code: def connect(self, *, db=None):
          
          if db:
              self.poll(command="stop")
              self.properties.db_name = db.split(".")[0]
              self.new_state(DeviceFromDB)
          else:
              self._log.warning(
                  "Already connected, provide db arg if you want to connect to db"
              )
docs: A connected device can be switched to 'database mode' where the device will 
          not use the BACnet network but instead obtain its contents from a previously 
          stored database.