Collision sensing for Marlin

[aero4]

Hi @markniu!

Because the thermal drift of the probe affects my nozzle to probe offset significantly and I have to adjust this offset nearly every print, the announced "bed collision sensing" would probably eliminate that adjustment and simplify my complex homing routine.

Therefore, my question is, when will collision sensing be available for the Marlin firmware? Are there already some implemented functions for Marlin in the Marlin bugfix branch? When is this feature planned?

Thanks for any information in advance!