MQTT::message_id command listed in iRule examples not available

Hi,

 

I'm testing v13 MQTT functionality with IoT devices using the iRule examples published by F5 here:

 

https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/ltm-iot-administration-13-0-0/1.html

 

I found the MQTT command 'MQTT::message_id' produces an error in v13 when used in an iRule and have had to comment all lines using this command out to avoid the error:

 

01070151:3: Rule [/Common/Log_MQTT_Messages] error: /Common/Log_MQTT_Messages:16: error: [undefined procedure: MQTT::message_id][MQTT::message_id]

 

I also noticed that the command is not listed on the iRules command list for MQTT:

 

https://devcentral.f5.com/wiki/iRules.MQTT.ashx

 

I've not found any mention of the error with this command in DevCentral, anyone heard any news on it?