W3C home > Mailing lists > Public > public-web-bluetooth@w3.org > March 2015

Re: Selecting Bluetooth Adapters

From: Vincent Scheib <scheib@google.com>
Date: Fri, 20 Mar 2015 10:51:55 -0700
Message-ID: <CAK-EfX=dPRkbbeuVGpha0YBC_bcns7y0yvMME63u+wY=xudSTw@mail.gmail.com>
To: Jeffrey Yasskin <jyasskin@google.com>
Cc: "Von Dentz, Luiz" <luiz.von.dentz@intel.com>, "Kis, Zoltan" <zoltan.kis@intel.com>, public-web-bluetooth <public-web-bluetooth@w3.org>
Luiz, would you help educate me regarding why a peripheral would like to
control which adapter is being used? My imagination is having a hard time
thinking of multi-adapter devices and how they work differently.

On Fri, Mar 20, 2015 at 10:24 AM, Jeffrey Yasskin <jyasskin@google.com>
wrote:

> Good point, thanks. I've added a note about exposing adapters for
> peripherals to
> https://docs.google.com/document/d/1BKBY39CeUWzkmEExTml0JUEy2eHD4upixt1_7zqjMkg/edit
> ,
> which is now linked from
> https://github.com/WebBluetoothCG/web-bluetooth/issues/78.
>
> On Fri, Mar 20, 2015 at 7:09 AM, Von Dentz, Luiz
> <luiz.von.dentz@intel.com> wrote:
> > Hi Jeffrey,
> >
> > Perhaps right now it doesn't really add anything since apparently the
> > instanceId can be used to differentiate the same device in different
> > adapters, in case the UA decide to discover in all adapters for
> > example. In the other hand for peripheral role it may be a good idea
> > to have the adapter as an optional parameter when advertising, but
> > perhaps you don't want to add any API related to peripherals right
> > now.
> >
> > On Fri, Mar 20, 2015 at 12:20 AM, Jeffrey Yasskin <jyasskin@google.com>
> wrote:
> >> I'm splitting this from the security thread because I don't see a
> >> security aspect in adapter selection.
> >>
> >> I mentioned the adapters question in
> >>
> https://github.com/WebBluetoothCG/web-bluetooth/issues/22#issuecomment-57359185
> :
> >> I'm not sure it makes sense to expose separate adapters to websites.
> >> At the moment, the UA simply knows how to communicate with Bluetooth
> >> devices in its vicinity, using whatever adapters its machine exposes,
> >> and we don't expose the complication of picking an adapter to the web
> >> page. If we need to in the future, we should be able to add that in a
> >> backward-compatible way.
> >>
> >> Re the scheme for selecting devices and services, check out
> >> requestDevice() in
> >> https://webbluetoothcg.github.io/web-bluetooth/#device-discovery and
> >> the getPrimaryService method in BluetoothDevice:
> >> https://webbluetoothcg.github.io/web-bluetooth/#idl-def-BluetoothDevice
> .
> >> (Note, this is probably going to move to a new class once
> >> https://github.com/WebBluetoothCG/web-bluetooth/pull/73 is reviewed.
> >> Please comment there if you're interested.)
> >>
> >> On Thu, Mar 19, 2015 at 2:47 PM, Kis, Zoltan <zoltan.kis@intel.com>
> wrote:
> >>> Hello,
> >>>
> >>> As an additional issue, I would like to ask how do we handle selecting
> >>> one from possibly multiple adapters.
> >>> There are two basic choices:
> >>> 1. enumeration + management of adapter id’s (e.g. BT address or
> >>> mappings to opaque id’s).
> >>> e.g. Promise<sequence<BluetoothAdapter>>  requestAdapters();
> >>>
> >>> 2. encapsulated by a dialog or selection algorithm managed by the UA
> >>> e.g. Promise<BluetoothAdapter>  requestAdapters();
> >>> where the UA decides whether to take a dialog with the user, or use an
> >>> algorithm in order to select an adapter.
> >>> In addition, we need a property ‘selectedAdapter’ (can be null) and
> >>> and event ‘onadapterchanged’.
> >>>
> >>> Based on experience so far, we'd prefer option 2. This has also been
> >>> used in the Presentation/Second Screen API [1], and it's useful in
> >>> that it does not need to expose adapter id's to web pages, only a
> >>> selected object. Of course, this applies mainly for use cases with a
> >>> single selection (lists are also manageable with some added
> >>> complexity).
> >>>
> >>> A similar scheme could also be used with devices, and services.
> >>> For instance, we could use a
> >>> Promise<BluetoothGATTService> getPrimaryService(BluetoothServiceUuid
> service);
> >>> method for retrieving the primary service (the UA decides the policy
> >>> on how exactly to do that),
> >>> and in addition, we need events for serviceadded, serviceremoved, and
> >>> servicechanged.
> >>>
> >>> [1] http://w3c.github.io/presentation-api/
> >>>
> >>> Best regards,
> >>> Zoltan
> >>
>
>
Received on Friday, 20 March 2015 17:52:53 UTC

This archive was generated by hypermail 2.3.1 : Friday, 20 March 2015 17:52:54 UTC