C
HAPTER
29
| UPnP Commands
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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 control 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 the service responds to 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.
EXAMPLE
UPnP>mode enable
UPnP>
upnp ttl This command displays or sets the TTL value for UPnP messages.
SYNTAX
upnp ttl [ttl]
ttl - The time-to-live (TTL) value for UPnP messages transmitted by
the switch. This is the number of router hops a UPnP packet can
travel before it is discarded. (Range: 4-255)
DEFAULT SETTING
4
COMMAND USAGE
â—† This command specifies the number of router hops a UPnP packet can
travel before it is discarded.
â—† UPnP devices and control points must be within the local network, that
is, within the TTL value for multicast messages.
EXAMPLE
UPnP>ttl 255
UPnP>
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