#!/bin/sh
echo "Content-type: text/html"
echo ""

x=`cat /sys/class/leds/tp-link:blue:relay/brightness`
                                                      
if [ "$x" -eq 0 ]                                     
then                                                  
        echo "<h1>ON</h1>"                            
        echo 1 > /sys/class/leds/tp-link:blue:relay/brightness 
else
        echo "<h1>OFF</h1>"
        echo 0 > /sys/class/leds/tp-link:blue:relay/brightness        
fi