In the case of the Massey, altho the tractor was steer-ready, it wasn’t unlocked and while I could record “engage AOG autosteer” and have the tractor recognise it as “engage autosteer”, when it came time to play that sequence back, the tractor apparently wouldn’t send the code as it knew the tractor wasn’t unlocked for it.
In the case of JD, we can’t steer it over CANBUS as yet, so I’d write that one off as a non-starter but if you can trap the headland-management engage button and have that act as the autosteer-engage for AOG, that might be doable.
However, I fully expect JD to make that needlessly difficult to work out, even something as simple as a button press.
I already put up a video on how to use the headland engage button to start/stop AOG, the thread for that is here: CANBUS sniffing - for beginners