Download - IoT Day 2013 - Madrid
WALTER COLITTI (@waltercolitti) VRIJE UNIVERSITEIT BRUSSEL
Open IP and Web Technologies for the Internet of Things
2
“Big” devices
Things on the Internet
3
“Small” devices
Intranet of Things
Different protocols = no interoperability
Gateways = architectural complexity
Gateways = no integration with the Web
4
Internet background
Interoperability
End-to-End principle
Why not repeating the IP success in IoT?
Embedded IP Technologies
6
Promotes IP as network technology for embedded devices
Embedded IP – Standards
6LoWPAN
RPL
Enables IPv6 over constrained networks
Routing protocol for Low-power Lossy Networks
7
6LowPAN – Advantage
Application
Transport
Internet (IPv4/IPv6)
Link
INTERNET
LAN
Wireless
Sensor
Network
Internet (IPv4/IPv6)
Link
Application
Transport
Internet (IPv6)
Link
(802.15.4) Link
(802.15.4)
6LoWPAN
TCP/IP enabled
Sensor mote
LAN/Internet
border router
6LoWPAN
Internet
(IPv6)
Internet/WSN
border router
Internet (IPv4/IPv6)
Link
Application
Embedded Web Technologies
(Web of Things)
9
Embedded Web - Advantage
The Web is everywhere
REST
XML
JSON
URI
HTTP
10
Embedded Web - Problem
REST/HTTP complex for tiny devices Relies on TCP
Complex observation mechanisms
No multicast support
REST/HTTP not designed for IoT/M2M apps
Long-lived transactions
Constrained Application Protocol (CoAP)
12
CoAP standard
Constrained Application Protocol
CoRE Working Group
HTTP functionalities for constrained devices
Extra functionalities added
13
Transaction layer for message exchange
CoAP principle
Dual Layer
Request/Response layer for resource manipulation
Features Small message overhead (4 bytes binary header)
Client can observe resource status changes
CoAP
UDP
IP
HTTP
TCP
IP
Request/
Response
Transaction
14
CoAP Performance
Response Time
15
CoAP Performance
(server mote)
Energy consumption
16
HTTP – CoAP Proxy
Client Proxy Server
http:// sensor1.contikigh.com/readings
http://193.226.5.150/readingsGET /readings HTTP/1.1Host: sensor1.contikigh.com coap:// sensor1.contikigh.com/readings
coap:// [aaaa::c30c:0:0:365]/readingsCON GETURI -Path: readings
CON 2.00{“sensor”:”212:7400:2:202”,”readings”:{“hum”:50,”temp”:26.8}}
HTTP/1.1 200 OKHumidity: 50, Temperature: 26.8
