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I have follow the instructions but I receive only CAN_NOMSG (4), status from Arduino. Looks like the shield isn´t sending any message to OBS reader, and in fact the RX and TX didn´t blink, I´ve tested with other program and the shield looks fine. What should be wrong?
Can you suggest an App to use with the ELM device? Those I´ve tried don´t let me conect, looks like the protocol is not recognized.