Flutter - Socket connection keep timed out and reconnecting by itself

The native socket server is fine. I've connected to it from other clients as well without any issues, even managed to transmit messages between clients.

And then I need to do the same from Flutter. I tried socket_io_client.

  Socket socket = io('http://192.168.1.2:5000', <String, dynamic>{
    'autoconnect' : false,
  });
  socket.onAny((String event, data){
    print([event, data]);
  });
  socket.connect();

Sadly socket.onAny heard nothing except timeout error with the event named connect_error. From server log, the client was shown as repeatedly connected to the server with new port number everytime, but without any signal of disconnection. I don't know how to keep it from timeout and even autoconnect : false setting was ignored.

UPDATE

Instead of fixing the car, I throw away the car into the cliff and buy a new car. I use flutter_io_socket instead.

  Socket socket = io('http://192.168.1.2:5000', <String, dynamic>{
    'autoconnect' : false,
  });
  socket.onConnect((p) => print(['CONNECT', p]));
  socket.onDisconnect((p) => print(['DISCONNECT', p]));
  socket.onError((p) => print(['ERROR', p]));
  socket.onConnecting((p) => print(['CONNECTING', p]));
  socket.onConnectError((p) => print(['CONNECT ERROR', p]));
  socket.onConnectTimeout((p) => print(['TIMEOUT', p]));
  socket.on('connect_error', (p) => print(['CONNECT ERROR', p]));
  socket.connect();

And now I got clearer vision.

I/flutter (28975): attempting reconnect

I/flutter (28975): readyState closed

I/flutter (28975): opening http://192.168.1:2:5000

I/flutter (28975): creating transport "polling"

I/flutter (28975): setting transport websocket

I/flutter (28975): connect attempt will timeout after 20000

I/flutter (28975): connect attempt timed out after 20000

I/flutter (28975): socket close with reason: "forced close"

I/flutter (28975): socket closing - telling transport to close

I/flutter (28975): connect_error I/flutter (28975): cleanup

I/flutter (28975): [CONNECT ERROR, timeout]

I/flutter (28975): reconnect attempt error

I/flutter (28975): will wait %dms before reconnect attempt 5000

I/flutter (28975): [TIMEOUT, 20000]

Yes. Except for onError, onConnectError, and on('connect_error', other listeners heard nothing.

Greatly appreciate the help thank you.