Write hex value to a characteristic?

I also tried the simulation. At first the PlayBulb app always crashed.
Then I also entered some (most) of the default values I found in the original PlayBulb (e. g. the version strings).
The app then worked, but I could not find/read any values in LightBlue that were changed.

However, I have just now started testing the puck against the real device.
Will give you an update in a few minutes.