/**
  * This action will try to send a shutdown message to the device specified by $_GET['ip'].
  * 
  * @return  void
  */
 public function shutdownAction()
 {
     if (isset($_GET['ip'], $_GET['user'], $_GET['password'])) {
         $output = Devices::shutdown($_GET['ip'], $_GET['user'], $_GET['password']);
         if (isset($output[1])) {
             die(strpos($output[1], 'succeeded') !== false ? "true" : "false");
         }
     }
     die("false");
 }