tobithiel

As far as I understand their technology this is not true. My understanding is that the system keeps a distance to a vehicle in front and corrects the steering should the vehicle leave the lane.

Even Audi themselves offers active lane keeping assist and adaptive cruise control systems. I'm not sure if this is available in the A4, but they offer it in their more expensive models. Mercedes-Benz also has both systems available in the S-Class.

I couldn't find any detailed information on their site as to what they cover, so please correct me if I'm wrong, but I don't see their additional value right now.

These things not always work very reliably. A guy from a supplier once held a security talk at our university. They basically filter out unwanted messages, but the manufacturer often don't configure them very restrictive, but use black list approaches.

These are mostly used for diagnosing/debugging the newer head units. They rely on BT and standard networking. GCC is pretty standard for any embedded device, I would say.

Does the phone actually send the TCP packets multiple times? Then it would certainly put more stress on the network. Does anybody know how fairness compared to non-multipath TCP stacks is achieved?

You can just use iptables-apply. It achieves the same thing and is built-in. If you don't confirm the changes after they are applied, because you locked yourself out, they will be rolled back.