Re: Bose Quiet Comfort 35 Remaining Battery Reporting

[Sebastian Reichel <sre@kernel.org>]

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Hi Hugues,

I agree, that this should be handled in bluez instead of pulseaudio.
I only implemented the proof of concept in pulseaudio, since it was
not easily possible in bluez and easy to do in pulseaudio. I think
some restructuring of bluez/pulseaudio rfcomm handling is required,
but I don't plan to take care of this.

-- Sebastian

On Sun, Feb 11, 2018 at 02:22:46PM +0100, Hugues wrote:
> Hello,
> Sebastian code works great!
> But how can I proceed so the remaining battery is exposed over upower?
> 
> 	Greping through pulseaudio sources
> (git://anongit.freedesktop.org/pulseaudio/pulseaudio) for 'battery'
> doesn't return anything, so anything about battery power seems unlikely
> to be merged into pulseaudio.
> 
> 	upower already expose batteries from bluez through dbus
> (git://anongit.freedesktop.org/upower:src/linux/up-device-bluez.c)
> 
> So is it possible to do the AT commands at the bluez level and expose
> the infos through dbus, so upower expose it to the rest of the system?
> 
> Thanks,
> Hugues
> 
> On 02/24/2017 12:01 PM, Hugues wrote:
> > Hello,
> > Thanks a lot!
> > I tried to connect to the headset through dbus to make the AT commands,
> > but failed.
> > So what's the services/program where this should be implemented so it
> > can be exposed on dbus and picked up by the Desktop Environment?
> > 
> > Regards,
> > Hugues
> > 
> > On 02/13/2017 06:55 AM, Sebastian Reichel wrote:
> >> Hi,
> >>
> >> FWIW I was also interested in battery level of my Bose QC35 and
> >> checked this some time ago. That time I only checked the low
> >> energy stuff, since the Android application seems to know the
> >> battery status with only LE being connected.
> >>
> >> Marcel Holtman wrote:
> >>>> This headset do have dual mode, I searched around using gatttool ant the
> >>>> gatt specification but I find nothing about Battery Level
> >>>> (org.bluetooth.characteristic.battery_level.xml) or Battery Service
> >>>> (org.bluetooth.service.battery_service.xml).
> >>
> >> Bose QC35 does not expose battery status through standard battery_level
> >> characteristic. There is a proprietary primary service 0xfebe (which
> >> is assigned to Bose) with a couple of custom services. I assume battery
> >> level can be read through them, but the required commands are unknown.
> >>
> >>>> How could I read what's in the Apple HFP extensions?
> >>>
> >>> Start with this one. It describes the extra HFP AT commands that iOS uses:
> >>>
> >>> https://developer.apple.com/hardwaredrivers/BluetoothDesignGuidelines.pdf
> >>
> >> Thanks for the documentation link! That is actually implemented for
> >> the Bose QC35. Here is a quick hack providing battery status info
> >> in pulseaudio log:
> >>
> >> https://github.com/sre/pulseaudio/commit/d66b66d20e9bc73e6d0ca89283cf2b5675304b00
> >>
> >> -- Sebastian
> >>
> > 
> 

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