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From:   Emil Lenngren <emil.lenngren@gmail.com>
Date:   Thu, 12 Nov 2020 14:53:05 +0100
Message-ID: <CAO1O6se6UF9Ao516xudciGBYtA9j=i-PMEbrsAhjga10ujxacg@mail.gmail.com>
Subject: Re: LE Advertising: Command Disallowed
To:     Devin Bayer <dev@doubly.so>
Cc:     Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
        "Michael N. Moran" <mike@mnmoran.org>,
        "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
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Hi Devin,

Den tors 12 nov. 2020 kl 13:16 skrev Devin Bayer <dev@doubly.so>:
>
> On Wed, Nov 11, 2020 at 11:00:32PM +0000, Emil Lenngren wrote:
> >
> > It would be good to see the complete log from when the "Reset" command
> > is issued, otherwise we don't know in which "state" the controller is
> > in at the various commands. Also widen the command window when running
> > btmon so we see the complete names. :)
> > Seeing the result from "LE Read Supported States" would also be nice.
> >
>
> Hi Emil,
>
> below is the complete log, starting with the the reset command. It
> includes the "Supported States" call too. Let me know if there is
> anything else I can do.
>
> ~ Devin
>

It's as Luiz said, you're mixing two different stacks and hence mixing
legacy advertising commands with extended ones. The HCI standard says:

"If, since the last power-on or reset, the Host has ever issued a legacy
advertising command and then issues an extended advertising command, or
has ever issued an extended advertising command and then issues a legacy
advertising command, the Controller shall return the error code Command
Disallowed (0x0C)."

After Reset, you can see "LE Set Extended Advertising Parameters"
during the `hciconfig` runs. Then later, when `python` runs, a "LE Set
Advertise Enable" is sent. This is disallowed behaviour.

One solution is that your python program sends a "Reset" command as
the first thing, otherwise you don't know which state the controller
is in. The other solution is to use BlueZ only.

/Emil