WMPRO, WMMINI FW >= 1.1074 WMMEGA FW >= 2.1078

Subscribe to an MQTT channel

$channel: Channel to subscribe to. See MQTT Configuration

$callback: Callback script to execute upon receipt of a message

1 if successful and 0 on failure

<? 
// Use the # as a wildcard so any messages to /cluster/1/ or its sub channels will be received
 
mqtt_subscribe("/cluster/1/#","/scripts/tests/mqttsub.cgi");
?>

Callbacks can use the stdin file to read input. Use fgets() to get the first line, which will be the full channel. The following lines will be the data received.

<? 
$f=fopen("php://stdin","r");
$st=fgets($f);
$msg=fgets($f);
$response="";
if (substr($msg,0,3)=='get') {
	$variable=substr($msg,4,strlen($msg)-3);
	$response=$variable.":".$_GLOBALS[$variable];
}
if (strpos($st,getmac()) || strpos($st,'/all')) {
	if (strpos($st,"get")) {
        mqtt_publish("/cluster/1/ret/".getmac(),$response);
	} else {
		if (strpos($st,"ret")) {    
			print("Notification was properly posted");
		}
	}
}
?>

On WattmonPRO & MINI the maximum packet size is 128 bytes. On WattmonMega, M2 & Mini2 the maximum packet size is 2048 bytes.

mqtt_publish() - Publish to an MQTT channel