I attempted to add minimal dimmer support but I have no device, I can only simulate it to test. It's not even close to enough testing for a PR submission.
Is someone interested in testing it on their device?
link to dev branch
- platform: knx
name: 'knx light'
- address and state_address should (hopefully) be backwardly compatible
- brightness_address is for reading the current device level
- dimmer_address is for setting the target level
Note: The HA frontend and base light component uses 0 - 255 for brightness already so I didn't put in a percentage conversion for DPT_Scaling