Skip to content

clear_topic

Jump to bottom Edit New page
Victor Tseng edited this page Dec 21, 2017 · 2 revisions

An application created a topic and "left" a retained publication on it - but you no longer want that topic to exist.

The solution depends on the broker, but several brokers support the following:

Publish a message with an empty payload and the retained flag set. This clears any previously retained message on that topic.

Is this a security issue? Not necessarily, but if you don't want "just any" client to be able to do this then it is possible to use ACLs to control who can publish on a topic.

There's a mailing list discussion on this topic.

Creative Commons Licence MQTT Community Wiki by mqtt.org community members is licensed under a Creative Commons Attribution 4.0 International License and was made possible by the generosity of all of its contributors.

Add a custom sidebar
Clone this wiki locally