Implementing Universal Plug And Play In Smart Objects And Intelligent Appliances Bengt Christensson CTO Axis Communications

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Implementing Universal Plug And Play In Smart
Objects And Intelligent AppliancesBengt
Christensson CTOAxis Communications
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Session Overview

• Technology trends
• Challenges and requirements
• Solutions to date and the Universal Plug and
  Play Way
• Implementation
• Demo
• Call to action

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Technology Trends

• Focus shifting from connectivity to services
• More devices/services will be networked
• Use your time efficiently
• Ubiquitous communications
• Anywhere, anything and intuitive, too
• Useful bandwidth available
• Home networking

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Devices, PCs And Services Interconnect
Services
Technologies converge, devices dont
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Challenges

• Simplicity
• Robustness - always on
• Scalability- ad hoc/configured
• Interoperability, manageability, security
• Lightweight cost-effective technology
• Building networking applications
• Wide range of different devices and services...

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Protocol Requirements

• Automatic networking
• Address assignment, naming, discovery, and
  service identification
• Scalability
• Work in serverless environments and leverage
  directory services, if available
• Dynamic ad hoc environments
• Flexibility
• Support device and service individuality
• Open standards-based
• Internet RFCs, public source

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Solutions To Date

• Ad hoc (serverless, peer-to-peer)
• Manual IP address assignment, ARP
• No intuitive naming
• SLP, SMB, Salutation, flood-ping
• Configured (server-based)
• DHCP, BOOTP, RARP
• DNS, WINS
• Directory (LDAP, NDS, SLP, Salutation)

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The Universal Plug And Play Way

• Works in both ad hoc and configured environments

• XML and XSL style sheets in the device define
  service and interaction

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Client Components
NIC
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Smart Object Components
Device functions
Physical media
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Universal Plug And Play In Action - Ad Hoc
(Timeout)
(Timeout - wait for requests)
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Universal Plug And Play In Action - Configured
Server
6. Directory updated by listener
7. Device-specific negotiation
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Packet Examples Announce

• HTTP packet data example
• ANNOUNCE HTTP/1.1
• HOST
• Location http//170.1.128.135/description.xml
• Object-Class printer
• Multicast UDP packet

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Packet ExamplesDiscover and response

• Discover
• DISCOVER (objectClassprinter)
• HTTP/1.1
• HOST 172...
• Request-ID 54
• Response to discover
• HTTP/1.1 302 Found
• Request-ID 54
• Location http//172.1.128.135/description.xml
• Object-Class printer

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Axis Camera Example

• Implementation
• Network-attached surveillance camera
• Self-contained with TCP/IP and HTTP support
• UPnP with XML/XSL description
• Approx. 40 k bytes for UPnP needed

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XML Schema Axis Camera

• Key elements
• Name spaces definitions
• Device description and functionality
• Support and purchasing information
• References to XSL style sheets for UI
• Refer to white paper for sample code, XML schema
  and XSL style sheets http//www.axis.com/products/
  documentation/ UpnP.doc

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Device Browser Example

• Client runs Device Browser application, based on
  Internet Explorer 5.0
• Discover device
• Fetch description.xml from device
• Parse XML data to extract information
• Present device in view
• User selects device
• Present UI links referred by description.xml
• User selects UI
• Fetch and view the UI (style sheet)

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Live Demo

• Showing UPnP
• Device discovery - Device Browser
• Device interaction - XSL Style Sheets

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Documentation

• Simple Service Discovery Protocol
• http//search.ietf.org/internet-drafts/draft-cai-s
  sdp-v1-00.txt
• Automatic Private IP Addressing
• http//www.ietf.org/internet-drafts/draft-ietf-dhc
  -ipv4-autoconfig-03.txt
• Multicast DNS (name resolution)
• http//search.ietf.org/internet-drafts/draft-manni
  ng-multicast-dns-01.txt

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Documentation

• White paper
• http//www.axis.com/products/documentation/UpnP.do
  c
• Home Networking Universal Plug and Play web
  sites
• http//www.microsoft.com/homenet
• http//www.upnp.org

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Call to Action

• UPnP is work in progress!
• Review your business opportunities with respect
  to UPnP
• Get to understand the principles and general
  requirements
• Study released documentation
• Keep an eye on www.upnp.org
• More great news to come!

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