stream work fine for the first time but then stops - flutter

Question

Future<bool> connectServer(BuildContext context) async {
try {
// await _displayTextInputDialog(context);
// socket = await Socket.connect(_textFieldController.text, 2508,
// timeout: const Duration(seconds: 4));
socket = await Socket.connect("192.168.14.148", 2508,
timeout: const Duration(seconds: 4));
stream = socket.listen(null);
return true;
} on SocketException {
await Navigator.pushNamed(
context,
'/connectionE',
);
return false;
}
}
Future<dynamic> receiveMessage() {
final completer = Completer();
print("before");
stream.onData((data) {
print(data);
if (data.contains(49)) {
print(data);
completer.complete(extractData(data));
stream.cancel();
}
});
print('after');
return completer.future;
}
Future<String> sendAndWait(
BuildContext context, String message, int code) async {
try {
sendMessage(message, code);
print("sended");
String reply = await receiveMessage();
stream.onData((data) {});
print(reply);
return "";
} on SocketException {
Navigator.pushReplacementNamed(
context,
'/serverDownE',
);
}
return "2";
}
receiveMessage work on the first time, but then stop working, it doesn't even get into the onData function. Does someone know why is this happening? I cant use cancel on the subscription, cancel and start new one because when I start listening again I get an error Bad state stream has already been listening. I can't close the socket because the the server is a stateful server.