CANBUS
CommonRail has written a superb guide on how to investigate the CANbus on your system - give it a good read!
https://discourse.agopengps.com/t/canbus-for-beginners-super-simple/3814/884
https://discourse.agopengps.com/c/hardware/canbus/33
Here's a success story using the AIO and CANBUS to control an MF 6718S
The Teensy has 3 CANBUS receivers on it, but you still need transceivers. The AIO 2.4 board has space for 2 transceivers and the 4.x boards have space for 1. The part you're looking for is https://www.mouser.co.uk/ProductDetail/579-MCP2562T-E-SN
These are absolutely tiny and you'll be soldering them on here most likely:
CommonRail has an excellent resource including the code you need here on how to learn about CANBUS, and control your machine with it.
CAN connector pinout:
Massey Ferguson - steer bus location:
Fendt (V-Bus is for steering):
If you want to learn how to sniff the CANBUS and find out joystick codes etc, watch this: https://youtu.be/O01Fy4dBw6s