"runway lights" for the Xiaomi AX3600 router

ax3600_led_show.sh

#!/bin/sh

PREV=
while :; do
	for a in led_blue net_blue led_ant   led_yellow net_yellow led_ant; do
		[ -n "$PREV" ] && echo 0 > /sys/class/leds/$PREV/brightness
		echo 1 > /sys/class/leds/$a/brightness
		PREV=$a
		sleep 1
	done
done