1. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY TATIONpRESEN The homeport system Jeppe Brønsted, Post Doc, Phd Aarhus University, Computer Science Department Denmark

2. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 2 motivation: sustainable energy consumption in the home › Optimize energy consumption through integration of home automation technologies › Optimization principles › Use less - by e.g. letting a single switch turn all lights off › Use at the optimal time of day - by e.g. using the washing machine at night › Store energy - by e.g. using floor heating at night › Optimization points › Suboptimal energy consumption - e.g. by having lights on in empty rooms › Mitigated by automization - e.g. by connecting the alarm system with the light control › Wasteful consumption - e.g. by taking long showers › Mitigated by change of behavior - e.g. by visualizing energy consumption › Prerequisite: Integration of energy consuming devices in the home "If you cannot measure it, you cannot improve it." - Lord Kelvin

3. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 3 Home automation integration › Home Automation consists of multiple subdomains › With different communication requirements › Multiple standards and vendors and communication standards exists within each subdomain › It cannot be assumed that all devices are controlled by the same entity › (would make integration task easy) › Approaches to integration › Standardization (as in telecom) › Co-existence og protocols › (communication through homeport) Lighting Entertainm ent HVACSecurity

4. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 4 requirements › Functionality › Connect home automation devices to achieve improved comfort, security, and optimized energy consumption › Business requirements › The architecture should, to a large degree, support current business models › It should not require vendors to give full access to devices › The architecture should have no impact on existing end-product designs › Open to newcommers - no single commercial entity should control infrastructure

5. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 5 Architectural quality requirements › Modifiability › Newly added devices should not affect already deployed equipment › Possible to connect newly added devices to existing applications as well as new ones › Usability › The architecture should enable easy user configuration - zeroconf, etc. › Scalability › Hundreds of devices › Should scale to low end devices to ensure cost efficiency

6. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 6 LAYER VIEW Bridgelayer relays commands to en from devices Service layers presents functionality through REST/HTTP interface Service composites and controllers compose functionaloty End-devices connected to subsystems. E.g. Z-wave devices

7. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 7 Use of web-technology › Motivation › Low barrier-of-entry: › Most platforms supports › HTTP, URLs and HTML/XML/json › Device, programming language and service independence › Easy to implement › HTTP metods with semantics: › GET, PUT, POST, DELETE › Clients and servers only has to support those commands - little required pre-knowledge › Has enough expressive power › Demonstrated on the web › Enables use of mash-up technology › Implementation › Url hierarchy › services › composites › subscriptions - push and pull (streaming) › gui › Accept-header determines content-type of reply › XML, plain, HTML, json › Browser can be used for inspection › XML schemas for basic types

8. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 8 Sample deployment 8 ZigBeeZ-wave XYZ heterogeneous network service protocol

9. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 9 DEPLOYMENT VIEW

10. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 10 Composite service - example › Simple switch-lamp composite › Composite subscribes to switch events › Use HTTP-streaming › GET subscriptions/subscribe/services/switch › When event is received the lamp state is toggled › PUT services/lamp ‘on’ › Composite can be reconfigured › PUT services/switch-lamp-composite/lamp ‘services/lamp-2’ › PUT services/switch-lamp-composite/switch ‘services/switch-2’

11. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 11 Different types of users › End-user (normal use) › Perceives the system only though devices (lamps, switchs outlets, panel displays, etc.) › End-user (configuration/installation) › Access system though user-interface(PC app, web-browser, cell phone, or similar.) › End-device vendor › Does have to know the existence of the Homeport system › Controller/composition developer › Use services via HTTP/REST. › Gateway developer › Responsible for presenting device functionalty through HTTP/REST interface (have to be a sub-system expert) › Based on standard libraries

12. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 12 summary and future work › We have seen that › Different technologies can co-exists (zwave and zigbee) › Commercial vendors are willing to partly open up systems › as long as they remain in control › System requires no updates to end-devices › (when e.g. new devices are introduced) › Subsystem protocol updates are localized (zwave does not affect zigbee) › Currently we are working on zeroconf service and device discovery › Focus has been on the lighting domains - needs to be expanded (currently working on heating system) › Access policies to ensure safe operation › Energy consumption of infrastructure (currently ~5 watt per infrastructure node)

13. 21/05/2010 AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 13 thank you - Questions?