loop_cnt=0
while :
do
    count=`mmcli -L |grep Modem`
    if [ ${#count} == 0 ]; then
        loop_cnt=$((loop_cnt+1))
        sleep 20
    else
    	break
    fi
    if [ $((loop_cnt)) == 10 ]; then
	   	echo 'modem not found'
    	for i in 0 1 2 3 4 5 6 7 8 9
	do
            echo 255 > /sys/class/leds/app/brightness
            sleep 2
            echo 0 > /sys/class/leds/app/brightness
            sleep 2
    	done
    	echo 255 > /sys/class/leds/app/brightness
    	exit
    fi
done