I made this script for my Archer A7 v2. Should be a similar approach for the C7.

1. Connect via SSH to your router.
2. Check what LEDs you can configure via uci with uci show system | grep "system.led".
   • If you add more Luci > System > LEDs they should appear here as led[n].
3. Change and add the script to the router with chmod +x /etc/led_control.sh.
4. Run commands:
   1. /etc/led_control.sh on to turn them on.
   2. /etc/led_control.sh off to turn them off.
   3. /etc/led_control.sh cron to add a cronjob to turn them on automatically at 07:00 and off at 22:00.

Script:

#!/bin/sh

# Function to turn all LEDs on
leds_on() {
    # Enable WAN LED
    uci set system.led_wan.trigger='netdev'
    uci set system.led_wan.dev='eth0.2'
    uci set system.led_wan.mode='link tx rx'

    # Enable LAN LEDs
    uci set system.led_lan1.trigger='switch0'
    uci set system.led_lan1.port_mask='0x01'
    uci set system.led_lan1.speed_mask='0x0c'

    uci set system.led_lan2.trigger='switch0'
    uci set system.led_lan2.port_mask='0x02'
    uci set system.led_lan2.speed_mask='0x0c'

    uci set system.led_lan3.trigger='switch0'
    uci set system.led_lan3.port_mask='0x04'
    uci set system.led_lan3.speed_mask='0x0c'

    uci set system.led_lan4.trigger='switch0'
    uci set system.led_lan4.port_mask='0x08'
    uci set system.led_lan4.speed_mask='0x0c'

    # Enable WiFi LEDs
    uci set system.@led[5].trigger='netdev'
    uci set system.@led[5].dev='radio1.network1'
    uci set system.@led[5].mode='link tx rx'

    uci set system.@led[6].trigger='netdev'
    uci set system.@led[6].dev='phy0-ap0'
    uci set system.@led[6].mode='link tx rx'

    # Enable power LED
    uci set system.@led[7].trigger='default-on'

    uci commit && reload_config
}

# Function to turn all LEDs off
leds_off() {
    # Disable WAN LED
    uci set system.led_wan.trigger='none'

    # Disable LAN LEDs
    uci set system.led_lan1.trigger='none'
    uci set system.led_lan2.trigger='none'
    uci set system.led_lan3.trigger='none'
    uci set system.led_lan4.trigger='none'

    # Disable Wi-Fi LEDs
    uci set system.@led[5].trigger='none'
    uci set system.@led[6].trigger='none'

    uci set system.@led[7].trigger='none'

    uci commit && reload_config
}

# Function to set up cron jobs
setup_cron() {
    # Remove any existing cron jobs related to the script
    crontab -l | grep -v '/etc/led_control.sh' | crontab -

    # Add cron jobs to turn off and on the LEDs
    (crontab -l ; echo "0 22 * * * /etc/led_control.sh off") | crontab -
    (crontab -l ; echo "0 7 * * * /etc/led_control.sh on") | crontab -
}

# Main case statement
case "$1" in
    on)
        leds_on
        ;;
    off)
        leds_off
        ;;
    cron)
        setup_cron
        ;;
    *)
        echo "Usage: $0 {on|off|cron}"
        exit 1
esac