LoxBerry::IO::mqtt_publish/mqtt_retain/mqtt_set

Publishes a value to a MQTT topic with or without retain flag. The MQTT connection is implicitely opened to call the publish. (MQTT Gateway plugin required)

The MQTT connection is implicitely opened to the MQTT broker defined in MQTT Gateway plugin, therefore the MQTT Gateway plugin needs to be installed.  

Publishes the $value to the specified $topic. 

With mqtt_publish and mqtt_retain, the messages are published without and with retain flag.

With mqtt_set, the retain flag is the third parameter of the function call:

• If the $retain parameter is omitted or undef, a publish is used.
• If the $retain parameter is 1 (not undef), the message is published with retain flag set.

The functions return the $topic as string, if the publish was successful.

The functions return undef on any errors.

mqtt_connect

This functions do not require to first call mqtt_connect, as the connection to the mqtt broker is implicitely opened.

use LoxBerry::IO;
 
mqtt_publish( "hello/you", "You are you" );
mqtt_retain( "hello/me", "I am I" );
mqtt_set( "hello/we", "We are we", 1 );