According to https://homey.app/nl-nl/app/org.knx/KNX/ it is Athom.
You might search this forum for “KNX”, maybe this makes sense to you: KNX Dimmer
According to https://chatgpt.com/share/00db250f-c598-4c98-a628-c980e7e68b9e you need several groupadresses.
