node udp echo server

package.json

{
  "name": "service-discovery",
  "version": "1.0.0",
  "description": "",
  "main": "udp-server.js",
  "dependencies": {
    "broadcast-address": "^1.0.2",
    "dgram": "^1.0.1",
    "dotenv": "^8.2.0"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "install-service": "cp discovery-server.service /etc/systemd/system/discovery-server.service"
  },
  "author": "",
  "license": "ISC"
}

udp-client.js

//npm install broadcast-address
//npm install dgram
//npm install dotenv

var udp = require('dgram');
var buffer = require('buffer');
const os = require('os');
const broadcastAddress = require('broadcast-address');

var serverPort = process.env.UDP_ECHO_SERVER_PORT || 3192;
var client = udp.createSocket('udp4');
var data = Buffer.from('siddheshrane');

client.on('message', function(msg, info) {
    console.log('Got response from %s:%d', info.address, info.port);
    console.log('Pi ip address is %s', info.address);
    console.log('');
});

client.bind(2221, undefined, function() {
    client.setBroadcast(true);
});

var interfaces = os.networkInterfaces();
var interfacesNames = Object.keys(interfaces);

interfacesNames.forEach(function(interfacesName) {
    var interfaceItem = interfaces[interfacesName];
    interfaceItem.forEach(function(interfaceAddress) {
        if (interfaceAddress.family === 'IPv4') {
            client.send(data, serverPort, broadcastAddress(interfacesName), function(error) {
                if (error) {
                    client.close();
                } else {
                    console.log('Send request from ' + interfacesName + ' ' + interfaceAddress.address);
                }
            })
        }
    })
});

udp-server.js

//npm install dgram
//npm install dotenv

const dotenv = require('dotenv');
dotenv.config();

var port = process.env.UDP_ECHO_SERVER_PORT || 3192;

var udp = require('dgram');
var server = udp.createSocket('udp4');
server.on('error', function(error) {
    console.log('Error: ' + error);
    server.close();
});

server.on('message', function(msg, info) {
    console.log('Got message from %s:%d',info.address, info.port);
    server.send(msg, info.port, info.address, function(error) {
        if (error) {
            client.close();
        }
    });
});
server.on('listening', function() {
    var address = server.address();
    var port = address.port;
    var family = address.family;
    var ipaddr = address.address;
    console.log('Server is listening at port' + port);
    console.log('Server ip :' + ipaddr);
    console.log('Server is IP4/IP6 : ' + family);
});

//emits after the socket is closed using socket.close();
server.on('close', function() {
    console.log('Socket is closed !');
});

server.bind(port);