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.
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".