Engine.io and server Client.io

client.js

// Install with 'npm install engine.io-client'
// Run in node.js as a client! (Not browser-only!)

/* Socket client */

var eio = require('engine.io-client');

var socket = new eio.Socket({ host: 'localhost', port: 8080 });

socket.onopen = function () {
	socket.onmessage = function (data) {
		console.log( JSON.parse(data.data) );
	};

	socket.onclose = function () {

	};
};

server.js

//Install with 'npm install engine.io'

/* Socket server */

var engine = require('engine.io')
  , server = engine.listen(8080)

// Send message to everyone but (optionally) the sending client
server.broadcast = function(mssg, id) {

	for( var key in server.clients ) {

		if(typeof id !== 'undefined') {

			// Don't broadcast to sending client
			if( key == id ) {
				continue;
			}

		}

		server.clients[key].send(mssg);

	}

}

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

	// Broadcast a to other cients
	server.broadcast( JSON.stringify({resp:'New Client!'}), socket.id);

});