//+------------------------------------------------------------------+
//| SocketDiag.mq5 — diagnostic: test MQL5 outbound sockets          |
//+------------------------------------------------------------------+
#property strict

void TestConnect(const string host, const int port)
  {
   PrintFormat("[SocketDiag] === test %s:%d ===", host, port);
   ResetLastError();
   int s = SocketCreate();
   PrintFormat("[SocketDiag] SocketCreate -> handle=%d GetLastError=%d", s, GetLastError());
   if(s == INVALID_HANDLE || s == 0)
      return;
   ResetLastError();
   bool ok = SocketConnect(s, host, port, 3000);
   PrintFormat("[SocketDiag] SocketConnect(%s,%d,3000) -> %s | GetLastError=%d",
               host, port, (ok ? "TRUE" : "FALSE"), GetLastError());
   PrintFormat("[SocketDiag] SocketIsConnected -> %s",
               (SocketIsConnected(s) ? "TRUE" : "FALSE"));
   if(ok)
     {
      string msg = "{\"action_type\":\"Heartbeat\",\"symbol\":\"MQL5_DIAG\"}\r\n";
      uchar buf[];
      int n = StringToCharArray(msg, buf, 0, WHOLE_ARRAY, CP_UTF8) - 1;
      ResetLastError();
      int sent = SocketSend(s, buf, n);
      PrintFormat("[SocketDiag] SocketSend -> %d bytes | GetLastError=%d", sent, GetLastError());
     }
   SocketClose(s);
   Print("[SocketDiag] === done ===");
  }

void OnStart()
  {
   Print("[SocketDiag] MQL5 outbound socket diagnostics");
   TestConnect("127.0.0.1", 5555);      // Centaur router (listening)
   TestConnect("127.0.0.1", 22346);     // MCP server (listening)
   TestConnect("127.0.0.1", 59999);     // closed port (comparison)
  }