Correct configuration to avoid null value updates

1

Hi all,

I use the OMG on an ESP32 board to send Xiaomi MiFlora data to Openhab. In the logs, I see that the JSON sent to MQTT does not always contain all values; for example, it only sends the temperature, the fertility, etc.

In this case, all items linked to channels without an update are set to null. So, if the JSON only contains "tempc":23.9 in the payload, all other variables are set to null.

How do I avoid this, so that the other values that are not updated keep their latest value instead of being set to null?

2

Hi @Florian_Lettner

Which version of openHAB are you using?

Which discovery settings do you have on your OMG gateway?

Are you using auto-discovery for your Things/Items or are they textually defined?

3

I am on openHAB 4.3.3.

I am using auto-discovery. adaptive scan, publish advertisment data, publish only sensors, auto discovery, and openhab discovery are set to on.

4

Can your try it with openhab discovery are set to off, as this is not required any longer with the improvements made with openHAB 4.3.3.

So this option will also be removed from future OMG releases, and the details removed from the documentation.

Hopefully the new openHAB MQTT auto-discovery does now correctly recognises the is_defined discovery key, so that properties will only be changed - which includes the null values - if and when the property is actually included in received MQTT messages.

So if you can let your Xiaomi MiFlora be rediscovered with "ohdisc":false and let us know how this works then.