I’m using Sharptools with Smartthings and Fully Kiosk on an unlocked, rooted fire HD 8 running Android 9 (Lineage 16.1). It really works exceptionally well.
I have one query about adjusting brightness. Fully controls the screen on/off/brightness really well but there’s no way to use adaptive brightness based on ambient light levels. The android settings do not work well with Fully and in general Fully does a better job.
I also have a z-wave motion detector with ambient light sensor in the same room and I have the Fully Kiosk DTH in smartthings.
Would it be possible to create a rule to modify the Fully brightness level using the DTH in response to changes in lux measured by the z-wave sensor?