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 [email protected]
MoreLab – Mobility Research Labhttp://www.morelab.deusto.es