The hardware I'm using is:
Octopus Pro v1.1
BTT U2A
BTT EVV SB2209 CAN
After plugging in all the wires and flashing each board, I am able to connect to Mainsail and see the temperature of the extruder, so I assume it's been flashed correctly.
However, when I try to control anything on the toolhead (the fan, LED, extruder temp), nothing happens except a timeout error when the extruder doesn't heat up in time.
I believe it's a config issue. Below are my printer.cfg and my ebb.cfg.