#!/bin/sh

blueled_fliker(){
	#turn off all the leds
	gpio 1 1
	gpio 2 1
	gpio 3 1

	#blue led flicker
	while true
	do
		gpio 3 0
		usleep 1200000

		gpio 3 1
		usleep 600000
	done
}

#check pid exist
pid_file="/tmp/pid_updateledfliker"
if [ -f $pid_file ]; then
        exist_pid=`cat $pid_file`
        if [ -n $exist_pid ]; then
                kill -0 $exist_pid 2>/dev/null
                if [ $? -eq 0 ]; then
                        exit 1
                else
                        echo $$ > $pid_file
                fi
        else
                echo $$ > $pid_file
        fi
else
        echo $$ > $pid_file
fi

blueled_fliker