Led triggers

Now we explain in detail what each trigger does.

None

The LED is always in default state. Unlisted LED are default OFF, so this is only useful to declare a LED to be always ON.

Timer

The LED blinks with the configured on/off frequency.
If not installed already, install it with:

root@lede:/# opkg install kmod-ledtrig-timer

Default-on
The LED is ON. Deprecated, use default=1 trigger=none instead. If not installed already, install it with:

root@lede:/# opkg install kmod-ledtrig-default-on

Heartbeat
The LED flashes to simulate actual heart beat thump-thump-pause. The frequency is in direct proportion to 1-minute average CPU load. If not installed already, install it with:

root@lede:/# opkg install kmod-ledtrig-heartbeat

Flash Writes
The LED flashes as data is written to flash memory.

Network Activity
The LED flashes with link status and/or send and receive activity on the configured interface. If not installed already, install it with:

root@lede:/# opkg install kmod-ledtrig-netdev

WiFi Activity triggers
The LED flashes on events triggered in physical interface, rather than in software network interface. Besides phy triggers have more events, it also provides possibility of static LED setup in case you want to monitor your 2.4 GHz radio (phy0 usually) and 5 GHz radio (phy1 usually) separately. netdev can’t guarantee this distinguishing since wlan0 may be referring to 2.4 GHz or 5 GHz radio based on current network setup.

• phy0rx - flashes on reception.
• phy0tx - flashes on transmission.
• phy0assoc - flashes on client association.
• phy0radio - (unknown, this option did nothing on my tl-wr1043nd)
• phy0tpt - flashes slowly and steadily on network activity.in comparison to energetic flashes of tx and rx modes
  USB Device
  The LED turns ON if USB device is connected. If not installed already, install it with:

root@lede:/# opkg install kmod-ledtrig-usbdev

To find out device name use logread to search for it or list /sys/bus/usb/devices (for this example, there would be /sys/bus/usb/devices/1-1 device).

Morse Code
The LED signals a message using Morse code. If not installed already, install it with:

root@lede:/# opkg install kmod-ledtrig-morse

GPIO
Allows LEDs to be controlled by gpio events. If not installed already, install it with:

root@lede:/# opkg install kmod-ledtrig-gpio

Net filter
Flash LEDs when a particular packets passing through your machine. If not installed already, install it with:

root@lede:/# opkg install kmod-ipt-led
According to this, the package was named kmod-ledtrig-netfilter in older versions

For example to create an LED trigger for incoming SSH traffic:

root@lede:/# iptables -A INPUT -p tcp --dport 22 -j LED --led-trigger-id ssh --led-delay 1000
Then attach the new trigger to an LED on your system:

root@lede:/# echo netfilter-ssh > /sys/class/leds/<ledname>/trigger

Examples

Please remember to change the sysfs option to LEDs that are actually present on your router.
This can be done easily through LuCI. Following examples are from /etc/config/system file:

Heartbeat led

config 'led'
    option 'sysfs'      'wrt160nl:amber:wps'
    option 'trigger'     'heartbeat'

WLAN led

config 'led' 'wlan_led'
    option 'name'          'WLAN'
    option 'sysfs'           'tl-wr1043nd:green:wlan'
    option 'trigger'        'netdev'
    option 'dev'             'wlan0'
    option 'mode'         'link tx rx'

3G led
This led lights up when an USB-dongle properly registers with the 3G/EDGE/GPRS network.

config 'led'
    option 'name'         '3G'
    option 'sysfs'          'asus:blue:3g'
    option 'trigger'        'netdev'
    option 'dev'             '3g-wan'
    option 'mode'         'link'

Timer led - 500ms ON, 2000ms OFF

config 'led'
    option 'sysfs'        'wrt160nl:blue:wps'
    option 'trigger'      'timer'
    option 'delayon'      '500'
    option 'delayoff'      '2000'

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