socket.io server side example

app.js

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

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);

    });

});