options for an mbedtls port of the TLS layer.
+ */
+
+/*
+ * Copyright (c) 2017 Simon Goldschmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt <goldsimon@gmx.de>
+ *
+ */
+#ifndef LWIP_HDR_ALTCP_TLS_OPTS_H
+#define LWIP_HDR_ALTCP_TLS_OPTS_H
+
+#include "lwip/opt.h"
+
+#if LWIP_ALTCP /* don't build if not configured for use in lwipopts.h */
+
+/** LWIP_ALTCP_TLS_MBEDTLS==1: use mbedTLS for TLS support for altcp API
+ * mbedtls include directory must be reachable via include search path
+ */
+#ifndef LWIP_ALTCP_TLS_MBEDTLS
+#define LWIP_ALTCP_TLS_MBEDTLS                        0
+#endif
+
+/** Configure debug level of this file */
+#ifndef ALTCP_MBEDTLS_DEBUG
+#define ALTCP_MBEDTLS_DEBUG                           LWIP_DBG_OFF
+#endif
+
+/** Set a session timeout in seconds for the basic session cache
+ * ATTENTION: Using a session cache can lower security by reusing keys!
+ */
+#ifndef ALTCP_MBEDTLS_SESSION_CACHE_TIMEOUT_SECONDS
+#define ALTCP_MBEDTLS_SESSION_CACHE_TIMEOUT_SECONDS   0
+#endif
+
+#endif /* LWIP_ALTCP */
+
+#endif /* LWIP_HDR_ALTCP_TLS_OPTS_H */
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * All rights reserved. 
+ * 
+ * Redistribution and use in source and binary forms, with or without modification, 
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ * 
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef LWIP_HDR_APPS_FS_H
+#define LWIP_HDR_APPS_FS_H
+
+#include "httpd_opts.h"
+#include "lwip/err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define FS_READ_EOF     -1
+#define FS_READ_DELAYED -2
+
+#if HTTPD_PRECALCULATED_CHECKSUM
+struct fsdata_chksum {
+  u32_t offset;
+  u16_t chksum;
+  u16_t len;
+};
+#endif /* HTTPD_PRECALCULATED_CHECKSUM */
+
+#define FS_FILE_FLAGS_HEADER_INCLUDED     0x01
+#define FS_FILE_FLAGS_HEADER_PERSISTENT   0x02
+#define FS_FILE_FLAGS_HEADER_HTTPVER_1_1  0x04
+#define FS_FILE_FLAGS_SSI                 0x08
+
+/** Define FS_FILE_EXTENSION_T_DEFINED if you have typedef'ed to your private
+ * pointer type (defaults to 'void' so the default usage is 'void*')
+ */
+#ifndef FS_FILE_EXTENSION_T_DEFINED
+typedef void fs_file_extension;
+#endif
+
+struct fs_file {
+  const char *data;
+  int len;
+  int index;
+  /* pextension is free for implementations to hold private (extensional)
+     arbitrary data, e.g. holding some file state or file system handle */
+  fs_file_extension *pextension;
+#if HTTPD_PRECALCULATED_CHECKSUM
+  const struct fsdata_chksum *chksum;
+  u16_t chksum_count;
+#endif /* HTTPD_PRECALCULATED_CHECKSUM */
+  u8_t flags;
+#if LWIP_HTTPD_CUSTOM_FILES
+  u8_t is_custom_file;
+#endif /* LWIP_HTTPD_CUSTOM_FILES */
+#if LWIP_HTTPD_FILE_STATE
+  void *state;
+#endif /* LWIP_HTTPD_FILE_STATE */
+};
+
+#if LWIP_HTTPD_FS_ASYNC_READ
+typedef void (*fs_wait_cb)(void *arg);
+#endif /* LWIP_HTTPD_FS_ASYNC_READ */
+
+err_t fs_open(struct fs_file *file, const char *name);
+void fs_close(struct fs_file *file);
+#if LWIP_HTTPD_DYNAMIC_FILE_READ
+#if LWIP_HTTPD_FS_ASYNC_READ
+int fs_read_async(struct fs_file *file, char *buffer, int count, fs_wait_cb callback_fn, void *callback_arg);
+#else /* LWIP_HTTPD_FS_ASYNC_READ */
+int fs_read(struct fs_file *file, char *buffer, int count);
+#endif /* LWIP_HTTPD_FS_ASYNC_READ */
+#endif /* LWIP_HTTPD_DYNAMIC_FILE_READ */
+#if LWIP_HTTPD_FS_ASYNC_READ
+int fs_is_file_ready(struct fs_file *file, fs_wait_cb callback_fn, void *callback_arg);
+#endif /* LWIP_HTTPD_FS_ASYNC_READ */
+int fs_bytes_left(struct fs_file *file);
+
+#if LWIP_HTTPD_FILE_STATE
+/** This user-defined function is called when a file is opened. */
+void *fs_state_init(struct fs_file *file, const char *name);
+/** This user-defined function is called when a file is closed. */
+void fs_state_free(struct fs_file *file, void *state);
+#endif /* #if LWIP_HTTPD_FILE_STATE */
+
+struct fsdata_file {
+  const struct fsdata_file *next;
+  const unsigned char *name;
+  const unsigned char *data;
+  int len;
+  u8_t flags;
+#if HTTPD_PRECALCULATED_CHECKSUM
+  u16_t chksum_count;
+  const struct fsdata_chksum *chksum;
+#endif /* HTTPD_PRECALCULATED_CHECKSUM */
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_FS_H */
@@ -0,0 +1,160 @@
+/**
+ * @file
+ * HTTP client
+ */
+
+/*
+ * Copyright (c) 2018 Simon Goldschmidt <goldsimon@gmx.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt <goldsimon@gmx.de>
+ *
+ */
+
+#ifndef LWIP_HDR_APPS_HTTP_CLIENT_H
+#define LWIP_HDR_APPS_HTTP_CLIENT_H
+
+#include "lwip/opt.h"
+#include "lwip/ip_addr.h"
+#include "lwip/err.h"
+#include "lwip/altcp.h"
+#include "lwip/prot/iana.h"
+#include "lwip/pbuf.h"
+
+#if LWIP_TCP && LWIP_CALLBACK_API
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @ingroup httpc 
+ * HTTPC_HAVE_FILE_IO: define this to 1 to have functions dowloading directly
+ * to disk via fopen/fwrite.
+ * These functions are example implementations of the interface only.
+ */
+#ifndef LWIP_HTTPC_HAVE_FILE_IO
+#define LWIP_HTTPC_HAVE_FILE_IO   0
+#endif
+
+/**
+ * @ingroup httpc 
+ * The default TCP port used for HTTP
+ */
+#define HTTP_DEFAULT_PORT         LWIP_IANA_PORT_HTTP
+
+/**
+ * @ingroup httpc 
+ * HTTP client result codes
+ */
+typedef enum ehttpc_result {
+  /** File successfully received */
+  HTTPC_RESULT_OK            = 0,
+  /** Unknown error */
+  HTTPC_RESULT_ERR_UNKNOWN   = 1,
+  /** Connection to server failed */
+  HTTPC_RESULT_ERR_CONNECT   = 2,
+  /** Failed to resolve server hostname */
+  HTTPC_RESULT_ERR_HOSTNAME  = 3,
+  /** Connection unexpectedly closed by remote server */
+  HTTPC_RESULT_ERR_CLOSED    = 4,
+  /** Connection timed out (server didn't respond in time) */
+  HTTPC_RESULT_ERR_TIMEOUT   = 5,
+  /** Server responded with an error code */
+  HTTPC_RESULT_ERR_SVR_RESP  = 6,
+  /** Local memory error */
+  HTTPC_RESULT_ERR_MEM       = 7,
+  /** Local abort */
+  HTTPC_RESULT_LOCAL_ABORT   = 8,
+  /** Content length mismatch */
+  HTTPC_RESULT_ERR_CONTENT_LEN = 9
+} httpc_result_t;
+
+typedef struct _httpc_state httpc_state_t;
+
+/**
+ * @ingroup httpc 
+ * Prototype of a http client callback function
+ *
+ * @param arg argument specified when initiating the request
+ * @param httpc_result result of the http transfer (see enum httpc_result_t)
+ * @param rx_content_len number of bytes received (without headers)
+ * @param srv_res this contains the http status code received (if any)
+ * @param err an error returned by internal lwip functions, can help to specify
+ *            the source of the error but must not necessarily be != ERR_OK
+ */
+typedef void (*httpc_result_fn)(void *arg, httpc_result_t httpc_result, u32_t rx_content_len, u32_t srv_res, err_t err);
+
+/**
+ * @ingroup httpc 
+ * Prototype of http client callback: called when the headers are received
+ *
+ * @param connection http client connection
+ * @param arg argument specified when initiating the request
+ * @param hdr header pbuf(s) (may contain data also)
+ * @param hdr_len length of the heders in 'hdr'
+ * @param content_len content length as received in the headers (-1 if not received)
+ * @return if != ERR_OK is returned, the connection is aborted
+ */
+typedef err_t (*httpc_headers_done_fn)(httpc_state_t *connection, void *arg, struct pbuf *hdr, u16_t hdr_len, u32_t content_len);
+
+typedef struct _httpc_connection {
+  ip_addr_t proxy_addr;
+  u16_t proxy_port;
+  u8_t use_proxy;
+  /* @todo: add username:pass? */
+
+#if LWIP_ALTCP
+  altcp_allocator_t *altcp_allocator;
+#endif
+
+  /* this callback is called when the transfer is finished (or aborted) */
+  httpc_result_fn result_fn;
+  /* this callback is called after receiving the http headers
+     It can abort the connection by returning != ERR_OK */
+  httpc_headers_done_fn headers_done_fn;
+} httpc_connection_t;
+
+err_t httpc_get_file(const ip_addr_t* server_addr, u16_t port, const char* uri, const httpc_connection_t *settings,
+                     altcp_recv_fn recv_fn, void* callback_arg, httpc_state_t **connection);
+err_t httpc_get_file_dns(const char* server_name, u16_t port, const char* uri, const httpc_connection_t *settings,
+                     altcp_recv_fn recv_fn, void* callback_arg, httpc_state_t **connection);
+
+#if LWIP_HTTPC_HAVE_FILE_IO
+err_t httpc_get_file_to_disk(const ip_addr_t* server_addr, u16_t port, const char* uri, const httpc_connection_t *settings,
+                     void* callback_arg, const char* local_file_name, httpc_state_t **connection);
+err_t httpc_get_file_dns_to_disk(const char* server_name, u16_t port, const char* uri, const httpc_connection_t *settings,
+                     void* callback_arg, const char* local_file_name, httpc_state_t **connection);
+#endif /* LWIP_HTTPC_HAVE_FILE_IO */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_TCP && LWIP_CALLBACK_API */
+
+#endif /* LWIP_HDR_APPS_HTTP_CLIENT_H */
@@ -0,0 +1,255 @@
+/**
+ * @file
+ * HTTP server
+ */
+
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * This version of the file has been modified by Texas Instruments to offer
+ * simple server-side-include (SSI) and Common Gateway Interface (CGI)
+ * capability.
+ */
+
+#ifndef LWIP_HDR_APPS_HTTPD_H
+#define LWIP_HDR_APPS_HTTPD_H
+
+#include "httpd_opts.h"
+#include "lwip/err.h"
+#include "lwip/pbuf.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_HTTPD_CGI
+
+/**
+ * @ingroup httpd
+ * Function pointer for a CGI script handler.
+ *
+ * This function is called each time the HTTPD server is asked for a file
+ * whose name was previously registered as a CGI function using a call to
+ * http_set_cgi_handlers. The iIndex parameter provides the index of the
+ * CGI within the cgis array passed to http_set_cgi_handlers. Parameters
+ * pcParam and pcValue provide access to the parameters provided along with
+ * the URI. iNumParams provides a count of the entries in the pcParam and
+ * pcValue arrays. Each entry in the pcParam array contains the name of a
+ * parameter with the corresponding entry in the pcValue array containing the
+ * value for that parameter. Note that pcParam may contain multiple elements
+ * with the same name if, for example, a multi-selection list control is used
+ * in the form generating the data.
+ *
+ * The function should return a pointer to a character string which is the
+ * path and filename of the response that is to be sent to the connected
+ * browser, for example "/thanks.htm" or "/response/error.ssi".
+ *
+ * The maximum number of parameters that will be passed to this function via
+ * iNumParams is defined by LWIP_HTTPD_MAX_CGI_PARAMETERS. Any parameters in
+ * the incoming HTTP request above this number will be discarded.
+ *
+ * Requests intended for use by this CGI mechanism must be sent using the GET
+ * method (which encodes all parameters within the URI rather than in a block
+ * later in the request). Attempts to use the POST method will result in the
+ * request being ignored.
+ *
+ */
+typedef const char *(*tCGIHandler)(int iIndex, int iNumParams, char *pcParam[],
+                             char *pcValue[]);
+
+/**
+ * @ingroup httpd
+ * Structure defining the base filename (URL) of a CGI and the associated
+ * function which is to be called when that URL is requested.
+ */
+typedef struct
+{
+    const char *pcCGIName;
+    tCGIHandler pfnCGIHandler;
+} tCGI;
+
+void http_set_cgi_handlers(const tCGI *pCGIs, int iNumHandlers);
+
+#endif /* LWIP_HTTPD_CGI */
+
+#if LWIP_HTTPD_CGI || LWIP_HTTPD_CGI_SSI
+
+#if LWIP_HTTPD_CGI_SSI
+/* we have to prototype this struct here to make it available for the handler */
+struct fs_file;
+
+/** Define this generic CGI handler in your application.
+ * It is called once for every URI with parameters.
+ * The parameters can be stored to the object passed as connection_state, which
+ * is allocated to file->state via fs_state_init() from fs_open() or fs_open_custom().
+ * Content creation via SSI or complete dynamic files can retrieve the CGI params from there.
+ */
+extern void httpd_cgi_handler(struct fs_file *file, const char* uri, int iNumParams,
+                              char **pcParam, char **pcValue
+#if defined(LWIP_HTTPD_FILE_STATE) && LWIP_HTTPD_FILE_STATE
+                                     , void *connection_state
+#endif /* LWIP_HTTPD_FILE_STATE */
+                                     );
+#endif /* LWIP_HTTPD_CGI_SSI */
+
+#endif /* LWIP_HTTPD_CGI || LWIP_HTTPD_CGI_SSI */
+
+#if LWIP_HTTPD_SSI
+
+/**
+ * @ingroup httpd
+ * Function pointer for the SSI tag handler callback.
+ *
+ * This function will be called each time the HTTPD server detects a tag of the
+ * form <!--#name--> in files with extensions mentioned in the g_pcSSIExtensions
+ * array (currently .shtml, .shtm, .ssi, .xml, .json) where "name" appears as
+ * one of the tags supplied to http_set_ssi_handler in the tags array.  The
+ * returned insert string, which will be appended after the the string
+ * "<!--#name-->" in file sent back to the client, should be written to pointer
+ * pcInsert. iInsertLen contains the size of the buffer pointed to by
+ * pcInsert. The iIndex parameter provides the zero-based index of the tag as
+ * found in the tags array and identifies the tag that is to be processed.
+ *
+ * The handler returns the number of characters written to pcInsert excluding
+ * any terminating NULL or HTTPD_SSI_TAG_UNKNOWN when tag is not recognized.
+ *
+ * Note that the behavior of this SSI mechanism is somewhat different from the
+ * "normal" SSI processing as found in, for example, the Apache web server.  In
+ * this case, the inserted text is appended following the SSI tag rather than
+ * replacing the tag entirely.  This allows for an implementation that does not
+ * require significant additional buffering of output data yet which will still
+ * offer usable SSI functionality. One downside to this approach is when
+ * attempting to use SSI within JavaScript.  The SSI tag is structured to
+ * resemble an HTML comment but this syntax does not constitute a comment
+ * within JavaScript and, hence, leaving the tag in place will result in
+ * problems in these cases. In order to avoid these problems, define
+ * LWIP_HTTPD_SSI_INCLUDE_TAG as zero in your lwip options file, or use JavaScript
+ * style block comments in the form / * # name * / (without the spaces).
+ */
+typedef u16_t (*tSSIHandler)(
+#if LWIP_HTTPD_SSI_RAW
+                             const char* ssi_tag_name,
+#else /* LWIP_HTTPD_SSI_RAW */
+                             int iIndex,
+#endif /* LWIP_HTTPD_SSI_RAW */
+                             char *pcInsert, int iInsertLen
+#if LWIP_HTTPD_SSI_MULTIPART
+                             , u16_t current_tag_part, u16_t *next_tag_part
+#endif /* LWIP_HTTPD_SSI_MULTIPART */
+#if defined(LWIP_HTTPD_FILE_STATE) && LWIP_HTTPD_FILE_STATE
+                             , void *connection_state
+#endif /* LWIP_HTTPD_FILE_STATE */
+                             );
+
+/** Set the SSI handler function
+ * (if LWIP_HTTPD_SSI_RAW==1, only the first argument is used)
+ */
+void http_set_ssi_handler(tSSIHandler pfnSSIHandler,
+                          const char **ppcTags, int iNumTags);
+
+/** For LWIP_HTTPD_SSI_RAW==1, return this to indicate the tag is unknown.
+ * In this case, the webserver writes a warning into the page.
+ * You can also just return 0 to write nothing for unknown tags.
+ */
+#define HTTPD_SSI_TAG_UNKNOWN 0xFFFF
+
+#endif /* LWIP_HTTPD_SSI */
+
+#if LWIP_HTTPD_SUPPORT_POST
+
+/* These functions must be implemented by the application */
+
+/**
+ * @ingroup httpd
+ * Called when a POST request has been received. The application can decide
+ * whether to accept it or not.
+ *
+ * @param connection Unique connection identifier, valid until httpd_post_end
+ *        is called.
+ * @param uri The HTTP header URI receiving the POST request.
+ * @param http_request The raw HTTP request (the first packet, normally).
+ * @param http_request_len Size of 'http_request'.
+ * @param content_len Content-Length from HTTP header.
+ * @param response_uri Filename of response file, to be filled when denying the
+ *        request
+ * @param response_uri_len Size of the 'response_uri' buffer.
+ * @param post_auto_wnd Set this to 0 to let the callback code handle window
+ *        updates by calling 'httpd_post_data_recved' (to throttle rx speed)
+ *        default is 1 (httpd handles window updates automatically)
+ * @return ERR_OK: Accept the POST request, data may be passed in
+ *         another err_t: Deny the POST request, send back 'bad request'.
+ */
+err_t httpd_post_begin(void *connection, const char *uri, const char *http_request,
+                       u16_t http_request_len, int content_len, char *response_uri,
+                       u16_t response_uri_len, u8_t *post_auto_wnd);
+
+/**
+ * @ingroup httpd
+ * Called for each pbuf of data that has been received for a POST.
+ * ATTENTION: The application is responsible for freeing the pbufs passed in!
+ *
+ * @param connection Unique connection identifier.
+ * @param p Received data.
+ * @return ERR_OK: Data accepted.
+ *         another err_t: Data denied, http_post_get_response_uri will be called.
+ */
+err_t httpd_post_receive_data(void *connection, struct pbuf *p);
+
+/**
+ * @ingroup httpd
+ * Called when all data is received or when the connection is closed.
+ * The application must return the filename/URI of a file to send in response
+ * to this POST request. If the response_uri buffer is untouched, a 404
+ * response is returned.
