How to limit decimal digits in channel definition?

[powerpolly (Matthias P)]

I have a couple of shelly switches which report current Watts. Values are coming in with 2 digits accurancy:

2022-10-26 10:32:00.352 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'Licht_Grillterrasse_Tisch_W' changed from 0 W to 0.03 W
2022-10-26 10:32:03.732 [INFO ] [openhab.event.ItemStateChangedEvent ] - Item 'Licht_Grillterrasse_Tisch_W' changed from 0.03 W to 0 W

is there any chance to limit the decimal places to 1 or 0 on the channel definition?

intention is to prevent rules from triggering on minor change of a value.
thanks

[rossko57]

@powerpolly

is there any chance to limit the decimal places to 1 or 0 on the channel definition?

No.

But do look into profiles, which operate on the channel-Item link - and so allow manipulation of data between channel and Item.
You might do rounding with a little javascript transformation.

@powerpolly

intention is to prevent rules from triggering on minor change of a value.

Why, it doesn’t cost anything?
Bear in mind that adding code or config elsewhere to do the rounding is only moving the work on every change.

[opus (Jürgen Baginski)]

In addition to @rossko57 :

@powerpolly

intention is to prevent rules from triggering on minor change of a value.

The more common way would to define different trigger-values for ON-to-OFF and the OFF-to-ON case (iaw define the hysteris). A bigger the difference will result in a less frequent trigger events.