moha/hooks/scripts/availability.php

<?php

class availability
{
	// by default all devices are listening for availability

	function __construct()
	{
		global $devices;
		$this->iterate($devices);
	}

	private function iterate(& $device)
	{
		foreach ($device as $key => $value)
		{
			if (gettype($value) == "array")
			{
				$this->iterate($value);
			}elseif (is_a($value, "device"))
			{

				$value->availability["functions"][] = array($this,"callback");
			}
		}
	}
	// 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->availability != $value)
				{
					//echo "==========>>>>>> Availability $value" . EOL;
					if (!empty($device->availability))
					{
						$log = WARNING;
					}else
					{
						$log = INFO;
					}
					$device->availability = $value;
					logger($log, sprintf(_("Device: %s/%s is %s"), $device->topic, $device->friendlyName, $value));
				}
			break;
		}
		//echo sprintf(_("notification received from MQTT -> device %s is %s"), $device->friendlyName , $value). EOL;
		//echo $property . "=> " . $value . EOL;
	}
	/*
	public function getHook()
	{
		return array($this,"callback");
	}*/
}

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