code: def clear_data(self):
          
          command = const.CMD_CLEAR_DATA
          command_string = ''
          cmd_response = self.__send_command(command, command_string)
          if cmd_response.get('status'):
              self.is_connect = False
              self.next_uid = 1
              return True
          else:
              raise ZKErrorResponse("can't clear data")
docs: clear all data (included: user, attendance report, finger database)
  
          :return: bool