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Universal Plug and Play

Universal Plug and Play. Cheng, Ming-Chun. Overview.

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Universal Plug and Play

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  1. Universal Plug and Play Cheng, Ming-Chun

  2. Overview • Universal Plug and Play (UPnP) is an architecture for pervasive peer-to-peer network connectivity of PCs of all form factors, intelligent appliances, and wireless devices. UPnP is a distributed, open networking architecture that leverages TCP/IP and the Web to enable seamless proximity networking in addition to control and data transfer among networked devices in the home, office, and everywhere in between.

  3. Benefits • No device drivers - common protocols. • Media and low-level (transport and below) independent. • UPnP devices can be implemented using any programming language, and on any operating system. • UPnP leverages HTTP and the family of browser technologies. • UPnP enables vendor control over device UI and interaction using the browser.

  4. Control point

  5. Six basic functions(1/2) • device addressing • device discovery • device description • action invocation • event messaging • presentation human interface UPnP is a protocol for data transmission

  6. Six basic functions(2/2)

  7. Device addressing • The addressing layer is where control points and devices obtain their IP addresses. The addresses can be hardwired or come from a DHCP server, or devices can use Auto IP to assign an IP address.

  8. Device discovery & description • When a device is added to a network, the device advertise itself. • A control point can search the network for devices. • Once a control point discovers a device, the device provides a description of itself and the services it provides. (XML document)

  9. Action invocation • To initiate device action, a control point sends a control message using the definitions from the device-description document. To exchange information, the control layer uses a W3C (World Wide Web Consortium) draft standard, SOAP (Simple Object Access Protocol).

  10. Event messaging • A device need to report its status to one or more control points. • It’s based on a basic push model. Device send events only to control points that subscribe to a device’s events.

  11. Presentation human interface • Each device can have a unique presentation, or Web home page. It sends the home-page URL to control points as part of its description.

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