gistfile1.js

var app                 = require('express')();
var http                = require('http');
var server              = http.createServer(app);
var io                  = require('socket.io').listen(server, { log: false })
app.post('/door-open', function (req, res) {

});

app.post('/detect', function (req, res) {
});

io.on('connection',function(socket){
    currentSocket = socket;
});

io.on('disconnect',function(socket){
    currentSocket = null;
});