[hdpowerview] Hub not updating state => Help needed

My HDPowerView (Luxaflex) shades controller is frequently not updating the actual position state of the shades, and I am struggling to find the exact cause of the problem or its resp. solution.

I don’t know if the problem is with a) in the proprietary connection between the shade motors and the hub, or b) in the connection between the hub and the OpenHAB [hdpowerview] binding. Unfortunately log:set DEBUG or log:set TRACE in the binding does not provide any additional information that would help.

So I think I need to build a special debug version of the binding jar, and insert some code to test what is going on. => Does anyone have any documenttation or advice how to proceed?