readerKWP not working for me

[iwanders]

readerKWP not working for me

[iwanders]

UPDATE: Solved the problem now it works without a problem.

Great news! 🎉

can you suggest how can I receive without sending any request just keep receiving the frames.

Normally, the OBD9141 protocol doesn't support that. As far as I know the ECU is always the slave, and you have to actively request information and then listen for the response. I've not heard of any ECU that proactively sends information.

If this answers your question, please close this issue. :)

[jwdsoft]

Thanks for your reply.
I didn't clarify it enough for you.
I know that the ISO9141 protocol doesn't support that.I don't mean to connect the arduino to the ECU and wait for it to send something since it will not send anything.
what I meant is to connect a diagnostic tool to the ECU to let it talk and connect the arduino to see the communication between the DiagTool and the ECU (just like the Scope or the logic analyzer)
so is that possible. the arduino will be only listening without interfering with the communication

[iwanders]

so is that possible. the arduino will be only listening without interfering with the communication

Yeah, should be possible. Not sure if you need this library for that... it may help with the parsing though.

Just enable the serial port with the right baud rate as set_port(true) would do. Then you can just read bytes from the serial port and those will be the bytes going over the kline. Depending on the timing of your particular vehicle you can probably just do a readBytes on the serial port with an appropriate timeout, the standard request method has the read code here.

In short; set up the Rx line and serial port (see begin). Then use readBytes on the serial port to read whatever goes over the bus.