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From:   Neacsu Cristian <neacsu.cristianstefan@gmail.com>
Date:   Fri, 17 Feb 2023 20:08:38 +0200
Message-ID: <CADBWZmUBKdVf9M3G5s6KW-4spXidQxiE0KRwytsdS+xrvk0t-Q@mail.gmail.com>
Subject: Re: Need a BLE socket to connect to a nRF52832 Nordic (Low energy BT 5)
To:     Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Cc:     linux-bluetooth@vger.kernel.org
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Hello,

Thank you for your reply. Yes gatt is the way to go. I tried in
bluetoothctl using gatt.list_attributes gatt.select_attribute,
selecting the tx uuid and the send some bytes. Exactly what I need.
But that is directly in bluetootctl. I don't want to do that by doing
a wrapper around it. How can I implement it directly in C?
Do you have a scenario for a gatt connection in C?

Cristian-Stefan


Cristian-Stefan


On Thu, Feb 16, 2023 at 11:04 PM Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
>
> Hi Neacsu,
>
> On Thu, Feb 16, 2023 at 11:20 AM Neacsu Cristian
> <neacsu.cristianstefan@gmail.com> wrote:
> >
> > Hello,
> >
> >     Long story short, I am trying to connect with a linux PC using a
> > Bluetooth 5 universal adapter (Asus USB-BT500) to a Bluetooth 5 module
> > PCB, called BT832X which is using a Bluetooth Low Energy Technology
> > that is using a chip Nordic nRF52832 (see url for the module
> > documentation https://static1.squarespace.com/static/561459a2e4b0b39f5cefa12e/t/63de8b578e4d7813cde64445/1675529048975/BT832X-p+Product+Specifications.pdf).
> >     Therefore I tried everything, reading docs, sniffing through the
> > bluetoothctl sources, gatttools sources, and I am not able to open and
> > connect on a socket on my PC to connect properly.
> > Usually for legacy Bluetooth stuff, I create a RF_COMM socket, and the
> > magic is done by itself. No biggie.
> >     Here I tried an L2CAP approach (not sure if I had a proper
> > configuration), I tried to use the gatttool as it is, without success.
> > I feel a bit lost.
> >     The remote device is working properly, because using the Nordic
> > demo Android app (downloadable from Google Play Store), I am able to
> > communicate with the PCB and exchange packages.
> >     Do you have a functional, very simple sample, or suggestion,
> > preferably in C, to help me to open a socket and send a data package?
> > I mean, you have a BLE module, you want to connect with it using
> > BlueZ, how do you open a socket, how do you configure it, connect to
> > it and send a byte through it?
> >     Let's keep in mind that I am already able to scan for the
> > destination address (I created a custom agent in bluetoothctl that is
> > fishing data using the "scan on" command), so the address that I'm
> > connecting to is already known.
> >
> > Thank you and I'm really really looking forward to your reply.
>
> I guess for LE what you really want is to use GATT procedures, which
> are available via bluetoothctl> menu gatt
>
> > Cristian-Stefan
>
>
>
> --
> Luiz Augusto von Dentz