A Semantic Definition Format for Data and Interactions of ThingsR. Mohan Internet-Draft B. Brinckman Intended status: Standards Track Cisco Systems Expires: 12 February 2027 L. Corneo Ericsson 11 August 2026 SDF Protocol Mapping draft-ietf-asdf-sdf-protocol-mapping-10 Abstract This document defines protocol mapping extensions for the Semantic Definition Format (SDF) to enable mapping of protocol-agnostic SDF affordances to protocol-specific operations. The protocol mapping mechanism allows SDF models to specify how properties, actions, and events should be accessed using a specific protocol. This document defines protocol mappings for Bluetooth Low Energy and Zigbee, and the mechanism can be extended to other protocols such as HTTP and CoAP. This document also describes a method to extend SCIM with an SDF model mapping. About This Document This note is to be removed before publishing as an RFC. Status information for this document may be found at https://datatracker.ietf.org/doc/draft-ietf-asdf-sdf-protocol- mapping/. Discussion of this document takes place on the A Semantic Definition Format for Data and Interactions of Things Working Group mailing list (mailto:asdf@ietf.org), which is archived at https://mailarchive.ietf.org/arch/browse/asdf/. Subscribe at https://www.ietf.org/mailman/listinfo/asdf/. Source for this draft and an issue tracker can be found at https://github.com/ietf-wg-asdf/sdf-protocol-mapping. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Mohan, et al. Expires 12 February 2027 [Page 1] Internet-Draft sdf-protocol-mapping August 2026 Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 12 February 2027. Copyright Notice Copyright (c) 2026 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Conventions and Definitions . . . . . . . . . . . . . . . . . 4 3. SDF Protocol Mapping Structure . . . . . . . . . . . . . . . 4 3.1. SDF Extension Points . . . . . . . . . . . . . . . . . . 5 3.1.1. Property Extension . . . . . . . . . . . . . . . . . 5 3.1.2. Action Extension . . . . . . . . . . . . . . . . . . 7 3.1.3. Event Extension . . . . . . . . . . . . . . . . . . . 8 4. New Protocol Registration Procedure . . . . . . . . . . . . . 9 5. Registered Protocol Mappings . . . . . . . . . . . . . . . . 10 5.1. BLE . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5.1.1. Properties . . . . . . . . . . . . . . . . . . . . . 10 5.1.2. Events . . . . . . . . . . . . . . . . . . . . . . . 11 5.2. Zigbee . . . . . . . . . . . . . . . . . . . . . . . . . 13 5.2.1. Properties . . . . . . . . . . . . . . . . . . . . . 13 5.2.2. Events . . . . . . . . . . . . . . . . . . . . . . . 14 5.2.3. Actions . . . . . . . . . . . . . . . . . . . . . . . 17 6. SCIM SDF Extension . . . . . . . . . . . . . . . . . . . . . 18 7. Security Considerations . . . . . . . . . . . . . . . . . . . 20 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20 8.1. Protocol Mapping . . . . . . . . . . . . . . . . . . . . 20 Mohan, et al. Expires 12 February 2027 [Page 2] Internet-Draft sdf-protocol-mapping August 2026 8.2. SCIM Device Schema SDF Extension . . . . . . . . . . . . 21 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 21 9.1. Normative References . . . . . . . . . . . . . . . . . . 21 9.2. Informative References . . . . . . . . . . . . . . . . . 22 Appendix A. CDDL Definition . . . . . . . . . . . . . . . . . . 23 Appendix B. OpenAPI Definition . . . . . . . . . . . . . . . . . 25 B.1. Protocol map for BLE . . . . . . . . . . . . . . . . . . 26 B.2. Protocol map for Zigbee . . . . . . . . . . . . . . . . . 28 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 33 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 33 1. Introduction The Semantic Definition Format (SDF) [RFC9880] provides a protocol- agnostic way to describe IoT devices and their capabilities through properties, actions, and events (collectively called affordances). A device described by an SDF model, however, is accessed over a specific communication protocol. To interact with such a device based on its SDF model, there needs to be a mechanism to map the protocol-agnostic SDF definitions to the protocol-specific operations that access the device. Moreover, such a mechanism needs to be extensible for enabling implementers to provide novel SDF protocol mappings to expand the SDF ecosystem. SDF protocol mappings may target a variety of protocols spanning from non-IP protocols commonly used in IoT environments, such as [BLE53] and [Zigbee30], to IP-based protocols such as HTTP [RFC9110] and CoAP [RFC7252]. This document provides the required mechanism by defining: * The sdfProtocolMap quality, which allows SDF models to include protocol-specific mapping information attached to the protocol- agnostic definitions, see Section 3. An sdfProtocolMap MAY be applied to an SDF affordance, be it an sdfProperty, sdfEvent or sdfAction. The mapping