WebTag:Smart Tag with Embedded Web Server

Juan Jose Echevarría, Jonathan Ruiz-de-Garibay, Juan Ignacio Vazquez

Maite Álvarez, Ana Ayerbe

WebTag: Smart Tag with Embedded Web Server

Outline

Motivation WebTag Concept Architecture

TCP/IP stack Compression

Security Evaluation Conclusions Future Work

WebTag: Smart Tag with Embedded Web Server

Motivation

Use of radiofrequency identification systems in traceability and asset tracking growing every day.

Systems are getting expert adding more functionalities.

The use of sensors provide information about the product conditions.

WebTag: Smart Tag with Embedded Web Server

RFID vs NFC

Systems are usually based in RFID.

RFID provides only one way communication.

No interaction is allowed.

NFC is bidirectional.

Users can send info/data to the tag.

WebTag: Smart Tag with Embedded Web Server

WebTag Concept

Emulate the evolution of Internet web model in a tag. Bidirectional communication NFC.

Embedded web server will have a small computational power and limited memory.

Complex services that provide advanced features. Allow surfing contents.

The objective is to create a new type of smart tag equipped with a set of

sensors and a micro-embedded web server

WebTag: Smart Tag with Embedded Web Server

Architecture

Same architecture than other smart tags

WebTag: Smart Tag with Embedded Web Server

Present Prototype

Ethernet interface MS430 ultralow-power microcontroller (Texas) Set of sensors:

Temperature Humidity Luminosity

TCP/IP stack RTC (Real Time Clock)

WebTag: Smart Tag with Embedded Web Server

TCP/IP Stack

Based on Andreas Dannenberg stack: is an implementation of the TCP/IP protocol

stack for small 8-bit or 16-bit microcontrollers. is open source. allow only one connection.

No UDP.

WebTag: Smart Tag with Embedded Web Server

Compression

For example Headers TCP/IP lenght: 40 bytes Some fields don’t change during connection Send only the changes

WebTag: Smart Tag with Embedded Web Server

Security

Login 3 failed attempts blocks access

Basic encryption Xor

WebTag: Smart Tag with Embedded Web Server

Evaluation

Tests made through the Ethernet interface

Header compression: 50% Data compression: over 30% Transfer speed: 15kB second RAM usage: 2kB Small memory for sensors captures

Only values with 5% change are stored for memory usage reduction

WebTag: Smart Tag with Embedded Web Server

Conclusions

The first state presents good results.

Web browser to surf contents.

Access control to the tag.

WebTag: Smart Tag with Embedded Web Server

Future Work

Include NFC capabilities

Server improvements

Improve compression

Power management

WebTag: Smart Tag with Embedded Web Server

Thank you

Jonathan Ruiz-de-Garibay Pascualjonathan.garibay@deusto.es

MoreLab – Mobility Research Labhttp://www.morelab.deusto.es