For dimming lights with a Phillips Hue Tap Dial you can use the deconz_relative_rotary_event
Event when the switch is rotated 1 click:
"event: new
rotation: 15
duration: 400
Event when the switch is rotated 2 clicks:
event: repeat
rotation: 30
duration: 400"
With 3 clicks the rotation will be 45 and so on.
Is it possible to connect the rotation value to the brightness step of the light?