NBI component - QKD connector:

    def post(self):

        app = request.get_json()['app']

        devices = self.context_client.ListDevices(Empty()).devices

        local_device = None

        local_qkdn_id = app['local_qkdn_id']

        local_qkdn_id = app.get('local_qkdn_id')

        if local_qkdn_id is None:

            MSG = 'local_qkdn_id not specified in qkd_app({:s})'

            msg = MSG.format(str(app))

            LOGGER.exception(msg)

            response = jsonify({'error': msg})

            response.status_code = HTTP_SERVERERROR

            return response

        # This for-loop won't be necessary if Device ID is guaranteed to be the same as QKDN Id

        local_device = None

        for device in devices:

            for config_rule in device.device_config.config_rules:

                if config_rule.custom.resource_key == '__node__':

                if config_rule.custom.resource_key != '__node__': continue

                value = json.loads(config_rule.custom.resource_value)

                    if local_qkdn_id != value['qkdn_id']: continue

                qkdn_id = value.get('qkdn_id')

                if qkdn_id is None: continue

                if local_qkdn_id != qkdn_id: continue

                local_device = device

                break

        if local_device is None:

            MSG = 'Unable to find local_device for local_qkdn_id({:s})'

            MSG = 'Unable to find device for local_qkdn_id({:s})'

            msg = MSG.format(str(local_qkdn_id))

            LOGGER.exception(msg)

            response = jsonify({'error': msg})