@TP-Link I think you got the wrong related post, because that post is not related to be able to add a custom Zigbee device to your network.

Does annybodyknow if it is possible to add zigbee devices that are not already supported by the platform? Before reading, I am able and willing to do the programming myself if needed.

Also, please note that in europe we have 50Hz and 230V. I have a use case for 2 dimmers and 2 switches. Or if this is not possible to support third party products within kasa that offer the same...