OpenWrt night light for Xiaomi AX3200

night-light.sh

#!/bin/ash

#set -x

SELF=`basename $0 .sh`

function log() {
	logger -t $SELF -s "$@"
}

board_name=`ubus call system board | jsonfilter -e '@.board_name'`
current_time="$(date +'%s')"

if [ -z ${1} ]; then
	lower_bound="$(date -d '04:00' +'%s')"
else
	lower_bound="$(date -d $1 +'%s')"
fi

if [ -z ${2} ]; then
	upper_bound="$(date -d '21:00' +'%s')"
else
	upper_bound="$(date -d $2 +'%s')"
fi

ACTIVITY_LED=
STATUS_LED=

case "${board_name}" in
	xiaomi,redmi-router-ax6s)
		ACTIVITY_LED='/sys/devices/platform/leds/leds/blue:net'
		STATUS_LED='/sys/devices/platform/leds/leds/blue:power'
		;;
esac

if [ -z ${ACTIVITY_LED} ]; then
	log No activity led, nothing to do
	exit 0
fi

if [ "${current_time}" -ge "${lower_bound}" -a "${current_time}" -lt "${upper_bound}" ]; then
	log setting day light
	service led start
	if hash pingcheck; then
		service pingcheck restart
	fi
	exit 0
fi

log setting night light
# none status
echo none > $ACTIVITY_LED/trigger

# low freq heartbeat
echo timer > $STATUS_LED/trigger
echo 9900 > $STATUS_LED/delay_off
echo 100 > $STATUS_LED/delay_on

Usage: add it to crontab 😉

# crontab -l
2 6,19 * * * /root/night-light.sh 06:00 19:00