AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE

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

AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 21/05/2010 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 "If you cannot measure light control it, you cannot improve it. " › Wasteful consumption - e. g. by taking long showers Kelvin › Mitigated by change of behavior - e. g. by visualizing energy- Lord consumption Prerequisite: Integration of energy consuming devices in the home 2

AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 21/05/2010 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 HVAC Security › (communication through homeport) Entertainm Lighting ent 3

AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 21/05/2010 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 4

AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 21/05/2010 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 5

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

AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 21/05/2010 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) 7

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

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

AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 21/05/2010 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’ 10

AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 21/05/2010 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 11

AU DEPARTMENT OF COMPUTER SCIENCE FACULTY OF SCIENCE AARHUS UNIVERSITY JEPPE BRØNSTED POST DOC, PHD 21/05/2010 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) 12

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