feature to send image from tcp connection

tcp_debug.cpp

@@ -8,7 +8,7 @@
 
 #define TCP_PORT 4242
 #define DEBUG_BUF_SIZE 2048
-#define TCP_IN_BUF_SIZE 128
+#define TCP_IN_BUF_SIZE 20000 // Increased to hold full image + commands
 
 // Circular buffer for debug output
 static char debug_buf[DEBUG_BUF_SIZE];
@@ -97,11 +97,18 @@ static err_t tcp_server_poll(void *arg, struct tcp_pcb *tpcb) {
     return ERR_OK;
 }
 
+static tcp_connection_callback_t g_conn_callback = NULL;
+
+void tcp_set_connection_callback(tcp_connection_callback_t callback) {
+    g_conn_callback = callback;
+}
+
 static err_t tcp_server_recv(void *arg, struct tcp_pcb *tpcb, struct pbuf *p, err_t err) {
     if (!p) {
         tcp_close(tpcb);
         client_pcb = NULL;
         printf("TCP debug client disconnected\n");
+        if (g_conn_callback) g_conn_callback(false);
         return ERR_OK;
     }
     
@@ -133,6 +140,7 @@ static err_t tcp_server_accept(void *arg, struct tcp_pcb *newpcb, err_t err) {
         // Already have a client, reject or close old?
         // Let's close the old one and accept the new one (last one wins)
         tcp_abort(client_pcb);
+        if (g_conn_callback) g_conn_callback(false);
     }
     
     client_pcb = newpcb;
@@ -144,6 +152,7 @@ static err_t tcp_server_accept(void *arg, struct tcp_pcb *newpcb, err_t err) {
     // However, we can also trigger writes from the main loop if we wanted, but polling is safer for threading.
     
     printf("TCP debug client connected\n");
+    if (g_conn_callback) g_conn_callback(true);
     return ERR_OK;
 }