Re: d-bus or management api for beacon stuff

[Don Zickus <dzickus@redhat.com>]

On Tue, Nov 29, 2016 at 11:56:03AM -0800, Brennan Ashton wrote:
> > > SetDiscoveryFilter might also be necessary/helpful.
> > 
> > Yep, the SetDiscoveryFilter might be the way to go, the only missing
> > part that it doesn't do right now is to disable duplicate filtering,
> > but we might need some flag with a big warning that this will spam
> > the
> > bus like crazy or perhaps it can only be used along RSSI filtering,
> > which is to prevent people to use advertisement/scanning APIs as a
> > transport over D-Bus.
> > 
> > We could offer a file descriptor based solution for transport
> > emulation using scanning/advertising to prevent spamming D-Bus but
> > that has to play nicely with other application, either that or we
> > only
> > allow this over MGMT interface which is what we suggest in case there
> > is no other use for Bluetooth in the system.
> > 
> > And btw, I wouldn't account Android and other mobile OSes allowing
> > such raw access for much longer, it takes way too much power and can
> > probably block any other Bluetooth peripheral to work, so it is
> > probably only good to write packet sniffer and other debug tools on
> > top of the system but it really offer nothing to the regular user.
> 
> I have had to resort to using the HCI interface to work with scanning
> and advertising beacon packets.  I had mentioned in an earlier thread
> the issue with duplicates.  Not only do you end up with a lot of spam
> on the dbus interface you end up with an ever increasing number of
> bluetooth devices.  The Bluetooth mesh uses this transport, so I really
> would like to see a nice interface to support rx/tx of these packets.

Hi,

Sorry for being ignorant (as I can't quite find the filter duplicate code
other than the setting of the bit), but would throttling work here?  Cap the
duplicates at say every 100ms or 10x/second.  That probably won't help with
power consumption (unless start/stop of the radio is quick?).

Just trying to help move this along..  willing to code/test.

Cheers,
Don