Transcript No Slide Title

Implementing Universal Plug
And Play In Smart Objects
And Intelligent Appliances
Bengt Christensson
CTO
Axis Communications
Session Overview
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Technology trends
Challenges and requirements
Solutions to date and the
Universal Plug and Play Way
Implementation
Demo
Call to action
Technology Trends
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Focus shifting from connectivity
to services
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More devices/services will be networked
Use your time efficiently
Ubiquitous communications
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Anywhere, anything and intuitive, too
Useful bandwidth available
Home networking
Devices, PCs And
Services Interconnect
Services
Technologies converge, devices don’t
Challenges
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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...
Protocol Requirements
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“Automatic networking”
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Scalability
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Work in serverless environments and
leverage directory services, if available
Dynamic ad hoc environments
Flexibility
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Address assignment, naming, discovery,
and service identification
Support device and service individuality
Open standards-based
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Internet RFCs, public source
Solutions To Date
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Ad hoc (serverless, peer-to-peer)
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Manual IP address assignment, ARP
No intuitive naming
SLP, SMB, Salutation, “flood-ping”
Configured (server-based)
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DHCP, BOOTP, RARP
DNS, WINS
Directory (LDAP, NDS, SLP, Salutation)
The Universal Plug
And Play Way
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Works in both ad hoc and
configured environments
Ad Hoc
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Configured
Address
Naming
AutoNet
Multicast DNS
DHCP
DNS
Discovery
Simple Discovery
Directory service
XML and XSL style sheets in the device
define service and interaction
Client Components
Applications
ADSI
Universal Simple Service
XML
Plug and
Discovery
Play
provider
TCP/IP stack
LDAP
WINSOCK
NDIS
NIC
Smart Object Components
Device functions
Simple
Discovery (~4k)
HTTP (~20k)
AutoNet
DHCP
TCP/IP stack (~40k)
Physical media
XML, XSL
schema
Universal Plug And Play In Action Ad Hoc
1. DHCP broadcast
(Timeout)
2. Assign AutoNet address
3. DNS name multicast
4. Announce service
(Timeout - wait for requests)
5. Discover service
7. Response to discover
8. GetXMLschema
9. XML schema
Universal Plug And Play In Action Configured
1. DHCP broadcast
2. Address from DHCP server
3. Name unicast to DNS server
5. Listener Get_HTTP XML
6. Directory updated by listener
7. Device-specific negotiation
8. LDAP query directory
Server
4. Announce service to listener
Packet Examples
Announce
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HTTP packet data example
ANNOUNCE * HTTP/1.1
HOST: *
Location: http://170.1.128.135/description.xml
Object-Class: printer
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Multicast UDP packet
Packet Examples
Discover and response
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Discover
DISCOVER (objectClass=printer)
HTTP/1.1
HOST: 172.*.*.*
Request-ID: 54
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Response to discover
HTTP/1.1 302 Found
Request-ID: 54
Location: http://172.1.128.135/description.xml
Object-Class: printer
Axis Camera Example
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Implementation
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Network-attached
surveillance camera
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Self-contained with TCP/IP
and HTTP support
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UPnP with XML/XSL
description
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Approx. 40 k bytes for
UPnP needed
XML Schema
Axis Camera
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Key elements
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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
‘Device Browser’ Example
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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)
Live Demo
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Showing UPnP
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Device discovery - ‘Device Browser’
Device interaction - XSL Style Sheets
PC
Ethernet
Camera
Printer
CD tower
Documentation
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Simple Service Discovery Protocol
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Automatic Private IP Addressing
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http://search.ietf.org/internet-drafts/draftcai-ssdp-v1-00.txt
http://www.ietf.org/internet-drafts/draftietf-dhc-ipv4-autoconfig-03.txt
Multicast DNS (name resolution)
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http://search.ietf.org/internet-drafts/draftmanning-multicast-dns-01.txt
Documentation
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White paper
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http://www.axis.com/products/document
ation/UpnP.doc
Home Networking & Universal Plug
and Play web sites
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http://www.microsoft.com/homenet
http://www.upnp.org
Call to Action
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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!