2nd Solid Symposium: Solid Pods vs Personal Knowledge Graphs
Ipso eclipse-summary
1. 1
IPSO Smart Objects
October16, 2014
And Related Standards
2. IPSO Smart Objects - Device to Application Interoperability
2
Application Software
IPSO Objects
OMA LWM2M
CoAP HTTP
6LowPAN IPV4/IPV6
802.15.4 WiFi, Ethernet
MCU – 16KiB RAM MPU
Application
Data Models
API and Services
Application Protocol
Routing
HW Network
Hardware
3. IPSO Smart Objects - Use Case Applicability
3
Web
Application
Application
Service e.g. LWM2M
Server
Sensor/
Actuator
Device
Device with
Embedded
Application
Application
Client
Peer-Peer
Constrained
Device, e.g. 16KB
RAM, 128KB Flash
Smart Object Registration,
Discovery and Data Layer
Service, Device Proxy and Cache
Applications can Discover and
Interact with devices using Peer-Peer
networking or through Services, using
the same semantics
4. IPSO Smart Objects
4
§ IPSO Smart Objects are based on OMA LWM2M
§ Defines application objects using the LWM2M Object Model
§ Complex objects can be composed from simple objects
§ Easy to add new resource and object types as needed
§ OMA LWM2M is based on CoAP
§ Provides a server profile for IoT middleware
§ Defines a simple reusable object model
§ Defines management objects and reuses REST API for onboarding and device life cycle management
§ CoAP and related standards from IETF
§ CoAP Protocol (RFC 7252) provides a REST API for device abstraction and data compatibility layer for
constrained networks and devices
§ HTTP Proxy provides application abstraction through standard web APIs
§ Core-link-format (RFC 6690) provides a way to add semantic descriptors in the form of web links and
enables local resource discovery through the REST API
§ Resource Directory provides an API for scalable discovery and linking using core-link-format primitives
5. Review - CoAP Protocol
5
§ Makes each device a lightweight server
that exposes a REST API
§ A CoAP device can be both client and
server
§ Roles can be reversed and the sensor, as
a client, can update a REST API at
another node, device or server
§ Peer to Peer interaction based on a
duplex client-server pattern
6. Review - Resource Discovery
6
See draft-ietf-core-resource-
directory
Web Applications Discover
Registered Resources
• CoRE Link Format defines
– The link format
– Peer-to-peer discovery
• A directory approach is also useful
– Supports sleeping nodes
– No multicast traffic, longer battery life
– Remote lookup, hierarchical and federated distribution
• CoRE Link Format is used in Resource
Directories
– Nodes POST (register) their resource links to an RD
– Nodes PUT (refresh) to the RD periodically
– Nodes may DELETE (remove) their RD entry
7. Resource Discovery Example Flow
7
See draft-ietf-core-resource-directory
core.rd
service
REGISTRATION!
POST /rd?ep=‘235598376’<=19999!
</3303/0/5700>;rt=“urn:X-ipso:temp-C”!
Endpoint
2.01 Created Location:/rd/235598376
DISCOVERY!
GET /rd-lookup?ep&rt=“urn:X-ipso:temp-C”!
2.05 Content !
</235598376/3303/0/5700>;rt=“urn:X-ipso:temp-C”!
