Presentation of "A Triple Space-Based Semantic Distributed Middleware for Internet of Things" in TouchTheWeb workshop(ICWE2010). In the Internet of Things several objects with network capabilities are connected over a self-configured local network with other objects to interact and share knowledge. In this context, the Triple Space approach, where different processes share common semantic knowledge, seems to fit perfectly. We presented our progress towards a semantic middleware which allows the communication between a wide range of embedded devices in a distributed, decoupled and very expressive manner. This solution has been tested in a stereotypical deployment scenario showing the promising potential of this approach for local environments.

1. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
A Triple Space-Based Semantic Distributed
Middleware for IoT
Aitor G´mez-Goiri1
o Diego L´pez-de-Ipi˜a2
o n
DeustoTech, Deusto Institute of Technology
http://www.morelab.deusto.es
July 6, 2010
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

2. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Presentation
1 Motivation
2 Basic API
3 Proposed middleware
queryMultiple
Services
Embedded platform
Mobile platform
4 Demo
5 Experimentation
6 Conclusions
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

3. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Motivation
Self-configuring wireless network of devices whose purpose
would be to interconnect all things
Smart environments usually consist of a central device which
has reason capacity and coordinates other devices
Requires human intervention every time a new device is
deployed
Our aim is try to simplify the collaboration between devices
providing certain intelligence on them
without centralized coordinator
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

4. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Some alternatives...
UPnP. Autoconfigure networks, devices share capabilities,
events...
DLNA. To share media content.
Drawbacks:
Multiple APIs and protocols from different vendors
Semantic: Share knowledge instead of data.
Without predefined language.
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

5. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Triple Space
Tuplespace: read and write data structures in a shared space
TripleSpace: read and write triples of semantic data
Reference autonomy
Time autonomy
Space autonomy
tsc++
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

6. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Distributed approach
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

7. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
How is it distributed?
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

8. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Write
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

9. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Query
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

10. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Read
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

11. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Take
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

12. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Subscribe and advertise
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

13. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Proposed middleware
tsc++ has been modified to provide another 3 primitives
queryMultiple
register
invoke
tscME developed
communication between tsc++ peers and tscME peers
gateway for other embedded devices
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

14. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Boundaries
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

15. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Query vs. QueryMultiple
template: ?s ?p ?o .
n templates which are extracted from a SPARQL query
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

16. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Input query
CONSTRUCT {
?measure ismed:hasValue ?value .
}
WHERE {
?measure rdf:type ismed:LightMeasure .
?measure ismed:hasValue ?value .
?measure ismed:hasDateTime ?datetime .
OPTIONAL {
?measure2 rdf:type ismed:LightMeasure .
?measure2 ismed:hasDateTime ?datetime2 .
FILTER(?datetime2 > ?datetime) .
}
FILTER( !bound(?datetime2) )
}
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

17. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Templates after processing the query
?s rdf:type ismed:LightMeasure .
?s ismed:hasValue ?o .
?s ismed:hasDateTime ?o .
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

18. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Why is a new service approach necessary?
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

19. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Security
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

20. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Concurrency
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

21. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Location of the information
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

22. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Register
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

23. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Invocation (from the service consumer point of view)
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

24. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Invocation (from the service provider point of view)
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

25. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Embedded platform: SunSPOT
Squawk Virtual Machine
Basestation
RESTful API for tsc++: Jetty + Jersey
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

26. Motivation
Basic API queryMultiple
Proposed middleware Services
Demo Embedded platform
Experimentation Mobile platform
Conclusions
Mobile platform: tscME
Communication: Jxme
Data store: RecordStore/Memory
Semantic mngmnt: Microjena
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

27. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Scenario
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

28. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Experimentation
Kernels 1 10 20
Spaces 1 5 10 1 5 10 1 5 10
read 0.2 0.2 0.3 3.5 3.0 3.0 10 10 9.8
take 0.2 0.2 0.3 3.4 2.9 2.6 10.3 9.9 11.1
query 0.4 0.3 0.2 7.0 3.7 3.3 24.8 11.9 10.6
Table: TscME networking evaluation results (in seconds)
↑ responses: ↑ processing time
perform specific queries
↑ graphs: ↑ processing time
distribute graphs over different spaces
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT

29. Motivation
Basic API
Proposed middleware
Demo
Experimentation
Conclusions
Conclusions
TS appropriate to share knowledge between heterogeneous
devices
tsc++ is not appropriate for mobile devices: tscME
Primitives are powerful but awkward
Performance dependent on the implementation
Not only between them, also exporting data to Internet
Aitor G´mez-Goiri, Diego L´pez-de-Ipi˜a
o o n A Triple Space-Based Semantic Distributed Middleware for IoT