tcp/client-server

31.js

var net = require('net');
var sock;
var port = 8089;

if(process.argv[2] === 'client') {

  sock = new net.Socket();
  sock.meta = 'foobar';

  sock.on('data', function(data) {
    console.log(String(data));
  });

  sock.connect(port);

  sock.write('ping');
}

if(process.argv[2] === 'server') {

  sock = new net.Server();
  sock.listen(port);

  sock.on('connection', function(socket) {

    socket.on('data', function(data) {

      console.log(String(data));
      socket.write('pong');
    });
  });
}