changing probe, state of the entity is not changing to zero or to 'unknown'.

[rhamar]

Another problem I have is when changing from probe, for example from 2 tot 3. The state of the entity is not changing to zero or to 'unknown'. The last measured temp on probe 2 is still showing.

[souhl]

My guess is that it just shows the last value received. (Wherever you display the values)
When a probe is just removed it should be the same, as only new values are shown. If the displaying entity is never receiving a „unknown“ value it won’t display it by its own. A solution might be to send one „unknown“ state message after a period of time not receiving new values from the probe.

[rhamar]

So what I found is that the MQTT client will not send information to the MQTT broker when no probe is connected.

I did a little deep dive.

igrill.py, line 153:
temps[probe_num] = float(temp) if float(temp) != 63536.0 else "False"

/usr/local/lib/python2.7/dist-packages/paho/mqtt/publish.py, line 168:
payload : the payload to be published. If "" or None, a zero length payload will be published.

If you want the mqtt client to send a message with a payload with no probe connected, you should change line 153 into the following:
temps[probe_num] = float(temp) if float(temp) != 63536.0 else "None"

And that did the trick (see screenshot). Now I have to modify Home Assistent so it can handle this value.

To be continued

[bendikwa]

This was by design when I implemented it.
I am not using Home Assistent for this project (I am using Prometheus/Grafana), and changing this would brake my setup, but I will consider making behaviour for disconnected probes configurable in a future release.

[bendikwa]

Better late than never: ;-)

I have added a new feature for this now:
Device config now takes 2 new optional flags.

publish_missing_probes: False                    # Optional default False - Enable sending a value for non-connected probes
missing_probe_value:    'missing'                # Optional default 'missing' - Value to send if publish_missing_probes is True

-Bendik

[PaulAntonDeen]

Works wonders! Tanks!