You are all really brilliant!
Thanks for this nice and kind helping.
So, in my first post I was in doubt how to define my question but not to go too far
from the mayor thinks of my problem.
I studied the CAN protocol many times, and read lot of stuff on the net,
but talking with real peoples are much better for me.
I know does my hardware and software are working because I used the "OBD-II PIDs"
data from Wikipedia
https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_1_PID_00and I also made the formula calculation of the returned data from the ecu and it was ok.
I use the ELM327 and HyperTerminal to sniff the CAN network for now.
The main reason is for this because I have some flashing tools for ECU's which are make some strange
thinks sometime.
I also repair them too.
So, I got an idea how to test the lets say CAN communication after repairing the flashing tool is,
to hook up to the CAN line a CAN sniffer.
Send some sort of command from the flashing software which is the original software from the flashing tool on the pc.
Let's say some sort of ECU identification.
The sniffer should get the data what was sent from the flashing tool.
Actually, nobody would answer to the request from the flashing tool but some sort of info is captured.
The flashing tool will show up an error like "No ecu" etc...
That's nice and cool.
But, when I started my project to see how stuff is working, I realized does some sort of info is
really captured, that is that 200 01 0C.
That was transmitted on the CAN wire from the flashing tool for one model of car.
When I selected another model of car I got another data what was totally different.
I tried lot of cars and lot of them was different but some of data was the same on different
cars I assume because the ecu was the same, even if the car model was different.
So I got a sort of patterns.
Than I changed to another flashing tool and started to sniff the packets with the exactly same
car models and ecu's like before.
I got the same patterns.
That makes sens.
Than I come to the idea maybe this type of data will show me some sort of info like "ecu wake up" signal or something like that.
I wish to develop a small tool for me what I can use to check if the signals which are traveling through the CAN network are
really CAN signals or just some sort of fake signals.
For that I use my oscilloscope, and that is nice and good for me, but I wish to make some steps more and deeper in the world of CAN.
If it is possible somehow to know if a device like a ecu flasher tool send a regular CAN signal or not, but not to kill some ECU etc..
So, this is my whole story.
If any idea thanks.
My best regards.