UAVCAN hardpoint control

[pavel-kirienko]

Controlling OpenGrab EPM (electropermanent magnet) and (in theory) other compatible grabbers via UAVCAN.

These changes depend on ArduPilot/archived-PX4Firmware#57, although they can be merged separately - nothing will break, the feature just will not work.

FYI @ctech4285 @silverburn

[gmorph]

Do you have a link so we can see a picture of the electro grabber?
You have a number of white space changes in the commit which make it harder to review. Any chance you could update the commit with just the code changes? "git add -p" is your friend :-)
Thanks, Grant.

[pavel-kirienko]

Info about the grabber: https://docs.zubax.com/opengrab_epm_v3

The commits have been squashed and whitespace changes reverted. I don't understand though how whitespaces make changesets harder to review - ?w=1 at the end of the URL is your friend ;)

Let me know if there's something else that needs to be fixed.

Thanks!

[pavel-kirienko]

This is a quick reminder that this PR is ready to be merged.

[ctech4285]

Yeab I would very much like to see this merged pretty please

[silverburn]

Yeah, be really keen to be picked up too.

[tridge]

thanks Pavel! I tested here and it looks good. Merged.