testdgram.js

'use strict';

var Promise = require('bluebird');
var promiseDoWhilst = require('promise-do-whilst');
var dgram = require('dgram');
var ANNOUNCEMENT_PORT = 43662;
var SUBNET_BROADCAST_ADDRESS = '192.168.1.255';
function sendDatagram(){ 
        let message = new Buffer(JSON.stringify(messageJson));
        var client;
        return Promise.try(() => {
          return new Promise((resolve, reject) => {
            client = dgram.createSocket("udp4", (error) => {
              if (error) {
                console.log(`Warn: Create Socket Failed: ${error.message}`);
                reject(error);
                return;
              }
              resolve();
            });
          });
        }).then(() => {
          console.log(`Info: Socket created`);
          client.setBroadcast(true);
        }).then(() => {
          console.log(`Info: Broadcast set to true`);
          return new Promise((resolve, reject) => {
            client.send(message, 0, message.length, ANNOUNCEMENT_PORT, SUBNET_BROADCAST_ADDRESS, (error) => {
              if(error){
                reject(error);
                return;
              }
              resolve();
            });
          });
        }).then(() => {
          console.log(`Info: Message Sent: `, message.toString());
          return new Promise((resolve, reject) => {
            client.close(() => {
              resolve();
            });
          })
        }).catch((error) => {
          if(client){
            client.close();
          }
          console.log(`Warn: Announce failed: ${error.message}, ${error.stack}`);
        })
}

promiseDoWhilst(() => {
  return sendDatagram().delay(10000);
}, () => {return true;}).catch((error) => {
  console.log(error);
});