The document discusses the SenseBox project and recommendations for OGC standards for the Internet of Things. It describes the SenseBox, which uses small sensor devices connected to the web to monitor things like traffic. It provides examples of how sensor data could be accessed via REST APIs and summarized for human or machine consumption. It recommends OGC focus HTTP-based protocols, standardize REST APIs for the Web of Things, and use lightweight encodings like JSON to address constraints of resource-limited IoT devices.

1. The SenseBox project
and
IoT Recommendations for OGC SWE
Arne Bröring -- 52° North / University of Münster
OGC Standards for the Internet of Things Workshop
Brussels, November 30th 2011

2. Introduction
 Advancements in microelectronics 
– Components (processors, communication units etc.) are getting
smaller, cheaper, more power efficient…
 Integration of microelectonics into day-to-day things
 Extends the physical thing to a digital object
 Extends the Internet / Web to physical things
Arne Bröring - OGC TC Brussels – 30.11.2011

3. Terminology….
http://www.webofthings.com/
Arne Bröring - OGC TC Brussels – 30.11.2011

4. Review
Internet Web (= WWW)
 System of interconnected  System of interlinked
computer networks hypertext documents
 Has several applications  An application of the
 (e.g., WWW, email, VoIP) Internet
 Based on:  Based on:
 IPv4 / IPv6 (IETF)  URL (IETF)
 TCP (IETF)  HTTP (IETF)
 HTML (W3C)
Arne Bröring - OGC TC Brussels – 30.11.2011

5. Research Fields: IoT / WoT
IoT WoT
 Low-level protocols for  Utilizes HTTP
smart things
(e.g. 6LoWPAN, MQTT)  REST APIs for things
 Naming services for things
 Mash-up applications
(e.g. EPCGlobal)
 Identification (e.g. RFID)  …
 …
Arne Bröring - OGC TC Brussels – 30.11.2011

6. Web of Things
HTTP
Thing Web
HTTP
Arne Bröring - OGC TC Brussels – 30.11.2011

7. WoT Application: SenseBox
act
communicate
reason
Thing Web
sense
Aim: Generic sensor platform on the Web
Arne Bröring - OGC TC Brussels – 30.11.2011

8. Use Case: Traffic SenseBox
Service vehicle
Request
Road maintenance
(http://strassen.nrw.de)
Arne Bröring - OGC TC Brussels – 30.11.2011

9. SenseBox Prototype
Arne Bröring - OGC TC Brussels – 30.11.2011

10. Hardware Design
Mini ITX
1.6 GHz
2 GB
Arne Bröring - OGC TC Brussels – 30.11.2011

11. Hardware Design
Component Price in €
Ultrasonic Sensor SRF8 40
GPS Shield 55
Arduino Uno Board 25
Intel Board 55
2GB Memory 20
Flash Card + Reader 40
UMTS Dongle 30
Power Supply 30
Other ~80
TOTAL 375
Arne Bröring - OGC TC Brussels – 30.11.2011

12. Traffic SenseBox
Arne Bröring - OGC TC Brussels – 30.11.2011

13. Data Processing
Distance
x x x
x
x x Process
1
Time
• Cars/minute Machine readable
• Utilization in %
• … Process
2
• „Traffic jam!“ Human readable
• „Free road.“
• …
Arne Bröring - OGC TC Brussels – 30.11.2011

14. Accessing SenseBoxes
GET Observations
Sense Box
Web Portal
HTTP GET
Arne Bröring - OGC TC Brussels – 30.11.2011

15. REST API for SenseBox Observations
http://my.portal/boxes/<id>
http://my.portal/boxes/7/observations/<id>
http://my.portal/boxes/7/observations?property=car_count
http://my.portal/boxes/7/observations?property=car_count
&time=2011-01-10T14:00,2011-02-11T16:00
http://my.portal/boxes/7/observations
?bbox=3,6,23,36,urn:ogc:def:crs:EPSG:6.5:4326
Arne Bröring - OGC TC Brussels – 30.11.2011

16. Example Observation
"OM_Measurement": {
"identifier":"obs_1",
"phenomenonTime":"2011-11-30T16:40+02:00",
"observedProperty":"car_count",
"procedure":"http://example.org//sensor_1.xml",
"featureOfInterest": {
"type":"http://www.opengis.net/.../SF_SamplingPoint",
"shape": {x:7.0,y:52.0,spatialReference:{wkid:4326}}
},
"result": {
"uom":"cars/minute",
"value":10
}
}
Arne Bröring - OGC TC Brussels – 30.11.2011

17. Announcement Broadcast
MAIL
SMS
Arne Bröring - OGC TC Brussels – 30.11.2011

18. SenseBox Light
 Arduino UNO
+ Ethernet Shield
+ GPS Shield
 ~ 100 €
 Problem:
– Main memory: 2 kB
– Program memory: 32 kB
 Need for lightweight protocols!
Arne Bröring - OGC TC Brussels – 30.11.2011

19. Conclusions
 We have seen difference between
Internet (of Things) and Web (of Things)
 We have looked at an example WoT application:
 the SenseBox project
 As a WoT application, the SenseBox needs REST API
 Limited resources!
Arne Bröring - OGC TC Brussels – 30.11.2011

20. Recommendations for IoT standardization activities
 Concentrate on HTTP-based protocols !?
– In opposition to TCP/IP based approaches
 Standardize REST API for the WoT !?
 Lightweight encodings (JSON) for O&M / SensorML !
– New “ThingML“ ??
 Call it Web of Things at OGC ?!
Arne Bröring - OGC TC Brussels – 30.11.2011

21. Acknowledgements
Many Thanks go to the rest of the SenseBox team:
Dustin Demuth Dr. Albert Remke
Kristina Knoppe Damian Lasnia
Maurin Radtke
Arthur Rohrbach
Raimund Schnürer
Christopher Stephan
Umut Tas
Jan Wirwahn
Arne Bröring - OGC TC Brussels – 30.11.2011

22. Questions?
Thank you!
Arne Bröring
broering@52north.org
52°North: http://52north.org
Sensor Web lab @ IfGI: http://swsl.uni-muenster.de
Arne Bröring - OGC TC Brussels – 30.11.2011