+ *
+ * @param connection Unique connection identifier.
+ * @param response_uri Filename of response file, to be filled when denying the request
+ * @param response_uri_len Size of the 'response_uri' buffer.
+ */
+void httpd_post_finished(void *connection, char *response_uri, u16_t response_uri_len);
+
+#if LWIP_HTTPD_POST_MANUAL_WND
+void httpd_post_data_recved(void *connection, u16_t recved_len);
+#endif /* LWIP_HTTPD_POST_MANUAL_WND */
+
+#endif /* LWIP_HTTPD_SUPPORT_POST */
+
+void httpd_init(void);
+
+#if HTTPD_ENABLE_HTTPS
+struct altcp_tls_config;
+void httpd_inits(struct altcp_tls_config *conf);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_HTTPD_H */
@@ -0,0 +1,396 @@
+/**
+ * @file
+ * HTTP server options list
+ */
+
+/*
+ * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * This version of the file has been modified by Texas Instruments to offer
+ * simple server-side-include (SSI) and Common Gateway Interface (CGI)
+ * capability.
+ */
+
+#ifndef LWIP_HDR_APPS_HTTPD_OPTS_H
+#define LWIP_HDR_APPS_HTTPD_OPTS_H
+
+#include "lwip/opt.h"
+#include "lwip/prot/iana.h"
+
+/**
+ * @defgroup httpd_opts Options
+ * @ingroup httpd
+ * @{
+ */
+
+/** Set this to 1 to support CGI (old style).
+ *
+ * This old style CGI support works by registering an array of URLs and
+ * associated CGI handler functions (@ref http_set_cgi_handlers).
+ * This list is scanned just before fs_open is called from request handling.
+ * The handler can return a new URL that is used internally by the httpd to
+ * load the returned page (passed to fs_open).
+ *
+ * Use this CGI type e.g. to execute specific actions and return a page that
+ * does not depend on the CGI parameters.
+ */
+#if !defined LWIP_HTTPD_CGI || defined __DOXYGEN__
+#define LWIP_HTTPD_CGI            0
+#endif
+
+/** Set this to 1 to support CGI (new style).
+ *
+ * This new style CGI support works by calling a global function
+ * (@ref tCGIHandler) for all URLs that are found. fs_open is called first
+ * and the URL can not be written by the CGI handler. Instead, this handler gets
+ * passed the http file state, an object where it can store information derived
+ * from the CGI URL or parameters. This file state is later passed to SSI, so
+ * the SSI code can return data depending on CGI input.
+ *
+ * Use this CGI handler if you want CGI information passed on to SSI.
+ */
+#if !defined LWIP_HTTPD_CGI_SSI || defined __DOXYGEN__
+#define LWIP_HTTPD_CGI_SSI        0
+#endif
+
+/** Set this to 1 to support SSI (Server-Side-Includes)
+ *
+ * In contrast to other http servers, this only calls a preregistered callback
+ * function (@see http_set_ssi_handler) for each tag (in the format of
+ * <!--#tag-->) encountered in SSI-enabled pages.
+ * SSI-enabled pages must have one of the predefined SSI-enabled file extensions.
+ * All files with one of these extensions are parsed when sent.
+ *
+ * A downside of the current SSI implementation is that persistent connections
+ * don't work, as the file length is not known in advance (and httpd currently
+ * relies on the Content-Length header for persistent connections).
+ *
+ * To save memory, the maximum tag length is limited (@see LWIP_HTTPD_MAX_TAG_NAME_LEN).
+ * To save memory, the maximum insertion string length is limited (@see
+ * LWIP_HTTPD_MAX_TAG_INSERT_LEN). If this is not enought, @ref LWIP_HTTPD_SSI_MULTIPART
+ * can be used.
+ */
+#if !defined LWIP_HTTPD_SSI || defined __DOXYGEN__
+#define LWIP_HTTPD_SSI            0
+#endif
+
+/** Set this to 1 to implement an SSI tag handler callback that gets a const char*
+ * to the tag (instead of an index into a pre-registered array of known tags)
+ * If this is 0, the SSI handler callback function is only called pre-registered tags.
+ */
+#if !defined LWIP_HTTPD_SSI_RAW || defined __DOXYGEN__
+#define LWIP_HTTPD_SSI_RAW        0
+#endif
+
+/** Set this to 0 to prevent parsing the file extension at runtime to decide
+ * if a file should be scanned for SSI tags or not.
+ * Default is 1 (file extensions are checked using the g_pcSSIExtensions array)
+ * Set to 2 to override this runtime test function.
+ *
+ * This is enabled by default, but if you only use a newer version of makefsdata
+ * supporting the "-ssi" option, this info is already present in
+ */
+#if !defined LWIP_HTTPD_SSI_BY_FILE_EXTENSION || defined __DOXYGEN__
+#define LWIP_HTTPD_SSI_BY_FILE_EXTENSION  1
+#endif
+
+/** Set this to 1 to support HTTP POST */
+#if !defined LWIP_HTTPD_SUPPORT_POST || defined __DOXYGEN__
+#define LWIP_HTTPD_SUPPORT_POST   0
+#endif
+
+/* The maximum number of parameters that the CGI handler can be sent. */
+#if !defined LWIP_HTTPD_MAX_CGI_PARAMETERS || defined __DOXYGEN__
+#define LWIP_HTTPD_MAX_CGI_PARAMETERS 16
+#endif
+
+/** LWIP_HTTPD_SSI_MULTIPART==1: SSI handler function is called with 2 more
+ * arguments indicating a counter for insert string that are too long to be
+ * inserted at once: the SSI handler function must then set 'next_tag_part'
+ * which will be passed back to it in the next call. */
+#if !defined LWIP_HTTPD_SSI_MULTIPART || defined __DOXYGEN__
+#define LWIP_HTTPD_SSI_MULTIPART    0
+#endif
+
+/* The maximum length of the string comprising the SSI tag name
+ * ATTENTION: tags longer than this are ignored, not truncated!
+ */
+#if !defined LWIP_HTTPD_MAX_TAG_NAME_LEN || defined __DOXYGEN__
+#define LWIP_HTTPD_MAX_TAG_NAME_LEN 8
+#endif
+
+/* The maximum length of string that can be returned to replace any given tag
+ * If this buffer is not long enough, use LWIP_HTTPD_SSI_MULTIPART.
+ */
+#if !defined LWIP_HTTPD_MAX_TAG_INSERT_LEN || defined __DOXYGEN__
+#define LWIP_HTTPD_MAX_TAG_INSERT_LEN 192
+#endif
+
+#if !defined LWIP_HTTPD_POST_MANUAL_WND || defined __DOXYGEN__
+#define LWIP_HTTPD_POST_MANUAL_WND  0
+#endif
+
+/** This string is passed in the HTTP header as "Server: " */
+#if !defined HTTPD_SERVER_AGENT || defined __DOXYGEN__
+#define HTTPD_SERVER_AGENT "lwIP/" LWIP_VERSION_STRING " (http://savannah.nongnu.org/projects/lwip)"
+#endif
+
+/** Set this to 1 if you want to include code that creates HTTP headers
+ * at runtime. Default is off: HTTP headers are then created statically
+ * by the makefsdata tool. Static headers mean smaller code size, but
+ * the (readonly) fsdata will grow a bit as every file includes the HTTP
+ * header. */
+#if !defined LWIP_HTTPD_DYNAMIC_HEADERS || defined __DOXYGEN__
+#define LWIP_HTTPD_DYNAMIC_HEADERS 0
+#endif
+
+#if !defined HTTPD_DEBUG || defined __DOXYGEN__
+#define HTTPD_DEBUG         LWIP_DBG_OFF
+#endif
+
+/** Set this to 1 to use a memp pool for allocating 
+ * struct http_state instead of the heap.
+ * If enabled, you'll need to define MEMP_NUM_PARALLEL_HTTPD_CONNS
+ * (and MEMP_NUM_PARALLEL_HTTPD_SSI_CONNS for SSI) to set the size of
+ * the pool(s).
+ */
+#if !defined HTTPD_USE_MEM_POOL || defined __DOXYGEN__
+#define HTTPD_USE_MEM_POOL  0
+#endif
+
+/** The server port for HTTPD to use */
+#if !defined HTTPD_SERVER_PORT || defined __DOXYGEN__
+#define HTTPD_SERVER_PORT                   LWIP_IANA_PORT_HTTP
+#endif
+
+/** The https server port for HTTPD to use */
+#if !defined HTTPD_SERVER_PORT_HTTPS || defined __DOXYGEN__
+#define HTTPD_SERVER_PORT_HTTPS             LWIP_IANA_PORT_HTTPS
+#endif
+
+/** Enable https support? */
+#if !defined HTTPD_ENABLE_HTTPS || defined __DOXYGEN__
+#define HTTPD_ENABLE_HTTPS                  0
+#endif
+
+/** Maximum retries before the connection is aborted/closed.
+ * - number of times pcb->poll is called -> default is 4*500ms = 2s;
+ * - reset when pcb->sent is called
+ */
+#if !defined HTTPD_MAX_RETRIES || defined __DOXYGEN__
+#define HTTPD_MAX_RETRIES                   4
+#endif
+
+/** The poll delay is X*500ms */
+#if !defined HTTPD_POLL_INTERVAL || defined __DOXYGEN__
+#define HTTPD_POLL_INTERVAL                 4
+#endif
+
+/** Priority for tcp pcbs created by HTTPD (very low by default).
+ *  Lower priorities get killed first when running out of memory.
+ */
+#if !defined HTTPD_TCP_PRIO || defined __DOXYGEN__
+#define HTTPD_TCP_PRIO                      TCP_PRIO_MIN
+#endif
+
+/** Set this to 1 to enable timing each file sent */
+#if !defined LWIP_HTTPD_TIMING || defined __DOXYGEN__
+#define LWIP_HTTPD_TIMING                   0
+#endif
+/** Set this to 1 to enable timing each file sent */
+#if !defined HTTPD_DEBUG_TIMING || defined __DOXYGEN__
+#define HTTPD_DEBUG_TIMING                  LWIP_DBG_OFF
+#endif
+
+/** Set this to one to show error pages when parsing a request fails instead
+    of simply closing the connection. */
+#if !defined LWIP_HTTPD_SUPPORT_EXTSTATUS || defined __DOXYGEN__
+#define LWIP_HTTPD_SUPPORT_EXTSTATUS        0
+#endif
+
+/** Set this to 0 to drop support for HTTP/0.9 clients (to save some bytes) */
+#if !defined LWIP_HTTPD_SUPPORT_V09 || defined __DOXYGEN__
+#define LWIP_HTTPD_SUPPORT_V09              1
+#endif
+
+/** Set this to 1 to enable HTTP/1.1 persistent connections.
+ * ATTENTION: If the generated file system includes HTTP headers, these must
+ * include the "Connection: keep-alive" header (pass argument "-11" to makefsdata).
+ */
+#if !defined LWIP_HTTPD_SUPPORT_11_KEEPALIVE || defined __DOXYGEN__
+#define LWIP_HTTPD_SUPPORT_11_KEEPALIVE     0
+#endif
+
+/** Set this to 1 to support HTTP request coming in in multiple packets/pbufs */
+#if !defined LWIP_HTTPD_SUPPORT_REQUESTLIST || defined __DOXYGEN__
+#define LWIP_HTTPD_SUPPORT_REQUESTLIST      1
+#endif
+
+#if LWIP_HTTPD_SUPPORT_REQUESTLIST
+/** Number of rx pbufs to enqueue to parse an incoming request (up to the first
+    newline) */
+#if !defined LWIP_HTTPD_REQ_QUEUELEN || defined __DOXYGEN__
+#define LWIP_HTTPD_REQ_QUEUELEN             5
+#endif
+
+/** Number of (TCP payload-) bytes (in pbufs) to enqueue to parse and incoming
+    request (up to the first double-newline) */
+#if !defined LWIP_HTTPD_REQ_BUFSIZE || defined __DOXYGEN__
+#define LWIP_HTTPD_REQ_BUFSIZE              LWIP_HTTPD_MAX_REQ_LENGTH
+#endif
+
+/** Defines the maximum length of a HTTP request line (up to the first CRLF,
+    copied from pbuf into this a global buffer when pbuf- or packet-queues
+    are received - otherwise the input pbuf is used directly) */
+#if !defined LWIP_HTTPD_MAX_REQ_LENGTH || defined __DOXYGEN__
+#define LWIP_HTTPD_MAX_REQ_LENGTH           LWIP_MIN(1023, (LWIP_HTTPD_REQ_QUEUELEN * PBUF_POOL_BUFSIZE))
+#endif
+#endif /* LWIP_HTTPD_SUPPORT_REQUESTLIST */
+
+/** This is the size of a static buffer used when URIs end with '/'.
+ * In this buffer, the directory requested is concatenated with all the
+ * configured default file names.
+ * Set to 0 to disable checking default filenames on non-root directories.
+ */
+#if !defined LWIP_HTTPD_MAX_REQUEST_URI_LEN || defined __DOXYGEN__
+#define LWIP_HTTPD_MAX_REQUEST_URI_LEN      63
+#endif
+
+/** Maximum length of the filename to send as response to a POST request,
+ * filled in by the application when a POST is finished.
+ */
+#if !defined LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN || defined __DOXYGEN__
+#define LWIP_HTTPD_POST_MAX_RESPONSE_URI_LEN 63
+#endif
+
+/** Set this to 0 to not send the SSI tag (default is on, so the tag will
+ * be sent in the HTML page */
+#if !defined LWIP_HTTPD_SSI_INCLUDE_TAG || defined __DOXYGEN__
+#define LWIP_HTTPD_SSI_INCLUDE_TAG           1
+#endif
+
+/** Set this to 1 to call tcp_abort when tcp_close fails with memory error.
+ * This can be used to prevent consuming all memory in situations where the
+ * HTTP server has low priority compared to other communication. */
+#if !defined LWIP_HTTPD_ABORT_ON_CLOSE_MEM_ERROR || defined __DOXYGEN__
+#define LWIP_HTTPD_ABORT_ON_CLOSE_MEM_ERROR  0
+#endif
+
+/** Set this to 1 to kill the oldest connection when running out of
+ * memory for 'struct http_state' or 'struct http_ssi_state'.
+ * ATTENTION: This puts all connections on a linked list, so may be kind of slow.
+ */
+#if !defined LWIP_HTTPD_KILL_OLD_ON_CONNECTIONS_EXCEEDED || defined __DOXYGEN__
+#define LWIP_HTTPD_KILL_OLD_ON_CONNECTIONS_EXCEEDED 0
+#endif
+
+/** Set this to 1 to send URIs without extension without headers
+ * (who uses this at all??) */
+#if !defined LWIP_HTTPD_OMIT_HEADER_FOR_EXTENSIONLESS_URI || defined __DOXYGEN__
+#define LWIP_HTTPD_OMIT_HEADER_FOR_EXTENSIONLESS_URI 0
+#endif
+
+/** Default: Tags are sent from struct http_state and are therefore volatile */
+#if !defined HTTP_IS_TAG_VOLATILE || defined __DOXYGEN__
+#define HTTP_IS_TAG_VOLATILE(ptr) TCP_WRITE_FLAG_COPY
+#endif
+
+/* By default, the httpd is limited to send 2*pcb->mss to keep resource usage low
+   when http is not an important protocol in the device. */
+#if !defined HTTPD_LIMIT_SENDING_TO_2MSS || defined __DOXYGEN__
+#define HTTPD_LIMIT_SENDING_TO_2MSS 1
+#endif
+
+/* Define this to a function that returns the maximum amount of data to enqueue.
+   The function have this signature: u16_t fn(struct altcp_pcb* pcb);
+   The best place to define this is the hooks file (@see LWIP_HOOK_FILENAME) */
+#if !defined HTTPD_MAX_WRITE_LEN || defined __DOXYGEN__
+#if HTTPD_LIMIT_SENDING_TO_2MSS
+#define HTTPD_MAX_WRITE_LEN(pcb)    ((u16_t)(2 * altcp_mss(pcb)))
+#endif
+#endif
+
+/*------------------- FS OPTIONS -------------------*/
+
+/** Set this to 1 and provide the functions:
+ * - "int fs_open_custom(struct fs_file *file, const char *name)"
+ *    Called first for every opened file to allow opening files
+ *    that are not included in fsdata(_custom).c
+ * - "void fs_close_custom(struct fs_file *file)"
+ *    Called to free resources allocated by fs_open_custom().
+ */
+#if !defined LWIP_HTTPD_CUSTOM_FILES || defined __DOXYGEN__
+#define LWIP_HTTPD_CUSTOM_FILES       0
+#endif
+
+/** Set this to 1 to support fs_read() to dynamically read file data.
+ * Without this (default=off), only one-block files are supported,
+ * and the contents must be ready after fs_open().
+ */
+#if !defined LWIP_HTTPD_DYNAMIC_FILE_READ || defined __DOXYGEN__
+#define LWIP_HTTPD_DYNAMIC_FILE_READ  0
+#endif
+
+/** Set this to 1 to include an application state argument per file
+ * that is opened. This allows to keep a state per connection/file.
+ */
+#if !defined LWIP_HTTPD_FILE_STATE || defined __DOXYGEN__
+#define LWIP_HTTPD_FILE_STATE         0
+#endif
+
+/** HTTPD_PRECALCULATED_CHECKSUM==1: include precompiled checksums for
+ * predefined (MSS-sized) chunks of the files to prevent having to calculate
+ * the checksums at runtime. */
+#if !defined HTTPD_PRECALCULATED_CHECKSUM || defined __DOXYGEN__
+#define HTTPD_PRECALCULATED_CHECKSUM  0
+#endif
+
+/** LWIP_HTTPD_FS_ASYNC_READ==1: support asynchronous read operations
+ * (fs_read_async returns FS_READ_DELAYED and calls a callback when finished).
+ */
+#if !defined LWIP_HTTPD_FS_ASYNC_READ || defined __DOXYGEN__
+#define LWIP_HTTPD_FS_ASYNC_READ      0
+#endif
+
+/** Filename (including path) to use as FS data file */
+#if !defined HTTPD_FSDATA_FILE || defined __DOXYGEN__
+/* HTTPD_USE_CUSTOM_FSDATA: Compatibility with deprecated lwIP option */
+#if defined(HTTPD_USE_CUSTOM_FSDATA) && (HTTPD_USE_CUSTOM_FSDATA != 0)
+#define HTTPD_FSDATA_FILE "fsdata.c"
+#else
+#define HTTPD_FSDATA_FILE "fsdata.c"
+#endif
+#endif
+
+/**
+ * @}
+ */
+
+#endif /* LWIP_HDR_APPS_HTTPD_OPTS_H */
@@ -0,0 +1,100 @@
+/**
+ * @file
+ * lwIP iPerf server implementation
+ */
+
+/*
+ * Copyright (c) 2014 Simon Goldschmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt
+ *
+ */
+#ifndef LWIP_HDR_APPS_LWIPERF_H
+#define LWIP_HDR_APPS_LWIPERF_H
+
+#include "lwip/opt.h"
+#include "lwip/ip_addr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define LWIPERF_TCP_PORT_DEFAULT  5001
+
+/** lwIPerf test results */
+enum lwiperf_report_type
+{
+  /** The server side test is done */
+  LWIPERF_TCP_DONE_SERVER,
+  /** The client side test is done */
+  LWIPERF_TCP_DONE_CLIENT,
+  /** Local error lead to test abort */
+  LWIPERF_TCP_ABORTED_LOCAL,
+  /** Data check error lead to test abort */
+  LWIPERF_TCP_ABORTED_LOCAL_DATAERROR,
+  /** Transmit error lead to test abort */
+  LWIPERF_TCP_ABORTED_LOCAL_TXERROR,
+  /** Remote side aborted the test */
+  LWIPERF_TCP_ABORTED_REMOTE
+};
+
+/** Control */
+enum lwiperf_client_type
+{
+  /** Unidirectional tx only test */
+  LWIPERF_CLIENT,
+  /** Do a bidirectional test simultaneously */
+  LWIPERF_DUAL,
+  /** Do a bidirectional test individually */
+  LWIPERF_TRADEOFF
+};
+
+/** Prototype of a report function that is called when a session is finished.
