LEDs
====

+-------------------------------+-----------------------------+-------------------+------------------------+-----------------+
| Attribute                     | LED0                        | LED1              | LED2                   | LED3            |
+===============================+=============================+===================+========================+=================+
| Color                         | Red                         | Yellow            | Yellow                 | Green           |
+-------------------------------+-----------------------------+-------------------+------------------------+-----------------+
| Function                      | Heartbeat                   | --                | incoming CAN traffic   | Boot process    |
+-------------------------------+-----------------------------+-------------------+------------------------+-----------------+
| Linux Device /sys/class/leds/ | evse:red:led0               | evse:yellow:led1  | evse:yellow:led2       | evse:green:led3 |
+-------------------------------+-----------------------------+-------------------+------------------------+-----------------+
| Meaning OFF                   | hardware fault or power off | --                | no incoming CAN frames | power off       |
+-------------------------------+-----------------------------+-------------------+------------------------+-----------------+
| Meaning ON                    | --                          | --                | --                     | Boot finished   |
+-------------------------------+-----------------------------+-------------------+------------------------+-----------------+
| Meaning FLASH                 | power on                    | --                | incoming CAN frames    | Booting         |
+-------------------------------+-----------------------------+-------------------+------------------------+-----------------+

The following LED triggers are supported:

- mmc
- timer
- oneshot
- heartbeat
- gpio
- default-on
- transient
- can-tx / can-rx