Sup guys?

I'm a software engineer looking to understand a bit more about how handheld flashers work.

I've sniffed some traffic from a MyGenius and I see the first request sent is:

can0 7E0 [8] 03 22 F1 21 00 00 00 00

Does anybody have a list of service $22 PIDs for Mercedes/know where I can find one? I'm having a hard time figuring out what PID 0xF121 is requesting.

I've read service $22 is SAE J2190 for Ford/GM. Can anybody confirm is service $22 is SAE J2190 for Mercedes? If it isn't, what is it? Is service $22 UDS (Unified Diagnostics Service) in this case? What service does UDS usually live on?

I think you have the knowledge to be playing around with Vediamo. The SW is free, I you will have to invest in DAS C4 system.