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Layers and Alternative Application Layers

This article discusses the general concepts of layers in the 11073 object approach, including the object layer, association layer, and alternative association layers like Zigbee Cluster Library and BT LE.

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Layers and Alternative Application Layers

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  1. LayersandAlternative Application Layers Malcolm Clarke September 10, 2012

  2. General Concepts of Layers

  3. Object Approach Agent Object Manager Proxy Object Events Actions Get Set • The object approach of 11073 is a general mechanism to update values of all attributes from the object in the Agent to its proxy object in the Manager • This can be done asynchronously (Events) or by polling (Get) • Can also act on the object to update attributes (Set) or interact (Actions)

  4. Layers - ACSE Associate, Release, Abort APDU • This is achieved using physical connection and exchanging APDU between peer entities in the ACSE (Association Control Service Element) • ACSE is responsible for association and messages are exchanged for Associate, Release and Abort

  5. Layers - ROSE Get, Set, Event, Action Methods PDU Associate, Release, Abort APDU • Once associated, PDU are exchanged between peer entities in ROSE (Remote Operation Service Element) • ROSE is responsible for providing METHODS to access and manage Objects and messages are exchanged for Get, Set, Event and Action

  6. Layers – Object Layer Attribute values { Parameters PDU Get, Set, Event, Action Association Layer Methods PDU Associate, Release, Abort APDU • ROSE operates on peer objects in the Object Layer • ACSE and ROSE constitute the Association Layer

  7. 11073 Object Layer Methods (Get, Set, Event, Action) Parameters (Attribute:Value) • Objects in 11073 are accessed indirectly • Each object is referenced by its Handle and the type of the object is taken from the type attribute • Each attribute is accessed by using its nomenclature code (32 bits – 16+16) • The type of the attribute is defined by ASN.1 and structured types fully defined down to basic types • This has the advantage of allowing multiple instances of the same object type

  8. Alternative Association Layers

  9. Alternative Association Layers • Several “transport” technologies now define and support an object oriented approach and provide primitives to access and manage objects (methods) • Zigbee defines the Zigbee Cluster Library (ZCL) • BT LE defines ATT and GATT • Could these alternative Association Layers support 11073 objects and methods?

  10. Zigbee Cluster Library • Supports • Discover Attributes • Read Attributes • Write Attributes • Report Attributes • Configure reporting • Min/Max time between reports • Min change between reports • Read Reporting Configuration

  11. Zigbee Cluster Library • Defines • Attribute Clusters (eg General, Power configuration) • The collection of clusters defined as a profile • Attribute Sets in the cluster (eg Basic device information, basic device settings) • Attributes in the set • Currently 12 bits used to identify the Attribute Set and 4 bits the attribute within the set • Up 1000 addressable Attribute Sets (objects) each with up to 16 addressable attributes

  12. Zigbee Attribute Reporting

  13. ZCL Object Layer – exampleGeneral Attribute Set Attributes of Basic Device Information Attribute Set

  14. Zigbee Cluster Library • Can we map 11073 devices to ZCL?

  15. ZCL Object Layer – take an exampleWeighing Scale Attribute Set Attributes of Basic Mass Attribute Set

  16. Metric Object Attributes

  17. Numeric Object Attributes

  18. Enumeration Object Attributes

  19. RT-SA Object Attributes

  20. MDS Object Attributes

  21. MDS Object Attributes

  22. Limitations • Not instance based addressing

  23. BT LE Attributes • BT LE also defines 16 bit attribute identifiers • Provides Object Access Methods • Object.Attribute could be defined for each device and correspond to specialization (ConfigId) as per ZCL • Object.Attribute Sets in the cluster (MDS, Metric Objects) • Attributes in the object set defined per MDS or Metric Object

  24. Questions or Comments?

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