 //
 #define PIN_KLINE (12)
 
+#define PIN_LED (13)
 
+
+
+static bool led_state = false;
 
 
 // *****************************************************

{
    pinMode( PIN_RX, INPUT );
    pinMode( PIN_TX, INPUT );

    delay( STARTUP_DELAY );


        const byte rx_byte = (byte) obd_serial.read();

        Serial.write( rx_byte );

        led_state = !led_state;
        digitalWrite( PIN_LED, led_state );
    }
}
