Udp socket in Flutter does not receive anything - sockets

Question

I'm trying to use a udp socket as server in Flutter. I'd like to bind this socket on my localhost at 6868 port always in listening. Unfortunately when i try to send something from a client,it never prints the string "RECEIVED".
Here's the code:
static Future openPortUdp(Share share) async {
await RawDatagramSocket.bind(InternetAddress.anyIPv4,6868)
.then(
(RawDatagramSocket udpSocket) {
udpSocket.listen((e) {
switch (e) {
case RawSocketEvent.read:
print("RECEIVED");
print(String.fromCharCodes(udpSocket.receive().data));
break;
case RawSocketEvent.readClosed:
print("READCLOSED");
break;
case RawSocketEvent.closed:
print("CLOSED");
break;
}
});
},
);
}
Am I doing something wrong?
Anyway this is the client side, it is written is Lua:
local udp1 = socket.udp()
while true do
udp1:setpeername("192.168.1.24", 6868)
udp1:send("HI")
local data1 = udp1:receive()
if (not data1 == nil) then print(data1) break end
udp1:close()
end
I tested it with another server and it works well, so i don't think the client is the problem.
Thanks!

Answer 1

If it can help you, here my code for my SocketUDP (as singleton) in my app.
I used it in localhost and it works very well :
class SocketUDP {
RawDatagramSocket _socket;
// the port used by this socket
int _port;
// emit event when receive a new request. Emit the request
StreamController<Request> _onRequestReceivedCtrl = StreamController<Request>.broadcast();
// to give access of the Stream to listen when new request is received
Stream<Request> get onRequestReceived => _onRequestReceivedCtrl.stream;
// as singleton to maintain the connexion during the app life and be accessible everywhere
static final SocketUDP _instance = SocketUDP._internal();
factory SocketUDP() {
return _instance;
}
SocketUDP._internal();
void startSocket(int port) {
_port = port;
RawDatagramSocket.bind(InternetAddress.anyIPv4, _port)
.then((RawDatagramSocket socket) {
_socket = socket;
// listen the request from server
_socket.listen((e) {
Datagram dg = _socket.receive();
if (dg != null) {
_onRequestReceivedCtrl.add(RequestConvert.decodeRequest(dg.data, dg.address));
}
});
});
}
void send(Request requestToSend, {bool isBroadCast:false}) {
_socket.broadcastEnabled = isBroadCast;
final String requestEncoded = RequestConvert.encodeRequest(requestToSend);
List<int> requestAsUTF8 = utf8.encode(requestEncoded);
_socket.send(requestAsUTF8, requestToSend.address, _port);
}
}