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Subject: Re: Help with LE Create Connection
From: Marcel Holtmann <marcel@holtmann.org>
In-Reply-To: <CAGuV3hM+GPfDQf5C6-Ug8R+QPe-xo361TgVTem2HjWjnZ0To2Q@mail.gmail.com>
Date: Mon, 23 Apr 2018 19:02:25 +0200
Cc: linux-bluetooth@vger.kernel.org
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 <CAGuV3hM+GPfDQf5C6-Ug8R+QPe-xo361TgVTem2HjWjnZ0To2Q@mail.gmail.com>
To: Fulko Hew <fulko.hew@gmail.com>
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Hi Fulko,

> I'm doing my first Bluetooth app, and I have a specific question and a
> general question:
> 
> 1/ Where can I find documentation on the BlueZ API?
>   I've searched and haven't found anything yet.
> 
> 2/ I've captured a trace of an existing conversation off of my Android phone,
>   and I'm trying to re-create it via my own app using BlueZ.
>   I've gotten to the point of trying to do an LE Create Connection
> via hci_le_create_conn()
>   and my first stumbling block is the value of the 'peer address type'.
>   From my investigation, I need to use the 'public' address type
> which according to
>   the spec, and Wireshark is a value of 0x00, but bluetooth.h defines
> 'public' as 0x01
>   (as per the following extract).  Can anyone explain it to me?
> 
>   #define BDADDR_BREDR           0x00
>   #define BDADDR_LE_PUBLIC       0x01
>   #define BDADDR_LE_RANDOM       0x02

why not use the bluetoothd D-Bus GATT APIs for your application. It will create all needed connections. Manually doing HCI is the wrong approach since that is owned by the kernel.

Regards

Marcel