I would love to see something like this for my Defender td5. It's not standard OBD but something proprietary. So you need a nanocom and the defender license, which is about 700€ or something in total. I just want to read out the errors, that would be nice. Does anybody know how I'd go about hacking on that?

/edit: I actually found something https://github.com/EA2EGA/Ekaitza_Itzali. Awesome!