code: public boolean removeTimer(VacuumTimer timer) throws CommandExecutionException {
          if (timer == null) throw new CommandExecutionException(CommandExecutionException.Error.INVALID_PARAMETERS);
          JSONArray payload = new JSONArray();
          payload.put(timer.getID());
          return sendOk("del_timer", payload);
      }
docs: Delete a scheduled cleanup.
  @param timer The timer to remove.
  @return True if the command was received successfully.
  @throws CommandExecutionException When there has been a error during the communication or the response was invalid.