gistfile1.dart

import 'dart:io';

int PORT = 5555;

void testconnect(){
  print("testconnect");
  Socket.connect("localhost", PORT).then((Socket sock){
      sock.add("hello".codeUnits);
  });
}

void testlisten(){
  ServerSocket.bind("localhost", PORT).then((ServerSocket socket) {
    socket.listen((Socket clientSocket) {
      print("new client");
      clientSocket.listen((data) => clientSocket.add(data) //echo data back 
          ,onDone:()=> print("close client") );  
    });
  });
}

main() {
  testlisten();
  testconnect();
}