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Subject: RE: Issue 134 - DPWS - No reliable way to retrieve discoverymetadata of devices

The model I fall back on is that discovery information is available from a Device using Directed Discovery, and that the metadata should not duplicate this information unless necessary.


I think we can solve this problem by making Types and Scopes mandatory in Directed ProbeMatches messages.† This would be similar to the rules around managed Hello sent to a discovery proxy.


What are your thoughts on this solution?


Thanks Elmar



From: Ram Jeyaraman [mailto:Ram.Jeyaraman@microsoft.com]
Sent: Tuesday, December 16, 2008 8:33 AM
To: ws-dd@lists.oasis-open.org
Subject: [ws-dd] Issue 134 - DPWS - No reliable way to retrieve discovery metadata of devices


This issue is assigned the number 134. For further discussions on this issue, please refer to this issue number or use this thread.


From: Elmar Zeeb [mailto:elmar.zeeb@uni-rostock.de]
Sent: Monday, December 15, 2008 3:40 PM
To: Ram Jeyaraman
Subject: New Issue for DPWS


Description: No reliable way to retrieve discovery metadata of devices
Document: wsdd-dpws-1.1-spec-wd-02
Line number:

All type fields in WS-Discovery and DPWS are optional. There should be ONE way to retrieve the types, supported by a device, without probing for every type. As the types should be optional in the discovery metadata, to solve problems related to message size, the types should be listed in the relationship metadata section. The increased message size of WS-Transfer messages is not as problematic as an increased message size within WS-Discovery (UDP fragmentation). At the moment there is no reliable way to retrieve all device types of a device. This problem exists especially for generic clients.

The same problem exists for scopes. This problem is less problematic as scopes don't express the device functionality.

Proposed solution: Make Host field in relationship metadata mandatory and also make types field in the Host field mandatory.

There is no proposed solution for the scopes problem.

  Dipl.-Inf. Elmar Zeeb
  Universitšt Rostock, Fakultšt f. Informatik und Elektrotechnik
  Institut f. Angewandte Mikroelektronik und Datentechnik
  University of Rostock, Faculty of CS and EE
  Institute of Applied Microelectronics and Computer Engineering,
  18051 Rostock
  Tel. : ++49 (0)381 498 - 7262
  Fax  : ++49 (0)381 498 - 7252
  Email: elmar.zeeb@uni-rostock.de
  www  : http://www.imd.uni-rostock.de/, http://www.ws4d.org/

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