docs: def endpoint_2_json(self):
          """
          transform local object to JSON
          :return: JSON object
          """
          LOGGER.debug("Endpoint.endpoint_2_json")
          json_obj = {
              "endpointID": self.id,
              "endpointURL": self.url,
              "endpointParentNodeID": self.parent_node_id,
              "endpointTwinEndpointsID": self.twin_endpoints_id,
              "endpointProperties": self.properties
          }
          return json_obj