Serving embedded content via web applications: model, design and experimentation
EMSOFT '09 Proceedings of the seventh ACM international conference on Embedded software
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ICWE'10 Proceedings of the 10th international conference on Current trends in web engineering
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UIC'10 Proceedings of the 7th international conference on Ubiquitous intelligence and computing
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ACM Transactions on the Web (TWEB)
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In this paper, we show that Web protocols and technologies are good candidates to design the Internet of Things. This approach allows anyone to access embedded devices through a Web application, via a standard Web browser. This Web of Things requires to embed Web servers in hardware-constrained devices. We first analyze the traffics embedded Web servers have to handle. Starting from this analysis, we propose a new way to design embedded Web servers, using a dedicated TCP/IP stack and numerous cross-layer off-line pre-calculation (where information are shared between IP, TCP, HTTP and the Web application). We finally present a prototype -- named Smews -- as a proof of concept of our proposals. It has been embedded in tiny devices (smart cards, sensors and other embedded devices), with a requirement of only 200~bytes of RAM and 7~kilo-bytes of code. We show that it is significantly faster than other state of the art solutions. We made Smews source code publically available under an open-source license.