etcp_connections: force reinit when client sends ETCP_INIT_REQUEST (reset)

Server now checks both code==ETCP_INIT_REQUEST and session_id mismatch
to decide send_reset. Previously only session_id was checked, so if
session matched (both sides had 00000000), reinit was skipped even
when client explicitly requested reset (code 0x02).

Client side already correct: handle_init_response_client:1473 calls
etcp_conn_reinit if pkt_code==ETCP_INIT_RESPONSE (0x03).

src/etcp_connections.c

@@ -1727,14 +1727,14 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
         // For CHANNEL_INIT (0x04): if link already initialized - no reset, otherwise reset
         // For INIT_REQUEST (0x02): always reset
         // Check session_id: if same - no reinit, if different - client restarted, do reinit
-        if (conn->session_id == session_id) {
-            send_reset = 0;  // Same session, no reinit needed
-            DEBUG_TRACE(DEBUG_CATEGORY_CONNECTION, "same session_id, skip reinit");
-        } else {
-            send_reset = 1;  // New session or uninitialized link - send reset
-            DEBUG_TRACE(DEBUG_CATEGORY_CONNECTION, "new session_id %08x (was %08x), do reinit", session_id, conn->session_id);
+        if (code == ETCP_INIT_REQUEST || conn->session_id != session_id) {
+            send_reset = 1;  // Client explicitly requested reset, or new session
+            DEBUG_TRACE(DEBUG_CATEGORY_CONNECTION, "do reinit (code=%02x session was %08x now %08x)", code, conn->session_id, session_id);
             conn->session_id = session_id;
             etcp_conn_reinit(conn);
+        } else {
+            send_reset = 0;  // Same session, no reinit needed
+            DEBUG_TRACE(DEBUG_CATEGORY_CONNECTION, "same session_id, skip reinit");
         }
 
         // Cancel existing timers
@@ -1752,10 +1752,10 @@ void etcp_connections_read_callback_socket(socket_t sock, void* arg) {
         link->remote_only_local = req->only_local;
         link->remote_type = req->type;
 
-        // For new links: check session_id to avoid false reinit
-        if (conn->session_id != session_id) {
-            send_reset = 1;  // New session or uninitialized link - send reset
-            DEBUG_TRACE(DEBUG_CATEGORY_CONNECTION, "new session_id %08x (was %08x) for new link, do reinit", session_id, conn->session_id);
+        // For new links: reset if client requested or session changed
+        if (code == ETCP_INIT_REQUEST || conn->session_id != session_id) {
+            send_reset = 1;
+            DEBUG_TRACE(DEBUG_CATEGORY_CONNECTION, "do reinit for new link (code=%02x session was %08x now %08x)", code, conn->session_id, session_id);
             conn->session_id = session_id;
             etcp_conn_reinit(conn);
         }