How to make status of Sonoff (Tasmota) devices get updated in MQTT / OpenHAB2?

Laurentp

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Apr 4, 2021, 7:11:29 PM4/4/21

to TasmotaUsers

Hi there,
I am stuck with following problem:
- Tasmota devices send their LWT messages as "retained" (so device status in MQTT broker - Mosquitto) is ALWAYS "Online".

I want to see in OpenHAB2 REAL status of device, eg online / offline (did not send MQTT for some time).
How to do it?

Laurent

Philip Knowles

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Apr 5, 2021, 2:11:41 AM4/5/21

to TasmotaUsers, Laurentp

The LWT statement shouldn't be 'Online'. It is the statement which is retained by the broker to send when the device disconnects from the broker. It must be retained so that it can be sent as the Last Will and Testament to tell the control system the device has gone.

Regards

Phil K

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Subject: How to make status of Sonoff (Tasmota) devices get updated in MQTT / OpenHAB2?

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Jon Eskdale

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Apr 5, 2021, 5:16:50 AM4/5/21

to Laurentp, TasmotaUsers

I use my Tasmota device with Mosquitto and Node Red - With Node read configured to send me an email

This works brilliantly, I get an offline and online email as the device goes off and online

Jon

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Philip Knowles

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Apr 5, 2021, 9:04:07 AM4/5/21

to Laurentp, TasmotaUsers

If you create an item in a LWT.items file like this

String MiFloraLWT "MiFlora LWT" {channel="mqtt:topic:MiFlora:LWT"}

And then in your sitemap

Text item=MiFloraLWT label="Miflora LWT [%s]"

You will get this when the device is online

And this when it disconnects from mosquito

You can use the following in a rule

when

Item MiForaLWT changed to “Offline”

then

do something

end

You could also use the dynamic sitemap features

Text item=Flower_Moisture visibility=[MiFloraLWT == "Offline"] labelcolor=["red"] label="Moisture [Offline]" icon="Humidity"

Text item=Flower_Moisture visibility=[MiFloraLWT == "Online"] labelcolor=["green"] label="Moisture [%.0f %%]" icon="Humidity"

Which will give you the following when offline

and this when online

Regards

Phil K

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From: Laurentp
Sent: 05 April 2021 00:11
To: TasmotaUsers
Subject: How to make status of Sonoff (Tasmota) devices get updated in MQTT / OpenHAB2?