Hi,
I was trying to communicate with ODB2 with my 206 1.1cc auto peugeot which should have the KWB2000 slow protocol.
I built the optoisolated hardware interface and it works properly with perfect signal ascent and descent fronts.
I started testing examples of read_softserial.ino library and modified readerKWP.ino for AltSoftSerial.
The first example with debug enabled has this log :
"
Looping
Before magic 5 baud.
Before setting port.
After setting port.
First read is: 85
read v1: 233
read v2: 143
v1: 233
v2: 143
init_success: 0
"
The problem is that the numbers V1 and V2 are different and initialization fails.

With the second example it fails without log.

I don't understand why V1 values other than V2.

Some suggestions?