Re: Bose Quiet Comfort 35 Remaining Battery Reporting

Hi Hugues,

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Thanks for the reply, I know the bose android application do report the
battery power of the headset, but I don't know if it is done in a
propitiatory manner. How could I check that ?

It is probably the 00000000-deca-fade-deca-deafdecacaff service, Ive
also seem some bose devices that are dual-mode so they have a GATT
service over LE that might expose these details.

or it uses the Apple HFP extensions they defined to get battery status. Also 00000000-deca-fade-deca-deafdecacaff should be the wireless version of Apple’ iAP (iPod Accessory Protocol).

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). 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

Regards

Marcel