I am writing some KWP2000 routines over TP20.
Normally you send or receive an ACK (Bx) byte at specific moments.
Sometimes I am receiving a 9x byte, which seems to be an "ACK but not ready for next packet".
I can't find any information on what to do in this case?!
The only TP20 info I found is here: http://jazdw.net/tp20
Anyone know this, or has some log where this ACK is used?