Implementation of CAN bus

[ethanrushh]

It would be great to get an implementation of CAN bus going to check off the TODO list. Steering wheel controls are of large concern to me. How would CAN logic best be specified in a way thats easy to change?
On PQ-35 (VAG 2010-era cars), MFW controls are ID 0x5C1 and the first byte:

none(0x00),
leftPadLeft(0x03),
leftPadRight(0x02),
leftPadUp(0x06),
leftPadDown(0x07),
leftPadCall(0x1A),
mic(0x2B);

(copied from my own Flutter code)

The CAN bus will rapidly repeat the message when a button is pressed and send 0x00 when it is released, indicating a press. If we just had a simple CAN filter for each button to send to the Carlinkit, this would be problematic in this scenario as the messages would be spammed for a single physical button press.

It would also be great to be able to map something like an iDrive controller for navigation.

While I would happily do the work and submit a PR, my C++ is beginner at best. If I am able to assist in any way with information around CAN internals or logic then I would be more than happy to help.

[niellun]

The app can read key codes from pipe. Check settings file for line key-pipe-path.

You can set
key-pipe-path = "/tmp/fastcarplay_pipe"

And than create a simple python script that will read CAN, decode and send it to pipe. Check example https://github.com/niellun/FastCarPlay/blob/main/examples/keylistener.py, which is reading ADS sensor for steering wheel resistive buttons.

[ethanrushh]

I did since see that, my apologies. I think it would be a good idea to list this functionality in the README and potentially take CAN stuff off of the TODO list as the named pipe is probably the best solution for this problem. Thank you for your reply.

[niellun]

Yeah I need to work on documentation....