How to purge the retained MQTT messages?

[flemmingss]

Ref this post from 2019:

Mqtt auto discovery or not

There’s one potential hiccup with MQTT Discovery: a deleted entity might re-appear. The discovery information might be posted to the discovery topic as a retained message. This is useful because it means it is retained (stored) by the MQTT Broker. When Home Assistant is restarted, it re-connects to the MQTT Broker, re-subscribes to the discovery topic and, because the messages are retained, Home Assistant gets them immediately (and the entity is preserved). The potential hiccup is that if you …

How to purge the retained messages?

[sheminasalam]

If you have mqtt issues with tasmota devices, you can effectively clear mqtt retain messages with tasmota device manager. Take a look at this https://github.com/jziolkowski/tdm

And if you have other devices and detailed info check out this http://www.steves-internet-guide.com/mqtt-retained-messages-example/

[sparkydave (🇦🇺 Dave)]

You can also use this:

MQTT Explorer

[123 (Taras)]

You purge a retained message by publishing an empty string to the topic as a retained message. It’s as simple as that.

You can do it directly from Developer tools > Services.

In the following screenshot, we are publishing an empty string (represented by two consecutive single quotes) to the topic your/topic/goes/here/ as a retained message (retain: true).