enables use cases such as application gateways or multi-protocol gateways that translate between different IoT protocols, automated generation of protocol-specific implementations from SDF models, and interoperability across heterogeneous device ecosystems. * Two SDF protocol mappings for Bluetooth and Zigbee protocols, see Section 5.1 and Section 5.2 respectively. * An SDF model extension for SCIM. While SDF provides a way to describe a class of devices, SCIM describes a device instance. The SDF model extension for SCIM enables the inclusion of SDF models for the class of devices a device belongs to in the SCIM object, see Section 6. Mohan, et al. Expires 12 February 2027 [Page 3] Internet-Draft sdf-protocol-mapping August 2026 * An IANA registry for defining additional SDF protocol mappings (in addition to the BLE and Zigbee provided in this document), see Section 8.1. 2. Conventions and Definitions The syntax extensions to [RFC9880] are shown in the Concise Data Definition Language (CDDL) [RFC8610], which describes their JSON representation. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 3. SDF Protocol Mapping Structure This section defines the structure of an sdfProtocolMap. Because each protocol has its own addressing model, a single SDF affordance requires a distinct mapping per protocol. For example, BLE addresses a property as a service characteristic, while Zigbee addresses it as an attribute in a cluster of an endpoint. The value of the sdfProtocolMap quality is a JSON object nested inside an SDF affordance definition (sdfProperty, sdfAction, or sdfEvent). Protocol-specific attributes are embedded within this object, keyed by a protocol name registered in the IANA "SDF Protocol Mapping" registry (Section 8.1), e.g., "ble" or "zigbee". sdfProperty / sdfAction / sdfEvent | +-----> sdfProtocolMap | +-----> ble | | | +--> BLE-specific mapping | +-----> zigbee | | | +--> Zigbee-specific mapping | +-----> ... Figure 1: SDF Protocol Mapping Structure Mohan, et al. Expires 12 February 2027 [Page 4] Internet-Draft sdf-protocol-mapping August 2026 3.1. SDF Extension Points The sdfProtocolMap quality is introduced into SDF affordance definitions through the extension points defined in the formal syntax of Appendix A of [RFC9880]. For each affordance type, an sdfProtocolMap entry is added via the corresponding CDDL group socket. The contents of the sdfProtocolMap object are in turn extensible through a protocol-mapping-specific group socket. A protocol MAY choose to extend only the affordance types that are applicable to it. For example, the BLE protocol mapping defines extensions for properties and events but not for actions. 3.1.1. Property Extension The $$SDF-EXTENSION-PROPERTY group socket in the propertyqualities rule of Appendix A of [RFC9880] is used to add protocol mapping to sdfProperty definitions: $$SDF-EXTENSION-PROPERTY //= ( sdfProtocolMap: { * $$SDF-PROPERTY-PROTOCOL-MAP } ) property-protocol-map = ( name => props / { read: read-props, write: write-props } ) Figure 2: SDF Property Extension Point for Protocol Mapping The property-protocol-map generic (Figure 2) captures the common structure of property protocol mappings. The name parameter is the protocol name and props is the protocol-specific map of attributes. A protocol can provide either: * A single mapping that applies to both read and write operations, or * Separate read and write mappings when the protocol uses different attributes for each direction. To keep these two forms unambiguous, the protocol-specific attribute map (the props type) MUST NOT define members named read or write. Mohan, et al. Expires 12 February 2027 [Page 5] Internet-Draft sdf-protocol-mapping August 2026 To extend $$SDF-PROPERTY-PROTOCOL-MAP for a new protocol (e.g., "new- protocol"), implementers MUST use the property-protocol-map generic with the protocol name and a map type defining the protocol-specific attributes. It is to be noted that the protocol name (e.g., "new-protocol") MUST be registered in the IANA registry defined in Section 8.1. For example: =============== NOTE: '\' line wrapping per RFC 8792 ================ $$SDF-PROPERTY-PROTOCOL-MAP //= ( property-protocol-map<"new-protocol", new-protocol-property, new-\ protocol-property, new-protocol-property> ) new-protocol-property = { attributeA: text, attributeB: uint } Figure 3: Example Property Protocol Map Extension An SDF model using this extension could look like: { "sdfProperty": { "temperature": { "type": "number", "unit": "Cel", "sdfProtocolMap": { "new-protocol": { "attributeA": "temperature-service", "attributeB": 1 } } } } } Figure 4: Example Property Protocol Map in JSON When a property uses different protocol attributes for read and write operations, the mapping can be split: Mohan, et al. Expires 12 February 2027 [Page 6] Internet-Draft sdf-protocol-mapping August 2026 { "sdfProperty": { "temperature": { "type": "number", "unit": "Cel", "sdfProtocolMap": { "new-protocol": { "read": { "attributeA": "temperature-read-service", "attributeB": 1 }, "write": { "attributeA": "temperature-write-service", "attributeB": 2 } } } } } } Figure 5: Example Property Protocol Map with Read/Write in JSON 3.1.2. Action Extension The $$SDF-EXTENSION-ACTION group socket in the actionqualities rule of Appendix A of [RFC9880] is used to add protocol mapping to sdfAction definitions: $$SDF-EXTENSION-ACTION //= ( sdfProtocolMap: { * $$SDF-ACTION-PROTOCOL-MAP } ) Figure 6: SDF Action Extension Point for Protocol Mapping Actions use a simpler structure than properties, as they do not require the read/write distinction. To extend $$SDF-ACTION-PROTOCOL- MAP for a new protocol, implementers MUST add a group entry that maps the protocol name to the protocol-specific attributes. For example, an extension for a fictitious "new-protocol" could be defined as: Mohan, et al. Expires 12 February 2027 [Page 7] Internet-Draft sdf-protocol-mapping August 2026 $$SDF-ACTION-PROTOCOL-MAP //= ( "new-protocol": new-protocol-action ) new-protocol-action = { commandID: uint } Figure 7: Example Action Protocol Map Extension An SDF model using this extension could look like: { "sdfAction": { "reset": { "sdfProtocolMap": { "new-protocol": { "commandID": 42 } } } } } Figure 8: Example Action Protocol Map in JSON 3.1.3. Event Extension The $$SDF-EXTENSION-EVENT group socket in the eventqualities rule of Appendix A of [RFC9880] is used to add protocol mapping to sdfEvent definitions: $$SDF-EXTENSION-EVENT //= ( sdfProtocolMap: { * $$SDF-EVENT-PROTOCOL-MAP } ) Figure 9: SDF Event Extension Point for Protocol Mapping Events follow the same simple pattern as actions. To extend $$SDF- EVENT-PROTOCOL-MAP for a new protocol, implementers add a group entry that maps the protocol name to the protocol-specific attributes. For example, an extension for a fictitious "new-protocol" could be defined as: Mohan, et al. Expires 12 February 2027 [Page 8] Internet-Draft sdf-protocol-mapping August 2026 $$SDF-EVENT-PROTOCOL-MAP //= ( "new-protocol": new-protocol-event ) new-protocol-event = { eventID: uint } Figure 10: Example Event Protocol Map Extension An SDF model using this extension could look like: { "sdfEvent": { "alert": { "sdfProtocolMap": { "new-protocol": { "eventID": 3 } } } } } Figure 11: Example Event Protocol Map in JSON 4. New Protocol Registration Procedure Protocol names used as keys in the sdfProtocolMap object (e.g., "ble", "zigbee") MUST be registered in the IANA registry defined in Section 8.1. A new SDF protocol mapping MUST be defined by a specification that mandatorily includes: * A CDDL definition that extends at least one of the group sockets defined in this document: $$SDF-PROPERTY-PROTOCOL-MAP (Section 3.1.1), $$SDF-ACTION-PROTOCOL-MAP (Section 3.1.2), or $$SDF-EVENT-PROTOCOL-MAP (Section 3.1.3). Property mappings MUST use the property-protocol-map generic (Section 3.1.1) to ensure a consistent structure. * A description of the protocol-specific attributes introduced by the CDDL extension, including their semantics and how they relate to the underlying protocol operations. Mohan, et al. Expires 12 February 2027 [Page 9] Internet-Draft sdf-protocol-mapping August 2026 5. Registered Protocol Mappings This section defines the protocol mappings registered by this document. 5.1. BLE The BLE protocol mapping allows SDF models to specify how properties and events should be accessed using Bluetooth Low Energy (BLE) protocol [BLE53]. The mapping includes details such as service IDs and characteristic IDs that are used to access the corresponding SDF affordances. 5.1.1. Properties For sdfProperty, the BLE protocol mapping structure is defined as follows: =============== NOTE: '\' line wrapping per RFC 8792 ================ $$SDF-PROPERTY-PROTOCOL-MAP //= ( property-protocol-map<"ble", ble-property, ble-property, ble-\ property> ) ble-property = { serviceID: text, characteristicID: text } Figure 12: CDDL definition for BLE Protocol Mapping for sdfProperty Where: * serviceID is the BLE service ID that corresponds to the SDF property. * characteristicID is the BLE characteristic ID that corresponds to the SDF property. For example, a BLE protocol mapping for a temperature property: Mohan, et al. Expires 12 February 2027 [Page 10] Internet-Draft sdf-protocol-mapping August 2026 { "sdfProperty": { "temperature": { "sdfProtocolMap": { "ble": { "serviceID": "00001809-0000-1000-8000-00805f9b34fb", "characteristicID": "00002a1c-0000-1000-8000-00805f9b34fb" } } } } } For a temperature property that has different mappings for read and write operations, here is an example of the BLE protocol mapping: =============== NOTE: '\' line wrapping per RFC 8792 ================ { "sdfProperty": { "temperature": { "sdfProtocolMap": { "ble": { "read": { "serviceID": "00001809-0000-1000-8000-00805f9b34fb", "characteristicID": "00002a1c-0000-1000-8000-\ 00805f9b34fb" }, "write": { "serviceID": "00001809-0000-1000-8000-00805f9b34fb", "characteristicID": "00002a51-0000-1000-8000-\ 00805f9b34fb" } } } } } } 5.1.2. Events For sdfEvents, the BLE protocol mapping structure is similar to sdfProperties, but it MUST include additional attributes such as the type of the event. Mohan, et al. Expires 12 February 2027 [Page 11] Internet-Draft sdf-protocol-mapping August 2026 $$SDF-EVENT-PROTOCOL-MAP //= ( ble: ble-event-map ) ble-event-map = { type: "gatt", serviceID: text, characteristicID: text } / { type: "advertisements" } / { type: "connection_events" } Figure 13: BLE Protocol Mapping for sdfEvents Where: * type specifies the type of BLE event, such as "gatt" for GATT events, "advertisements" for advertisement events, or "connection_events" for connection-related events. * serviceID and characteristicID identify the GATT service and characteristic. They MUST be present when type is "gatt", and MUST be absent when type is "advertisements" or "connection_events". For example, a BLE event mapping for a heart rate measurement event: { "sdfEvent": { "heartRate": { "sdfProtocolMap": { "ble": { "type": "gatt", "serviceID": "0000180d-0000-1000-8000-00805f9b34fb", "characteristicID": "00002a37-0000-1000-8000-00805f9b34fb" } } } } } Here is an example of an isPresent event using BLE advertisements: Mohan, et al. Expires 12 February 2027 [Page 12] Internet-Draft sdf-protocol-mapping August 2026 { "sdfEvent": { "isPresent": { "sdfProtocolMap": { "ble": { "type": "advertisements" } } } } } 5.2. Zigbee The Zigbee protocol mapping allows SDF models to specify how properties, actions, and events should be accessed using the Zigbee protocol [Zigbee30]. The mapping includes details such as cluster IDs and attribute IDs that are used to access the corresponding SDF affordances. 5.2.1. Properties An sdfProperty is mapped to a Zigbee cluster attribute. The Zigbee property protocol mapping structure is defined as follows: =============== NOTE: '\' line wrapping per RFC 8792 ================ $$SDF-PROPERTY-PROTOCOL-MAP //= ( property-protocol-map<"zigbee", zigbee-property, zigbee-property, \ zigbee-property> ) zigbee-property = { endpointID: uint, clusterID: uint, attributeID: uint, attributeType: uint, ? profileID: uint, ? manufacturerCode: uint, } Figure 14: CDDL definition for Zigbee Protocol Mapping for sdfProperty Where: * endpointID is the Zigbee endpoint ID that corresponds to the SDF property. Mohan, et al. Expires 12 February 2027 [Page 13] Internet-Draft sdf-protocol-mapping August 2026 * clusterID is the Zigbee cluster ID that corresponds to the SDF property. * attributeID is the Zigbee attribute ID that corresponds to the SDF property. * attributeType is the Zigbee data type of the attribute. * profileID is the Zigbee application profile ID (optional). If not provided, it defaults to the Home Automation profile (0x0104), which is the default profile in Zigbee 3.0. * manufacturerCode is the Zigbee manufacturer code of the attribute (optional). For example, a Zigbee protocol mapping for a temperature property may look as follows: { "sdfProperty": { "temperature": { "sdfProtocolMap": { "zigbee": { "endpointID": 1, "clusterID": 1026, "attributeID": 0, "attributeType": 41, "profileID": 260 } } } } } 5.2.2. Events An sdfEvent is mapped to a Zigbee cluster event such as attribute reporting or a device-initiated write to an attribute on the gateway. The Zigbee event protocol mapping structure is defined as follows. The "attribute_reporting" and "write_event" variants reuse the zigbee-property definition from Figure 14 to identify the underlying Zigbee attribute: Mohan, et al. Expires 12 February 2027 [Page 14] Internet-Draft sdf-protocol-mapping August 2026 =============== NOTE: '\' line wrapping per RFC 8792 ================ $$SDF-EVENT-PROTOCOL-MAP //= ( zigbee: zigbee-event-map ) zigbee-event-map = zigbee-attribute-reporting / zigbee-write-event \ / zigbee-connection-event zigbee-attribute-reporting = { type: "attribute_reporting", ~zigbee-property, ? minReportingInterval: uint, ? maxReportingInterval: uint, ? reportableChange: number, } zigbee-write-event = { type: "write_event", ~zigbee-property, } zigbee-connection-event = { type: "connection_events", } Figure 15: CDDL definition for Zigbee Protocol Mapping for sdfEvents Where: * type is the type of Zigbee event. It MUST be one of: - "attribute_reporting": the event is triggered by Zigbee attribute reporting. - "write_event": the event is triggered by the device writing to an attribute on the gateway. - "connection_events": the event is triggered when a Zigbee end device joins or leaves the Zigbee network. * endpointID, clusterID, attributeID, attributeType, profileID, and manufacturerCode have the same meaning