Design of a Web-based Distributed Location-aware Infrastructure for Mobile Devices

WoT2010 @ Percom, Mannheim, Germany29 March 2010Vlad Trifa, Dominique Guinard, Philipp Bolliger, Samuel Wieland

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

The Internet of Things

‣ Networked devices everywhere

‣ Tons of different devices ‣ Capabilities/functions‣ Applications/middlewares‣ Networking protocols

‣ Internet connectivity‣ Cheap‣ Ubiquitous

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

WoT: Use the Web to combine heterogeneous mobile devices to

create interactive ad-hoc applications!

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

Social Web

Real-time Web

Programmable WebSemantic Web

Physical Web

Web of Things

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

Local: Web-enabled Things?

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

RESTful SunSpot‣ Embedded NanoHTTPD‣ Talks HTTP (over 802.15.4)‣ Becomes a Web device

‣ Properties and functions are Web resources, so can be‣ Browsed‣ Bookmarked‣ Shared

‣ But also use twitter, send emails, chat, etc..

D. Guinard, V. Trifa, T. Pham, and O. Liechti. Towards Physical Mashups in the Web of Things. In Proceedings of the 6th International Conference on Networked Sensing Systems (INSS 2009), 2009.

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

Example application: Energie Visible

Gateway (IP:10.1.1.5)

Sensors(Ploggs)

Electric appliances

Web / Mobile Interface

GET http://10.1.1.5/energymonitor/ploggs/*

[{

"deviceName": "ComputerAndScreen",

"currentWatts": 50.52,

"KWh": 5.835,

"maxWattage": 100.56

},

"deviceName": "Fridge",

"currentWatts": 86.28.,

"KWh": 4.421,

"maxWattage": 288.92

}, {...}]

D. Guinard and V. Trifa. Towards the web of things: Web mashups for embedded devices. In 2nd Workshop on Mashups, Enterprise Mashups and Lightweight Composition on the Web (MEM 2009), Madrid, Spain, April 2009.

Let’s make it global.

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

Infrastructures

‣ We propose an infrastructure for WoT‣ scalable‣ flexible ‣ so, must be distributed

‣ The real world is physical. Everything has a location.‣ You interact with things around you‣ How to leverage the infrastructure?

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

Location Models

Geometric‣ coordinate reference system(s)‣ convenient for exact measurements‣ e.g.: GPS 33°94’, 37°2’

Symbolic‣ uses identifiers‣ e.g.: places hierarchy

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

Explore the world around you...

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

Towards physical mashups

‣ SunSpot gets periodically

‣ Displays the energy consumption in the room

‣ Mobile energy meter‣ Location-aware

‣ Problem: mapping here/ to current location (bootstrap)

‣ Closest gateway

GET http://here/energymonitor/ploggs/*

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

RedPin comes to the rescue

‣ Provides room-level accuracy ‣ Uses existing hardware‣ Very easy to setup and to maintain ‣ Released as open source

www.redpin.org

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

Take home notes

‣ Intranet of things is nice and useful‣ But it’s time to think larger‣ Leverage physical location of nodes of the WoT‣ Leverage the infrastructure to localize things‣ Devices don’t need to know where they are

Web of Things @ Percom Vlad Trifa - SAP/ETH Zurich

Thanks for your attention !

ありがとうございました！

www.webofthings.com