text: var dgram = require('dgram');
  
  var cmd = [
  	0x54, 0x46, 0x36, 0x7A, 0x60,
  	0x02, 0x00, 0x00, 0x00, 0x00,
  	0x00, 0x03, 0x03, 0x01, 0x00,
  	0x26, 0x00, 0x00, 0x00, 0x00,
  	0x02, 0x34, 0xC2
  ];
  
  var cmdMsg = new Buffer(cmd);
  
  var fs = require('fs');
  
  // Listening
  var socket = dgram.createSocket('udp4');
  socket.bind(2068, function() {
  	socket.addMembership('226.2.2.2', '192.168.168.100');
  });
  
  // Heartbeat
  var ctrl = dgram.createSocket('udp4');
  ctrl.bind(48689, function() {
  	setInterval(function() {
  		ctrl.send(cmdMsg, 0, cmdMsg.length, 48689, '192.168.168.55', function(err) {
  			if (err)
  				ctrl.close();
  		});
  	}, 3000);
  });
  
  