+    This report function can show the test results.
+    @param report_type contains the test result */
+typedef void (*lwiperf_report_fn)(void *arg, enum lwiperf_report_type report_type,
+  const ip_addr_t* local_addr, u16_t local_port, const ip_addr_t* remote_addr, u16_t remote_port,
+  u32_t bytes_transferred, u32_t ms_duration, u32_t bandwidth_kbitpsec);
+
+void* lwiperf_start_tcp_server(const ip_addr_t* local_addr, u16_t local_port,
+                               lwiperf_report_fn report_fn, void* report_arg);
+void* lwiperf_start_tcp_server_default(lwiperf_report_fn report_fn, void* report_arg);
+void* lwiperf_start_tcp_client(const ip_addr_t* remote_addr, u16_t remote_port,
+                               enum lwiperf_client_type type,
+                               lwiperf_report_fn report_fn, void* report_arg);
+void* lwiperf_start_tcp_client_default(const ip_addr_t* remote_addr,
+                               lwiperf_report_fn report_fn, void* report_arg);
+
+void  lwiperf_abort(void* lwiperf_session);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_LWIPERF_H */
@@ -0,0 +1,105 @@
+/**
+ * @file
+ * MDNS responder
+ */
+
+ /*
+ * Copyright (c) 2015 Verisure Innovation AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Erik Ekman <erik@kryo.se>
+ *
+ */
+
+#ifndef LWIP_HDR_APPS_MDNS_H
+#define LWIP_HDR_APPS_MDNS_H
+
+#include "lwip/apps/mdns_opts.h"
+#include "lwip/netif.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_MDNS_RESPONDER
+
+enum mdns_sd_proto {
+  DNSSD_PROTO_UDP = 0,
+  DNSSD_PROTO_TCP = 1
+};
+
+#define MDNS_PROBING_CONFLICT   0
+#define MDNS_PROBING_SUCCESSFUL 1
+
+#define MDNS_LABEL_MAXLEN  63
+
+struct mdns_host;
+struct mdns_service;
+
+/** Callback function to add text to a reply, called when generating the reply */
+typedef void (*service_get_txt_fn_t)(struct mdns_service *service, void *txt_userdata);
+
+/** Callback function to let application know the result of probing network for name
+ * uniqueness, called with result MDNS_PROBING_SUCCESSFUL if no other node claimed
+ * use for the name for the netif or a service and is safe to use, or MDNS_PROBING_CONFLICT
+ * if another node is already using it and mdns is disabled on this interface */
+typedef void (*mdns_name_result_cb_t)(struct netif* netif, u8_t result);
+
+void mdns_resp_init(void);
+
+void mdns_resp_register_name_result_cb(mdns_name_result_cb_t cb);
+
+err_t mdns_resp_add_netif(struct netif *netif, const char *hostname, u32_t dns_ttl);
+err_t mdns_resp_remove_netif(struct netif *netif);
+err_t mdns_resp_rename_netif(struct netif *netif, const char *hostname);
+
+s8_t  mdns_resp_add_service(struct netif *netif, const char *name, const char *service, enum mdns_sd_proto proto, u16_t port, u32_t dns_ttl, service_get_txt_fn_t txt_fn, void *txt_userdata);
+err_t mdns_resp_del_service(struct netif *netif, s8_t slot);
+err_t mdns_resp_rename_service(struct netif *netif, s8_t slot, const char *name);
+
+err_t mdns_resp_add_service_txtitem(struct mdns_service *service, const char *txt, u8_t txt_len);
+
+void mdns_resp_restart(struct netif *netif);
+void mdns_resp_announce(struct netif *netif);
+
+/**
+ * @ingroup mdns
+ * Announce IP settings have changed on netif.
+ * Call this in your callback registered by netif_set_status_callback().
+ * No need to call this function when LWIP_NETIF_EXT_STATUS_CALLBACK==1,
+ * this handled automatically for you.
+ * @param netif The network interface where settings have changed.
+ */
+#define mdns_resp_netif_settings_changed(netif) mdns_resp_announce(netif)
+
+#endif /* LWIP_MDNS_RESPONDER */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_MDNS_H */
@@ -0,0 +1,81 @@
+/**
+ * @file
+ * MDNS responder
+ */
+
+ /*
+ * Copyright (c) 2015 Verisure Innovation AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Erik Ekman <erik@kryo.se>
+ *
+ */
+
+#ifndef LWIP_HDR_APPS_MDNS_OPTS_H
+#define LWIP_HDR_APPS_MDNS_OPTS_H
+
+#include "lwip/opt.h"
+
+/**
+ * @defgroup mdns_opts Options
+ * @ingroup mdns
+ * @{
+ */
+
+/**
+ * LWIP_MDNS_RESPONDER==1: Turn on multicast DNS module. UDP must be available for MDNS
+ * transport. IGMP is needed for IPv4 multicast.
+ */
+#ifndef LWIP_MDNS_RESPONDER
+#define LWIP_MDNS_RESPONDER             0
+#endif /* LWIP_MDNS_RESPONDER */
+
+/** The maximum number of services per netif */
+#ifndef MDNS_MAX_SERVICES
+#define MDNS_MAX_SERVICES               1
+#endif
+
+/** MDNS_RESP_USENETIF_EXTCALLBACK==1: register an ext_callback on the netif
+ * to automatically restart probing/announcing on status or address change.
+ */
+#ifndef MDNS_RESP_USENETIF_EXTCALLBACK
+#define MDNS_RESP_USENETIF_EXTCALLBACK  LWIP_NETIF_EXT_STATUS_CALLBACK
+#endif
+
+/**
+ * MDNS_DEBUG: Enable debugging for multicast DNS.
+ */
+#ifndef MDNS_DEBUG
+#define MDNS_DEBUG                       LWIP_DBG_OFF
+#endif
+
+/**
+ * @}
+ */
+
+#endif /* LWIP_HDR_APPS_MDNS_OPTS_H */
+
@@ -0,0 +1,74 @@
+/**
+ * @file
+ * MDNS responder private definitions
+ */
+
+ /*
+ * Copyright (c) 2015 Verisure Innovation AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Erik Ekman <erik@kryo.se>
+ *
+ */
+#ifndef LWIP_HDR_MDNS_PRIV_H
+#define LWIP_HDR_MDNS_PRIV_H
+
+#include "lwip/apps/mdns_opts.h"
+#include "lwip/pbuf.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_MDNS_RESPONDER
+
+/* Domain struct and methods - visible for unit tests */
+
+#define MDNS_DOMAIN_MAXLEN 256
+#define MDNS_READNAME_ERROR 0xFFFF
+
+struct mdns_domain {
+  /* Encoded domain name */
+  u8_t name[MDNS_DOMAIN_MAXLEN];
+  /* Total length of domain name, including zero */
+  u16_t length;
+  /* Set if compression of this domain is not allowed */
+  u8_t skip_compression;
+};
+
+err_t mdns_domain_add_label(struct mdns_domain *domain, const char *label, u8_t len);
+u16_t mdns_readname(struct pbuf *p, u16_t offset, struct mdns_domain *domain);
+int mdns_domain_eq(struct mdns_domain *a, struct mdns_domain *b);
+u16_t mdns_compress_domain(struct pbuf *pbuf, u16_t *offset, struct mdns_domain *domain);
+
+#endif /* LWIP_MDNS_RESPONDER */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_MDNS_PRIV_H */
@@ -0,0 +1,205 @@
+/**
+ * @file
+ * MQTT client
+ */
+
+/*
+ * Copyright (c) 2016 Erik Andersson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Erik Andersson
+ *
+ */
+#ifndef LWIP_HDR_APPS_MQTT_CLIENT_H
+#define LWIP_HDR_APPS_MQTT_CLIENT_H
+
+#include "lwip/apps/mqtt_opts.h"
+#include "lwip/err.h"
+#include "lwip/ip_addr.h"
+#include "lwip/prot/iana.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct mqtt_client_s mqtt_client_t;
+
+#if LWIP_ALTCP && LWIP_ALTCP_TLS
+struct altcp_tls_config;
+#endif
+
+/** @ingroup mqtt
+ * Default MQTT port (non-TLS) */
+#define MQTT_PORT     LWIP_IANA_PORT_MQTT
+/** @ingroup mqtt
+ * Default MQTT TLS port */
+#define MQTT_TLS_PORT LWIP_IANA_PORT_SECURE_MQTT
+
+/*---------------------------------------------------------------------------------------------- */
+/* Connection with server */
+
+/**
+ * @ingroup mqtt
+ * Client information and connection parameters */
+struct mqtt_connect_client_info_t {
+  /** Client identifier, must be set by caller */
+  const char *client_id;
+  /** User name, set to NULL if not used */
+  const char* client_user;
+  /** Password, set to NULL if not used */
+  const char* client_pass;
+  /** keep alive time in seconds, 0 to disable keep alive functionality*/
+  u16_t keep_alive;
+  /** will topic, set to NULL if will is not to be used,
+      will_msg, will_qos and will retain are then ignored */
+  const char* will_topic;
+  /** will_msg, see will_topic */
+  const char* will_msg;
+  /** will_qos, see will_topic */
+  u8_t will_qos;
+  /** will_retain, see will_topic */
+  u8_t will_retain;
+#if LWIP_ALTCP && LWIP_ALTCP_TLS
+  /** TLS configuration for secure connections */
+  struct altcp_tls_config *tls_config;
+#endif
+};
+
+/**
+ * @ingroup mqtt
+ * Connection status codes */
+typedef enum
+{
+  /** Accepted */
+  MQTT_CONNECT_ACCEPTED                 = 0,
+  /** Refused protocol version */
+  MQTT_CONNECT_REFUSED_PROTOCOL_VERSION = 1,
+  /** Refused identifier */
+  MQTT_CONNECT_REFUSED_IDENTIFIER       = 2,
+  /** Refused server */
+  MQTT_CONNECT_REFUSED_SERVER           = 3,
+  /** Refused user credentials */
+  MQTT_CONNECT_REFUSED_USERNAME_PASS    = 4,
+  /** Refused not authorized */
+  MQTT_CONNECT_REFUSED_NOT_AUTHORIZED_  = 5,
+  /** Disconnected */
+  MQTT_CONNECT_DISCONNECTED             = 256,
+  /** Timeout */
+  MQTT_CONNECT_TIMEOUT                  = 257
+} mqtt_connection_status_t;
+
+/**
+ * @ingroup mqtt
+ * Function prototype for mqtt connection status callback. Called when
+ * client has connected to the server after initiating a mqtt connection attempt by
+ * calling mqtt_client_connect() or when connection is closed by server or an error
+ *
+ * @param client MQTT client itself
+ * @param arg Additional argument to pass to the callback function
+ * @param status Connect result code or disconnection notification @see mqtt_connection_status_t
+ *
+ */
+typedef void (*mqtt_connection_cb_t)(mqtt_client_t *client, void *arg, mqtt_connection_status_t status);
+
+
+/**
+ * @ingroup mqtt
+ * Data callback flags */
+enum {
+  /** Flag set when last fragment of data arrives in data callback */
+  MQTT_DATA_FLAG_LAST = 1
+};
+
+/** 
+ * @ingroup mqtt
+ * Function prototype for MQTT incoming publish data callback function. Called when data
+ * arrives to a subscribed topic @see mqtt_subscribe
+ *
+ * @param arg Additional argument to pass to the callback function
+ * @param data User data, pointed object, data may not be referenced after callback return,
+          NULL is passed when all publish data are delivered
+ * @param len Length of publish data fragment
+ * @param flags MQTT_DATA_FLAG_LAST set when this call contains the last part of data from publish message
+ *
+ */
+typedef void (*mqtt_incoming_data_cb_t)(void *arg, const u8_t *data, u16_t len, u8_t flags);
+
+
+/** 
+ * @ingroup mqtt
+ * Function prototype for MQTT incoming publish function. Called when an incoming publish
+ * arrives to a subscribed topic @see mqtt_subscribe
+ *
+ * @param arg Additional argument to pass to the callback function
+ * @param topic Zero terminated Topic text string, topic may not be referenced after callback return
+ * @param tot_len Total length of publish data, if set to 0 (no publish payload) data callback will not be invoked
+ */
+typedef void (*mqtt_incoming_publish_cb_t)(void *arg, const char *topic, u32_t tot_len);
+
+
+/**
+ * @ingroup mqtt
+ * Function prototype for mqtt request callback. Called when a subscribe, unsubscribe
+ * or publish request has completed
+ * @param arg Pointer to user data supplied when invoking request
+ * @param err ERR_OK on success
+ *            ERR_TIMEOUT if no response was received within timeout,
+ *            ERR_ABRT if (un)subscribe was denied
+ */
+typedef void (*mqtt_request_cb_t)(void *arg, err_t err);
+
+
+err_t mqtt_client_connect(mqtt_client_t *client, const ip_addr_t *ipaddr, u16_t port, mqtt_connection_cb_t cb, void *arg,
+                   const struct mqtt_connect_client_info_t *client_info);
+
+void mqtt_disconnect(mqtt_client_t *client);
+
+mqtt_client_t *mqtt_client_new(void);
+void mqtt_client_free(mqtt_client_t* client);
+
+u8_t mqtt_client_is_connected(mqtt_client_t *client);
+
+void mqtt_set_inpub_callback(mqtt_client_t *client, mqtt_incoming_publish_cb_t,
+                             mqtt_incoming_data_cb_t data_cb, void *arg);
+
+err_t mqtt_sub_unsub(mqtt_client_t *client, const char *topic, u8_t qos, mqtt_request_cb_t cb, void *arg, u8_t sub);
+
+/** @ingroup mqtt
+ *Subscribe to topic */
+#define mqtt_subscribe(client, topic, qos, cb, arg) mqtt_sub_unsub(client, topic, qos, cb, arg, 1)
+/** @ingroup mqtt
+ *  Unsubscribe to topic */
+#define mqtt_unsubscribe(client, topic, cb, arg) mqtt_sub_unsub(client, topic, 0, cb, arg, 0)
+
+err_t mqtt_publish(mqtt_client_t *client, const char *topic, const void *payload, u16_t payload_length, u8_t qos, u8_t retain,
+                                    mqtt_request_cb_t cb, void *arg);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_MQTT_CLIENT_H */
@@ -0,0 +1,103 @@
+/**
+ * @file
+ * MQTT client options
+ */
+
+/*
+ * Copyright (c) 2016 Erik Andersson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Erik Andersson
+ *
+ */
+#ifndef LWIP_HDR_APPS_MQTT_OPTS_H
+#define LWIP_HDR_APPS_MQTT_OPTS_H
+
+#include "lwip/opt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup mqtt_opts Options
+ * @ingroup mqtt
+ * @{
+ */
+
+/**
+ * Output ring-buffer size, must be able to fit largest outgoing publish message topic+payloads
+ */
+#ifndef MQTT_OUTPUT_RINGBUF_SIZE
+#define MQTT_OUTPUT_RINGBUF_SIZE 256
+#endif
+
+/**
+ * Number of bytes in receive buffer, must be at least the size of the longest incoming topic + 8
+ * If one wants to avoid fragmented incoming publish, set length to max incoming topic length + max payload length + 8
+ */
+#ifndef MQTT_VAR_HEADER_BUFFER_LEN
+#define MQTT_VAR_HEADER_BUFFER_LEN 128
+#endif
+
+/**
+ * Maximum number of pending subscribe, unsubscribe and publish requests to server .
+ */
+#ifndef MQTT_REQ_MAX_IN_FLIGHT
+#define MQTT_REQ_MAX_IN_FLIGHT 4
+#endif
+
+/**
+ * Seconds between each cyclic timer call.
+ */
+#ifndef MQTT_CYCLIC_TIMER_INTERVAL
+#define MQTT_CYCLIC_TIMER_INTERVAL 5
+#endif
+
+/**
+ * Publish, subscribe and unsubscribe request timeout in seconds.
+ */
+#ifndef MQTT_REQ_TIMEOUT
+#define MQTT_REQ_TIMEOUT 30
+#endif
+
+/**
+ * Seconds for MQTT connect response timeout after sending connect request
+ */
+#ifndef MQTT_CONNECT_TIMOUT
+#define MQTT_CONNECT_TIMOUT 100
+#endif
+
+/**
+ * @}
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_MQTT_OPTS_H */
@@ -0,0 +1,104 @@
+/**
+ * @file
+ * MQTT client (private interface)
+ */
+
+/*
+ * Copyright (c) 2016 Erik Andersson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Erik Andersson
+ *
+ */
+#ifndef LWIP_HDR_APPS_MQTT_PRIV_H
+#define LWIP_HDR_APPS_MQTT_PRIV_H
+
+#include "lwip/apps/mqtt.h"
+#include "lwip/altcp.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Pending request item, binds application callback to pending server requests */
+struct mqtt_request_t
+{
+  /** Next item in list, NULL means this is the last in chain,
+      next pointing at itself means request is unallocated */
+  struct mqtt_request_t *next;
+  /** Callback to upper layer */
+  mqtt_request_cb_t cb;
+  void *arg;
+  /** MQTT packet identifier */
+  u16_t pkt_id;
+  /** Expire time relative to element before this  */
+  u16_t timeout_diff;
+};
+
+/** Ring buffer */
+struct mqtt_ringbuf_t {
+  u16_t put;
+  u16_t get;
+  u8_t buf[MQTT_OUTPUT_RINGBUF_SIZE];
+};
+
+/** MQTT client */
+struct mqtt_client_s
+{
+  /** Timers and timeouts */
+  u16_t cyclic_tick;
+  u16_t keep_alive;
+  u16_t server_watchdog;
+  /** Packet identifier generator*/
+  u16_t pkt_id_seq;
+  /** Packet identifier of pending incoming publish */
+  u16_t inpub_pkt_id;
+  /** Connection state */
+  u8_t conn_state;
+  struct altcp_pcb *conn;
+  /** Connection callback */
+  void *connect_arg;
+  mqtt_connection_cb_t connect_cb;
+  /** Pending requests to server */
+  struct mqtt_request_t *pend_req_queue;
+  struct mqtt_request_t req_list[MQTT_REQ_MAX_IN_FLIGHT];
+  void *inpub_arg;
+  /** Incoming data callback */
+  mqtt_incoming_data_cb_t data_cb;
+  mqtt_incoming_publish_cb_t pub_cb;
+  /** Input */
+  u32_t msg_idx;
+  u8_t rx_buffer[MQTT_VAR_HEADER_BUFFER_LEN];
+  /** Output ring-buffer */
+  struct mqtt_ringbuf_t output;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_MQTT_PRIV_H */
@@ -0,0 +1,51 @@
+/**
+ * @file
+ * NETBIOS name service responder
+ */
+
+/*
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ */
+#ifndef LWIP_HDR_APPS_NETBIOS_H
+#define LWIP_HDR_APPS_NETBIOS_H
+
+#include "lwip/apps/netbiosns_opts.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void netbiosns_init(void);
+#ifndef NETBIOS_LWIP_NAME
+void netbiosns_set_name(const char* hostname);
+#endif
+void netbiosns_stop(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_NETBIOS_H */
@@ -0,0 +1,66 @@
+/**
+ * @file
+ * NETBIOS name service responder options
+ */
+
+/*
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ */
+#ifndef LWIP_HDR_APPS_NETBIOS_OPTS_H
+#define LWIP_HDR_APPS_NETBIOS_OPTS_H
+
+#include "lwip/opt.h"
+
+/**
+ * @defgroup netbiosns_opts Options
+ * @ingroup netbiosns
+ * @{
+ */
+
+/** NetBIOS name of lwip device
+ * This must be uppercase until NETBIOS_STRCMP() is defined to a string
+ * comparision function that is case insensitive.
