Broering - Bridging Sensor Networks and Sensor Webs @ WOT2010

Interaction Patterns for Bridging the Gap betweenSensor Networks and the Sensor Web
Arne Broering, Theodor Foerster, Simon Jirka
Web of Things Workshop, March 29th, 2010

Motivation
Disaster management requires real-time sensor data!
On-the-fly integration of (geo)sensors!
Arne Broering - broering@52north.org

SWE - Functionalities
Discovery
Sensor Instance Registry
Sensor Observable Registry
Access
Sensor Observation Service
Tasking
Sensor Planning Service
Eventing / Alerting
Sensor Alert Service
Sensor Event Service
SIR
SOR
SOS
SPS
SAS
SES

Sensor Web Enablement (SWE)
http://www.ogcnetwork.net/swe
Web Service interfaces & data encodings
Used to build a Sensor Web
Integration of (geo)sensors on application level

Problem: Conceptual Gap
Application Layer
Sensor Web Layer
Sensor Network Layer

Close gap: Sensor Network – Sensor Web
Ease sensor / service integration
Facilitate usage of SWE
On-the-fly integration (plug & play) of sensors
Objectives

Sensor Bus
Application Layer
Sensor Web Layer
Sensor Network Layer

Bus Message Protocol
RegServ*<service URL>*<sensor A id>
RegServ*<service URL>*<sensor B id>
...
Service Registration
Sensor Registration
Data Publication
Sensor Tasking
Status Update
IntroSen*<sensor id>*<description URL>
PubData*<sensor id>*<time>*<property>*<data>
PubTask*<sensor id>*<task id>
TaskParam*<task id>*<param 1>*<value 1>
...
DoTask*<task id>
SenStatus*<sensor id>*<property>*<value>

Sensor Bus - Twitter
SPS
SOS
SWE
SWE
DB
Config
Account
Sensors
Config
Account
Sensors
Service
Adapter
Service
Adapter
1. PubTask
2. TaskParam 10 min
...
x. DoTask
1. IntroSen
2. PubData 30°
3. PubData 45°
...
Sensor
Adapter
SensorML
Position
Feature
Property
...
Config
Account
Services

Sensor Bus - Twitter
Pros:
Managed scalability
Managed reliability
Managed security
Cons:
Limited Tweet length (140 characters)
Limited update rate of search index
Max 150 requests per hour (20.000 if whitelisted)
Max 1.000 Tweets a day

SAS
SIR
SOS
SWE
SWE
SWE
Service
Adapter
Service
Adapter
Service
Adapter
Sensor Bus - XMPP
Chatroom
Sensor
Adapter

Outlook
Evaluate different implementations
Twitter, XMPP, IRC, JMS, ...
Develop mechanisms for sensor plug & play
Apply to real world use cases
www.etamax.de
www.G-WaLe.de
Sensor
Adapter
Sensor Interface Description
(SensorML)

Questions?
Thank you!
Arne Broering
broering@52north.org
Sensor Web community: http://52north.org/swe
Sensor Bus project: http://52north.org/sensorBus
Sensor Web lab: http://swsl.uni-muenster.de

RESTful SOS
Observation retrieval:
GET http://sos / offering / sensor / feature / property / begin / end / format
Demo link:
http://v-swe.uni-muenster.de:8080/52n-OXF-WS/RESTful/sos/

RESTful SPS
Task submission:
POST http://ws.spotimage.com/sps/offerings/spot5/tasks
Carrying an XML description of task
Task status:
GET http://ws.spotimage.com/sps/offerings/spot5/tasks/002342/status.xml
Task control:
PUT http://ws.spotimage.com/sps/offerings/spot5/tasks/002342/command
e.g.: <command>cancel</command>

Sensor Bus overview

Sensor Bus - Overview

Problem: On-the-fly Integration
Rieselfelder

Sensor Interface Description (SID)
Sensor Bus
Bus Protocol
Bus Protocol
Bus Protocol
Data Acquision PC
Data Acquision PC
Data Acquision PC
SID Interpreter
SID Interpreter
SID Interpreter
SensorML
SensorML
SensorML
USB
TCP/IP
FTP / JDBC
Sensor Network
Gateway
Sensor Files / DB
Sensor
Zigbee
S1
S3
S2
Sensor
S5
S4

Sensor Integration Tools

Message Bus Pattern
(1) common communication infrastructure
(2) shared set of adapter interfaces
(3) well-defined message protocol
Hohpe & Woolf. Enterprise integration patterns: Designing, building, and deploying messaging solutions. Addison-Wesley Longman Publishing, Boston, MA, USA, 2003.

Service Registration

Sensor Registration

Discovery

Data Publication

Sensor Tasking

GetCapabilities
SES
DescribeSensor
GetCurrentMessage
(WS-BaseNotification)
RegisterPublisher
(WS-BrokeredNotification)
RegSen
Subscribe
RegServ
Service
Adapter
Publisher endpoint
Topic
SensorML
Filter
Subscriber endpoint
Sensor
Adapter
Unsubscribe
Notify
Renew
Producer reference
Topic
Message
PubData
Notify
NotificationConsumer
Client
(e.g. SOS)
PauseSubscription
ResumeSubscription
RenewRegistration
DestroyRegistration
CreatePullPoint
GetMessages
DestroyPullPoint

http://www.webofthings.com	154
http://www.webofthings.org	86
http://swsl.uni-muenster.de	30
http://www.slideshare.net	15
http://sensorweb.uni-muenster.de	5
http://swsl	2
http://www.techgig.com	2
http://sensorweb	1
http://webcache.googleusercontent.com	1

Broering - Bridging Sensor Networks and Sensor Webs @ WOT2010

by Arne Broering on Apr 09, 2010

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Broering - Bridging Sensor Networks and Sensor Webs @ WOT2010 — Presentation Transcript