send heartbeat message to udp server by nodejs

udpClient.js

var dgram = require('dgram');
var message = new Buffer("Hello World");
var server_ip = 'localhost';
var server_port = 3000;
var beat_period = 5;
console.log("Sending heartbeat to IP " + server_ip + " , port " + server_port);
var client = dgram.createSocket("udp4");
console.log("press Ctrl-C to stop");
setInterval(function() {
    client.send(message, 0, message.length, server_port, server_ip);
}, beat_period * 1000);