This is just a simple template how information can be sent from the MM1 while the Donkey Car is driving which is then printed to the Donkey's console. Initially meant for battery values, but there is a better workaround. It is inspired by the already present communication (mainly throttle and steering values from the car to the MM1) and could be used for anything.
What to do? Just exchange the robohat.py part of your Donkey Car and the code.py on the Robohat MM1 (see here how) with the ones provided here.
Actually there are not many changes ... the ones present are marked by # EXCHANGE INFORMATION