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WoT 2013 Interop

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WoT 2013 Interop

  1. 1. Toward Interoperability In a Web of Things Michael Blackstock, Rodger Lea Media and Graphics Interdisciplinary Centre University of British Columbia, Canada Thursday, 12 September, 13
  2. 2. Motivation The Web of Things promises to connect islands of things BUT Developers are making independent decisions about “thing” representations and protocols. Often leave application and tool developers to ‘fill the gaps’ Full interoperability for all “things” is a massive undertaking How can we increase interoperability while maintaining high degree of innovation? Are there ‘levels’ and a path toward increasing interoperability over time? Explore an approach to standardization in WoT Community Thursday, 12 September, 13
  3. 3. Web-enabled IoT Products Platforms Hubs Sensor Webs Mashup Platforms and Tools WoT Today Thursday, 12 September, 13
  4. 4. Many Standards Activities Not all take a “hub centric” approach Some are application or domain specific Thursday, 12 September, 13
  5. 5. WoT Interop Challenges What are Things? - buildings, sensors, tags, actuators, organizations, services, people? Thing Interaction - communicate between things and applications, real time; web protocols and representations Finding Things - search and discovery Thing Identification - names, IDs, URLs Describing Things - location, environment, capabilities Securing Things - access control, licensing, confidentiality Thing History - how, where do we store past state Thursday, 12 September, 13
  6. 6. Toward Interoperability Significant cooperation and widespread agreement on many issues is needed Need to understand the benefits and costs of greater interop including added complexity and possibly limits on innovation Suggest a hub-centric model each hub addresses these issues focus on needs of application and mashup developers reduces integration task, many things on fewer hubs. Staged approach - agree on some foundational technologies then build as community evolves Thursday, 12 September, 13
  7. 7. ProfilesHubModel Levels of Interoperability WoT Core Clarify best practices for web-enabling the IoT. Minimal interoperability using the web leaving app and tool developers to do more of the work. Define common models e.g. catalogs, things, groups of things Toward simpler adapters and limited interop Implementation of model and decisions on resources and representations, access control and security. Direct code reuse between hubs. Agree on ontologies and semantics allowing deeper integration. Little or no adaptation required. Iterate: refine models, implementation and profiles Thursday, 12 September, 13
  8. 8. UK TSB Project Technology Strategy Board: UK govt funded org designed to help companies innovate IoT Ecosystem Demonstrator: 8m GBP ($12m) for 8 projects for 1 year with a further 4m follow on Key objective is to achieve (a degree of) interoperability across variety of domains “stimulate the development of an open application and services ecosystem in the Internet of Things” Thursday, 12 September, 13
  9. 9. Project Overviews Transportation Built Environment Home Critical Infrastructure Education IoT-Bay DISTANCE Thursday, 12 September, 13
  10. 10. demonstrate how the IoT can drive innovation in the UK's Highways sector -- road networks Focus applications Gully Cleaning/flooding Winter Maintenance/Gritting Roadways/ Maintenance Things - sensors & mobile apps Roadway conditions Lighting and signals Drains, flooding patterns Smart Streets Thursday, 12 September, 13
  11. 11. Unified landing page CKAN open data portal static data resources Web of Things Toolkit sensor data Interop API catalog Thursday, 12 September, 13
  12. 12. Interop Approach Web technologies at the core, often using existing WoT platforms Each consortium implements one or more ‘hubs’ Hubs communicate with things to expose them to applications WoT Hub ApplicationsApplicationsApplications WoT Hub WoT Hub Other Hubs Things and data Thursday, 12 September, 13
  13. 13. TSB Project Interop API Provide access to “things” - data and information about what that data represents. Implement interface 1 between applications and hub. Use data from at least one other hub. Minimal requirements for exchanging catalogs of things Needed for agreement on a lightweight approach WoT Hub ApplicationsApplicationsApplications WoT Hub WoT Hub Other Hubs Things and data 2 3 1 Thursday, 12 September, 13
  14. 14. Specification Model catalogues - /cat returns a root catalogue object sub-catalogs & items - URIs + metadata objects CRUD catalogue operations Simple search - metadata keys and values Simple security - keys supplied in header; key distribution out of scope Open for extensibility - very little required meta data few defined resource formats, metadata, access to data, interaction Thursday, 12 September, 13
  15. 15. { "item-metadata" : [ { "rel" : "urn:X-tsbiot:rels:isContentType", "val" : "application/vnd.tsbiot.catalogue+json" }, { "rel" : "urn:X-tsbiot:rels:hasDescription:en", "val" : "Smart Streets data catalogue that contains static resources." }, { "rel" : "urn:X-tsbiot:rels:supportsSearch", "val" : "urn:X-tsbiot:search:simple" } ], "items" : [ { "href" : "/cat/data/average-temperature-and-rainfall-england-and-wales", "i-object-metadata" : [ { "rel" : "urn:X-smartstreets:rels:lastUpdate", "val" : "2013-06-19T00:00:20.761429" }, { "rel" : "urn:X-smartstreets:rels:hasId", "val" : "3f952707-b04e-4a32-a807-a53b6fa0ee58" }, { "rel" : "urn:X-smartstreets:rels:hasLicense", "val" : "UK Open Government Licence (OGL)" }, { "rel" : "urn:X-smartstreets:rels:hasName:en", "val" : "average-temperature-and-rainfall-england-and-wales" }, { "rel" : "urn:X-tsbiot:rels:hasDescription:en", "val" : "Average temperature and total rainfall in England and Wales : 1845 to 2010" }, { "rel" : "urn:X-smartstreets:rels:tags", "val" : "average-rainfall,average-temprature,england,new-tag-1,new-tag-2,wales" }, { "rel" : "urn:X-smartstreets:rels:hasVisibility", "val" : "public" }, { "rel" : "urn:X-tsbiot:rels:isContentType", "val" : "application/vnd.tsbiot.catalogue+json" }, { "rel" : "urn:X-tsbiot:rels:supportsSearch", "val" : "urn:X-tsbiot:search:simple" }, { "rel" : "urn:X-tsbiot:rels:containsContentType", "val" : "application/vnd.ms-excel" } ] }, { ... additional items ... } ] } Describe Catalogue Supports Simple Search Dataset Item URL Meta data rel/val Example Catalog Mandatory meta data - description and content type Thursday, 12 September, 13
  16. 16. Challenges Specification too narrow easy agreement but limited interoperability and application usefulness need to define relationships, data types, interaction Simple Search is not so simple doesn’t make sense to search by value in many cases (e.g. latitude) underlying system often doesn’t permit search by certain relationships and values Data vs. Metadata search by data values (not just metadata) should be possible no specification on the data formats for things yet Catalog updates, security replicate catalog or proxy? Force hubs to implement API? exposed catalog depends on who is accessing it. Missing features that become obvious with use - e.g. paging Thursday, 12 September, 13
  17. 17. Conclusion and Next Steps Toward interoperability start simple - e.g. catalogs of things Iteratively define and implement interoperable hub model and APIs Start to define common profiles WoT Community take a leadership role Work toward a common position - paper? Outline WoT Models, Patterns, Best Practices Stronger links to TSB project Collaborate within a standards group - W3C? Thursday, 12 September, 13
  18. 18. Demo Thursday, 12 September, 13

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