I noticed that support for MAV_SYS_STATUS_PREARM_CHECK exists in the master branch on this commit. It appears that this commit has not made it into Copter 4.0.5. Is there a reason this has not been merged ? Is it possible to include this in the next release ? It would be really handy to be able to identify a prearm failure by looking at the MAVLink status packet.
That is wonderful news. It will be great to see your code make it into the Copter release. Thank you for your quick reply !