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MQTT Auto Discovery does not getting anything

Posted: Monday 05 January 2026 18:02
by NvBgm
Hello,
I'm trying to retrieve the data I'm sending from the P1 monitor to the MQTT broker back into Domoticz. I think I've entered all the settings correctly, but I can't see any sensors or devices in Domoticz.
In MQTT Explorer, I can see all the topics correctly.
Am I missing something or doing something wrong?

Re: MQTT Auto Discovery does not getting anything

Posted: Monday 05 January 2026 21:34
by waltervl
Without more information not a lot we can tell.
Do you also see config topics in the MQTT explorer homeassistant folder?
What application is sending P1 info to MQTT and is it configured that it also creates a discovery config topic?

Re: MQTT Auto Discovery does not getting anything

Posted: Tuesday 06 January 2026 15:27
by NvBgm
Okay, I'm afraid the problem is that the P1monitor isn't sending a discovery config thread.
When I look in MQTT Explorer under HomeAssistant > Weather > Temperature, I only get the date/time/value.
In the History tab, I see a graph. No JSON information. So I assume auto-discovery won't work. Is there another way to import the value into Domoticz from the MQTT broker?

Re: MQTT Auto Discovery does not getting anything

Posted: Tuesday 06 January 2026 16:40
by waltervl
You can also not use the P1monitor application and use Domoticz to read your P1 smart meter directly https://wiki.domoticz.com/Dutch_DSMR_sm ... th_P1_port

There is also Node-Red or the MQTTmapper plugin.

Re: MQTT Auto Discovery does not getting anything

Posted: Tuesday 06 January 2026 17:05
by waltervl
Also check this discussion: viewtopic.php?t=33631

Re: MQTT Auto Discovery does not getting anything

Posted: Tuesday 06 January 2026 18:44
by NvBgm
Yes it can if you use a P1 port splitter.
https://www.homewizard.com/nl/shop/acti ... m_term=721