D120.de/forum

Hi, I don't think SSDP has anything to do with your null pointer error. Actually, I am sure it has nothing to do with it . So, you'll have to check your code... Regarding the NT and USN fields: check page 13 of the UPNP device architecture, where it explains the Notify ssdp:alive. There you can see ...

...And I forgot to answer this: "Is it correct, that the Control Point sends Notifies and answers M-Searchs in order to be discoverable in the network?" The control point doesn't have to be discoverable, it must be able to discover the devices. ALL OF THEM. The devices are the ones that should be di...

Hello, First of all, a couple of comments regarding roles of devices and control points, that I believe will help clarify the problem: Control points are clients , and the Devices are the servers providing/offering a given functionality. That's why everything that is a upnp device must publish an xm...

Dear Students,

Together with my colleague Dr. Aitenbichler, we've decided to allow the exercises to be turned in until Friday 18.01.2007 midnight.

However, if you submit the exercise today, it will be taken into account for the correction.

Best regards,
Fernando Lyardet

Hello, A few details following another question from today's Q&A: Response to an "ssdp:discover" event: Answer is via unicast UDP, by sending it directly to the device that sent the M-SEARCH (for details on how to get that address see the other especific posting). Be careful that there are 2 cases: ...

Hello, If you are using a firewall, its settings may affect the tests. How to set the windows firewall for upnp is described here: http://technet.microsoft.com/en-us/library/bb490616.aspx#EFAA . Although it is specific for the Microsoft UPnP framework, the settings are similar. Regards, Fernando

Hello, Today in the Q&A there was a question regarding HTTPMU responses. The specification states: "To be found, a device must send a UDP response to the source IP address and port that sent the request to the multicast channel" . The specification is correct, but can be confusing. Here's a code exa...

Hello, [font=Courier New] 1) How often and with which values must a device/service answer to a search request which it matches? [/font] To answer, I'll refer to the Upnp Documentation (upnp Device Architecture 1.0 - Document revision date 20.07.2006) About How Soon: PAGE 14: "Advertisements in the i...

The old Java-based upnp Toolkit from Intel is available on the lecture notes page of the Internet Praktikum.

Linux Support:
Porting of the intel upnp sdk : http://linuxdevices.com/links/LK9819585123.html (that points to http://upnp.sourceforge.net/.

Also: http://pupnp.sourceforge.net/

Hi,
I will post the version of the java tools I have

Fernando

Hi, 1) Good question. The control point can be a device also, but under Upnp doesn't have to be. It can be a control point only. However, it must be discoverable and provide a description but no services or notifications, that's all. Actually, if you make the device work first, it should be no probl...

Hi, Last class there was an interesting question regarding the interaction between a server and an application -browser for instance-, and how do they decide to close the connection. The procedure is rather well defined, and is documented in the HTTP RFC, in the following section: http://www.w3.org/...

The grades are available at:

http://elara.tk.informatik.tu-darmstadt ... s/ss07/IP/

There should be also a printed version in the corridor.

Best regards,
Fernando Lyardet
Internet Praktikum SS07

Hello,

I put some slides redarding SSDP, and how to create, send and listen using UDP multicast sockets.

Best regards,
Fernando