On my S3 AMK this works when ignition is on:
[Communication]
Connect = SLOW-0x00 ; Possible values: SLOW-0x11, FAST-0x10
DoubleDelay = 12
Communicate = HM0 ; Possible values: HM0, HM2-0x10
LogSpeed = 38400 ; Possible values: 10400, 14400, 19200, 38400, 56000, 57600, 125000
then start the car