server.js

var express = require('express')
  , app = express()
  , server = require('http').createServer(app)
  , io = require('socket.io').listen(server);

io.set('log level', 0);
io.configure(function () { 
  io.set("transports", ["xhr-polling"]); 
  io.set("polling duration", 10); 
});

app.set('views', __dirname + '/views');
app.use(express.static(__dirname + '/static'));

app.get('/', function(req, res){
    res.render('index.jade');
});
app.get('/mobile/:id', function(req, res){
    res.render('mobile.jade', {id: req.params.id});
});

server.listen(process.env.PORT || 8080);

var regUsers = {};

io.sockets.on('connection', function(socket) {
    var deskSocket;
    var mobileSocket

    socket.on('desktop-register', function(data) {
        regUsers[data.id] = deskSocket = socket;
    });

    
    socket.on('mobile-register', function(data) {
        mobileSocket = socket;

        if(typeof(regUsers[data.id]) !== "undefined") {
            deskSocket = regUsers[data.id];
            
            deskSocket.emit('mobile-on');
            mobileSocket.emit('start');
        }
    });

    socket.on('mobile-orientation', function(orientation) {
        if(typeof(deskSocket) !== "undefined" && deskSocket !== null) {
            deskSocket.emit('orientation', orientation);
        }
    });
});