koajs + socket.io server side example

app.js

const Koa = require('koa');

const app = new Koa();

const server = require('http').createServer(app.callback());

const io = require('socket.io')(server, {path: '/remote-control-sockjs'});

const port = process.env.PORT || 8080;

server.listen(port);

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

    socket.on('slide-change', function (detail) {

        console.log(detail);

        io.emit('slide-change', detail);
    });

});

console.log('koa app running on http://localhost:' + port);