Configuring the Switch
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UPnP
Universal Plug and Play (UPnP) is a set of protocols that allows devices to connect
seamlessly and simplifies the deployment of home and office networks. UPnP
achieves this by issuing UPnP device control protocols designed upon open,
Internet-based communication standards.
The first step in UPnP networking is discovery. When a device is added to the
network, the UPnP discovery protocol allows that device to broadcast its services to
control points on the network. Similarly, when a control point is added to the network,
the UPnP discovery protocol allows that control point to search for UPnP enabled
devices on the network.
Once a control point has discovered a device, its next step is to learn more about the
device and its capabilities by retrieving the device's description from the URL
provided by the device in the discovery message. After a control point has retrieved
a description of the device, it can send actions to the device’s service. To do this, a
control point sends a suitable control message to the discovered device’s URL for
the service (provided in the device description).
When a device is known to the control point, periodic event notification messages
are sent. A UPnP description for a service includes a list of actions to which the
service responds and a list of variables that model the state of the service at run
time.
If a device has a URL for presentation, then the control point can retrieve a page
from this URL, load the page into a web browser, and depending on the capabilities
of the page, allow a user to control the device and/or view device status.
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