# How can I find out \*who\* is publishing a message in MQTT?

**URL:** <https://discourse.nodered.org/t/how-can-i-find-out-who-is-publishing-a-message-in-mqtt/81732>\
**Category:** General\
**Created:** [3 October 2023 02:21 UTC](https://discourse.nodered.org/t/how-can-i-find-out-who-is-publishing-a-message-in-mqtt/81732 "2023-10-03T02:21:36Z")\
**Posts on this page:** 1\
**Showing post:** 31

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**Author:** ![TotallyInformation](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/totallyinformation/32/31_2.png) [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Post date:** [6 October 2023 11:12 UTC](https://discourse.nodered.org/t/how-can-i-find-out-who-is-publishing-a-message-in-mqtt/81732/31 "2023-10-06T11:12:10Z")

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The other thread:

> [@🕸️ MQTT v5 Viewer - View a range of topics with values and extended MQTT v5 data](https://discourse.nodered.org/t/mqtt-v5-viewer-view-a-range-of-topics-with-values-and-extended-mqtt-v5-data/81825):
>
> I will publish this as a Flow once I'm happy that it is a bit more complete. However, as some have expressed an interest ... A [thread was raised on the forum recently](https://discourse.nodered.org/t/how-can-i-find-out-who-is-publishing-a-message-in-mqtt/81732) about being able to track who/what updated an MQTT topic. It was suggested that MQTT v5 userProperties would be good for this. However, there really doesn't seem to be a decent viewer that includes MQTT v5. MQTT Explorer is kind of the gold standard viewer but it isn't being developed any more. So for some time I've been consideri…

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_[View the full topic](https://discourse.nodered.org/t/how-can-i-find-out-who-is-publishing-a-message-in-mqtt/81732)._