+ * If you want to use the netif's hostname, use this (with LWIP_NETIF_HOSTNAME):
+ * (ip_current_netif() != NULL ? ip_current_netif()->hostname != NULL ? ip_current_netif()->hostname : "" : "")
+ *
+ * If this is not defined, netbiosns_set_name() can be called at runtime to change the name.
+ */
+#ifdef __DOXYGEN__
+#define NETBIOS_LWIP_NAME "NETBIOSLWIPDEV"
+#endif
+
+/** Respond to NetBIOS name queries
+ * Default is disabled
+ */
+#if !defined LWIP_NETBIOS_RESPOND_NAME_QUERY || defined __DOXYGEN__
+#define LWIP_NETBIOS_RESPOND_NAME_QUERY   0
+#endif
+
+/**
+ * @}
+ */
+
+#endif /* LWIP_HDR_APPS_NETBIOS_OPTS_H */
@@ -0,0 +1,128 @@
+#ifndef LWIP_HDR_APPS_SMTP_H
+#define LWIP_HDR_APPS_SMTP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "lwip/apps/smtp_opts.h"
+#include "lwip/err.h"
+#include "lwip/prot/iana.h"
+
+/** The default TCP port used for SMTP */
+#define SMTP_DEFAULT_PORT         LWIP_IANA_PORT_SMTP
+/** The default TCP port used for SMTPS */
+#define SMTPS_DEFAULT_PORT        LWIP_IANA_PORT_SMTPS
+
+/** Email successfully sent */
+#define SMTP_RESULT_OK            0
+/** Unknown error */
+#define SMTP_RESULT_ERR_UNKNOWN   1
+/** Connection to server failed */
+#define SMTP_RESULT_ERR_CONNECT   2
+/** Failed to resolve server hostname */
+#define SMTP_RESULT_ERR_HOSTNAME  3
+/** Connection unexpectedly closed by remote server */
+#define SMTP_RESULT_ERR_CLOSED    4
+/** Connection timed out (server didn't respond in time) */
+#define SMTP_RESULT_ERR_TIMEOUT   5
+/** Server responded with an unknown response code */
+#define SMTP_RESULT_ERR_SVR_RESP  6
+/** Out of resources locally */
+#define SMTP_RESULT_ERR_MEM       7
+
+/** Prototype of an smtp callback function
+ *
+ * @param arg argument specified when initiating the email
+ * @param smtp_result result of the mail transfer (see defines SMTP_RESULT_*)
+ * @param srv_err if aborted by the server, this contains the error code received
+ * @param err an error returned by internal lwip functions, can help to specify
+ *            the source of the error but must not necessarily be != ERR_OK
+ */
+typedef void (*smtp_result_fn)(void *arg, u8_t smtp_result, u16_t srv_err, err_t err);
+
+/** This structure is used as argument for smtp_send_mail_int(),
+ * which in turn can be used with tcpip_callback() to send mail
+ * from interrupt context, e.g. like this:
+ *    struct smtp_send_request *req; (to be filled)
+ *    tcpip_try_callback(smtp_send_mail_int, (void*)req);
+ *
+ * For member description, see parameter description of smtp_send_mail().
+ * When using with tcpip_callback, this structure has to stay allocated
+ * (e.g. using mem_malloc/mem_free) until its 'callback_fn' is called.
+ */
+struct smtp_send_request {
+  const char *from;
+  const char* to;
+  const char* subject;
+  const char* body;
+  smtp_result_fn callback_fn;
+  void* callback_arg;
+  /** If this is != 0, data is *not* copied into an extra buffer
+   * but used from the pointers supplied in this struct.
+   * This means less memory usage, but data must stay untouched until
+   * the callback function is called. */
+  u8_t static_data;
+};
+
+
+#if SMTP_BODYDH
+
+#ifndef SMTP_BODYDH_BUFFER_SIZE
+#define SMTP_BODYDH_BUFFER_SIZE 256
+#endif /* SMTP_BODYDH_BUFFER_SIZE */
+
+struct smtp_bodydh {
+  u16_t state;
+  u16_t length; /* Length of content in buffer */
+  char buffer[SMTP_BODYDH_BUFFER_SIZE]; /* buffer for generated content */
+#ifdef SMTP_BODYDH_USER_SIZE
+  u8_t user[SMTP_BODYDH_USER_SIZE];
+#endif /* SMTP_BODYDH_USER_SIZE */
+};
+
+enum bdh_retvals_e {
+  BDH_DONE = 0,
+  BDH_WORKING
+};
+
+/** Prototype of an smtp body callback function
+ * It receives a struct smtp_bodydh, and a buffer to write data,
+ * must return BDH_WORKING to be called again and BDH_DONE when
+ * it has finished processing. This one tries to fill one TCP buffer with
+ * data, your function will be repeatedly called until that happens; so if you
+ * know you'll be taking too long to serve your request, pause once in a while
+ * by writing length=0 to avoid hogging system resources
+ *
+ * @param arg argument specified when initiating the email
+ * @param smtp_bodydh state handling + buffer structure
+ */
+typedef int (*smtp_bodycback_fn)(void *arg, struct smtp_bodydh *bodydh);
+
+err_t smtp_send_mail_bodycback(const char *from, const char* to, const char* subject,
+                     smtp_bodycback_fn bodycback_fn, smtp_result_fn callback_fn, void* callback_arg);
+
+#endif /* SMTP_BODYDH */
+
+
+err_t smtp_set_server_addr(const char* server);
+void smtp_set_server_port(u16_t port);
+#if LWIP_ALTCP && LWIP_ALTCP_TLS
+struct altcp_tls_config;
+void smtp_set_tls_config(struct altcp_tls_config *tls_config);
+#endif
+err_t smtp_set_auth(const char* username, const char* pass);
+err_t smtp_send_mail(const char *from, const char* to, const char* subject, const char* body,
+                     smtp_result_fn callback_fn, void* callback_arg);
+err_t smtp_send_mail_static(const char *from, const char* to, const char* subject, const char* body,
+                     smtp_result_fn callback_fn, void* callback_arg);
+void smtp_send_mail_int(void *arg);
+#ifdef LWIP_DEBUG
+const char* smtp_result_str(u8_t smtp_result);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_SMTP_H */
@@ -0,0 +1,81 @@
+#ifndef LWIP_HDR_APPS_SMTP_OPTS_H
+#define LWIP_HDR_APPS_SMTP_OPTS_H
+
+#include "lwip/opt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+/**
+ * @defgroup smtp_opts Options
+ * @ingroup smtp
+ * 
+ * @{
+ */
+    
+/** Set this to 1 to enable data handler callback on BODY */
+#ifndef SMTP_BODYDH
+#define SMTP_BODYDH             0
+#endif
+
+/** SMTP_DEBUG: Enable debugging for SNTP. */
+#ifndef SMTP_DEBUG
+#define SMTP_DEBUG              LWIP_DBG_OFF
+#endif
+
+/** Maximum length reserved for server name including terminating 0 byte */
+#ifndef SMTP_MAX_SERVERNAME_LEN
+#define SMTP_MAX_SERVERNAME_LEN 256
+#endif
+
+/** Maximum length reserved for username */
+#ifndef SMTP_MAX_USERNAME_LEN
+#define SMTP_MAX_USERNAME_LEN   32
+#endif
+
+/** Maximum length reserved for password */
+#ifndef SMTP_MAX_PASS_LEN
+#define SMTP_MAX_PASS_LEN       32
+#endif
+
+/** Set this to 0 if you know the authentication data will not change
+ * during the smtp session, which saves some heap space. */
+#ifndef SMTP_COPY_AUTHDATA
+#define SMTP_COPY_AUTHDATA      1
+#endif
+
+/** Set this to 0 to save some code space if you know for sure that all data
+ * passed to this module conforms to the requirements in the SMTP RFC.
+ * WARNING: use this with care!
+ */
+#ifndef SMTP_CHECK_DATA
+#define SMTP_CHECK_DATA         1
+#endif
+
+/** Set this to 1 to enable AUTH PLAIN support */
+#ifndef SMTP_SUPPORT_AUTH_PLAIN
+#define SMTP_SUPPORT_AUTH_PLAIN 1
+#endif
+
+/** Set this to 1 to enable AUTH LOGIN support */
+#ifndef SMTP_SUPPORT_AUTH_LOGIN
+#define SMTP_SUPPORT_AUTH_LOGIN 1
+#endif
+
+/* Memory allocation/deallocation can be overridden... */
+#ifndef SMTP_STATE_MALLOC
+#define SMTP_STATE_MALLOC(size)       mem_malloc(size)
+#define SMTP_STATE_FREE(ptr)          mem_free(ptr)
+#endif
+
+/**
+ * @}
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SMTP_OPTS_H */
+
@@ -0,0 +1,135 @@
+/**
+ * @file
+ * SNMP server main API - start and basic configuration
+ */
+
+/*
+ * Copyright (c) 2001, 2002 Leon Woestenberg <leon.woestenberg@axon.tv>
+ * Copyright (c) 2001, 2002 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Leon Woestenberg <leon.woestenberg@axon.tv>
+ *         Martin Hentschel <info@cl-soft.de>
+ *
+ */
+#ifndef LWIP_HDR_APPS_SNMP_H
+#define LWIP_HDR_APPS_SNMP_H
+
+#include "lwip/apps/snmp_opts.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/err.h"
+#include "lwip/apps/snmp_core.h"
+
+/** SNMP variable binding descriptor (publically needed for traps) */
+struct snmp_varbind
+{
+  /** pointer to next varbind, NULL for last in list */
+  struct snmp_varbind *next;
+  /** pointer to previous varbind, NULL for first in list */
+  struct snmp_varbind *prev;
+
+  /** object identifier */
+  struct snmp_obj_id oid;
+
+  /** value ASN1 type */
+  u8_t type;
+  /** object value length */
+  u16_t value_len;
+  /** object value */
+  void *value;
+};
+
+/**
+ * @ingroup snmp_core
+ * Agent setup, start listening to port 161.
+ */
+void snmp_init(void);
+void snmp_set_mibs(const struct snmp_mib **mibs, u8_t num_mibs);
+
+void snmp_set_device_enterprise_oid(const struct snmp_obj_id* device_enterprise_oid);
+const struct snmp_obj_id* snmp_get_device_enterprise_oid(void);
+
+void snmp_trap_dst_enable(u8_t dst_idx, u8_t enable);
+void snmp_trap_dst_ip_set(u8_t dst_idx, const ip_addr_t *dst);
+
+/** Generic trap: cold start */
+#define SNMP_GENTRAP_COLDSTART 0
+/** Generic trap: warm start */
+#define SNMP_GENTRAP_WARMSTART 1
+/** Generic trap: link down */
+#define SNMP_GENTRAP_LINKDOWN 2
+/** Generic trap: link up */
+#define SNMP_GENTRAP_LINKUP 3
+/** Generic trap: authentication failure */
+#define SNMP_GENTRAP_AUTH_FAILURE 4
+/** Generic trap: EGP neighbor lost */
+#define SNMP_GENTRAP_EGP_NEIGHBOR_LOSS 5
+/** Generic trap: enterprise specific */
+#define SNMP_GENTRAP_ENTERPRISE_SPECIFIC 6
+
+err_t snmp_send_trap_generic(s32_t generic_trap);
+err_t snmp_send_trap_specific(s32_t specific_trap, struct snmp_varbind *varbinds);
+err_t snmp_send_trap(const struct snmp_obj_id* oid, s32_t generic_trap, s32_t specific_trap, struct snmp_varbind *varbinds);
+
+#define SNMP_AUTH_TRAPS_DISABLED 0
+#define SNMP_AUTH_TRAPS_ENABLED  1
+void snmp_set_auth_traps_enabled(u8_t enable);
+u8_t snmp_get_auth_traps_enabled(void);
+
+u8_t snmp_v1_enabled(void);
+u8_t snmp_v2c_enabled(void);
+u8_t snmp_v3_enabled(void);
+void snmp_v1_enable(u8_t enable);
+void snmp_v2c_enable(u8_t enable);
+void snmp_v3_enable(u8_t enable);
+
+const char * snmp_get_community(void);
+const char * snmp_get_community_write(void);
+const char * snmp_get_community_trap(void);
+void snmp_set_community(const char * const community);
+void snmp_set_community_write(const char * const community);
+void snmp_set_community_trap(const char * const community);
+
+void snmp_coldstart_trap(void);
+void snmp_authfail_trap(void);
+
+typedef void (*snmp_write_callback_fct)(const u32_t* oid, u8_t oid_len, void* callback_arg);
+void snmp_set_write_callback(snmp_write_callback_fct write_callback, void* callback_arg);
+
+#endif /* LWIP_SNMP */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_SNMP_H */
@@ -0,0 +1,377 @@
+/**
+ * @file
+ * SNMP core API for implementing MIBs
+ */
+
+/*
+ * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Christiaan Simons <christiaan.simons@axon.tv>
+ *         Martin Hentschel <info@cl-soft.de>
+ */
+
+#ifndef LWIP_HDR_APPS_SNMP_CORE_H
+#define LWIP_HDR_APPS_SNMP_CORE_H
+
+#include "lwip/apps/snmp_opts.h"
+
+#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/ip_addr.h"
+#include "lwip/err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* basic ASN1 defines */
+#define SNMP_ASN1_CLASS_UNIVERSAL   0x00
+#define SNMP_ASN1_CLASS_APPLICATION 0x40
+#define SNMP_ASN1_CLASS_CONTEXT     0x80
+#define SNMP_ASN1_CLASS_PRIVATE     0xC0
+
+#define SNMP_ASN1_CONTENTTYPE_PRIMITIVE   0x00
+#define SNMP_ASN1_CONTENTTYPE_CONSTRUCTED 0x20
+
+/* universal tags (from ASN.1 spec.) */
+#define SNMP_ASN1_UNIVERSAL_END_OF_CONTENT  0
+#define SNMP_ASN1_UNIVERSAL_INTEGER         2
+#define SNMP_ASN1_UNIVERSAL_OCTET_STRING    4
+#define SNMP_ASN1_UNIVERSAL_NULL            5
+#define SNMP_ASN1_UNIVERSAL_OBJECT_ID       6
+#define SNMP_ASN1_UNIVERSAL_SEQUENCE_OF    16
+
+/* application specific (SNMP) tags (from SNMPv2-SMI) */
+#define SNMP_ASN1_APPLICATION_IPADDR    0  /* [APPLICATION 0] IMPLICIT OCTET STRING (SIZE (4)) */
+#define SNMP_ASN1_APPLICATION_COUNTER   1  /* [APPLICATION 1] IMPLICIT INTEGER (0..4294967295) => u32_t */
+#define SNMP_ASN1_APPLICATION_GAUGE     2  /* [APPLICATION 2] IMPLICIT INTEGER (0..4294967295) => u32_t */
+#define SNMP_ASN1_APPLICATION_TIMETICKS 3  /* [APPLICATION 3] IMPLICIT INTEGER (0..4294967295) => u32_t */
+#define SNMP_ASN1_APPLICATION_OPAQUE    4  /* [APPLICATION 4] IMPLICIT OCTET STRING */
+#define SNMP_ASN1_APPLICATION_COUNTER64 6  /* [APPLICATION 6] IMPLICIT INTEGER (0..18446744073709551615) */
+
+/* context specific (SNMP) tags (from RFC 1905) */
+#define SNMP_ASN1_CONTEXT_VARBIND_NO_SUCH_INSTANCE 1
+
+/* full ASN1 type defines */
+#define SNMP_ASN1_TYPE_END_OF_CONTENT (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_END_OF_CONTENT)
+#define SNMP_ASN1_TYPE_INTEGER        (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_INTEGER)
+#define SNMP_ASN1_TYPE_OCTET_STRING   (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_OCTET_STRING)
+#define SNMP_ASN1_TYPE_NULL           (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_NULL)
+#define SNMP_ASN1_TYPE_OBJECT_ID      (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_UNIVERSAL_OBJECT_ID)
+#define SNMP_ASN1_TYPE_SEQUENCE       (SNMP_ASN1_CLASS_UNIVERSAL | SNMP_ASN1_CONTENTTYPE_CONSTRUCTED | SNMP_ASN1_UNIVERSAL_SEQUENCE_OF)
+#define SNMP_ASN1_TYPE_IPADDR         (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_IPADDR)
+#define SNMP_ASN1_TYPE_IPADDRESS      SNMP_ASN1_TYPE_IPADDR
+#define SNMP_ASN1_TYPE_COUNTER        (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_COUNTER)
+#define SNMP_ASN1_TYPE_COUNTER32      SNMP_ASN1_TYPE_COUNTER
+#define SNMP_ASN1_TYPE_GAUGE          (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_GAUGE)
+#define SNMP_ASN1_TYPE_GAUGE32        SNMP_ASN1_TYPE_GAUGE
+#define SNMP_ASN1_TYPE_UNSIGNED32     SNMP_ASN1_TYPE_GAUGE
+#define SNMP_ASN1_TYPE_TIMETICKS      (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_TIMETICKS)
+#define SNMP_ASN1_TYPE_OPAQUE         (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_OPAQUE)
+#if LWIP_HAVE_INT64
+#define SNMP_ASN1_TYPE_COUNTER64      (SNMP_ASN1_CLASS_APPLICATION | SNMP_ASN1_CONTENTTYPE_PRIMITIVE | SNMP_ASN1_APPLICATION_COUNTER64)
+#endif
+
+#define SNMP_VARBIND_EXCEPTION_OFFSET 0xF0
+#define SNMP_VARBIND_EXCEPTION_MASK   0x0F
+
+/** error codes predefined by SNMP prot. */
+typedef enum {
+  SNMP_ERR_NOERROR             = 0,
+/* 
+outdated v1 error codes. do not use anmore!
