On 1/8/20 3:25 PM, Pali Rohár wrote:
Somehow this went straight to my Junk folder, so I didn't see this
message at all until now.
> Audio application (e.g. pulseaudio) really do not want to handle two
> separate services to monitor and process HSP/HFP devices. >
> For audio application are HSP and HFP devices equivalent, they provide
> same features: SCO socket, API for controlling microphone and speaker
> gain; plus optionally specify used codec.
> So having two separate services which fully divided for audio
> application purpose does not make sense.
> So it is possible that both HSP and HFP audio cards would be available
> via one audio API? Because I do not see how it could be done via design
> like dundee.
One API sure. Maybe on multiple services. Honestly, I don't see why
this would be such a burden for PA to watch 2 dbus services instead of
1. From oFono perspective it would make more sense to keep the HSP part
a separate daemon. I could be convinced otherwise if it is indeed a big
burden for PA...
>> You can then implement the same API interfaces for setting up the HSP audio
>> stream as oFono does today (i.e. https://git.kernel.org/pub/scm/network/ofono/ofono.git/tree/doc/handsfree...),
> This API is unusable for both HSP and HFP audio streams. In pulseaudio
> it is somehow used, but it is not suitable.
Funny. "It is used but not suitable"?
> Main objection for handsfree-audio-api.txt is that it does not provide
> information about locally used codec and somehow mixes air codec and
> local codec. In my hsphfpd.txt I used term "AgentCodec" for bluetooth
> local codec and term "AirCodec" for bluetooth air codec format.
Okay. But, just FYI, at the time there was no hw that could do such
on-the-fly conversions, so this use case wasn't considered/implemented.
There's really no reason why we couldn't extend our APIs to handle this.
> Another objection against handsfree-audio-api.txt API is that it is
> bound to HF codecs (via number) and does not support for pass e.g. CSR
True. In retrospect we probably should have used strings. But it was
assumed that vendor extensions would go via the Bluetooth SIG Assigned
Numbers facility. Anyhow, we can always add a 'Register2' method that
could take codecs as a string array or a combination of strings & ints.
And if Register2 was used, then use 'NewConnection2' with a signature
that supports passing in vendor codecs and whatever else that might be
> What is completely missing in that API is controlling volume level.
It is there on the CallVolume interface
> And also API does not provide socket MTU information or ability to
> change/specify which codec would be used.
There was no need, we automatically defaulted to using Wide band if
available. Third party codecs are a new use case (for oFono HFP), so
would require an API extension.
> Non-audio APIs which are needed to export (for both HSP and HFP profiles):
> * battery level (0% - 100%)
> * power source (external, battery, unknown)
> * ability to send "our laptop" battery level and power source to remote device
> * send text message to embedded display
> * process button press event (exported via linux kernel uinput)
I think all of these are feasible to support under the current oFono
structure, either via plugins or API extensions.
During start-up, a default Ofono context is set as soon as LTE is attached : defaut public APN is then recorded.
How then context must be handle to change it with another private APN authenticated with user, password ?
I tried to change it dynamically with dbus (AccessPointName, Username, Password) but error message "The resource is currently in use" is returned
Modem Quectel EC25