fix: harden tcp bridge reconnect handling

App/tcp_server.c

@@ -8,6 +8,8 @@
 #include "lwip/pbuf.h"
 #include "lwip/tcp.h"
 
+#include "SEGGER_RTT.h"
+
 #include <string.h>
 
 typedef struct {
@@ -49,6 +51,7 @@ static err_t tcp_server_on_recv(void *arg, struct tcp_pcb *pcb, struct pbuf *p,
         }
         ctx->client_pcb = NULL;
         ctx->status.state = TCP_SERVER_STATE_LISTENING;
+        SEGGER_RTT_WriteString(0, "TCP server peer disconnected\r\n");
         return ERR_OK;
     }
 
@@ -85,6 +88,7 @@ static void tcp_server_on_err(void *arg, err_t err)
     ctx->client_pcb = NULL;
     ctx->status.state = TCP_SERVER_STATE_LISTENING;
     ctx->status.errors++;
+    SEGGER_RTT_printf(0, "TCP server connection error=%d\r\n", (int)err);
 }
 
 static err_t tcp_server_on_accept(void *arg, struct tcp_pcb *newpcb, err_t err)
@@ -103,6 +107,7 @@ static err_t tcp_server_on_accept(void *arg, struct tcp_pcb *newpcb, err_t err)
     ctx->client_pcb = newpcb;
     ctx->status.state = TCP_SERVER_STATE_CONNECTED;
     ctx->status.connections++;
+    SEGGER_RTT_WriteString(0, "TCP server client connected\r\n");
 
     tcp_nagle_disable(newpcb);
 
@@ -158,6 +163,7 @@ int tcp_server_start(void)
     tcp_arg(g_server.listen_pcb, &g_server);
     tcp_accept(g_server.listen_pcb, tcp_server_on_accept);
     g_server.status.state = TCP_SERVER_STATE_LISTENING;
+    SEGGER_RTT_printf(0, "TCP server listening on %u\r\n", g_server.config.port);
     return 0;
 }