atom-remote-server.js

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);

app.get('/', function(req, res){
  res.send('<h1>Hello world</h1>');
});

io.on('connection', function(socket){
  console.log('a user connected');
  socket.on('change', function(msg){
    console.log('patch: ', msg);
    socket.broadcast.emit('change', msg)
  });
  socket.on('disconnect', function () {
    io.sockets.emit('user disconnected');
  });
});

http.listen(3000, function(){
  console.log('listening on *:3000');
});