true_socket_listener.dart

import 'dart:io';
import 'dart:async';

final int port = 5000;
final String address = "127.0.0.1";

void main() {
  Future<ServerSocket> serverFuture = ServerSocket.bind(address, port);
  serverFuture.then((ServerSocket server) {
    print('listening for connections on ' + server.port.toString());
    server.listen((Socket socket) {  
      socket.listen((List<int> data) {
        String cls = "Hi, I'm darty, your friendly little server";
        socket.write(cls);
        socket.close();
      });
    });
  });
}