moha/hooks/scripts/availability.php

<?php

class availability extends hook
{
	public $hookname = "availability";
	public $active = true;
	// by default all devices are listening for availability
	protected $devicelist = array();

	protected function iterate()
	{
		global $indexDevices;
		foreach ($indexDevices as $ieeeAddress => $value)
		{
			if (!key_exists("availability", $value->properties))
			{
				$value->properties["availability"] = "";
			}
		}
		$this->installHooksFunction($indexDevices);
	}

	function installHooks(&$indexDevices)
	{
		$this->installHooksFunction($indexDevices);
		return false;
	}

	function installHook(&$device)
	{
		global $indexDevices;
		$this->devicelist = array($device["device"]->ieeeAddress => "availability");
		$this->installHooksFunction($indexDevices);
	}
	// callback fonction. Is called with these 3 parameters
	// $device 	-> calling device
	// $property 	-> parameter passed by mqtt
	// $value 	-> value of the parameter
	public function callBack($device, $property, $value)
	{
		switch($property)
		{
			case "availability":			// theorically can't be other, but ....
				if ($device->properties["availability"]["value]"] != $value)
				{
					//echo "==========>>>>>> Availability $value" . EOL;
					//if (!empty($device->availability))
					//{
						$log = ALERT;
					//}else
					//{
					//	$log = INFO;
					//}
					//$device->availability = $value;

					logger($log, sprintf(_("Device: %s/%s is %s"), $device->topic, $device->friendlyName, bool2string($value)), __FILE__ . ":" . __LINE__, $device);
				}
			break;
		}
	}
}

$hooks["availability"] = new availability();
?>