MQTT: How to set UNDEF when invalid data returned from Zigbee2MQTT?

[rlkoshak (Rich Koshak)]

@mariobrx

Another workaround would be to work with dummy items and copy them to the right item with a rule (when item changed…). This allows to sort out the 9999 values and use a postUpdate(UNDEF).This doubles the number of those items, but I have a script that can handle that

A better work around is to:

1. create a .persist file and exclude these Items from being saved.
2. create a rule that triggers when this Item changes
3. if and only if it’s a valid state, call .persist() on the Item to save the value

That will only store valid values to the database.