HomeWeb: An Application Framework for Web-based Smart Homes
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The document outlines the development of an application framework called homeweb for web-based smart homes, emphasizing the integration of IPv6 and RESTful services for interoperability among diverse embedded devices. It presents a resource-oriented architecture that enables efficient web-enabling of sensors and monitoring systems in home automation. Future work aims to enhance the framework with advanced technologies, promoting energy-efficient and secure smart home solutions.
HomeWeb: An Application Framework for Web-based Smart Homes
- 1. HomeWeb: An Application Framework for Web-based Smart Homes Andreas Kamilaris, Vlad Trifa and Andreas Pitsillides Networks Research Laboratory, University of Cyprus
- 2. Motivation University of Cyprus • Merging of computing with physical things. • The Internet can reach out into the real world. • The Internet of Things. • Most of the current smart home solutions do not involve open systems and have been developed to provide solutions to some application-specic scenarios (medical, care for the elderly). • How to interconnect heterogeneous embedded devices? • What about interoperability? Flexibility?
- 3. The Internet for Home Automation University of Cyprus X10 KNX ZigBee IPv6 Network Size 2^8 2^16 2^16 2^64 per subnet Data Rate 20b/s 9.6kb/s 20-250kb/s 250kb/s...1Gb/s Interface custom solutions app-level app-level gateway UDP, TCP, RESTful gateway Web Cost low high medium low Installation low high low low Overhead Connectivity low medium medium high Security none high medium medium “Internet technology, utilizing IPv6, will become the future standard in home automation.” Matthias Kovatsch et al., Embedding Internet Technology for Home Automation, in Proceedings of ETFA, Bilbao, Spain, September 2010.
- 4. Background Information University of Cyprus The Web of Things is about reusing well-accepted and understood Web principles to interconnect the quickly expanding ecosystem of embedded devices, built into everyday smart things. The WoT practice mainly follows these steps: 2. Connect embedded devices to the Internet, through IPv4 or IPv6. 3. Embed Web servers on these devices. 4. Model their services in a resource-oriented way. Directly Web-enabling devices Vs using a Gateway.
- 5. Background Information University of Cyprus REST is a lightweight architectural style which basically defines how to use the HTTP application protocol as an application interface to the world of smart objects. A Resource-oriented Architecture is about four concepts: 2. Resources. 3. Their names (URIs). 4. The links between them. 5. Their representations (HTML, JSON, XML). Resources can be manipulated with: 2. GET to retrieve a representation of a resource. 3. POST represents an insert or update. 4. PUT to alter the state of a resource. 5. DELETE to delete resources.
- 6. Building a Web-based Smart Home University of Cyprus • Use the Web as a standard, to realize the notion of the smart home. • Development of a resource-oriented application framework for future smart homes. • Utilization of REST. • Support for concurrent, multiple Web clients. • The framework promotes the creation of physical mashups in any programming language that supports HTTP.
- 7. HomeWeb Architecture University of Cyprus HomeWeb Client Application Restlet-GWT XML JSON Web API Server Application Framework Restlet
- 8. System Architecture University of Cyprus Resource URI Parameters REST Method Return Value Temperature - GET text/plain The HomeWeb Humidity - GET Applicationtext/plain Bedroom Illumination - GET text/plain Leds Color (Red, PUT text/plain Green, Blue) Laundry Room Bathroom • IPv6-based Wireless Sensor Network of Telosb sensor motes. Living Room • Implementation in TinyOS using blip. Kitchen • Each sensor is a small Web server, which offers sensing services through a RESTful interface. • All interactions with embedded devices are done via standard HTTP requests.
- 9. Web-enabling Sensor Devices University of Cyprus • Device Discovery: • Multicast Discovery Protocol. • Similar to WS-Discovery. • Transmit a single URL instead of a heavy SOAP/XML payload. • Service Description: • Web Applications Description Language (WADL). • Similar to WSDL. • An XML-based language that provides a machine- readable description of HTTP-based Web applications.
- 10. Web-enabling Sensor Devices University of Cyprus • Web Messaging for Event-driven Scenarios: • Pull Vs Push. • Client-server model not appropriate for event-driven scenarios. • RESTful Message System (RMS) is a push-based, lightweight publish/subscribe messaging, suited for embedded devices. • HTTP Caching: • Integrate a Web cache in HomeWeb framework. • Works only for GET requests using the expiration model for determining freshness of resources.
- 11. Putting them all together… University of Cyprus
- 12. Putting them all together… University of Cyprus “If the illumination in the living room is less than 50% and the temperature in the kitchen is greater than 25 degrees, then turn on the red led of sensor7 and the green led of sensor6.”
- 13. Evaluation University of Cyprus • Multiple family members are interacting concurrently with their home devices through the Web. • Four sensor devices in a star topology around the base station.
- 14. Preliminary Evaluation University of Cyprus 1.6 1.4 1.2 Time (seconds) 1 0.8 0.6 0.4 0.2 0 REST SOAP • A multi-hop Web-based IPv6 WSN deployment inside a real smart home environment. • REST Vs WS-*
- 15. Concluding Remarks University of Cyprus • The Web has the potential to become a standard in home automation. • An IPv6-based WSN installation in home area networks is feasible and it offers acceptable performance. • The application of Web technologies such as HTTP caching and push techniques in the WSN domain can improve overall performance. • Wide-scale connectivity and interoperability are guaranteed.
- 16. Future Work University of Cyprus • More thorough evaluation. • Incorporate more advanced technology in HomeWeb (residential smart meters, lighting/HVAC control). • Towards the design of energy-efficient, sustainable, flexible and secure Web-based smart homes. • Web-based smart homes as real-time platforms, to engage people to sense and shape their urban environment, for the vision of a real-time, digital city*. * Andreas Kamilaris, Nicolas Iannarilli, Vlad Trifa, and Andreas Pitsillides. Bridging the Mobile Web and the Web of Things in Urban Environments. In Urban Internet of Things Workshop, at IoT 2010, November 2010.
- 17. Thanks for your attention! Contact Details: Andreas Kamilaris (camel9@gmail.com)