as described for sdfProperty in Figure 14. These fields are present when type is "attribute_reporting" or "write_event", and MUST be absent when type is "connection_events". Mohan, et al. Expires 12 February 2027 [Page 15] Internet-Draft sdf-protocol-mapping August 2026 * minReportingInterval is the minimum reporting interval in seconds (optional). It is the minimum time between issued attribute reports and only applies when type is "attribute_reporting". * maxReportingInterval is the maximum reporting interval in seconds (optional). It is the maximum time between issued attribute reports and only applies when type is "attribute_reporting". * reportableChange is the minimum change to the attribute value that triggers a report (optional). It only applies when type is "attribute_reporting" and to attributes whose attributeType is one of the "analog" data types defined by the Zigbee Cluster Library, part of [Zigbee30] (e.g., unsigned and signed integers, floating point numbers), as opposed to "discrete" data types (e.g., booleans, enumerations, bitmaps), for which reporting a minimum change is not meaningful. The encoded value MUST use the same Zigbee data type as the reported attribute's attributeType. For example, a Zigbee event mapping for a temperature change report: { "sdfEvent": { "temperatureChange": { "sdfProtocolMap": { "zigbee": { "type": "attribute_reporting", "profileID": 260, "endpointID": 1, "clusterID": 1026, "attributeID": 0, "attributeType": 41, "minReportingInterval": 10, "maxReportingInterval": 300, "reportableChange": 50 } } } } } Here is an example of an isPresent event using Zigbee connection events: Mohan, et al. Expires 12 February 2027 [Page 16] Internet-Draft sdf-protocol-mapping August 2026 { "sdfEvent": { "isPresent": { "sdfProtocolMap": { "zigbee": { "type": "connection_events" } } } } } 5.2.3. Actions An sdfAction is mapped to a Zigbee cluster command. The Zigbee protocol mapping structure for actions is defined as follows: $$SDF-ACTION-PROTOCOL-MAP //= ( zigbee: zigbee-action-map ) zigbee-action-map = { endpointID: uint, clusterID: uint, commandID: uint, ? profileID: uint, ? manufacturerCode: uint, } Figure 16: CDDL definition for Zigbee Protocol Mapping for sdfAction Where: * endpointID is the Zigbee endpoint ID that corresponds to the SDF action. * clusterID is the Zigbee cluster ID that corresponds to the SDF action. * commandID is the Zigbee command ID that corresponds to the SDF action. * profileID is the Zigbee application profile ID (optional). If not provided, it defaults to the Home Automation profile (0x0104), which is the default profile in Zigbee 3.0. * manufacturerCode is the Zigbee manufacturer code of the command (optional). Mohan, et al. Expires 12 February 2027 [Page 17] Internet-Draft sdf-protocol-mapping August 2026 For example, a Zigbee protocol mapping to set a temperature: { "sdfAction": { "setTemperature": { "sdfProtocolMap": { "zigbee": { "profileID": 260, "endpointID": 1, "clusterID": 1026, "commandID": 0 } } } } } 6. SCIM SDF Extension While SDF provides a way to describe a device class and SCIM defines a device instance, a method is needed to associate a mapping between an instance of a device and its associated SDF models. To accomplish so, this document defines a SCIM extension that MAY be used in conjunction with [RFC9944] in Figure 17. Implementation of this SCIM extension is OPTIONAL and independent of the protocol mapping functionality defined in the rest of this document. The SCIM schema attributes used here are described in Section 7 of [RFC7643]. Mohan, et al. Expires 12 February 2027 [Page 18] Internet-Draft sdf-protocol-mapping August 2026 =============== NOTE: '\' line wrapping per RFC 8792 ================ { "id": "urn:ietf:params:scim:schemas:extension:sdf:2.0:Device", "name": "SDFExtension", "description": "Device extension schema for SDF.", "attributes": [ { "name": "sdf", "type": "string", "description": "SDF models supported by the device.", "multiValued": true, "required": true, "caseExact": true, "mutability": "readWrite", "returned": "default", "uniqueness": "none" } ], "meta": { "resourceType": "Schema", "location": "/v2/Schemas/urn:ietf:params:scim:schemas:\ extension:sdf:2.0:Device" } } Figure 17: SCIM SDF Extension Schema Here is an example SCIM device schema extension with SDF models: { "schemas": [ "urn:ietf:params:scim:schemas:core:2.0:Device", "urn:ietf:params:scim:schemas:extension:sdf:2.0:Device" ], "id": "e9e30dba-f08f-4109-8486-d5c6a3316111", "displayName": "Heart Monitor", "active": true, "urn:ietf:params:scim:schemas:extension:sdf:2.0:Device": { "sdf": [ "https://example.com/thermometer#/sdfThing/thermometer", "https://example.com/heartrate#/sdfObject/healthsensor" ] } } An SDF model MUST be referenced with the sdf keyword inside the SCIM device schema as described in [RFC9944]. Mohan, et al. Expires 12 February 2027 [Page 19] Internet-Draft sdf-protocol-mapping August 2026 7. Security Considerations The security considerations of [RFC9880] apply to this document as well. Each protocol mapped using this mechanism has its own security model. The protocol mapping mechanism defined in this document does not provide additional security beyond what is offered by the underlying protocols. Implementations MUST ensure that appropriate protocol- level security mechanisms are employed when accessing affordances through the mapped protocol operations. 