ZyXEL Communications P-335WT Manuel d'utilisateur télécharger pdf (Page 5)

MAN: ssdp:discover

MX: 10

ST: ssdp:all

All control points are required to respond to this message by sending back a similar

message via UDP unicasting back to the device, announcing which UPnP proﬁles

the control point implements. For every proﬁle it implements one message is sent:

HTTP/1.1 200 OK

CACHE-CONTROL:max-age=1800

EXT:

LOCATION:http://10.0.0.138:80/IGD.xml

SERVER:SpeedTouch 510 4.0.0.9.0 UPnP/1.0 (DG233B00011961)

ST:urn:schemas-upnp-org:service:WANPPPConnection:1

USN:uuid:UPnP-SpeedTouch510::urn:schemas-upnp-org:service:WANPPPConnection:1

The above is a slightly edited response that is sent by an Alcatel/Thomson Speed-

touch ADSL modem. Some implementations of the UPnP stack do not seem to

send responses back at all.

The response message contains a header called LOCATION, which is a URL where

a ﬁle in XML format can be downloaded which describes the services that the

control point implements. There is no default location for this ﬁle. In some control

points, such as the OvisLink MU-5000FS, a Linux/Samba based network storage

device (also available from other vendors), the LOCATION header even diﬀers between

reboots as the port on where the webserver runs is dynamically assigned.

At a regular interval control points have to send a message to announce their ser-

vices. A notiﬁcation message is the same as a response message to a discovery, but

they are sent to the UPnP broadcast address (239.255.255.250) on port 1900 via

UDP.

Also, the header ST is replaced by the header NT, but with similar values.

3.2.3 Step 2: Description

Every proﬁle oﬀers a description of itself and the services it oﬀers and makes this

available via XML. The XML ﬁle can be found at the URL in the LOCATION header

from the discovery stage.

3.2.4 Step 3: Control

The third step in the protocol is called “control”, which means that a device can

ask a control point to request a service on the client’s behalf. Requesting a service

is done by sending a SOAP request to the so called “control URL” of the control

point, with the right parameters. The control URL for a speciﬁc proﬁle can be

found inside the <service> tag in the XML ﬁle found at the URL in the LOCATION

header. As an example the <service> tag from the Thomson Speedtouch 510 for

the WANPPPConnection proﬁle looks like this:

<serviceType>urn:schemas-upnp-org:service:WANPPPConnection:1</serviceType>

<serviceId>urn:upnp-org:serviceId:wanpppc:pppoa</serviceId>

<controlURL>/upnp/control/wanpppcpppoa</controlURL>

<eventSubURL>/upnp/event/wanpppcpppoa</eventSubURL>

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