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RE: [hntf] Summary of the joint session on Device discovery

From: Russell Berkoff <r.berkoff@sisa.samsung.com>
Date: Mon, 14 Nov 2011 09:26:25 +0000
To: "public-web-and-tv@w3.org" <public-web-and-tv@w3.org>
Message-ID: <6581747E1C72294898320DAEB1F7A0710B4675FF@ex10mail>
Hello Giuseppe,

I have some concerns about the sudden appearance of a nexus between Web Intents and Home Network requirements in developed in the HNTF.

I don’t recall Web Intents topic ever being discussed in HNTF and would have some significant concerns with merging the Web Intents and Home Network scopes.

If Web Intents aspires to be compatible at some level with Home Networks that’s fine. If there is a suggestion that Web Intents is a primary (only) discovery mechanism for home-networks that’s not so fine.

Let me start by saying that Web Intents service-centric architecture is contrary to Home Networks device-centric architecture. This will potentially limit the types of HN devices which could be offered.

I think HNTF may want to continue to meet until there is a consensus on the disposition of the TF's work!

Russell Berkoff

> -----Original Message-----
> From: Giuseppe Pascale [mailto:giuseppep@opera.com]
> Sent: Monday, November 14, 2011 12:24 AM
> To: public-web-and-tv@w3.org
> Subject: [hntf] Summary of the joint session on Device discovery
> Hi all,
> sorry for the late report.
> This is a summary of the joint session on Device discovery between Web
> and TV IG and DAP WG during TPAC 2 weeks ago.
> If something is not clear, feel free to ask.
> - I set the context of the home network task force, highlighting
> identified gaps that the DAP WG now needs to address:
>   * discovery/advertisement to allow Web applications to be aware of
> services available on the home network, and/or to advertise themselves
> on the home network.
>   * communication: need to relax same origin restrictions (when CORS is
> not
> supported)
> See presentation at:
>   http://people.opera.com/giuseppep/hntf/

> - Clarke presented a demo of the CableLabs/Opera proposal
>   http://www.w3.org/mid/CAE1B1EF.14108%25c.stevens@cablelabs.com

> - Dave Raggett presented a demo of the Webinos proposal
>   http://www.w3.org/mid/4EBCF297.8070203@w3.org

> - The discussion focused on security concerns triggered by exposing the
> local network to Web applications, and on possible mechanisms to reduce
> the surface of attack. Some security policy needs to be applied between
> discovery requests and responses before attempting device pairing and
> control. Exposing service details such as its address on the local
> network or its exact identity may not be needed: the UA could perhaps
> rather expose an opaque object to the JavaScript to communicate with
> services identified by the type of service they fulfill. Concerns about
> the idea of allowing application to coomunicate with UPnP devices
> diretly since these devices may have not been designed for this
> scenario so probably not enough tested for this scenario.
> - Web Intents proposal was presented
>   www.weintents.org
> - The Web Intents proposal seems to be going in a similar direction,
> exposing services to Web applications through a broker.
> - No decision was taken to adopt/reject any of the proposals. DAP will
> work on Web Intents per its charter. It is unclear at this stage
> whether Web Intents solves discovery requirements identified in the
> Home Networking Task Force, in particular in terms of supporting the
> protocol supported by the device that exposes the service. The two
> efforts may not result in a single API in the end.
> - DAP will work on Web Intents in a dedicated task force and specific
> mailing-list and, pending WebApps gets re-chartered, as a joint
> deliverable between WebApps and DAP. Discussions on device discovery
> should take place in that task force as well, unless it appears clear
> that two APIs need to be defined. On-going discussions on DAP main
> mailing-list might conclude one way or the other, or leave it up to the
> task force to solve the issue:
>   http://lists.w3.org/Archives/Public/public-device-

> apis/2011Nov/0054.html
> Participants of the Home Network TF are encouraged to join DAP, where
> further discussions will take place. We are not going to make any work
> in this IG unless required at some point in future.
> Thanks to all TF members for their contribution and looking forward to
> your contribution in DAP.
> --
> Giuseppe Pascale
> TV & Connected Devices
> Opera Software

Received on Monday, 14 November 2011 09:26:38 UTC

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