+#define SNMP_ERR_NOSUCHNAME 2  use SNMP_ERR_NOSUCHINSTANCE instead
+#define SNMP_ERR_BADVALUE   3  use SNMP_ERR_WRONGTYPE,SNMP_ERR_WRONGLENGTH,SNMP_ERR_WRONGENCODING or SNMP_ERR_WRONGVALUE instead
+#define SNMP_ERR_READONLY   4  use SNMP_ERR_NOTWRITABLE instead
+*/
+  SNMP_ERR_GENERROR            = 5,
+  SNMP_ERR_NOACCESS            = 6,
+  SNMP_ERR_WRONGTYPE           = 7,
+  SNMP_ERR_WRONGLENGTH         = 8,
+  SNMP_ERR_WRONGENCODING       = 9,
+  SNMP_ERR_WRONGVALUE          = 10,
+  SNMP_ERR_NOCREATION          = 11,
+  SNMP_ERR_INCONSISTENTVALUE   = 12,
+  SNMP_ERR_RESOURCEUNAVAILABLE = 13,
+  SNMP_ERR_COMMITFAILED        = 14,
+  SNMP_ERR_UNDOFAILED          = 15,
+  SNMP_ERR_NOTWRITABLE         = 17,
+  SNMP_ERR_INCONSISTENTNAME    = 18,
+
+  SNMP_ERR_NOSUCHINSTANCE      = SNMP_VARBIND_EXCEPTION_OFFSET + SNMP_ASN1_CONTEXT_VARBIND_NO_SUCH_INSTANCE
+} snmp_err_t;
+
+/** internal object identifier representation */
+struct snmp_obj_id
+{
+  u8_t len;
+  u32_t id[SNMP_MAX_OBJ_ID_LEN];
+};
+
+struct snmp_obj_id_const_ref
+{
+  u8_t len;
+  const u32_t* id;
+};
+
+extern const struct snmp_obj_id_const_ref snmp_zero_dot_zero; /* administrative identifier from SNMPv2-SMI */
+
+/** SNMP variant value, used as reference in struct snmp_node_instance and table implementation */
+union snmp_variant_value
+{
+  void* ptr;
+  const void* const_ptr;
+  u32_t u32;
+  s32_t s32;
+#if LWIP_HAVE_INT64
+  u64_t u64;
+#endif
+};
+
+
+/**
+SNMP MIB node types
+ tree node is the only node the stack can process in order to walk the tree,
+ all other nodes are assumed to be leaf nodes.
+ This cannot be an enum because users may want to define their own node types.
+*/
+#define SNMP_NODE_TREE         0x00
+/* predefined leaf node types */
+#define SNMP_NODE_SCALAR       0x01
+#define SNMP_NODE_SCALAR_ARRAY 0x02
+#define SNMP_NODE_TABLE        0x03
+#define SNMP_NODE_THREADSYNC   0x04
+
+/** node "base class" layout, the mandatory fields for a node  */
+struct snmp_node
+{
+  /** one out of SNMP_NODE_TREE or any leaf node type (like SNMP_NODE_SCALAR) */
+  u8_t node_type;
+  /** the number assigned to this node which used as part of the full OID */
+  u32_t oid;
+};
+
+/** SNMP node instance access types */
+typedef enum {
+  SNMP_NODE_INSTANCE_ACCESS_READ    = 1,
+  SNMP_NODE_INSTANCE_ACCESS_WRITE   = 2,
+  SNMP_NODE_INSTANCE_READ_ONLY      = SNMP_NODE_INSTANCE_ACCESS_READ,
+  SNMP_NODE_INSTANCE_READ_WRITE     = (SNMP_NODE_INSTANCE_ACCESS_READ | SNMP_NODE_INSTANCE_ACCESS_WRITE),
+  SNMP_NODE_INSTANCE_WRITE_ONLY     = SNMP_NODE_INSTANCE_ACCESS_WRITE,
+  SNMP_NODE_INSTANCE_NOT_ACCESSIBLE = 0
+} snmp_access_t;
+
+struct snmp_node_instance;
+
+typedef s16_t (*node_instance_get_value_method)(struct snmp_node_instance*, void*);
+typedef snmp_err_t (*node_instance_set_test_method)(struct snmp_node_instance*, u16_t, void*);
+typedef snmp_err_t (*node_instance_set_value_method)(struct snmp_node_instance*, u16_t, void*);
+typedef void (*node_instance_release_method)(struct snmp_node_instance*);
+
+#define SNMP_GET_VALUE_RAW_DATA 0x4000  /* do not use 0x8000 because return value of node_instance_get_value_method is signed16 and 0x8000 would be the signed bit */
+
+/** SNMP node instance */
+struct snmp_node_instance
+{
+  /** prefilled with the node, get_instance() is called on; may be changed by user to any value to pass an arbitrary node between calls to get_instance() and get_value/test_value/set_value */
+  const struct snmp_node* node;
+  /** prefilled with the instance id requested; for get_instance() this is the exact oid requested; for get_next_instance() this is the relative starting point, stack expects relative oid of next node here */
+  struct snmp_obj_id instance_oid;
+
+  /** ASN type for this object (see snmp_asn1.h for definitions) */
+  u8_t asn1_type;
+  /** one out of instance access types defined above (SNMP_NODE_INSTANCE_READ_ONLY,...) */
+  snmp_access_t access;
+
+  /** returns object value for the given object identifier. Return values <0 to indicate an error */
+  node_instance_get_value_method get_value;
+  /** tests length and/or range BEFORE setting */
+  node_instance_set_test_method set_test;
+  /** sets object value, only called when set_test() was successful */
+  node_instance_set_value_method set_value;
+  /** called in any case when the instance is not required anymore by stack (useful for freeing memory allocated in get_instance/get_next_instance methods) */
+  node_instance_release_method release_instance;
+
+  /** reference to pass arbitrary value between calls to get_instance() and get_value/test_value/set_value */
+  union snmp_variant_value reference;
+  /** see reference (if reference is a pointer, the length of underlying data may be stored here or anything else) */
+  u32_t reference_len;
+};
+
+
+/** SNMP tree node */
+struct snmp_tree_node
+{
+  /** inherited "base class" members */
+  struct snmp_node node;
+  u16_t subnode_count;
+  const struct snmp_node* const *subnodes;
+};
+
+#define SNMP_CREATE_TREE_NODE(oid, subnodes) \
+  {{ SNMP_NODE_TREE, (oid) }, \
+  (u16_t)LWIP_ARRAYSIZE(subnodes), (subnodes) }
+
+#define SNMP_CREATE_EMPTY_TREE_NODE(oid) \
+  {{ SNMP_NODE_TREE, (oid) }, \
+  0, NULL }
+
+/** SNMP leaf node */
+struct snmp_leaf_node
+{
+  /** inherited "base class" members */
+  struct snmp_node node;
+  snmp_err_t (*get_instance)(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+  snmp_err_t (*get_next_instance)(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+};
+
+/** represents a single mib with its base oid and root node */
+struct snmp_mib
+{
+  const u32_t *base_oid;
+  u8_t base_oid_len;
+  const struct snmp_node *root_node;
+};
+
+#define SNMP_MIB_CREATE(oid_list, root_node) { (oid_list), (u8_t)LWIP_ARRAYSIZE(oid_list), root_node }
+
+/** OID range structure */
+struct snmp_oid_range
+{
+  u32_t min;
+  u32_t max;
+};
+
+/** checks if incoming OID length and values are in allowed ranges */
+u8_t snmp_oid_in_range(const u32_t *oid_in, u8_t oid_len, const struct snmp_oid_range *oid_ranges, u8_t oid_ranges_len);
+
+typedef enum {
+  SNMP_NEXT_OID_STATUS_SUCCESS,
+  SNMP_NEXT_OID_STATUS_NO_MATCH,
+  SNMP_NEXT_OID_STATUS_BUF_TO_SMALL
+} snmp_next_oid_status_t;
+
+/** state for next_oid_init / next_oid_check functions */
+struct snmp_next_oid_state
+{
+  const u32_t* start_oid;
+  u8_t start_oid_len;
+
+  u32_t* next_oid;
+  u8_t next_oid_len;
+  u8_t next_oid_max_len;
+
+  snmp_next_oid_status_t status;
+  void* reference;
+};
+
+void snmp_next_oid_init(struct snmp_next_oid_state *state,
+  const u32_t *start_oid, u8_t start_oid_len,
+  u32_t *next_oid_buf, u8_t next_oid_max_len);
+u8_t snmp_next_oid_precheck(struct snmp_next_oid_state *state, const u32_t *oid, u8_t oid_len);
+u8_t snmp_next_oid_check(struct snmp_next_oid_state *state, const u32_t *oid, u8_t oid_len, void* reference);
+
+void snmp_oid_assign(struct snmp_obj_id* target, const u32_t *oid, u8_t oid_len);
+void snmp_oid_combine(struct snmp_obj_id* target, const u32_t *oid1, u8_t oid1_len, const u32_t *oid2, u8_t oid2_len);
+void snmp_oid_prefix(struct snmp_obj_id* target, const u32_t *oid, u8_t oid_len);
+void snmp_oid_append(struct snmp_obj_id* target, const u32_t *oid, u8_t oid_len);
+u8_t snmp_oid_equal(const u32_t *oid1, u8_t oid1_len, const u32_t *oid2, u8_t oid2_len);
+s8_t snmp_oid_compare(const u32_t *oid1, u8_t oid1_len, const u32_t *oid2, u8_t oid2_len);
+
+#if LWIP_IPV4
+u8_t snmp_oid_to_ip4(const u32_t *oid, ip4_addr_t *ip);
+void snmp_ip4_to_oid(const ip4_addr_t *ip, u32_t *oid);
+#endif /* LWIP_IPV4 */
+#if LWIP_IPV6
+u8_t snmp_oid_to_ip6(const u32_t *oid, ip6_addr_t *ip);
+void snmp_ip6_to_oid(const ip6_addr_t *ip, u32_t *oid);
+#endif /* LWIP_IPV6 */
+#if LWIP_IPV4 || LWIP_IPV6
+u8_t snmp_ip_to_oid(const ip_addr_t *ip, u32_t *oid);
+u8_t snmp_ip_port_to_oid(const ip_addr_t *ip, u16_t port, u32_t *oid);
+
+u8_t snmp_oid_to_ip(const u32_t *oid, u8_t oid_len, ip_addr_t *ip);
+u8_t snmp_oid_to_ip_port(const u32_t *oid, u8_t oid_len, ip_addr_t *ip, u16_t *port);
+#endif /* LWIP_IPV4 || LWIP_IPV6 */
+
+struct netif;
+u8_t netif_to_num(const struct netif *netif);
+
+snmp_err_t snmp_set_test_ok(struct snmp_node_instance* instance, u16_t value_len, void* value); /* generic function which can be used if test is always successful */
+
+err_t snmp_decode_bits(const u8_t *buf, u32_t buf_len, u32_t *bit_value);
+err_t snmp_decode_truthvalue(const s32_t *asn1_value, u8_t *bool_value);
+u8_t  snmp_encode_bits(u8_t *buf, u32_t buf_len, u32_t bit_value, u8_t bit_count);
+u8_t  snmp_encode_truthvalue(s32_t *asn1_value, u32_t bool_value);
+
+struct snmp_statistics
+{
+  u32_t inpkts;
+  u32_t outpkts;
+  u32_t inbadversions;
+  u32_t inbadcommunitynames;
+  u32_t inbadcommunityuses;
+  u32_t inasnparseerrs;
+  u32_t intoobigs;
+  u32_t innosuchnames;
+  u32_t inbadvalues;
+  u32_t inreadonlys;
+  u32_t ingenerrs;
+  u32_t intotalreqvars;
+  u32_t intotalsetvars;
+  u32_t ingetrequests;
+  u32_t ingetnexts;
+  u32_t insetrequests;
+  u32_t ingetresponses;
+  u32_t intraps;
+  u32_t outtoobigs;
+  u32_t outnosuchnames;
+  u32_t outbadvalues;
+  u32_t outgenerrs;
+  u32_t outgetrequests;
+  u32_t outgetnexts;
+  u32_t outsetrequests;
+  u32_t outgetresponses;
+  u32_t outtraps;
+#if LWIP_SNMP_V3
+  u32_t unsupportedseclevels;
+  u32_t notintimewindows;
+  u32_t unknownusernames;
+  u32_t unknownengineids;
+  u32_t wrongdigests;
+  u32_t decryptionerrors;
+#endif
+};
+
+extern struct snmp_statistics snmp_stats;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_SNMP */
+
+#endif /* LWIP_HDR_APPS_SNMP_CORE_H */
@@ -0,0 +1,78 @@
+/**
+ * @file
+ * SNMP MIB2 API
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Dirk Ziegelmeier <dziegel@gmx.de>
+ *
+ */
+#ifndef LWIP_HDR_APPS_SNMP_MIB2_H
+#define LWIP_HDR_APPS_SNMP_MIB2_H
+
+#include "lwip/apps/snmp_opts.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
+#if SNMP_LWIP_MIB2
+
+#include "lwip/apps/snmp_core.h"
+
+extern const struct snmp_mib mib2;
+
+#if SNMP_USE_NETCONN
+#include "lwip/apps/snmp_threadsync.h"
+void snmp_mib2_lwip_synchronizer(snmp_threadsync_called_fn fn, void* arg);
+extern struct snmp_threadsync_instance snmp_mib2_lwip_locks;
+#endif
+
+#ifndef SNMP_SYSSERVICES
+#define SNMP_SYSSERVICES ((1 << 6) | (1 << 3) | ((IP_FORWARD) << 2))
+#endif
+
+void snmp_mib2_set_sysdescr(const u8_t* str, const u16_t* len); /* read-only be defintion */
+void snmp_mib2_set_syscontact(u8_t *ocstr, u16_t *ocstrlen, u16_t bufsize);
+void snmp_mib2_set_syscontact_readonly(const u8_t *ocstr, const u16_t *ocstrlen);
+void snmp_mib2_set_sysname(u8_t *ocstr, u16_t *ocstrlen, u16_t bufsize);
+void snmp_mib2_set_sysname_readonly(const u8_t *ocstr, const u16_t *ocstrlen);
+void snmp_mib2_set_syslocation(u8_t *ocstr, u16_t *ocstrlen, u16_t bufsize);
+void snmp_mib2_set_syslocation_readonly(const u8_t *ocstr, const u16_t *ocstrlen);
+
+#endif /* SNMP_LWIP_MIB2 */
+#endif /* LWIP_SNMP */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_SNMP_MIB2_H */
@@ -0,0 +1,297 @@
+/**
+ * @file
+ * SNMP server options list
+ */
+
+/*
+ * Copyright (c) 2015 Dirk Ziegelmeier
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Dirk Ziegelmeier
+ *
+ */
+#ifndef LWIP_HDR_SNMP_OPTS_H
+#define LWIP_HDR_SNMP_OPTS_H
+
+#include "lwip/opt.h"
+
+/**
+ * @defgroup snmp_opts Options
+ * @ingroup snmp
+ * @{
+ */
+
+/**
+ * LWIP_SNMP==1: This enables the lwIP SNMP agent. UDP must be available
+ * for SNMP transport.
+ * If you want to use your own SNMP agent, leave this disabled.
+ * To integrate MIB2 of an external agent, you need to enable
+ * LWIP_MIB2_CALLBACKS and MIB2_STATS. This will give you the callbacks
+ * and statistics counters you need to get MIB2 working.
+ */
+#if !defined LWIP_SNMP || defined __DOXYGEN__
+#define LWIP_SNMP                       0
+#endif
+
+/**
+ * SNMP_USE_NETCONN: Use netconn API instead of raw API.
+ * Makes SNMP agent run in a worker thread, so blocking operations
+ * can be done in MIB calls.
+ */
+#if !defined SNMP_USE_NETCONN || defined __DOXYGEN__
+#define SNMP_USE_NETCONN           0
+#endif
+
+/**
+ * SNMP_USE_RAW: Use raw API.
+ * SNMP agent does not run in a worker thread, so blocking operations
+ * should not be done in MIB calls.
+ */
+#if !defined SNMP_USE_RAW || defined __DOXYGEN__
+#define SNMP_USE_RAW               1
+#endif
+
+#if SNMP_USE_NETCONN && SNMP_USE_RAW
+#error SNMP stack can use only one of the APIs {raw, netconn}
+#endif
+
+#if LWIP_SNMP && !SNMP_USE_NETCONN && !SNMP_USE_RAW
+#error SNMP stack needs a receive API and UDP {raw, netconn}
+#endif
+
+#if SNMP_USE_NETCONN
+/**
+ * SNMP_STACK_SIZE: Stack size of SNMP netconn worker thread
+ */
+#if !defined SNMP_STACK_SIZE || defined __DOXYGEN__
+#define SNMP_STACK_SIZE            DEFAULT_THREAD_STACKSIZE
+#endif
+
+/**
+ * SNMP_THREAD_PRIO: SNMP netconn worker thread priority
+ */
+#if !defined SNMP_THREAD_PRIO || defined __DOXYGEN__
+#define SNMP_THREAD_PRIO           DEFAULT_THREAD_PRIO
+#endif
+#endif /* SNMP_USE_NETCONN */
+
+/**
+ * SNMP_TRAP_DESTINATIONS: Number of trap destinations. At least one trap
+ * destination is required
+ */
+#if !defined SNMP_TRAP_DESTINATIONS || defined __DOXYGEN__
+#define SNMP_TRAP_DESTINATIONS          1
+#endif
+
+/**
+ * Only allow SNMP write actions that are 'safe' (e.g. disabling netifs is not
+ * a safe action and disabled when SNMP_SAFE_REQUESTS = 1).
+ * Unsafe requests are disabled by default!
+ */
+#if !defined SNMP_SAFE_REQUESTS || defined __DOXYGEN__
+#define SNMP_SAFE_REQUESTS              1
+#endif
+
+/**
+ * The maximum length of strings used.
+ */
+#if !defined SNMP_MAX_OCTET_STRING_LEN || defined __DOXYGEN__
+#define SNMP_MAX_OCTET_STRING_LEN       127
+#endif
+
+/**
+ * The maximum number of Sub ID's inside an object identifier.
+ * Indirectly this also limits the maximum depth of SNMP tree.
+ */
+#if !defined SNMP_MAX_OBJ_ID_LEN || defined __DOXYGEN__
+#define SNMP_MAX_OBJ_ID_LEN             50
+#endif
+
+#if !defined SNMP_MAX_VALUE_SIZE || defined __DOXYGEN__
+/**
+ * The minimum size of a value.
+ */
+#define SNMP_MIN_VALUE_SIZE             (2 * sizeof(u32_t*)) /* size required to store the basic types (8 bytes for counter64) */
+/**
+ * The maximum size of a value.
+ */
+#define SNMP_MAX_VALUE_SIZE             LWIP_MAX(LWIP_MAX((SNMP_MAX_OCTET_STRING_LEN), sizeof(u32_t)*(SNMP_MAX_OBJ_ID_LEN)), SNMP_MIN_VALUE_SIZE)
+#endif
+
+/**
+ * The snmp read-access community. Used for write-access and traps, too
+ * unless SNMP_COMMUNITY_WRITE or SNMP_COMMUNITY_TRAP are enabled, respectively.
+ */
+#if !defined SNMP_COMMUNITY || defined __DOXYGEN__
+#define SNMP_COMMUNITY                  "public"
+#endif
+
+/**
+ * The snmp write-access community.
+ * Set this community to "" in order to disallow any write access.
+ */
+#if !defined SNMP_COMMUNITY_WRITE || defined __DOXYGEN__
+#define SNMP_COMMUNITY_WRITE            "private"
+#endif
+
+/**
+ * The snmp community used for sending traps.
+ */
+#if !defined SNMP_COMMUNITY_TRAP || defined __DOXYGEN__
+#define SNMP_COMMUNITY_TRAP             "public"
+#endif
+
+/**
+ * The maximum length of community string.
+ * If community names shall be adjusted at runtime via snmp_set_community() calls,
+ * enter here the possible maximum length (+1 for terminating null character).
