openwrt/package/om-watchdog/files/om-watchdog

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#!/bin/sh
GPIO=$1
trap "" INT HUP
echo $GPIO > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio${GPIO}/direction
while true; do
echo 1 > /sys/class/gpio/gpio${GPIO}/value
sleep 1
echo 0 > /sys/class/gpio/gpio${GPIO}/value
sleep 180
done