status_mqtt.php

<?php
//
// download phpMQTT from https://github.com/bluerhinos/phpMQTT
//
error_reporting(0);
require "phpMQTT.php";

$server     = "127.0.0.1";
$port       = 1883;
$username   = "";
$password   = "";
$client_id  = "";

$mqtt = new \Bluerhinos\phpMQTT($server, $port, $client_id);

if ($mqtt->connect(true, NULL, $username, $password)) {
  echo 'Online\n';
} else {
  echo "Time out!\n";
}