Great work Daniel! Big kudos!
Has anyone been able to get events from the sensor, the button or the dimmer?
I've just had little hacking time with these (some CoAP poking) - while as we know we get can UDP observe the states of the lamps (in 15001), observing the buttons in the same way seems to do nothing when clicking.
However, as an alternative, I tried observing a group (in 15004). It had a lamp in it, but it was disconnected from power (next would be to try without a lamp, or to define a "ghost lamp" in there).
I actually got the power events for this group (5850 alternating 1 and 0) when clicking the power button on the round button. Maybe this could work for the sensor alone in the same way?
I did not get notifications when clicking the dimmer/color buttons.
Feel free to continue this lead - It would be great to be able to use the IKEA actuators as well!