Node Server for reading and emitting UDP Datagrams from server to client with Socket.IO

Example UDP Node Server.js

///////////////////////////////////////////////////INITIALIZE VARIABLES
var express = require('express')
const url = require('url');
var app = express()
var $ = require('jquery');
var dgram = require('dgram');
var udpServer = dgram.createSocket('udp4');
var PORT = 41234;
var HOST = '127.0.0.1';
var SerialPort = require("serialport");
var path = require('path');
var server = require('http').createServer(app);
var io = require('socket.io')(server, { wsEngine: 'ws' });
var port = process.env.PORT || 3000;
var lastPosition;
var lastDirection;
///////////////////////////////////////////////////INITIALIZE VARIABLES

///////////////////////////////////////////////////SEND DATA TO CLIENT SIDE
udpServer.on('error', (err) => {
  console.log('server error');
});

udpServer.on('message', (msg, rinfo) => {
    //This example is for an RLS rotary encoder
    var encoderData = msg.toString();
    var splitEncoderData = encoderData.split(':',3);
    var position = splitEncoderData[0];
    var direction = position - lastPosition;
    var speed = Math.abs((direction > 20) ? 20 : direction);
    lastPosition = position; // update last position (after using current position)
    lastDirection = directionq; // update last direction
    io.sockets.emit('position', position, speed, direction);
});

udpServer.bind(PORT, HOST);
///////////////////////////////////////////////////SEND DATA TO CLIENT SIDE


///////////////////////////////////////////////////PAGE RENDERING
app.use(express.static(__dirname + '/Views'));

server.listen(3000, function listening() {
  console.log('Listening on %d', server.address().port);
});

app.get('/', function (req, res) {
  res.sendFile('index.html');
})
//////////////////////////////////////////////////PAGE RENDERING