Fix xr service handler for cases where XR constellation is represented as single device

    ) -> List[Union[bool, Exception]]:

        chk_type('endpoints', endpoints, list)

        # When using regular mode where XR constellation is a single device, we get two endpoints.

        # Convert that representation to a form that is understood by the service handler that

        # expects constellation to be represented as multiple devices.

        if len(endpoints) == 2:

            endpoints = [None, endpoints[0], endpoints[1], None]

        if len(endpoints) != 4: return []

        service_uuid = self.__service.service_id.service_uuid.uuid

                raise Exception('Different Src-Dst devices not supported by now')

            controller = src_controller

            # If the special mode that splits XR constellation to multiple modelled devices is used,

            # add the device name to interface name. Otherwise use it as is (it will already contain pipe character

            # end edge device name). This code should be refactored, as interface name structure is internal matter

            # to XR driver and subject to change.

            constellation_unique_src =  src_endpoint.name if "|" in src_endpoint.name else '|'.join([src_device.name, src_endpoint.name])

            constellation_unique_dst =  dst_endpoint.name if "|" in dst_endpoint.name else '|'.join([dst_device.name, dst_endpoint.name])

            json_config_rule = json_config_rule_set('/services/service[{:s}]'.format(service_uuid), {

                'uuid'           : service_uuid,

                'input_sip_name' : '|'.join([src_device.name, src_endpoint.name]),

                'output_sip_name': '|'.join([dst_device.name, dst_endpoint.name]),

                'input_sip_name' : constellation_unique_src,

                'output_sip_name': constellation_unique_dst,

                'capacity_unit'  : capacity_unit,

                'capacity_value' : capacity_value,

            })