server.js

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

const hostname = '192.168.56.1';
const port = 3001;

app.get('/', (req, res) =>{
  res.sendFile(__dirname+'/server.html');
});

io.on('connection', function(socket){
  //just testing 
    console.log('a user connected');
    
    //just testing 
    socket.on('disconnect', function(){
        console.log('user disconnected');
      });

});

http.listen(port, hostname, () =>{
    console.log(`Server running at http://${hostname}:${port}/`);
});