Thanks @Brecht, @skazi, @mcullmann, I have created a new turorial/solution topic for this - still WiP
@rlkoshak please make that a wiki.
Next should be rolloshutters.
Thren I have a challenge for Logo clocks. How to write times? Reading times works already nicely with plclogo-binding. Android HMILogo app does that with a perfect widget (3 tabs for 3 clocks, weekday-selector, on/off-time reader + setting)