+ */
+#if !defined SNMP_MAX_COMMUNITY_STR_LEN || defined __DOXYGEN__
+#define SNMP_MAX_COMMUNITY_STR_LEN LWIP_MAX(LWIP_MAX(sizeof(SNMP_COMMUNITY), sizeof(SNMP_COMMUNITY_WRITE)), sizeof(SNMP_COMMUNITY_TRAP))
+#endif
+
+/**
+ * The OID identifiying the device. This may be the enterprise OID itself or any OID located below it in tree.
+ */
+#if !defined SNMP_DEVICE_ENTERPRISE_OID || defined __DOXYGEN__
+#define SNMP_LWIP_ENTERPRISE_OID 26381
+/**
+ * IANA assigned enterprise ID for lwIP is 26381
+ * @see http://www.iana.org/assignments/enterprise-numbers
+ *
+ * @note this enterprise ID is assigned to the lwIP project,
+ * all object identifiers living under this ID are assigned
+ * by the lwIP maintainers!
+ * @note don't change this define, use snmp_set_device_enterprise_oid()
+ *
+ * If you need to create your own private MIB you'll need
+ * to apply for your own enterprise ID with IANA:
+ * http://www.iana.org/numbers.html
+ */
+#define SNMP_DEVICE_ENTERPRISE_OID {1, 3, 6, 1, 4, 1, SNMP_LWIP_ENTERPRISE_OID}
+/**
+ * Length of SNMP_DEVICE_ENTERPRISE_OID
+ */
+#define SNMP_DEVICE_ENTERPRISE_OID_LEN 7
+#endif
+
+/**
+ * SNMP_DEBUG: Enable debugging for SNMP messages.
+ */
+#if !defined SNMP_DEBUG || defined __DOXYGEN__
+#define SNMP_DEBUG                      LWIP_DBG_OFF
+#endif
+
+/**
+ * SNMP_MIB_DEBUG: Enable debugging for SNMP MIBs.
+ */
+#if !defined SNMP_MIB_DEBUG || defined __DOXYGEN__
+#define SNMP_MIB_DEBUG                  LWIP_DBG_OFF
+#endif
+
+/**
+ * Indicates if the MIB2 implementation of LWIP SNMP stack is used.
+ */
+#if !defined SNMP_LWIP_MIB2 || defined __DOXYGEN__
+#define SNMP_LWIP_MIB2                      LWIP_SNMP
+#endif
+
+/**
+ * Value return for sysDesc field of MIB2.
+ */
+#if !defined SNMP_LWIP_MIB2_SYSDESC || defined __DOXYGEN__
+#define SNMP_LWIP_MIB2_SYSDESC              "lwIP"
+#endif
+
+/**
+ * Value return for sysName field of MIB2.
+ * To make sysName field settable, call snmp_mib2_set_sysname() to provide the necessary buffers.
+ */
+#if !defined SNMP_LWIP_MIB2_SYSNAME || defined __DOXYGEN__
+#define SNMP_LWIP_MIB2_SYSNAME              "FQDN-unk"
+#endif
+
+/**
+ * Value return for sysContact field of MIB2.
+ * To make sysContact field settable, call snmp_mib2_set_syscontact() to provide the necessary buffers.
+ */
+#if !defined SNMP_LWIP_MIB2_SYSCONTACT || defined __DOXYGEN__
+#define SNMP_LWIP_MIB2_SYSCONTACT           ""
+#endif
+
+/**
+ * Value return for sysLocation field of MIB2.
+ * To make sysLocation field settable, call snmp_mib2_set_syslocation() to provide the necessary buffers.
+ */
+#if !defined SNMP_LWIP_MIB2_SYSLOCATION || defined __DOXYGEN__
+#define SNMP_LWIP_MIB2_SYSLOCATION          ""
+#endif
+
+/**
+ * This value is used to limit the repetitions processed in GetBulk requests (value == 0 means no limitation).
+ * This may be useful to limit the load for a single request.
+ * According to SNMP RFC 1905 it is allowed to not return all requested variables from a GetBulk request if system load would be too high.
+ * so the effect is that the client will do more requests to gather all data.
+ * For the stack this could be useful in case that SNMP processing is done in TCP/IP thread. In this situation a request with many
+ * repetitions could block the thread for a longer time. Setting limit here will keep the stack more responsive.
+ */
+#if !defined SNMP_LWIP_GETBULK_MAX_REPETITIONS || defined __DOXYGEN__
+#define SNMP_LWIP_GETBULK_MAX_REPETITIONS 0
+#endif
+
+/**
+ * @}
+ */
+
+/*
+   ------------------------------------
+   ---------- SNMPv3 options ----------
+   ------------------------------------
+*/
+
+/**
+ * LWIP_SNMP_V3==1: This enables EXPERIMENTAL SNMPv3 support. LWIP_SNMP must
+ * also be enabled.
+ * THIS IS UNDER DEVELOPMENT AND SHOULD NOT BE ENABLED IN PRODUCTS.
+ */
+#ifndef LWIP_SNMP_V3
+#define LWIP_SNMP_V3               0
+#endif
+
+#ifndef LWIP_SNMP_V3_MBEDTLS
+#define LWIP_SNMP_V3_MBEDTLS       LWIP_SNMP_V3
+#endif
+
+#ifndef LWIP_SNMP_V3_CRYPTO
+#define LWIP_SNMP_V3_CRYPTO        LWIP_SNMP_V3_MBEDTLS
+#endif
+
+#ifndef LWIP_SNMP_CONFIGURE_VERSIONS
+#define LWIP_SNMP_CONFIGURE_VERSIONS 0
+#endif
+
+#endif /* LWIP_HDR_SNMP_OPTS_H */
@@ -0,0 +1,113 @@
+/**
+ * @file
+ * SNMP server MIB API to implement scalar nodes
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Martin Hentschel <info@cl-soft.de>
+ *
+ */
+
+#ifndef LWIP_HDR_APPS_SNMP_SCALAR_H
+#define LWIP_HDR_APPS_SNMP_SCALAR_H
+
+#include "lwip/apps/snmp_opts.h"
+#include "lwip/apps/snmp_core.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
+
+/** basic scalar node */
+struct snmp_scalar_node
+{
+  /** inherited "base class" members */
+  struct snmp_leaf_node node;
+  u8_t asn1_type;
+  snmp_access_t access;
+  node_instance_get_value_method get_value;
+  node_instance_set_test_method set_test;
+  node_instance_set_value_method set_value;
+};
+
+
+snmp_err_t snmp_scalar_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+snmp_err_t snmp_scalar_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+
+#define SNMP_SCALAR_CREATE_NODE(oid, access, asn1_type, get_value_method, set_test_method, set_value_method) \
+  {{{ SNMP_NODE_SCALAR, (oid) }, \
+    snmp_scalar_get_instance, \
+    snmp_scalar_get_next_instance }, \
+    (asn1_type), (access), (get_value_method), (set_test_method), (set_value_method) }
+
+#define SNMP_SCALAR_CREATE_NODE_READONLY(oid, asn1_type, get_value_method) SNMP_SCALAR_CREATE_NODE(oid, SNMP_NODE_INSTANCE_READ_ONLY, asn1_type, get_value_method, NULL, NULL)
+
+/** scalar array node - a tree node which contains scalars only as children */
+struct snmp_scalar_array_node_def
+{
+  u32_t         oid;
+  u8_t          asn1_type;
+  snmp_access_t access;
+};
+
+typedef s16_t (*snmp_scalar_array_get_value_method)(const struct snmp_scalar_array_node_def*, void*);
+typedef snmp_err_t (*snmp_scalar_array_set_test_method)(const struct snmp_scalar_array_node_def*, u16_t, void*);
+typedef snmp_err_t (*snmp_scalar_array_set_value_method)(const struct snmp_scalar_array_node_def*, u16_t, void*);
+
+/** basic scalar array node */
+struct snmp_scalar_array_node
+{
+  /** inherited "base class" members */
+  struct snmp_leaf_node node;
+  u16_t array_node_count;
+  const struct snmp_scalar_array_node_def* array_nodes;
+  snmp_scalar_array_get_value_method get_value;
+  snmp_scalar_array_set_test_method set_test;
+  snmp_scalar_array_set_value_method set_value;
+};
+
+snmp_err_t snmp_scalar_array_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+snmp_err_t snmp_scalar_array_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+
+#define SNMP_SCALAR_CREATE_ARRAY_NODE(oid, array_nodes, get_value_method, set_test_method, set_value_method) \
+  {{{ SNMP_NODE_SCALAR_ARRAY, (oid) }, \
+    snmp_scalar_array_get_instance, \
+    snmp_scalar_array_get_next_instance }, \
+    (u16_t)LWIP_ARRAYSIZE(array_nodes), (array_nodes), (get_value_method), (set_test_method), (set_value_method) }
+
+#endif /* LWIP_SNMP */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_SNMP_SCALAR_H */
@@ -0,0 +1,32 @@
+/*
+Generated by LwipMibCompiler
+*/
+
+#ifndef LWIP_HDR_APPS_SNMP_FRAMEWORK_MIB_H
+#define LWIP_HDR_APPS_SNMP_FRAMEWORK_MIB_H
+
+#include "lwip/apps/snmp_opts.h"
+#if LWIP_SNMP
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include "lwip/apps/snmp_core.h"
+
+extern const struct snmp_obj_id usmNoAuthProtocol;
+extern const struct snmp_obj_id usmHMACMD5AuthProtocol;
+extern const struct snmp_obj_id usmHMACSHAAuthProtocol;
+
+extern const struct snmp_obj_id usmNoPrivProtocol;
+extern const struct snmp_obj_id usmDESPrivProtocol;
+extern const struct snmp_obj_id usmAESPrivProtocol;
+
+extern const struct snmp_mib snmpframeworkmib;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* LWIP_SNMP */
+#endif /* LWIP_HDR_APPS_SNMP_FRAMEWORK_MIB_H */
@@ -0,0 +1,24 @@
+/*
+Generated by LwipMibCompiler
+*/
+
+#ifndef LWIP_HDR_APPS_SNMP_USER_BASED_SM_MIB_H
+#define LWIP_HDR_APPS_SNMP_USER_BASED_SM_MIB_H
+
+#include "lwip/apps/snmp_opts.h"
+#if LWIP_SNMP
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include "lwip/apps/snmp_core.h"
+
+extern const struct snmp_mib snmpusmmib;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* LWIP_SNMP */
+#endif /* LWIP_HDR_APPS_SNMP_USER_BASED_SM_MIB_H */
@@ -0,0 +1,134 @@
+/**
+ * @file
+ * SNMP server MIB API to implement table nodes
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Martin Hentschel <info@cl-soft.de>
+ *
+ */
+
+#ifndef LWIP_HDR_APPS_SNMP_TABLE_H
+#define LWIP_HDR_APPS_SNMP_TABLE_H
+
+#include "lwip/apps/snmp_opts.h"
+#include "lwip/apps/snmp_core.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
+
+/** default (customizable) read/write table */
+struct snmp_table_col_def
+{
+  u32_t index;
+  u8_t asn1_type;
+  snmp_access_t access;
+};
+
+/** table node */
+struct snmp_table_node
+{
+  /** inherited "base class" members */
+  struct snmp_leaf_node node;
+  u16_t column_count;
+  const struct snmp_table_col_def* columns;
+  snmp_err_t (*get_cell_instance)(const u32_t* column, const u32_t* row_oid, u8_t row_oid_len, struct snmp_node_instance* cell_instance);
+  snmp_err_t (*get_next_cell_instance)(const u32_t* column, struct snmp_obj_id* row_oid, struct snmp_node_instance* cell_instance);
+  /** returns object value for the given object identifier */
+  node_instance_get_value_method get_value;
+  /** tests length and/or range BEFORE setting */
+  node_instance_set_test_method set_test;
+  /** sets object value, only called when set_test() was successful */
+  node_instance_set_value_method set_value;
+};
+
+snmp_err_t snmp_table_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+snmp_err_t snmp_table_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+
+#define SNMP_TABLE_CREATE(oid, columns, get_cell_instance_method, get_next_cell_instance_method, get_value_method, set_test_method, set_value_method) \
+  {{{ SNMP_NODE_TABLE, (oid) }, \
+  snmp_table_get_instance, \
+  snmp_table_get_next_instance }, \
+  (u16_t)LWIP_ARRAYSIZE(columns), (columns), \
+  (get_cell_instance_method), (get_next_cell_instance_method), \
+  (get_value_method), (set_test_method), (set_value_method)}
+
+#define SNMP_TABLE_GET_COLUMN_FROM_OID(oid) ((oid)[1]) /* first array value is (fixed) row entry (fixed to 1) and 2nd value is column, follow3ed by instance */
+
+
+/** simple read-only table */
+typedef enum {
+  SNMP_VARIANT_VALUE_TYPE_U32,
+  SNMP_VARIANT_VALUE_TYPE_S32,
+  SNMP_VARIANT_VALUE_TYPE_PTR,
+  SNMP_VARIANT_VALUE_TYPE_CONST_PTR
+} snmp_table_column_data_type_t;
+
+struct snmp_table_simple_col_def
+{
+  u32_t index;
+  u8_t asn1_type;
+  snmp_table_column_data_type_t data_type; /* depending of what union member is used to store the value*/
+};
+
+/** simple read-only table node */
+struct snmp_table_simple_node
+{
+  /* inherited "base class" members */
+  struct snmp_leaf_node node;
+  u16_t column_count;
+  const struct snmp_table_simple_col_def* columns;
+  snmp_err_t (*get_cell_value)(const u32_t* column, const u32_t* row_oid, u8_t row_oid_len, union snmp_variant_value* value, u32_t* value_len);
+  snmp_err_t (*get_next_cell_instance_and_value)(const u32_t* column, struct snmp_obj_id* row_oid, union snmp_variant_value* value, u32_t* value_len);
+};
+
+snmp_err_t snmp_table_simple_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+snmp_err_t snmp_table_simple_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+
+#define SNMP_TABLE_CREATE_SIMPLE(oid, columns, get_cell_value_method, get_next_cell_instance_and_value_method) \
+  {{{ SNMP_NODE_TABLE, (oid) }, \
+  snmp_table_simple_get_instance, \
+  snmp_table_simple_get_next_instance }, \
+  (u16_t)LWIP_ARRAYSIZE(columns), (columns), (get_cell_value_method), (get_next_cell_instance_and_value_method) }
+
+s16_t snmp_table_extract_value_from_s32ref(struct snmp_node_instance* instance, void* value);
+s16_t snmp_table_extract_value_from_u32ref(struct snmp_node_instance* instance, void* value);
+s16_t snmp_table_extract_value_from_refconstptr(struct snmp_node_instance* instance, void* value);
+
+#endif /* LWIP_SNMP */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_SNMP_TABLE_H */
@@ -0,0 +1,114 @@
+/**
+ * @file
+ * SNMP server MIB API to implement thread synchronization
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Dirk Ziegelmeier <dziegel@gmx.de>
+ *
+ */
+
+#ifndef LWIP_HDR_APPS_SNMP_THREADSYNC_H
+#define LWIP_HDR_APPS_SNMP_THREADSYNC_H
+
+#include "lwip/apps/snmp_opts.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_SNMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/apps/snmp_core.h"
+#include "lwip/sys.h"
+
+typedef void (*snmp_threadsync_called_fn)(void* arg);
+typedef void (*snmp_threadsync_synchronizer_fn)(snmp_threadsync_called_fn fn, void* arg);
+
+
+/** Thread sync runtime data. For internal usage only. */
+struct threadsync_data
+{
+  union {
+    snmp_err_t err;
+    s16_t s16;
+  } retval;
+  union {
+    const u32_t *root_oid;
+    void *value;
+  } arg1;
+  union {
+    u8_t root_oid_len;
+    u16_t len;
+  } arg2;
+  const struct snmp_threadsync_node *threadsync_node;
+  struct snmp_node_instance proxy_instance;
+};
+
+/** Thread sync instance. Needed EXCATLY once for every thread to be synced into. */
+struct snmp_threadsync_instance
+{
+  sys_sem_t                       sem;
+  sys_mutex_t                     sem_usage_mutex;
+  snmp_threadsync_synchronizer_fn sync_fn;
+  struct threadsync_data          data;
+};
+
+/** SNMP thread sync proxy leaf node */
+struct snmp_threadsync_node
+{
+  /* inherited "base class" members */
+  struct snmp_leaf_node           node;
+
+  const struct snmp_leaf_node     *target;
+  struct snmp_threadsync_instance *instance;
+};
+
+snmp_err_t snmp_threadsync_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+snmp_err_t snmp_threadsync_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance);
+
+/** Create thread sync proxy node */
+#define SNMP_CREATE_THREAD_SYNC_NODE(oid, target_leaf_node, threadsync_instance) \
+  {{{ SNMP_NODE_THREADSYNC, (oid) }, \
+    snmp_threadsync_get_instance, \
+    snmp_threadsync_get_next_instance }, \
+    (target_leaf_node), \
+    (threadsync_instance) }
+
+/** Create thread sync instance data */
+void snmp_threadsync_init(struct snmp_threadsync_instance *instance, snmp_threadsync_synchronizer_fn sync_fn);
+
+#endif /* LWIP_SNMP */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_SNMP_THREADSYNC_H */
@@ -0,0 +1,114 @@
+/**
+ * @file
+ * Additional SNMPv3 functionality RFC3414 and RFC3826.
+ */
+
+/*
+ * Copyright (c) 2016 Elias Oenal.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Elias Oenal <lwip@eliasoenal.com>
+ */
+
+#ifndef LWIP_HDR_APPS_SNMP_V3_H
+#define LWIP_HDR_APPS_SNMP_V3_H
+
+#include "lwip/apps/snmp_opts.h"
+#include "lwip/err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if LWIP_SNMP && LWIP_SNMP_V3
+
+typedef enum
+{
+  SNMP_V3_AUTH_ALGO_INVAL = 0,
+  SNMP_V3_AUTH_ALGO_MD5   = 1,
+  SNMP_V3_AUTH_ALGO_SHA   = 2
+} snmpv3_auth_algo_t;
+
+typedef enum
+{
+  SNMP_V3_PRIV_ALGO_INVAL = 0,
+  SNMP_V3_PRIV_ALGO_DES   = 1,
+  SNMP_V3_PRIV_ALGO_AES   = 2
+} snmpv3_priv_algo_t;
+
+typedef enum
+{
+  SNMP_V3_USER_STORAGETYPE_OTHER       = 1,
+  SNMP_V3_USER_STORAGETYPE_VOLATILE    = 2,
+  SNMP_V3_USER_STORAGETYPE_NONVOLATILE = 3,
+  SNMP_V3_USER_STORAGETYPE_PERMANENT   = 4,
+  SNMP_V3_USER_STORAGETYPE_READONLY    = 5
+} snmpv3_user_storagetype_t;
+
+/*
+ * The following callback functions must be implemented by the application.
+ * There is a dummy implementation in snmpv3_dummy.c.
