Three CAN transcievers and a microph^WBLE module.
Actually it’s more like 6 CAN transcievers and 2 LIN transcievers. The goal is to “break into” the three CAN and two LIN buses on my 2015 Passat TDI and be able to “filter” them, providing total control over the communications links in the car.
By default only three CAN and one LIN transciever will be active and small relays will “bridge” the gap between the “A” side and “B” side. This will allow me to monitor and inject messages but will not otherwise interfere. By opening the relay I open the possibility of filtering or altering messages from one side to the other. This requires more careful planning as there may be strict timing requirements that I may not be able to maintain. I won’t know until I get into it.