1. WebTag:
Smart Tag with Embedded Web Server
Juan Jose Echevarría, Jonathan Ruiz-de-Garibay, Juan Ignacio Vazquez
Maite Álvarez, Ana Ayerbe

2. Outline
 Motivation
 WebTag Concept
 Architecture
 TCP/IP stack
 Compression
 Security
 Evaluation
 Conclusions
 Future Work
WebTag: Smart Tag with Embedded Web Server

3. Motivation
 Use of radiofrequency identification systems in
traceability and asset tracking growing every day.
 Systems are getting expert adding more
functionalities.
 Theuse of sensors provide information about the
product conditions.
WebTag: Smart Tag with Embedded Web Server

4. 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

5. 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

6. Architecture
 Same architecture than other smart tags
WebTag: Smart Tag with Embedded Web Server

7. Present Prototype
 Ethernet interface
 MS430 ultralow-power microcontroller (Texas)
 Set of sensors:
 Temperature
 Humidity
 Luminosity
 TCP/IPstack
 RTC (Real Time Clock)
WebTag: Smart Tag with Embedded Web Server

8. 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

9. 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

10. Security
 Login
 3 failed attempts blocks access
 Basic encryption
 Xor
WebTag: Smart Tag with Embedded Web Server

11. 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

12. Conclusions
 The first state presents good results.
 Web browser to surf contents.
 Access control to the tag.
WebTag: Smart Tag with Embedded Web Server

13. Future Work
 Include NFC capabilities
 Server improvements
 Improve compression
 Power management
WebTag: Smart Tag with Embedded Web Server

14. Thank you
 Jonathan Ruiz-de-Garibay Pascual
jonathan.garibay@deusto.es
 MoreLab – Mobility Research Lab
http://www.morelab.deusto.es
WebTag: Smart Tag with Embedded Web Server