+ */
+
+void snmpv3_get_engine_id(const char **id, u8_t *len);
+err_t snmpv3_set_engine_id(const char* id, u8_t len);
+
+u32_t snmpv3_get_engine_boots(void);
+void snmpv3_set_engine_boots(u32_t boots);
+
+u32_t snmpv3_get_engine_time(void);
+void snmpv3_reset_engine_time(void);
+
+err_t snmpv3_get_user(const char* username, snmpv3_auth_algo_t *auth_algo, u8_t *auth_key, snmpv3_priv_algo_t *priv_algo, u8_t *priv_key);
+u8_t snmpv3_get_amount_of_users(void);
+err_t snmpv3_get_user_storagetype(const char *username, snmpv3_user_storagetype_t *storagetype);
+err_t snmpv3_get_username(char *username, u8_t index);
+
+/* The following functions are provided by the SNMPv3 agent */
+
+void snmpv3_engine_id_changed(void);
+s32_t snmpv3_get_engine_time_internal(void);
+
+void snmpv3_password_to_key_md5(
+    const u8_t *password,     /* IN */
+    size_t      passwordlen,  /* IN */
+    const u8_t *engineID,     /* IN  - pointer to snmpEngineID  */
+    u8_t        engineLength, /* IN  - length of snmpEngineID */
+    u8_t       *key);         /* OUT - pointer to caller 16-octet buffer */
+
+void snmpv3_password_to_key_sha(
+    const u8_t *password,     /* IN */
+    size_t      passwordlen,  /* IN */
+    const u8_t *engineID,     /* IN  - pointer to snmpEngineID  */
+    u8_t        engineLength, /* IN  - length of snmpEngineID */
+    u8_t       *key);         /* OUT - pointer to caller 20-octet buffer */
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_SNMP_V3_H */
@@ -0,0 +1,80 @@
+/**
+ * @file
+ * SNTP client API
+ */
+
+/*
+ * Copyright (c) 2007-2009 Frédéric Bernon, Simon Goldschmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Frédéric Bernon, Simon Goldschmidt
+ *
+ */
+#ifndef LWIP_HDR_APPS_SNTP_H
+#define LWIP_HDR_APPS_SNTP_H
+
+#include "lwip/apps/sntp_opts.h"
+#include "lwip/ip_addr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* SNTP operating modes: default is to poll using unicast.
+   The mode has to be set before calling sntp_init(). */
+#define SNTP_OPMODE_POLL            0
+#define SNTP_OPMODE_LISTENONLY      1
+void sntp_setoperatingmode(u8_t operating_mode);
+u8_t sntp_getoperatingmode(void);
+
+void sntp_init(void);
+void sntp_stop(void);
+u8_t sntp_enabled(void);
+
+void sntp_setserver(u8_t idx, const ip_addr_t *addr);
+const ip_addr_t* sntp_getserver(u8_t idx);
+
+#if SNTP_MONITOR_SERVER_REACHABILITY
+u8_t sntp_getreachability(u8_t idx);
+#endif /* SNTP_MONITOR_SERVER_REACHABILITY */
+
+#if SNTP_SERVER_DNS
+void sntp_setservername(u8_t idx, const char *server);
+const char *sntp_getservername(u8_t idx);
+#endif /* SNTP_SERVER_DNS */
+
+#if SNTP_GET_SERVERS_FROM_DHCP
+void sntp_servermode_dhcp(int set_servers_from_dhcp);
+#else /* SNTP_GET_SERVERS_FROM_DHCP */
+#define sntp_servermode_dhcp(x)
+#endif /* SNTP_GET_SERVERS_FROM_DHCP */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_SNTP_H */
@@ -0,0 +1,209 @@
+/**
+ * @file
+ * SNTP client options list
+ */
+
+/*
+ * Copyright (c) 2007-2009 Frédéric Bernon, Simon Goldschmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Frédéric Bernon, Simon Goldschmidt
+ *
+ */
+#ifndef LWIP_HDR_APPS_SNTP_OPTS_H
+#define LWIP_HDR_APPS_SNTP_OPTS_H
+
+#include "lwip/opt.h"
+#include "lwip/prot/iana.h"
+
+/**
+ * @defgroup sntp_opts Options
+ * @ingroup sntp
+ * @{
+ */
+
+/** SNTP macro to change system time in seconds
+ * Define SNTP_SET_SYSTEM_TIME_US(sec, us) to set the time in microseconds
+ * instead of this one if you need the additional precision. Alternatively,
+ * define SNTP_SET_SYSTEM_TIME_NTP(sec, frac) in order to work with native
+ * NTP timestamps instead.
+ */
+#if !defined SNTP_SET_SYSTEM_TIME || defined __DOXYGEN__
+#define SNTP_SET_SYSTEM_TIME(sec)   LWIP_UNUSED_ARG(sec)
+#endif
+
+/** The maximum number of SNTP servers that can be set */
+#if !defined SNTP_MAX_SERVERS || defined __DOXYGEN__
+#define SNTP_MAX_SERVERS           LWIP_DHCP_MAX_NTP_SERVERS
+#endif
+
+/** Set this to 1 to implement the callback function called by dhcp when
+ * NTP servers are received. */
+#if !defined SNTP_GET_SERVERS_FROM_DHCP || defined __DOXYGEN__
+#define SNTP_GET_SERVERS_FROM_DHCP LWIP_DHCP_GET_NTP_SRV
+#endif
+
+/** Set this to 1 to support DNS names (or IP address strings) to set sntp servers
+ * One server address/name can be defined as default if SNTP_SERVER_DNS == 1:
+ * \#define SNTP_SERVER_ADDRESS "pool.ntp.org"
+ */
+#if !defined SNTP_SERVER_DNS || defined __DOXYGEN__
+#define SNTP_SERVER_DNS            0
+#endif
+
+/**
+ * SNTP_DEBUG: Enable debugging for SNTP.
+ */
+#if !defined SNTP_DEBUG || defined __DOXYGEN__
+#define SNTP_DEBUG                  LWIP_DBG_OFF
+#endif
+
+/** SNTP server port */
+#if !defined SNTP_PORT || defined __DOXYGEN__
+#define SNTP_PORT                   LWIP_IANA_PORT_SNTP
+#endif
+
+/** Sanity check:
+ * Define this to
+ * - 0 to turn off sanity checks (default; smaller code)
+ * - >= 1 to check address and port of the response packet to ensure the
+ *        response comes from the server we sent the request to.
+ * - >= 2 to check returned Originate Timestamp against Transmit Timestamp
+ *        sent to the server (to ensure response to older request).
+ * - >= 3 @todo: discard reply if any of the VN, Stratum, or Transmit Timestamp
+ *        fields is 0 or the Mode field is not 4 (unicast) or 5 (broadcast).
+ * - >= 4 @todo: to check that the Root Delay and Root Dispersion fields are each
+ *        greater than or equal to 0 and less than infinity, where infinity is
+ *        currently a cozy number like one second. This check avoids using a
+ *        server whose synchronization source has expired for a very long time.
+ */
+#if !defined SNTP_CHECK_RESPONSE || defined __DOXYGEN__
+#define SNTP_CHECK_RESPONSE         0
+#endif
+
+/** Enable round-trip delay compensation.
+ * Compensate for the round-trip delay by calculating the clock offset from
+ * the originate, receive, transmit and destination timestamps, as per RFC.
+ *
+ * The calculation requires compiler support for 64-bit integers. Also, either
+ * SNTP_SET_SYSTEM_TIME_US or SNTP_SET_SYSTEM_TIME_NTP has to be implemented
+ * for setting the system clock with sub-second precision. Likewise, either
+ * SNTP_GET_SYSTEM_TIME or SNTP_GET_SYSTEM_TIME_NTP needs to be implemented
+ * with sub-second precision.
+ *
+ * Although not strictly required, it makes sense to combine this option with
+ * SNTP_CHECK_RESPONSE >= 2 for sanity-checking of the received timestamps.
+ * Also, in order for the round-trip calculation to work, the difference
+ * between the local clock and the NTP server clock must not be larger than
+ * about 34 years. If that limit is exceeded, the implementation will fall back
+ * to setting the clock without compensation. In order to ensure that the local
+ * clock is always within the permitted range for compensation, even at first
+ * try, it may be necessary to store at least the current year in non-volatile
+ * memory.
+ */
+#if !defined SNTP_COMP_ROUNDTRIP || defined __DOXYGEN__
+#define SNTP_COMP_ROUNDTRIP         0
+#endif
+
+/** According to the RFC, this shall be a random delay
+ * between 1 and 5 minutes (in milliseconds) to prevent load peaks.
+ * This can be defined to a random generation function,
+ * which must return the delay in milliseconds as u32_t.
+ * Turned off by default.
+ */
+#if !defined SNTP_STARTUP_DELAY || defined __DOXYGEN__
+#ifdef LWIP_RAND
+#define SNTP_STARTUP_DELAY          1
+#else
+#define SNTP_STARTUP_DELAY          0
+#endif
+#endif
+
+/** If you want the startup delay to be a function, define this
+ * to a function (including the brackets) and define SNTP_STARTUP_DELAY to 1.
+ */
+#if !defined SNTP_STARTUP_DELAY_FUNC || defined __DOXYGEN__
+#define SNTP_STARTUP_DELAY_FUNC     (LWIP_RAND() % 5000)
+#endif
+
+/** SNTP receive timeout - in milliseconds
+ * Also used as retry timeout - this shouldn't be too low.
+ * Default is 15 seconds. Must not be beolw 15 seconds by specification (i.e. 15000)
+ */
+#if !defined SNTP_RECV_TIMEOUT || defined __DOXYGEN__
+#define SNTP_RECV_TIMEOUT           15000
+#endif
+
+/** SNTP update delay - in milliseconds
+ * Default is 1 hour. Must not be beolw 60 seconds by specification (i.e. 60000)
+ */
+#if !defined SNTP_UPDATE_DELAY || defined __DOXYGEN__
+#define SNTP_UPDATE_DELAY           3600000
+#endif
+
+/** SNTP macro to get system time, used with SNTP_CHECK_RESPONSE >= 2
+ * to send in request and compare in response. Also used for round-trip
+ * delay compensation if SNTP_COMP_ROUNDTRIP != 0.
+ * Alternatively, define SNTP_GET_SYSTEM_TIME_NTP(sec, frac) in order to
+ * work with native NTP timestamps instead.
+ */
+#if !defined SNTP_GET_SYSTEM_TIME || defined __DOXYGEN__
+#define SNTP_GET_SYSTEM_TIME(sec, us)     do { (sec) = 0; (us) = 0; } while(0)
+#endif
+
+/** Default retry timeout (in milliseconds) if the response
+ * received is invalid.
+ * This is doubled with each retry until SNTP_RETRY_TIMEOUT_MAX is reached.
+ */
+#if !defined SNTP_RETRY_TIMEOUT || defined __DOXYGEN__
+#define SNTP_RETRY_TIMEOUT          SNTP_RECV_TIMEOUT
+#endif
+
+/** Maximum retry timeout (in milliseconds). */
+#if !defined SNTP_RETRY_TIMEOUT_MAX || defined __DOXYGEN__
+#define SNTP_RETRY_TIMEOUT_MAX      (SNTP_RETRY_TIMEOUT * 10)
+#endif
+
+/** Increase retry timeout with every retry sent
+ * Default is on to conform to RFC.
+ */
+#if !defined SNTP_RETRY_TIMEOUT_EXP || defined __DOXYGEN__
+#define SNTP_RETRY_TIMEOUT_EXP      1
+#endif
+
+/** Keep a reachability shift register per server
+ * Default is on to conform to RFC.
+ */
+#if !defined SNTP_MONITOR_SERVER_REACHABILITY || defined __DOXYGEN__
+#define SNTP_MONITOR_SERVER_REACHABILITY 1
+#endif
+
+/**
+ * @}
+ */
+
+#endif /* LWIP_HDR_APPS_SNTP_OPTS_H */
@@ -0,0 +1,106 @@
+/**
+ *
+ * @file tftp_opts.h
+ *
+ * @author   Logan Gunthorpe <logang@deltatee.com>
+ *
+ * @brief    Trivial File Transfer Protocol (RFC 1350) implementation options
+ *
+ * Copyright (c) Deltatee Enterprises Ltd. 2013
+ * All rights reserved.
+ *
+ */
+
+/* 
+ * Redistribution and use in source and binary forms, with or without
+ * modification,are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Logan Gunthorpe <logang@deltatee.com>
+ *
+ */
+
+#ifndef LWIP_HDR_APPS_TFTP_OPTS_H
+#define LWIP_HDR_APPS_TFTP_OPTS_H
+
+#include "lwip/opt.h"
+#include "lwip/prot/iana.h"
+
+/**
+ * @defgroup tftp_opts Options
+ * @ingroup tftp
+ * @{
+ */
+
+/**
+ * Enable TFTP debug messages
+ */
+#if !defined TFTP_DEBUG || defined __DOXYGEN__
+#define TFTP_DEBUG            LWIP_DBG_OFF
+#endif
+
+/**
+ * TFTP server port
+ */
+#if !defined TFTP_PORT || defined __DOXYGEN__
+#define TFTP_PORT             LWIP_IANA_PORT_TFTP
+#endif
+
+/**
+ * TFTP timeout
+ */
+#if !defined TFTP_TIMEOUT_MSECS || defined __DOXYGEN__
+#define TFTP_TIMEOUT_MSECS    10000
+#endif
+
+/**
+ * Max. number of retries when a file is read from server
+ */
+#if !defined TFTP_MAX_RETRIES || defined __DOXYGEN__
+#define TFTP_MAX_RETRIES      5
+#endif
+
+/**
+ * TFTP timer cyclic interval
+ */
+#if !defined TFTP_TIMER_MSECS || defined __DOXYGEN__
+#define TFTP_TIMER_MSECS      (TFTP_TIMEOUT_MSECS / 10)
+#endif
+
+/**
+ * Max. length of TFTP filename
+ */
+#if !defined TFTP_MAX_FILENAME_LEN || defined __DOXYGEN__
+#define TFTP_MAX_FILENAME_LEN 20
+#endif
+
+/**
+ * Max. length of TFTP mode
+ */
+#if !defined TFTP_MAX_MODE_LEN || defined __DOXYGEN__
+#define TFTP_MAX_MODE_LEN     7
+#endif
+
+/**
+ * @}
+ */
+
+#endif /* LWIP_HDR_APPS_TFTP_OPTS_H */
@@ -0,0 +1,95 @@
+/**
+ *
+ * @file tftp_server.h
+ *
+ * @author   Logan Gunthorpe <logang@deltatee.com>
+ *
+ * @brief    Trivial File Transfer Protocol (RFC 1350)
+ *
+ * Copyright (c) Deltatee Enterprises Ltd. 2013
+ * All rights reserved.
+ *
+ */
+
+/* 
+ * Redistribution and use in source and binary forms, with or without
+ * modification,are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Author: Logan Gunthorpe <logang@deltatee.com>
+ *
+ */
+
+#ifndef LWIP_HDR_APPS_TFTP_SERVER_H
+#define LWIP_HDR_APPS_TFTP_SERVER_H
+
+#include "lwip/apps/tftp_opts.h"
+#include "lwip/err.h"
+#include "lwip/pbuf.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** @ingroup tftp
+ * TFTP context containing callback functions for TFTP transfers
+ */
+struct tftp_context {
+  /**
+   * Open file for read/write.
+   * @param fname Filename
+   * @param mode Mode string from TFTP RFC 1350 (netascii, octet, mail)
+   * @param write Flag indicating read (0) or write (!= 0) access
+   * @returns File handle supplied to other functions
+   */
+  void* (*open)(const char* fname, const char* mode, u8_t write);
+  /**
+   * Close file handle
+   * @param handle File handle returned by open()
+   */
+  void (*close)(void* handle);
+  /**
+   * Read from file 
+   * @param handle File handle returned by open()
+   * @param buf Target buffer to copy read data to
+   * @param bytes Number of bytes to copy to buf
+   * @returns &gt;= 0: Success; &lt; 0: Error
+   */
+  int (*read)(void* handle, void* buf, int bytes);
+  /**
+   * Write to file
+   * @param handle File handle returned by open()
+   * @param pbuf PBUF adjusted such that payload pointer points
+   *             to the beginning of write data. In other words,
+   *             TFTP headers are stripped off.
+   * @returns &gt;= 0: Success; &lt; 0: Error
+   */
+  int (*write)(void* handle, struct pbuf* p);
+};
+
+err_t tftp_init(const struct tftp_context* ctx);
+void tftp_cleanup(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_APPS_TFTP_SERVER_H */
@@ -0,0 +1,393 @@
+/**
+ * @file
+ * Support for different processor and compiler architectures
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef LWIP_HDR_ARCH_H
+#define LWIP_HDR_ARCH_H
+
+#ifndef LITTLE_ENDIAN
+#define LITTLE_ENDIAN 1234
+#endif
+
+#ifndef BIG_ENDIAN
+#define BIG_ENDIAN 4321
+#endif
+
+#include "arch/cc.h"
+
+/**
+ * @defgroup compiler_abstraction Compiler/platform abstraction
+ * @ingroup sys_layer
+ * All defines related to this section must not be placed in lwipopts.h,
+ * but in arch/cc.h!
+ * If the compiler does not provide memset() this file must include a
+ * definition of it, or include a file which defines it.
+ * These options cannot be \#defined in lwipopts.h since they are not options
+ * of lwIP itself, but options of the lwIP port to your system.
+ * @{
+ */
+
+/** Define the byte order of the system.
+ * Needed for conversion of network data to host byte order.
+ * Allowed values: LITTLE_ENDIAN and BIG_ENDIAN
+ */
+#ifndef BYTE_ORDER
+#define BYTE_ORDER LITTLE_ENDIAN
+#endif
+
+/** Define random number generator function of your system */
+#ifdef __DOXYGEN__
+#define LWIP_RAND() ((u32_t)rand())
+#endif
+
+/** Platform specific diagnostic output.\n
+ * Note the default implementation pulls in printf, which may
+ * in turn pull in a lot of standard libary code. In resource-constrained 
+ * systems, this should be defined to something less resource-consuming.
+ */
+#ifndef LWIP_PLATFORM_DIAG
+#define LWIP_PLATFORM_DIAG(x) do {printf x;} while(0)
+#include <stdio.h>
+#include <stdlib.h>
+#endif
+
+/** Platform specific assertion handling.\n
+ * Note the default implementation pulls in printf, fflush and abort, which may
+ * in turn pull in a lot of standard libary code. In resource-constrained 
+ * systems, this should be defined to something less resource-consuming.
+ */
+#ifndef LWIP_PLATFORM_ASSERT
+#define LWIP_PLATFORM_ASSERT(x) do {printf("Assertion \"%s\" failed at line %d in %s\n", \
+                                     x, __LINE__, __FILE__); fflush(NULL); abort();} while(0)
+#include <stdio.h>
+#include <stdlib.h>
+#endif
+
+/** Define this to 1 in arch/cc.h of your port if you do not want to
+ * include stddef.h header to get size_t. You need to typedef size_t
+ * by yourself in this case.
+ */
+#ifndef LWIP_NO_STDDEF_H
+#define LWIP_NO_STDDEF_H 0
+#endif
+
+#if !LWIP_NO_STDDEF_H
+#include <stddef.h> /* for size_t */
+#endif
+
+/** Define this to 1 in arch/cc.h of your port if your compiler does not provide
+ * the stdint.h header. You need to typedef the generic types listed in
+ * lwip/arch.h yourself in this case (u8_t, u16_t...).
