Originally Posted by jlu

Maybe something like this could help in libobd's obd-chan-elm.c after ATAT2 command and its response test and before sending "0101"

Code:

	if(obdchanelm_ssendcmd(chan, "ATSP0", 6)) { /* Set protocol to Automatic  */
		ret = OBDCHANERR_SETUP_ERROR;
		goto error;
	}

	if(!strstr(pelm->buffer, "OK"))
		LOG_WARNING("Unable to set ELM to use Automatic protocol");

The third parameter of obdchanelm_ssendcmd is a timeout, so a suitable value might have to be tested.