Hello Marc and Lars, I have been searching for a possibility to set the CAN FD data bitrate with libsocketcan recently and came across this [1] old thread. It seems like there has never been a final patch? If this is the case I will look into it myself but I wanted to make sure there is no other solution already present beforehand. [1] - https://marc.info/?l=linux-can&m=153418949026459&w=2 Regards Thomas Wagner