//This is my read event callback called by libevent

static void cmd_read(int fd, short evtype, void *arg) {
    if (!(evtype & EV_READ)) {
        log(LOG_ERR, "Unknown event type in read callback: 0x%hx", evtype);
        return;
    }

    char buf[16] = { 0 };

    //This method does a standard read until a \n is found which is my
    //end of the message from the arduino
    serialport_read_until(fd, buf, '\n');

    //The message must start with 'XA' characters
    if (buf[0] != 'X' && buf[1] != 'A')
        return;

    //TODO parse the command and data here

    //Print the entire message to the screen
    log(LOG_INFO, "Str: %s", buf);
}