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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Thu, 17 Nov 2022 13:56:37 -0800
Message-ID: <CABBYNZKF=XUuq1_G_h-ZA8DMTtZiV4VQr-9_jUDjw2Da5sZ9gA@mail.gmail.com>
Subject: Re: Connecting to a BR/EDR+BLE device a via dbus?
To:     Simon Vogl <simon@voxel.at>
Cc:     linux-bluetooth@vger.kernel.org
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Hi Simon,

On Thu, Nov 17, 2022 at 8:20 AM Simon Vogl <simon@voxel.at> wrote:
>
> Dear all,
>
> we are communicating with a headset-ish device that offers classic
> bluetooth services and BLE characteristics in parallel.
>
> We have code to talk to the Bluetooth classic part via bluetoothd/dbus,
> and we have code for talking to the BLE parts based on the C-library /
> gatt-client code ; both run in parallel for some time but not
> super-stable, so I'd like to move the code over to a dbus version.
>
> As the device starts advertising BLE characteristics only after a
> classic connection has been established, it appears as a Bluetooth
> classic device on the system bus, and I did not find a way to start GATT
> discovery via the 'official' dbus-API.
>
> I don't fear to tweak bluetoothd nor ~ctl, but would like to know if
> someone already some development going in that direction?

Perhaps what is needed is to connect ATT over BREDR that way you don't
need 2 bearers to be connected, bt_att already supports connecting
over classic but we never took the step to connect ATT once we figured
it supported the ATT PSM given is not very common to have a classic
profile that uses GATT attributes.

> Simon
>
> --
>
> VoXel Interaction Design  |www.voxel.at
> DI Dr.techn. Simon Vogl   |simon@voxel.at
> Tomaschekweg 46           |  +43 650 2323 555
> A-4040 Linz - Austria     |
> Office address: Industriezeile 35, 4020 Linz (2nd floor)
>


-- 
Luiz Augusto von Dentz