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Is it possible to reset the value of the kWh counter in the Fibaro WAll plug FGWPE?
I can read the value with:
http://raspberry_IP:8083/ZWaveAPI/Run/devices[2].instances[0].Meter.data[0].val.value
the data[0] element holds the kWh figure.

I can't find how to reset that specific meter. What works is to reset the whole thing:
http://raspberry_IP:8083/ZWaveAPI/Run/devices[2].instances[0].Meter.Reset()

But that is not what I want, because it temporarily shuts of the lamp too.
The Fibaro datasheet is vague about this.

Edit: From the Razberry menu device control/meter I notice that the Reset button there does the same "rude" reset.

This might be the problem of Fibaro, since with Everspring it works perfectly. What does it that it is not supposed to do? Switching off the device?

I encountered this during the development of a Meter function in RaZ-OR.

Yes it is mainly the switching off that bothers me now. I want to reset meters silently without disrupting an other function on the device.

Taking it more broadly I can imagine that I might get a device with more than one accumulating sensor. I would like to have the option to reset them individually. I am wondering if that is at all possible with Z-Wave commands.

This is from the spec: "The Meter Reset Command used to reset ALL accumulated values stored in the meter device.". So, the answer is no ;( Only if they are separated by channels.