{
      $hr21 = file_get_contents("hr21.txt");
      echo "\tOverTemperatureRestart 0:Yes 1:No. Was ",$hr21;
      $hr21 = $hex;
      $hr21 = trim($hr21,  " \n\r\t\v\x00");
      file_put_contents("hr21.txt",$hr21);
      }