code: public boolean powerOffAfterTime(int minutes) throws CommandExecutionException {
          JSONArray col = new JSONArray();
          col.put(0);
          col.put(minutes);
          return sendOk("cron_add", col);
      }
docs: Power the device off after some time.
  @param minutes The time until the device is turned off in minutes.
  @return True if the command was received successfully.
  @throws CommandExecutionException When there has been a error during the communication or the response was invalid.