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Chapter 13. UPnP > BROWSING A UPNP HOME NETWORK

BROWSING A UPNP HOME NETWORK

So far in this chapter we have explored the main elements and protocols of the UPnP standard. Now it is time to look at a typical browsing protocol sequence on a UPnP-based home network. The process is illustrated in Figure 13.4.

Basically, the user control point sends an SSDP discovery request to the controlled device on the network and waits for a response in the form of a URL. Once a response has been received, the discovery client software module will then send a HTTP GET command to the discovery server that is located on the controlled device. The server will then respond to the request. The device description service on the user control point will now take over and send a number of GET commands to the description server. The server responds by sending the user control point an icon, a name, and an SCPD. The visual navigation subsystem will then allow a home-networking user to select the device icon on the display system (for instance, a television).


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