How to use the pyhik.constants.CAM_DEVICE function in pyHik

"""
                            If we got this far we found an event that we want
                            to track.
                            """
                            events.setdefault(ettype.text, []) \
                                .append(etchannel_num)

        except (AttributeError, ET.ParseError) as err:
            _LOGGING.error(
                'There was a problem finding an element: %s', err)
            return None

        if nvrflag:
            self.device_type = NVR_DEVICE
        else:
            self.device_type = CAM_DEVICE
        _LOGGING.debug('Processed %s as %s Device.',
                       self.cam_id, self.device_type)

        _LOGGING.debug('Found events: %s', events)
        self.hik_request.close()

        # Change back namespace if needed
        if self.temp_namespace is not None:
            self.namespace = self.temp_namespace
            _LOGGING.debug('Changing Namespace: %s', self.namespace)

        return events