[Bluez-devel] Can i get address of device who is doing discovery?

[Bluez-devel] Can i get address of device who is doing discovery?

[Rupesh Gujare]

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Dear all,
  I want to get address of a device who is doing discovery. (while my local
device is responding to discovey) I know that while doing discovery a device
sends a FHS packet which contains its address and clock information.
  But i dont know how to hack code to extract its BD Adress.
  Your help is greatly appreciated
 Thanks and regards
 Rupesh

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Re: [Bluez-devel] Can i get address of device who is doing discovery?

[Marcel Holtmann]

Hi Rupesh,

>   I want to get address of a device who is doing discovery. (while my
> local device is responding to discovey) I know that while doing
> discovery a device sends a FHS packet which contains its address and
> clock information. 
>   But i dont know how to hack code to extract its BD Adress.

it is impossible to do that with the HCI interface.

Regards

Marcel



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Re: [Bluez-devel] Can i get address of device who is doing discovery?

[Rupesh Gujare]

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Is there any other way of doing this task?
                 Actually I want to generate some event from mobile device
which will give me its address. So that i can start communication with it.
(without having any software on mobile side).

Regards
 Rupesh

On 5/15/07, Marcel Holtmann <marcel@holtmann.org> wrote:
>
> Hi Rupesh,
>
> >   I want to get address of a device who is doing discovery. (while my
> > local device is responding to discovey) I know that while doing
> > discovery a device sends a FHS packet which contains its address and
> > clock information.
> >   But i dont know how to hack code to extract its BD Adress.
>
> it is impossible to do that with the HCI interface.
>
> Regards
>
> Marcel
>
>
>
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> Download DB2 Express C - the FREE version of DB2 express and take
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Re: [Bluez-devel] Can i get address of device who is doing discovery?

[Marcel Holtmann]

Hi Rupesh,

> Is there any other way of doing this task? 
>                  Actually I want to generate some event from mobile
> device which will give me its address. So that i can start
> communication with it. (without having any software on mobile side). 

ask the manufacturer of your Bluetooth chip.

Regards

Marcel



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Re: [Bluez-devel] Can i get address of device who is doing discovery?

[Steven Singer]

Marcel Holtmann wrote:
> ask the manufacturer of your Bluetooth chip.

If the question is "Can a device in inquiry scan determine the Bluetooth
address of the device performing the inquiry?" then the answer is no.

At the protocol level, the FHS packet goes from the device that's
in inquiry scan (that is, the device that is discoverable) to the device
that's inquiring (that is, the device performing discovery).

The only packet that goes from the inquiring device to the scanning
device is an ID packet using an inquiry access code. This contains no
information about the inquirer.

If the inquirer were to follow up with a remote name request then it
would send its address to the scanning device. This address is not
reported over the HCI interface although, in theory, a modified
controller could report it.

If the inquirer follows up with an SDP lookup then that makes a full
connection up to the host so the scanning device is aware of the
address of the device making the connection.

Rupesh Gujare wrote:
>                  Actually I want to generate some event from mobile device
> which will give me its address. So that i can start communication with it.
> (without having any software on mobile side).

Typically, the way you do this is to make the phone discoverable
through the usual user interface options. Then your device performs
the discovery and can find out the address of the phone.

	- Steven
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