[pulseaudio-discuss] [PATCH 2/3] bluetooth: use native and ofono backends in parallel with headset=auto

[Georg Chini]

On 10.03.2017 08:13, Georg Chini wrote:
> On 10.03.2017 00:33, Tanu Kaskinen wrote:
>> On Thu, 2017-03-02 at 17:04 +0100, Georg Chini wrote:
>>> This patch changes the behavior of the headset=auto switch for 
>>> module-bluez5-discover.
>>> With headset=auto now both backends will be active at the same time 
>>> for the AG role and
>>> the switching between the backends is only done for the HS role.
>>> headset=ofono and headset=native remain unchanged.
>>>
>>> This allows to use old HSP only headsets while running ofono and to 
>>> have headset support
>>> via pulseaudio if ofono is started with the --noplugin=hfp_ag_bluez5 
>>> option.
>> Not really related to the patch, I'm just curious: Does hfp_ag_bluez5
>> make ofono act in the AG role?
>
> Yes, it does. However this only works if you have a modem in your system
> or simulate one with phonesim. When I tested it (at least a year ago), 
> ofono
> would support the AT commands of the headset, but audio did not work.
> This is why I switched the AG support off.
>
>> Is the plugin loaded by default?
>
> Yes.
>
>> Does
>> that work nowadays? Or is it still work in progress?
>
> I'll pull a fresh ofono tree later today and check. The version on my 
> system
> is rather old.
It still does not work in multiple ways. More detail:

- You need an enabled modem in your system before ofono exposes the
    HFP AG role. This means you must at least have phonesim installed and
    running and then use some D-Bus command to power on the simulated
    modem.
- When the headset connects to ofono, you cannot switch the profile to HFP
    using pulesaudio (it says "not connected", although the headset is 
connected
    to ofono)
- When I simulate a call with phonesim and ofono tries to pass the audio
    connection to pulse, pulse crashes with an assertion:

  module-bluez5-device.c: Assertion 'cp = 
pa_hashmap_get(u->card->profiles, 
pa_bluetooth_profile_to_string(t->profile))' failed at 
modules/bluetooth/module-bluez5-device.c:2068, function 
handle_transport_state_change(). Aborting.

I'm investigating why that happens.

So all in all I would say that the ofono AG role support is completely 
broken
and I can only recommend to run ofono with the --noplugin=hfp_ag_bluez5
to disable it.