etcp: per-link acked bytes/packets counters + BBR debug logging

- Add acked_bytes/acked_packets to struct ETCP_LINK (init, reset, increment per ACK)
- Add DEBUG_CATEGORY_BBR (23) for BBR-specific debug output
- Add BBR input/output DEBUG_DEBUG around bbr_main call in etcp_ack_recv
- Add "bbr" category name to debug_config and etcpmon GUI

lib/debug_config.c

@@ -127,6 +127,7 @@ static const struct {
     {"nat", DEBUG_CATEGORY_NAT},
     {"keepalive", DEBUG_CATEGORY_KEEPALIVE},
     {"etcp_route", DEBUG_CATEGORY_ETCPROUTE},
+    {"bbr", DEBUG_CATEGORY_BBR},
     {"all", DEBUG_CATEGORY_ALL},
     {NULL, DEBUG_CATEGORY_NONE}
 };

lib/debug_config.h

@@ -60,7 +60,8 @@ typedef int debug_category_t;
 #define DEBUG_CATEGORY_NAT         20  // EIM NAT module
 #define DEBUG_CATEGORY_KEEPALIVE   21  // Link keepalive logic
 #define DEBUG_CATEGORY_ETCPROUTE   22  // ETCP routing
-#define DEBUG_CATEGORY_COUNT       23  // Total number of categories
+#define DEBUG_CATEGORY_BBR         23  // BBR congestion control
+#define DEBUG_CATEGORY_COUNT       24  // Total number of categories
 #define DEBUG_CATEGORY_ALL         (-1) // special value for all categories
 
 /* Debug configuration structure */

src/etcp.c

@@ -394,6 +394,8 @@ void etcp_conn_reset(struct ETCP_CONN* etcp) {
         l->inflight_bytes = 0;
         l->inflight_packets = 0;
         l->delivered_bytes = 0;
+        l->acked_bytes = 0;
+        l->acked_packets = 0;
         l->last_ack_time_tb = get_time_tb();
         l = l->next;
     }
@@ -1243,14 +1245,28 @@ void etcp_ack_recv(struct ETCP_CONN* etcp, uint32_t seq, uint16_t ts, uint16_t d
             link->delivered_bytes += rs.delivered;
             link->last_ack_time_tb = now_tb;
 
-            uint32_t new_cwnd = link->inflight_lim_bytes;
-            uint32_t new_pacing = link->bbr_pacing_rate;
+            DEBUG_DEBUG(DEBUG_CATEGORY_BBR, "[L%u] BBR in: seq=%u del=%u iv=%uus rtt=%uus pri=%u infl=%u lost=%d app=%d cwnd=%u",
+                link->local_link_id, seq, rs.delivered, rs.interval_us, rs.rtt_us,
+                rs.prior_delivered, rs.tx_in_flight, rs.lost, rs.is_app_limited,
+                link->inflight_lim_bytes);
+
+            uint32_t old_cwnd = link->inflight_lim_bytes;
+            uint32_t old_pacing = link->bbr_pacing_rate;
+            uint32_t new_cwnd = old_cwnd;
+            uint32_t new_pacing = old_pacing;
             bbr_main(link->bbr, &rs, &new_cwnd, &new_pacing, link->mtu, link->inflight_bytes,
                      (link->inflight_bytes >= link->inflight_lim_bytes));
             etcp_link_update_inflight_lim(link, new_cwnd);
             link->bbr_pacing_rate    = new_pacing;
             link->bandwidth          = (uint32_t)((uint64_t)new_pacing * 8 / 1000);
             link->bbr_loss_since_ack = 0;
+
+            DEBUG_DEBUG(DEBUG_CATEGORY_BBR, "[L%u] BBR out: cwnd %u→%u pace %u→%u bw=%uK mode=%d cyc=%d infl=%u",
+                link->local_link_id, old_cwnd, new_cwnd, old_pacing, new_pacing,
+                link->bandwidth, link->bbr->mode, link->bbr->cycle_idx, link->inflight_bytes);
+
+            link->acked_bytes   += acked_pkt->ll.len;
+            link->acked_packets++;
     }
 
 

src/etcp_connections.c

@@ -795,6 +795,8 @@ struct ETCP_LINK* etcp_link_new(struct ETCP_CONN* etcp, struct ETCP_SOCKET* conn
     link->burst_target_bdp = 0;
 
     link->delivered_bytes = 0;
+    link->acked_bytes = 0;
+    link->acked_packets = 0;
     link->last_ack_time_tb = get_time_tb();
     link->bbr_pacing_rate = 0;
     link->bbr_loss_since_ack = 0;

src/etcp_connections.h

@@ -182,6 +182,8 @@ struct ETCP_LINK {
     size_t total_encrypted;
     size_t total_decrypted;
     uint32_t total_retransmissions;
+    uint64_t acked_bytes;               // подтверждённых байт на этом линке
+    uint64_t acked_packets;             // подтверждённых пакетов на этом линке
     
     uint16_t rtt_last;                 // round trip (время отправки + приёма)
     uint32_t jitter;                   // Current jitter [>>16] x0.1 ms

tools/etcpmon/etcpmon_gui.c

@@ -750,7 +750,7 @@ static void CreateControls(struct etcpmon_app* app) {
             "UASYNC","LL_QUEUE","CONNECTION","ETCP","CRYPTO",
             "MEMORY","TIMING","CONFIG","TUN","ROUTING",
             "TIMERS","NORMALIZER","BGP","SOCKET","CONTROL",
-            "DUMP","TRAFFIC","DEBUG_CAT","GENERAL","NAT","KEEPALIVE","ETCPROUTE"
+            "DUMP","TRAFFIC","DEBUG_CAT","GENERAL","NAT","KEEPALIVE","ETCPROUTE","BBR"
         };
         int ncat = sizeof(cat_names) / sizeof(cat_names[0]);
         app->debug_cat_count = ncat;