8. IANA Considerations This section provides guidance to the Internet Assigned Numbers Authority (IANA) regarding registration of values related to this document, in accordance with [RFC8126]. 8.1. Protocol Mapping IANA is requested to create a new registry called "SDF Protocol Mapping" in the "Semantic Definition Format (SDF)" registry group [IANA.sdf], with the following template: * Protocol map name, as per sdfProtocolMap * Protocol name * Description * Reference of the specification describing the protocol mapping. The registration policy for this registry is "Specification Required" as defined in Section 4.6 of [RFC8126]. The specification requirements for a registration request are defined in Section 4. The designated expert(s) MUST verify that the protocol map name is appropriate and not likely to cause confusion with existing entries. The registrant of an existing entry may request updates to that entry, subject to the same expert review. They should verify that updates preserve backward compatibility with deployed implementations, or if breaking changes are necessary, consider whether a new registry entry is more appropriate. The following protocol mappings are described in this document: Mohan, et al. Expires 12 February 2027 [Page 20] Internet-Draft sdf-protocol-mapping August 2026 +==========+===============+====================+================+ | Protocol | Protocol Name | Description | Reference | | Map Name | | | | +==========+===============+====================+================+ | ble | Bluetooth Low | Protocol mapping | This document, | | | Energy (BLE) | for BLE devices | Section 5.1 | +----------+---------------+--------------------+----------------+ | zigbee | Zigbee | Protocol mapping | This document, | | | | for Zigbee devices | Section 5.2 | +----------+---------------+--------------------+----------------+ Table 1: Protocol Mapping Registry 8.2. SCIM Device Schema SDF Extension IANA is requested to create the following extension in the "SCIM Server-Related Schema URIs" registry, within the "System for Cross- domain Identity Management (SCIM) Schema URIs" registry group [IANA.scim], as described in Section 6: +=======================+=============+==========+===========+ | URN | Description | Resource | Reference | | | | Type | | +=======================+=============+==========+===========+ | urn:ietf:params:scim: | SDF | Device | This | | schemas:extension: | Extension | | document, | | sdf:2.0:Device | | | Section 6 | +-----------------------+-------------+----------+-----------+ Table 2: SCIM Device Schema SDF Extension 9. References 9.1. Normative References [IANA.scim] IANA, "System for Cross-domain Identity Management (SCIM) Schema URIs", . [IANA.sdf] IANA, "Semantic Definition Format (SDF)", . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . Mohan, et al. Expires 12 February 2027 [Page 21] Internet-Draft sdf-protocol-mapping August 2026 [RFC7643] Hunt, P., Ed., Grizzle, K., Wahlstroem, E., and C. Mortimore, "System for Cross-domain Identity Management: Core Schema", RFC 7643, DOI 10.17487/RFC7643, September 2015, . [RFC8126] Cotton, M., Leiba, B., and T. Narten, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 8126, DOI 10.17487/RFC8126, June 2017, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8610] Birkholz, H., Vigano, C., and C. Bormann, "Concise Data Definition Language (CDDL): A Notational Convention to Express Concise Binary Object Representation (CBOR) and JSON Data Structures", RFC 8610, DOI 10.17487/RFC8610, June 2019, . [RFC9880] Koster, M., Ed., Bormann, C., Ed., and A. Keränen, "Semantic Definition Format (SDF) for Data and Interactions of Things", RFC 9880, DOI 10.17487/RFC9880, January 2026, . [RFC9944] Shahzad, M., Iqbal, H., and E. Lear, "Device Schema Extensions to the System for Cross-Domain Identity Management (SCIM) Model", RFC 9944, DOI 10.17487/RFC9944, May 2026, . 