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libpcap can sniff Bluetooth and the S-class has Bluetooth?

Otherwise I'm guessing it's probably all just part of their standard tool chain and someone said "give me a list of all open source software you used while developing the software for the S-class".

Bluetooth is certainly one possibility, although libpcap can be used for a broad range of protocols, including USB and CAN, which are other candidates in a system like this.

Everything in this header that starts with DLT_ is a supported data link type: https://github.com/mcr/libpcap/blob/master/pcap/bpf.h

Someone else suggested that they're probably used by diagnostic tools.

All that would be used for on-board diagnostics for the different electronic control units.