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Please show your controller capabilities. Looks like license is not applied

Fixed. We have reached a limit of our server resources - we are working on optimization, but looks like it is late compared to our client base growth. We will certainly add more resources.

Putting all work with the Serial in the loop function leaving only simple variable assignment in the getter and setter

I would suggest to minimize your getter and setter by moving all serial in loop. This should help and make this code even smaller.

One because controller polls the channel it controls - it do not know about mapping and don't poll the mapped one

One solicited on poll

Because ttyACM0 is the USB port for UZB1. Please change it to ttyAMA0.

I also suggest to install Z-Way first (and then turn it off) to let it configure the ttyAMA0 port and disable the Bluetooth.

But better to use Z-Way

The device (dimmer) that corresponds to the volume should update its state when volume level is changed. You can use it in rules

The only thing I do not understand, is why channel one getter is called three times instead of two...

Because Z-Uno does unsolicited report on the channel and in the mapped non-channeled CC.

We are working on it - will be back soon.