9.2. Informative References [BLE53] Bluetooth SIG, "Bluetooth Core Specification Version 5.3", 13 July 2021, . [RFC7252] Shelby, Z., Hartke, K., and C. Bormann, "The Constrained Application Protocol (CoAP)", RFC 7252, DOI 10.17487/RFC7252, June 2014, . [RFC9110] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke, Ed., "HTTP Semantics", STD 97, RFC 9110, DOI 10.17487/RFC9110, June 2022, . Mohan, et al. Expires 12 February 2027 [Page 22] Internet-Draft sdf-protocol-mapping August 2026 [Zigbee30] CSA IoT, "Zigbee 3.0 Specification", 2026, . Appendix A. CDDL Definition This appendix contains the combined CDDL definitions for the SDF protocol mappings. file "sdf-protocol-map.cddl" =============== NOTE: '\' line wrapping per RFC 8792 ================ $$SDF-EXTENSION-PROPERTY //= ( sdfProtocolMap: { * $$SDF-PROPERTY-PROTOCOL-MAP } ) property-protocol-map = ( name => props / { read: read-props, write: write-props } ) $$SDF-EXTENSION-ACTION //= ( sdfProtocolMap: { * $$SDF-ACTION-PROTOCOL-MAP } ) $$SDF-EXTENSION-EVENT //= ( sdfProtocolMap: { * $$SDF-EVENT-PROTOCOL-MAP } ) $$SDF-PROPERTY-PROTOCOL-MAP //= ( property-protocol-map<"ble", ble-property, ble-property, ble-\ property> ) ble-property = { serviceID: text, characteristicID: text } $$SDF-EVENT-PROTOCOL-MAP //= ( Mohan, et al. Expires 12 February 2027 [Page 23] Internet-Draft sdf-protocol-mapping August 2026 ble: ble-event-map ) ble-event-map = { type: "gatt", serviceID: text, characteristicID: text } / { type: "advertisements" } / { type: "connection_events" } $$SDF-PROPERTY-PROTOCOL-MAP //= ( property-protocol-map<"zigbee", zigbee-property, zigbee-property, \ zigbee-property> ) zigbee-property = { endpointID: uint, clusterID: uint, attributeID: uint, attributeType: uint, ? profileID: uint, ? manufacturerCode: uint, } $$SDF-EVENT-PROTOCOL-MAP //= ( zigbee: zigbee-event-map ) zigbee-event-map = zigbee-attribute-reporting / zigbee-write-event \ / zigbee-connection-event zigbee-attribute-reporting = { type: "attribute_reporting", ~zigbee-property, ? minReportingInterval: uint, ? maxReportingInterval: uint, ? reportableChange: number, } zigbee-write-event = { type: "write_event", ~zigbee-property, } zigbee-connection-event = { type: "connection_events", } $$SDF-ACTION-PROTOCOL-MAP //= ( Mohan, et al. Expires 12 February 2027 [Page 24] Internet-Draft sdf-protocol-mapping August 2026 zigbee: zigbee-action-map ) zigbee-action-map = { endpointID: uint, clusterID: uint, commandID: uint, ? profileID: uint, ? manufacturerCode: uint, } Figure 18: CDDL for SDF protocol mappings Appendix B. OpenAPI Definition The following non-normative model is provided for convenience of the implementer. file "ProtocolMap.yaml" =============== NOTE: '\' line wrapping per RFC 8792 ================ openapi: 3.0.3 info: title: SDF Protocol Mapping description: |- SDF Protocol Mapping. When adding a new protocol mapping please add a reference to the protocol map for all the schemas in this file. version: 0.10.0 externalDocs: description: SDF Protocol Mapping IETF draft url: https://datatracker.ietf.org/doc/draft-ietf-asdf-sdf-protocol\ -mapping/ paths: {} components: schemas: ## Protocol Map for a property ProtocolMap-Property: type: object properties: sdfProtocolMap: oneOf: - $ref: './ProtocolMap-BLE.yaml#/components/schemas/\ ProtocolMap-BLE-Propmap' - $ref: './ProtocolMap-Zigbee.yaml#/components/schemas/\ Mohan, et al. Expires 12 February 2027 [Page 25] Internet-Draft sdf-protocol-mapping August 2026 ProtocolMap-Zigbee-Propmap' ## Protocol Map for an event ProtocolMap-Event: type: object properties: sdfProtocolMap: oneOf: - $ref: './ProtocolMap-BLE.yaml#/components/schemas/\ ProtocolMap-BLE-Event' - $ref: './ProtocolMap-Zigbee.yaml#/components/schemas/\ ProtocolMap-Zigbee-Event' ## Protocol Map for an action ProtocolMap-Action: type: object properties: sdfProtocolMap: oneOf: - $ref: './ProtocolMap-Zigbee.yaml#/components/schemas/\ ProtocolMap-Zigbee-Action' Figure 19: OpenAPI model B.1. Protocol map for BLE file "ProtocolMap-BLE.yaml" =============== NOTE: '\' line wrapping per RFC 8792 ================ openapi: 3.0.3 info: title: SDF Protocol Mapping for BLE description: |- SDF Protocol Mapping for BLE devices. version: 0.10.0 externalDocs: description: SDF Protocol Mapping IETF draft url: https://datatracker.ietf.org/doc/draft-ietf-asdf-sdf-protocol\ -mapping/ paths: {} components: schemas: ## Protocol Mapping for BLE Property ProtocolMap-BLE-Propmap: required: Mohan, et al. Expires 12 February 2027 [Page 26] Internet-Draft sdf-protocol-mapping August 2026 - ble type: object properties: ble: oneOf: - $ref: '#/components/schemas/BLE-Property' - type: object required: - read - write properties: read: $ref: '#/components/schemas/BLE-Property' write: $ref: '#/components/schemas/BLE-Property' ## Reusable BLE property object BLE-Property: required: - serviceID - characteristicID type: object properties: serviceID: type: string format: uuid example: 00001809-0000-1000-8000-00805f9b34fb characteristicID: type: string format: uuid example: 00002a1c-0000-1000-8000-00805f9b34fb ## Defines different types of BLE events ProtocolMap-BLE-Event: required: - ble type: object properties: ble: oneOf: - type: object required: - type - serviceID - characteristicID properties: type: type: string Mohan, et al. Expires 12 February 2027 [Page 27] Internet-Draft sdf-protocol-mapping August 2026 example: gatt enum: - gatt serviceID: type: string example: 00001809-0000-1000-8000-00805f9b34fb characteristicID: type: string example: 00002a1c-0000-1000-8000-00805f9b34fb - type: object required: - type properties: type: type: string example: advertisements enum: - advertisements - type: object required: - type properties: type: type: string example: connection_events enum: - connection_events Figure 20: OpenAPI model for BLE B.2. Protocol map for Zigbee file "ProtocolMap-Zigbee.yaml" =============== NOTE: '\' line wrapping per RFC 8792 ================ openapi: 3.0.3 info: title: SDF Protocol Mapping for Zigbee description: |- SDF Protocol Mapping for Zigbee devices. version: 0.10.0 externalDocs: description: SDF Protocol Mapping IETF draft url: https://datatracker.ietf.org/doc/draft-ietf-asdf-sdf-protocol\ -mapping/ paths: {} Mohan, et al. Expires 12 February 2027 [Page 28] Internet-Draft sdf-protocol-mapping August 2026 components: schemas: ## Protocol mapping for Zigbee property ProtocolMap-Zigbee-Propmap: required: - zigbee type: object properties: zigbee: oneOf: - $ref: '#/components/schemas/Zigbee-Property' - type: object required: - read - write properties: read: $ref: '#/components/schemas/Zigbee-Property' write: $ref: '#/components/schemas/Zigbee-Property' ## Reusable Zigbee property object Zigbee-Property: required: - endpointID - clusterID - attributeID - attributeType type: object properties: endpointID: type: integer format: int32 example: 1 clusterID: type: integer format: int32 example: 6 attributeID: type: integer format: int32 example: 16 attributeType: type: integer format: int32 example: 32 profileID: type: integer Mohan, et al. Expires 12 February 2027 [Page 29] Internet-Draft sdf-protocol-mapping August 2026 format: int32 example: 260 manufacturerCode: type: integer format: int32 example: 4174 ProtocolMap-Zigbee-Event: required: - zigbee type: object properties: zigbee: oneOf: - type: object required: - type - endpointID - clusterID - attributeID - attributeType properties: type: type: string example: attribute_reporting enum: - attribute_reporting endpointID: type: integer format: int32 example: 1 clusterID: type: integer format: int32 example: 6 attributeID: type: integer format: int32 example: 16 attributeType: type: integer format: int32 example: 41 profileID: type: integer format: int32 example: 260 manufacturerCode: Mohan, et al. Expires 12 February 2027 [Page 30] Internet-Draft sdf-protocol-mapping August 2026 type: integer format: int32 minReportingInterval: type: integer format: int32 example: 10 maxReportingInterval: type: integer format: int32 example: 300 reportableChange: type: number example: 50 - type: object required: - type - endpointID - clusterID - attributeID - attributeType properties: type: type: string example: write_event enum: - write_event endpointID: type: integer format: int32 example: 1 clusterID: type: integer format: int32 example: 6 attributeID: type: integer format: int32 example: 16 attributeType: type: integer format: int32 example: 41 profileID: type: integer format: int32 example: 260 manufacturerCode: type: integer Mohan, et al. Expires 12 February 2027 [Page 31] Internet-Draft sdf-protocol-mapping August 2026 format: int32 - type: object required: - type properties: type: type: string example: connection_events enum: - connection_events ## Protocol mapping for Zigbee action ProtocolMap-Zigbee-Action: required: - zigbee type: object properties: zigbee: required: - endpointID - clusterID - commandID type: object properties: endpointID: type: integer format: int32 example: 1 clusterID: type: integer format: int32 example: 6 commandID: type: integer format: int32 example: 0 profileID: type: integer format: int32 example: 260 manufacturerCode: type: integer format: int32 example: 4174 Figure 21: OpenAPI model for Zigbee Mohan, et al. Expires 12 February 2027 [Page 32] Internet-Draft sdf-protocol-mapping August 2026 Acknowledgements This document relies on SDF models described in [RFC9880], as such, we are grateful to the authors of this document for putting their time and effort into defining SDF in depth, allowing us to make use of it. The authors are grateful to Carsten Bormann, Jan Romann, Ari Keränen, and Eliot Lear for their reviews and contributions to this document, in particular Jan Romann for his help with the CDDL definitions (Figure 18) and Eliot Lear for his contributions to Section 6. Authors' Addresses Rohit Mohan Cisco Systems 170 West Tasman Drive San Jose, 95134 United States of America Email: rohitmo@cisco.com Bart Brinckman Cisco Systems 170 West Tasman Drive San Jose, 95134 United States of America Email: bbrinckm@cisco.com Lorenzo Corneo Ericsson Hirsalantie 11 FI-1296 Jorvas Finland Email: lorenzo.corneo@ericsson.com Mohan, et al. Expires 12 February 2027 [Page 33]