Thank you for the additional info. It is now clear, that the LIDL button behaves the same way as the Tuya smart knob.
I did some further tests today, I am able to successfully add the device to a Zigbee group :
However, because the devices can not be bound to unicast to HE hub but do a group broadcasting, the packets sniffed do not reach HE hub :
I don't think anything more can be done on a driver level to make HE listen to the inbound Zigbee group broadcasts.
As an alternative, you can look for Philips Hue or OSRAM Lightify dimmers, these should be still available on ebay.de and work very well with HE.