Endpoint
8. Review - LWM2M Reference Architecture
8
§ Web Applications
§ Application abstraction through
REST API
§ Resource Discovery and Linking
§ LWM2M Server
§ CoAP
§ Supports HTTP Caching Proxy
§ Resource Directory
§ Gateway and Cloud deployable
§ LWM2M Clients are Devices
§ Device abstraction through CoAP
§ LWM2M Clients can be CoAP Servers
§ Any IP network connection
9. LWM2M Application Server
9
Web App
LWM2M
Server
CoAP
Soft Endpoints
IP
Device
/domain/endpoints/3303/0/5700
/3303/0/5700
IP
Device
LWM2M Clients
10. LWM2M Application Server
10
Web App
http/REST
LWM2M
Server
CoAP
IP
Device
/domain/endpoints/3303/0/5700
/3303/0/5700
IP
Device
LWM2M Clients
11. LWM2M Application Server
11
Web App
http/REST
LWM2M
Server
CoAP
IP
Device
1. NOTIFY
IP
Device
LWM2M Clients
12. IPSO Smart Object Structure
12
• A Client has one or more Object Instances
• An Object is a collection of Resources
• A Resource is an atomic piece of information that
can be
– Read, Written or Executed
• Objects can have multiple instances
• Objects and Resources are identified by a 16-bit
Integer, Instances by an 8-bit Integer
• Objects/Resources are accessed with simple URIs:
/{Object ID}/{Object Instance}/{Resource ID}
Ex: /3/0/1 (Object Type=Device, Instance=0,
Resource=Device Mfg.)
13. IPSO Smart Object Structure
§ REST API with a URI template
13
§ Objects
§ Object Instances
§ Resources
§ (Resource Instances)
§ Reusable resource and object IDs
§ Common definitions for concepts
§ Map to semantic terms e.g.
temperature, currentValue
§ IDs are registered with the OMNA
§ Can be embedded in a path
hierarchy on the server
§ /home/weather/3303/0/5700
3303/0/5700!
Object ID, defines object type
Object Instance, one or more
Resource ID, defines resource type
18. IPSO Smart Object Summary
18
Application Software
IPSO Smart Objects
OMA LWM2M
CoAP
Not tied to specific device or protocol
Any Programming Language
Runs on devices, gateways, and services
Application Level Interoperability
Reusable Device to Application API
Not tied to any specific protocol
Service Layer Specification
Device Management over CoAP
Object Model for DM and Applications
REST protocol for constrained devices
IETF Standard (RFC 7252)
Uses TCP or UDP, any IP connection
Discovery using IP Multicast or Directory
19. IPSO Smart Object Summary
19
• Simple web objects that represent common sensors, actuators,
and data elements exposed for Internet of Things applications
• Based on Internet and Industry Standards
• Objects can be composed into more complex objects; for example
a temperature object, set point object, and load control object can
be combined to create a thermostat object
• Recently published the first set of objects to cover some common
Smart Home and Sensor use cases
• New objects are easy to create; we are planning a developer-friendly
process for creating and registering new objects
20. IPSO Smart Object Summary
20
§ Smart Objects are Easy to Modify and Customize
§ Based on Consistent Design Patterns and Reusable Resource
Definitions
§ Object Sets can be Forked and Modified
§ Expecting Domain-Specific Object Sets to be Created by
Collaborative Vertical Working Groups
§ New Object Sets can be Released as new Smart Object Guidelines
§ Objects in Released Smart Object Guidelines are Registered with the
OMA, Use Standard OMA DDF (XML) File Format Object Descriptors
21. IPSO Smart Objects Future Work
21
§ Linked Composite Objects
§ Gateway Management Objects – Mapping of TR-069 to REST
§ Behavioral Objects – Smart Objects to represent embedded Timers,
Sequencers, Controllers and bindings to resources
§ Mapping and Binding of Smart Objects to Zigbee Application Clusters
(OnOff Cluster Example)
§ Mapping and Binding of Smart Objects to Bluetooth Application Profiles
(Heart Monitor Example)
§ Advanced Lighting Objects
22. References
IPSO Smart Object Guideline
22
http://www.ipso-alliance.org/technical-information/ipso-guidelines
OMA LWM2M Specification
http://openmobilealliance.hs-sites.com/lightweight-m2m-specification-from-oma
IETF CoAP and Related Specifications
CoAP (RFC 7252):
http://tools.ietf.org/html/rfc7252
CoRE Link-Format (RFC 6690):
http://tools.ietf.org/html/rfc6690
CoRE Resource Directory:
http://tools.ietf.org/html/draft-ietf-core-resource-directory-01
CoAP Community Site
http://coap.technology/
