Method initializeELM

src/ELMduino.cpp:87–191

bool ELM327::initializeELM(const char& protocol, const byte& dataTimeout) Description: ------------ * Initializes ELM327 Inputs: ------- * char protocol - Protocol ID to specify the ELM327 to communicate with the ECU over * byte dataTimeout - Number of ms to wait after receiving data before the ELM327 will return the data - see https://www.elmelectro

  * --> *user adjustable
*/
bool ELM327::initializeELM(const char& protocol,
                           const byte& dataTimeout)
{
    char command[10] = {'\0'};
    connected = false;

    sendCommand_Blocking(SET_ALL_TO_DEFAULTS);
    delay(100);

    sendCommand_Blocking(RESET_ALL);
    delay(100);

    sendCommand_Blocking(ECHO_OFF);
    delay(100);

    sendCommand_Blocking(PRINTING_SPACES_OFF);
    delay(100);

    sendCommand_Blocking(ALLOW_LONG_MESSAGES);
    delay(100);

    // // Set data timeout
    snprintf(command, sizeof(command), SET_TIMEOUT_TO_H_X_4MS, dataTimeout / 4);
    sendCommand_Blocking(command);
    delay(100);

    // Automatic searching for protocol requires setting the protocol to AUTO and then
    // sending an OBD command to initiate the protocol search. The OBD command "0100"
    // requests a list of supported PIDs 0x00 - 0x20 and is guaranteed to work
    if (protocol == '0')
    {
        // Tell the ELM327 to do an auto protocol search. If a valid protocol is found, it will be saved to memory.
        // Some ELM clones may not have memory enabled and thus will perform the search every time.
        snprintf(command, sizeof(command), SET_PROTOCOL_TO_AUTO_H_SAVE, protocol);
        if (sendCommand_Blocking(command) == ELM_SUCCESS)
        {
            if (strstr(payload, RESPONSE_OK) != NULL)
            {
                // Protocol search can take a comparatively long time. Temporarily set
                // the timeout value to 30 seconds, then restore the previous value.
                uint16_t prevTimeout = timeout_ms;
                timeout_ms = 30000;

                int8_t state = sendCommand_Blocking("0100");

                if (state == ELM_SUCCESS)
                {
                    timeout_ms = prevTimeout;
                    connected = true;
                    return connected;
                }
                else if (state == ELM_BUFFER_OVERFLOW)
                {
                    while (elm_port->available())
                        elm_port->read();
                }

                timeout_ms = prevTimeout;