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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Mon, 24 Feb 2020 16:32:58 -0800
Message-ID: <CABBYNZJn3-xBUQ8h_akoKAzm4AT1COjAFLhMhg6V=VnjOZVTvQ@mail.gmail.com>
Subject: Re: Bluez blotoothctl scan vs hcitool scan
To:     chris baker <chrisbkr2020@gmail.com>
Cc:     Barry Byford <31baz66@gmail.com>,
        Bluez mailing list <linux-bluetooth@vger.kernel.org>
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Hi Chris,

On Mon, Feb 24, 2020 at 1:56 PM chris baker <chrisbkr2020@gmail.com> wrote:
>
> On Mon, Feb 24, 2020 at 9:13 AM Barry Byford <31baz66@gmail.com> wrote:
> >
> > If the DBus API is not cutting it for you then using the MGMT API
> > https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc/mgmt-api.txt
> > is what has been recommended in the past:
> > https://www.spinics.net/lists/linux-bluetooth/msg68959.html
> >
> > On Mon, 24 Feb 2020 at 16:37, chris baker <chrisbkr2020@gmail.com> wrote:
> > >
> > > On Mon, Feb 24, 2020 at 6:08 AM Barry Byford <31baz66@gmail.com> wrote:
> > > >
> > > > Hi Chris,
> > > >
> > > > On Mon, 24 Feb 2020 at 10:12, chris baker <chrisbkr2020@gmail.com> wrote:
> > > > >
> > > >
> > > > > So my question is, is there a way to get those missing advertisements
> > > > > through the dbus api, possibly some additional setting somewhere?
> > > >
> > > > Duplicates are disabled by default with the DBus API. This can be
> > > > controlled with the DuplicateData setting:
> > > > https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc/adapter-api.txt#n107
> > > >
> > > > Regards,
> > > > Barry
> > >
> > >
> > > My apologies, I guess I wasn't clear (long post) but, I turned
> > > duplicate data on when using the bluetoothctl command (via the "scan"
> > > submenu) and also used the flag, "hcitool lescan --duplicates", when
> > > running the hcitool command. So both scans should have included any
> > > duplicates (unless I've misunderstood something). Additionally, none
> > > of the missing packets were duplicates (again, unless I'm
> > > misunderstanding what "duplicates" means). each packet had a unique
> > > sequence numbers as well as the button data field toggling.
>
> Great, thank you. I'll look into the MGMT api in the coming days. That
> said, is it a problem to use both api's (MGMT/DBus) concurrently from
> the same app? My application supports both connected BLE sensors as
> well as BLE beacon type sensors. If possible I can handle them in two
> different threads, but the DBus thread for connected sensors would
> still occasionally need to scan for new sensors (using the DBus
> discovery call) and would still need to get characteristic changed
> callbacks as well.

Have a look at the other thread subject: Adding support for
DuplicateData into the kernel

We are discussing adding support to disable duplicate via MGMT since
DuplicateData does not currently remove it but we might want to change
that, or at least have some alternative API to do that. We could for
example have a socket that enables a more direct access to the
advertisments, that way protocol that work over advertisement would
have a way to do this, in fact this might be better for things like
mesh so it can coexist with bluetoothd.

> Out of curiosity though, is the behavior I'm seeing normal? Or is the
> sensor doing something improper possibly? Seeing as the packets aren't
> duplicates why would they be filtered (or are they just not being
> received to begin with for some reason)? The 11 second interval seems
> kind of strange. Anyway, thanks again for the help! Chris


--
Luiz Augusto von Dentz