simple-udp.js

'use strict';

const os = require('os');
const dgram = require('dgram');
const server = dgram.createSocket('udp4');

const sep = '\n' + Array(80).join('-') + '\n';
console.log(sep, os.networkInterfaces(), sep);

server.on('error', err => {
  console.log(`server error:\n${err.stack}`);
  server.close();
});

server.on('message', (msg, rinfo) => {
  console.log(`msg: ${msg}`);
  console.log(`from: ${rinfo.address}:${rinfo.port}`);
  console.log('length', msg.length);
  console.log('==================================================');
});

server.on('listening', () => {
  var address = server.address();
  console.log(sep, `server listening ${address.address}:${address.port}`, sep);
});

const PORT = process.env.PORT || 33333;

server.bind(PORT);