I am trying to revise to code to work newer libraries. Target to make it compatible with https://github.com/f-io/pi-carplay project. 

pibus
=====

Raspberry Pi BMW ibus interface software


rpi - Software to run on the Raspberry Pi
attiny2313a - Firmware to run on the ATtiny2313A microcontroller


See www.pibus.info for more info.