Ikea tretakt

I agree, the KAKU switch ZCC3500 appearantly also sends a status update when the knop on the switch is used. Might be implemented by sending status updates whenever the status of the switch is updated, be it switched locally on the switch or remotely by Homey. That is a kind of acknowledgment on the appication layer, not at the ZigBee layer. Anyway, as we don’t know the design of the switch, it is just guessing what is the cause, but the result is disappointment.