+ */
+#ifndef LWIP_NO_STDINT_H
+#define LWIP_NO_STDINT_H 0
+#endif
+
+/* Define generic types used in lwIP */
+#if !LWIP_NO_STDINT_H
+#include <stdint.h>
+/* stdint.h is C99 which should also provide support for 64-bit integers */
+#if !defined(LWIP_HAVE_INT64) && defined(UINT64_MAX)
+#define LWIP_HAVE_INT64 1
+#endif
+typedef uint8_t   u8_t;
+typedef int8_t    s8_t;
+typedef uint16_t  u16_t;
+typedef int16_t   s16_t;
+typedef uint32_t  u32_t;
+typedef int32_t   s32_t;
+#if LWIP_HAVE_INT64
+typedef uint64_t  u64_t;
+typedef int64_t   s64_t;
+#endif
+typedef uintptr_t mem_ptr_t;
+#endif
+
+/** Define this to 1 in arch/cc.h of your port if your compiler does not provide
+ * the inttypes.h header. You need to define the format strings listed in
+ * lwip/arch.h yourself in this case (X8_F, U16_F...).
+ */
+#ifndef LWIP_NO_INTTYPES_H
+#define LWIP_NO_INTTYPES_H 0
+#endif
+
+/* Define (sn)printf formatters for these lwIP types */
+#if !LWIP_NO_INTTYPES_H
+#include <inttypes.h>
+#ifndef X8_F
+#define X8_F  "02" PRIx8
+#endif
+#ifndef U16_F
+#define U16_F PRIu16
+#endif
+#ifndef S16_F
+#define S16_F PRId16
+#endif
+#ifndef X16_F
+#define X16_F PRIx16
+#endif
+#ifndef U32_F
+#define U32_F PRIu32
+#endif
+#ifndef S32_F
+#define S32_F PRId32
+#endif
+#ifndef X32_F
+#define X32_F PRIx32
+#endif
+#ifndef SZT_F
+#define SZT_F PRIuPTR
+#endif
+#endif
+
+/** Define this to 1 in arch/cc.h of your port if your compiler does not provide
+ * the limits.h header. You need to define the type limits yourself in this case
+ * (e.g. INT_MAX, SSIZE_MAX).
+ */
+#ifndef LWIP_NO_LIMITS_H
+#define LWIP_NO_LIMITS_H 0
+#endif
+
+/* Include limits.h? */
+#if !LWIP_NO_LIMITS_H
+#include <limits.h>
+#endif
+
+/* Do we need to define ssize_t? This is a compatibility hack:
+ * Unfortunately, this type seems to be unavailable on some systems (even if
+ * sys/types or unistd.h are available).
+ * Being like that, we define it to 'int' if SSIZE_MAX is not defined.
+ */
+#ifdef SSIZE_MAX
+/* If SSIZE_MAX is defined, unistd.h should provide the type as well */
+#ifndef LWIP_NO_UNISTD_H
+#define LWIP_NO_UNISTD_H 0
+#endif
+#if !LWIP_NO_UNISTD_H
+#include <unistd.h>
+#endif
+#else /* SSIZE_MAX */
+typedef int ssize_t;
+#define SSIZE_MAX INT_MAX
+#endif /* SSIZE_MAX */
+
+/* some maximum values needed in lwip code */
+#define LWIP_UINT32_MAX 0xffffffff
+
+/** Define this to 1 in arch/cc.h of your port if your compiler does not provide
+ * the ctype.h header. If ctype.h is available, a few character functions
+ * are mapped to the appropriate functions (lwip_islower, lwip_isdigit...), if
+ * not, a private implementation is provided.
+ */
+#ifndef LWIP_NO_CTYPE_H
+#define LWIP_NO_CTYPE_H 0
+#endif
+
+#if LWIP_NO_CTYPE_H
+#define lwip_in_range(c, lo, up)  ((u8_t)(c) >= (lo) && (u8_t)(c) <= (up))
+#define lwip_isdigit(c)           lwip_in_range((c), '0', '9')
+#define lwip_isxdigit(c)          (lwip_isdigit(c) || lwip_in_range((c), 'a', 'f') || lwip_in_range((c), 'A', 'F'))
+#define lwip_islower(c)           lwip_in_range((c), 'a', 'z')
+#define lwip_isspace(c)           ((c) == ' ' || (c) == '\f' || (c) == '\n' || (c) == '\r' || (c) == '\t' || (c) == '\v')
+#define lwip_isupper(c)           lwip_in_range((c), 'A', 'Z')
+#define lwip_tolower(c)           (lwip_isupper(c) ? (c) - 'A' + 'a' : c)
+#define lwip_toupper(c)           (lwip_islower(c) ? (c) - 'a' + 'A' : c)
+#else
+#include <ctype.h>
+#define lwip_isdigit(c)           isdigit((unsigned char)(c))
+#define lwip_isxdigit(c)          isxdigit((unsigned char)(c))
+#define lwip_islower(c)           islower((unsigned char)(c))
+#define lwip_isspace(c)           isspace((unsigned char)(c))
+#define lwip_isupper(c)           isupper((unsigned char)(c))
+#define lwip_tolower(c)           tolower((unsigned char)(c))
+#define lwip_toupper(c)           toupper((unsigned char)(c))
+#endif
+
+/** C++ const_cast<target_type>(val) equivalent to remove constness from a value (GCC -Wcast-qual) */
+#ifndef LWIP_CONST_CAST
+#define LWIP_CONST_CAST(target_type, val) ((target_type)((ptrdiff_t)val))
+#endif
+
+/** Get rid of alignment cast warnings (GCC -Wcast-align) */
+#ifndef LWIP_ALIGNMENT_CAST
+#define LWIP_ALIGNMENT_CAST(target_type, val) LWIP_CONST_CAST(target_type, val)
+#endif
+
+/** Get rid of warnings related to pointer-to-numeric and vice-versa casts,
+ * e.g. "conversion from 'u8_t' to 'void *' of greater size"
+ */
+#ifndef LWIP_PTR_NUMERIC_CAST
+#define LWIP_PTR_NUMERIC_CAST(target_type, val) LWIP_CONST_CAST(target_type, val)
+#endif
+
+/** Avoid warnings/errors related to implicitly casting away packed attributes by doing a explicit cast */
+#ifndef LWIP_PACKED_CAST
+#define LWIP_PACKED_CAST(target_type, val) LWIP_CONST_CAST(target_type, val)
+#endif
+
+/** Allocates a memory buffer of specified size that is of sufficient size to align
+ * its start address using LWIP_MEM_ALIGN.
+ * You can declare your own version here e.g. to enforce alignment without adding
+ * trailing padding bytes (see LWIP_MEM_ALIGN_BUFFER) or your own section placement
+ * requirements.\n
+ * e.g. if you use gcc and need 32 bit alignment:\n
+ * \#define LWIP_DECLARE_MEMORY_ALIGNED(variable_name, size) u8_t variable_name[size] \_\_attribute\_\_((aligned(4)))\n
+ * or more portable:\n
+ * \#define LWIP_DECLARE_MEMORY_ALIGNED(variable_name, size) u32_t variable_name[(size + sizeof(u32_t) - 1) / sizeof(u32_t)]
+ */
+#ifndef LWIP_DECLARE_MEMORY_ALIGNED
+#define LWIP_DECLARE_MEMORY_ALIGNED(variable_name, size) u8_t variable_name[LWIP_MEM_ALIGN_BUFFER(size)]
+#endif
+
+/** Calculate memory size for an aligned buffer - returns the next highest
+ * multiple of MEM_ALIGNMENT (e.g. LWIP_MEM_ALIGN_SIZE(3) and
+ * LWIP_MEM_ALIGN_SIZE(4) will both yield 4 for MEM_ALIGNMENT == 4).
+ */
+#ifndef LWIP_MEM_ALIGN_SIZE
+#define LWIP_MEM_ALIGN_SIZE(size) (((size) + MEM_ALIGNMENT - 1U) & ~(MEM_ALIGNMENT-1U))
+#endif
+
+/** Calculate safe memory size for an aligned buffer when using an unaligned
+ * type as storage. This includes a safety-margin on (MEM_ALIGNMENT - 1) at the
+ * start (e.g. if buffer is u8_t[] and actual data will be u32_t*)
+ */
+#ifndef LWIP_MEM_ALIGN_BUFFER
+#define LWIP_MEM_ALIGN_BUFFER(size) (((size) + MEM_ALIGNMENT - 1U))
+#endif
+
+/** Align a memory pointer to the alignment defined by MEM_ALIGNMENT
+ * so that ADDR % MEM_ALIGNMENT == 0
+ */
+#ifndef LWIP_MEM_ALIGN
+#define LWIP_MEM_ALIGN(addr) ((void *)(((mem_ptr_t)(addr) + MEM_ALIGNMENT - 1) & ~(mem_ptr_t)(MEM_ALIGNMENT-1)))
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Packed structs support.
+  * Placed BEFORE declaration of a packed struct.\n
+  * For examples of packed struct declarations, see include/lwip/prot/ subfolder.\n
+  * A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
+  */
+#ifndef PACK_STRUCT_BEGIN
+#define PACK_STRUCT_BEGIN
+#endif /* PACK_STRUCT_BEGIN */
+
+/** Packed structs support.
+  * Placed AFTER declaration of a packed struct.\n
+  * For examples of packed struct declarations, see include/lwip/prot/ subfolder.\n
+  * A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
+  */
+#ifndef PACK_STRUCT_END
+#define PACK_STRUCT_END
+#endif /* PACK_STRUCT_END */
+
+/** Packed structs support.
+  * Placed between end of declaration of a packed struct and trailing semicolon.\n
+  * For examples of packed struct declarations, see include/lwip/prot/ subfolder.\n
+  * A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
+  */
+#ifndef PACK_STRUCT_STRUCT
+#if defined(__GNUC__) || defined(__clang__)
+#define PACK_STRUCT_STRUCT __attribute__((packed))
+#else
+#define PACK_STRUCT_STRUCT
+#endif
+#endif /* PACK_STRUCT_STRUCT */
+
+/** Packed structs support.
+  * Wraps u32_t and u16_t members.\n
+  * For examples of packed struct declarations, see include/lwip/prot/ subfolder.\n
+  * A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
+  */
+#ifndef PACK_STRUCT_FIELD
+#define PACK_STRUCT_FIELD(x) x
+#endif /* PACK_STRUCT_FIELD */
+
+/** Packed structs support.
+  * Wraps u8_t members, where some compilers warn that packing is not necessary.\n
+  * For examples of packed struct declarations, see include/lwip/prot/ subfolder.\n
+  * A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
+  */
+#ifndef PACK_STRUCT_FLD_8
+#define PACK_STRUCT_FLD_8(x) PACK_STRUCT_FIELD(x)
+#endif /* PACK_STRUCT_FLD_8 */
+
+/** Packed structs support.
+  * Wraps members that are packed structs themselves, where some compilers warn that packing is not necessary.\n
+  * For examples of packed struct declarations, see include/lwip/prot/ subfolder.\n
+  * A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
+  */
+#ifndef PACK_STRUCT_FLD_S
+#define PACK_STRUCT_FLD_S(x) PACK_STRUCT_FIELD(x)
+#endif /* PACK_STRUCT_FLD_S */
+
+/** PACK_STRUCT_USE_INCLUDES==1: Packed structs support using \#include files before and after struct to be packed.\n
+ * The file included BEFORE the struct is "arch/bpstruct.h".\n
+ * The file included AFTER the struct is "arch/epstruct.h".\n
+ * This can be used to implement struct packing on MS Visual C compilers, see
+ * the Win32 port in the lwIP contrib repository for reference.
+ * For examples of packed struct declarations, see include/lwip/prot/ subfolder.\n
+ * A port to GCC/clang is included in lwIP, if you use these compilers there is nothing to do here.
+ */
+#ifdef __DOXYGEN__
+#define PACK_STRUCT_USE_INCLUDES
+#endif
+
+/** Eliminates compiler warning about unused arguments (GCC -Wextra -Wunused). */
+#ifndef LWIP_UNUSED_ARG
+#define LWIP_UNUSED_ARG(x) (void)x
+#endif /* LWIP_UNUSED_ARG */
+
+/** LWIP_PROVIDE_ERRNO==1: Let lwIP provide ERRNO values and the 'errno' variable.
+ * If this is disabled, cc.h must either define 'errno', include <errno.h>,
+ * define LWIP_ERRNO_STDINCLUDE to get <errno.h> included or
+ * define LWIP_ERRNO_INCLUDE to <errno.h> or equivalent.
+ */
+#if defined __DOXYGEN__
+#define LWIP_PROVIDE_ERRNO
+#endif
+
+/**
+ * @}
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_ARCH_H */
@@ -0,0 +1,99 @@
+/**
+ * @file
+ *
+ * AutoIP Automatic LinkLocal IP Configuration
+ */
+
+/*
+ *
+ * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Dominik Spies <kontakt@dspies.de>
+ *
+ * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
+ * with RFC 3927.
+ *
+ */
+
+#ifndef LWIP_HDR_AUTOIP_H
+#define LWIP_HDR_AUTOIP_H
+
+#include "lwip/opt.h"
+
+#if LWIP_IPV4 && LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/netif.h"
+/* #include "lwip/udp.h" */
+#include "lwip/etharp.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** AutoIP Timing */
+#define AUTOIP_TMR_INTERVAL      100
+#define AUTOIP_TICKS_PER_SECOND (1000 / AUTOIP_TMR_INTERVAL)
+
+/** AutoIP state information per netif */
+struct autoip
+{
+  /** the currently selected, probed, announced or used LL IP-Address */
+  ip4_addr_t llipaddr;
+  /** current AutoIP state machine state */
+  u8_t state;
+  /** sent number of probes or announces, dependent on state */
+  u8_t sent_num;
+  /** ticks to wait, tick is AUTOIP_TMR_INTERVAL long */
+  u16_t ttw;
+  /** ticks until a conflict can be solved by defending */
+  u8_t lastconflict;
+  /** total number of probed/used Link Local IP-Addresses */
+  u8_t tried_llipaddr;
+};
+
+
+void autoip_set_struct(struct netif *netif, struct autoip *autoip);
+/** Remove a struct autoip previously set to the netif using autoip_set_struct() */
+#define autoip_remove_struct(netif) do { (netif)->autoip = NULL; } while (0)
+err_t autoip_start(struct netif *netif);
+err_t autoip_stop(struct netif *netif);
+void autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr);
+void autoip_tmr(void);
+void autoip_network_changed(struct netif *netif);
+u8_t autoip_supplied_address(const struct netif *netif);
+
+/* for lwIP internal use by ip4.c */
+u8_t autoip_accept_packet(struct netif *netif, const ip4_addr_t *addr);
+
+#define netif_autoip_data(netif) ((struct autoip*)netif_get_client_data(netif, LWIP_NETIF_CLIENT_DATA_INDEX_AUTOIP))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_IPV4 && LWIP_AUTOIP */
+
+#endif /* LWIP_HDR_AUTOIP_H */
@@ -0,0 +1,161 @@
+/**
+ * @file
+ * Debug messages infrastructure
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef LWIP_HDR_DEBUG_H
+#define LWIP_HDR_DEBUG_H
+
+#include "lwip/arch.h"
+#include "lwip/opt.h"
+
+/**
+ * @defgroup debugging_levels LWIP_DBG_MIN_LEVEL and LWIP_DBG_TYPES_ON values
+ * @ingroup lwip_opts_debugmsg
+ * @{
+ */
+
+/** @name Debug level (LWIP_DBG_MIN_LEVEL)
+ * @{
+ */
+/** Debug level: ALL messages*/
+#define LWIP_DBG_LEVEL_ALL     0x00
+/** Debug level: Warnings. bad checksums, dropped packets, ... */
+#define LWIP_DBG_LEVEL_WARNING 0x01
+/** Debug level: Serious. memory allocation failures, ... */
+#define LWIP_DBG_LEVEL_SERIOUS 0x02
+/** Debug level: Severe */
+#define LWIP_DBG_LEVEL_SEVERE  0x03
+/**
+ * @}
+ */
+
+#define LWIP_DBG_MASK_LEVEL    0x03
+/* compatibility define only */
+#define LWIP_DBG_LEVEL_OFF     LWIP_DBG_LEVEL_ALL
+
+/** @name Enable/disable debug messages completely (LWIP_DBG_TYPES_ON)
+ * @{
+ */
+/** flag for LWIP_DEBUGF to enable that debug message */
+#define LWIP_DBG_ON            0x80U
+/** flag for LWIP_DEBUGF to disable that debug message */
+#define LWIP_DBG_OFF           0x00U
+/**
+ * @}
+ */
+
+/** @name Debug message types (LWIP_DBG_TYPES_ON)
+ * @{
+ */
+/** flag for LWIP_DEBUGF indicating a tracing message (to follow program flow) */
+#define LWIP_DBG_TRACE         0x40U
+/** flag for LWIP_DEBUGF indicating a state debug message (to follow module states) */
+#define LWIP_DBG_STATE         0x20U
+/** flag for LWIP_DEBUGF indicating newly added code, not thoroughly tested yet */
+#define LWIP_DBG_FRESH         0x10U
+/** flag for LWIP_DEBUGF to halt after printing this debug message */
+#define LWIP_DBG_HALT          0x08U
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @defgroup lwip_assertions Assertion handling
+ * @ingroup lwip_opts_debug
+ * @{
+ */
+/**
+ * LWIP_NOASSERT: Disable LWIP_ASSERT checks:
+ * To disable assertions define LWIP_NOASSERT in arch/cc.h.
+ */
+#ifdef __DOXYGEN__
+#define LWIP_NOASSERT
+#undef LWIP_NOASSERT
+#endif
+/**
+ * @}
+ */
+
+#ifndef LWIP_NOASSERT
+#define LWIP_ASSERT(message, assertion) do { if (!(assertion)) { \
+  LWIP_PLATFORM_ASSERT(message); }} while(0)
+#else  /* LWIP_NOASSERT */
+#define LWIP_ASSERT(message, assertion)
+#endif /* LWIP_NOASSERT */
+
+#ifndef LWIP_ERROR
+#ifndef LWIP_NOASSERT
+#define LWIP_PLATFORM_ERROR(message) LWIP_PLATFORM_ASSERT(message)
+#elif defined LWIP_DEBUG
+#define LWIP_PLATFORM_ERROR(message) LWIP_PLATFORM_DIAG((message))
+#else
+#define LWIP_PLATFORM_ERROR(message)
+#endif
+
+/* if "expression" isn't true, then print "message" and execute "handler" expression */
+#define LWIP_ERROR(message, expression, handler) do { if (!(expression)) { \
+  LWIP_PLATFORM_ERROR(message); handler;}} while(0)
+#endif /* LWIP_ERROR */
+
+/** Enable debug message printing, but only if debug message type is enabled
+ *  AND is of correct type AND is at least LWIP_DBG_LEVEL.
+ */
+#ifdef __DOXYGEN__
+#define LWIP_DEBUG
+#undef LWIP_DEBUG
+#endif
+
+#ifdef LWIP_DEBUG
+#define LWIP_DEBUGF(debug, message) do { \
+                               if ( \
+                                   ((debug) & LWIP_DBG_ON) && \
+                                   ((debug) & LWIP_DBG_TYPES_ON) && \
+                                   ((s16_t)((debug) & LWIP_DBG_MASK_LEVEL) >= LWIP_DBG_MIN_LEVEL)) { \
+                                 LWIP_PLATFORM_DIAG(message); \
+                                 if ((debug) & LWIP_DBG_HALT) { \
+                                   while(1); \
+                                 } \
+                               } \
+                             } while(0)
+
+#else  /* LWIP_DEBUG */
+#define LWIP_DEBUGF(debug, message)
+#endif /* LWIP_DEBUG */
+
+#endif /* LWIP_HDR_DEBUG_H */