mafalda-api/services/sockets.js

const server = require('http').createServer();
const io = require('socket.io')(server, {
  path: '/sockets',
  serveClient: false,
  // below are engine.IO options
  pingInterval: 10000,
  pingTimeout: 5000,
  cookie: false
});
server.listen(3555);

module.exports = io;