ObjectModel reference: https://github.com/Duet3D/RepRapFirmware/wiki/Object-Model-Documentation
How to detect Object model updates: https://forum.duet3d.com/topic/16703/suggestions-for-the-object-model/3 https://forum.duet3d.com/topic/30448/how-to-detect-board-disconnection/2
Good background: https://forum.duet3d.com/topic/25300/how-to-dump-the-entire-object-model