dart Socket and ServerSocket

ServerSocket

void main() async {
  ServerSocket serverSocket = await ServerSocket.bind("localhost", 8888);
  serverSocket.listen((Socket client) {
    client.write("ok");
    client.close();
  });
}

Socket

Future<void> main() async {
  Socket socket = await Socket.connect("localhost", 8888);
  socket.listen((data) {
    print(String.fromCharCodes(data));
  }, onDone: (){
    socket.destroy();
  });
}