[Bluez-devel] Bypass for L2CAP packets

[Bluez-devel] Bypass for L2CAP packets

[Matthias Bruné]

Hi Folks,
sorry for a question to the same problem again...
I have a (problem) with the L2CAP layer from BlueZ.
I wrote a program that communicates with a mobile phone by using its own L2CAP 
layer (the program builds its own L2CAP packets for protocol testing).
For example I send a valid "connection request" to that phone and the phone 
answers with a valid "connection response".
So far so good. 
But then the L2CAP layer from BlueZ sends a "command reject", because this 
layer doesn´t know about the "connection request" and cannot handle 
the "connection response".
Ok, i understand that. 
But has anybody an idea how i can communicate with my own L2CAP layer and the 
phone only without using the BlueZ L2CAP layer, because the Bluez layer always 
prevents a further communication?
Hmm... is in this case the L2CAP RAW socket the solution?
I´m stucked with that problem and i hope anybody as an idea.

Many thanks.

Matthias



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Re: [Bluez-devel] Bypass for L2CAP packets

[Xavier Garreau]

> sorry for a question to the same problem again...
> I have a (problem) with the L2CAP layer from BlueZ.
> I wrote a program that communicates with a mobile phone by using its ow=
n L2CAP=20
> layer (the program builds its own L2CAP packets for protocol testing).
> For example I send a valid "connection request" to that phone and the p=
hone=20
> answers with a valid "connection response".
> So far so good.=20
> But then the L2CAP layer from BlueZ sends a "command reject", because t=
his=20
> layer doesn=C2=B4t know about the "connection request" and cannot handl=
e=20
> the "connection response".
> Ok, i understand that.=20
> But has anybody an idea how i can communicate with my own L2CAP layer a=
nd the=20
> phone only without using the BlueZ L2CAP layer, because the Bluez layer=
 always=20
> prevents a further communication?
> Hmm... is in this case the L2CAP RAW socket the solution?
> I=C2=B4m stucked with that problem and i hope anybody as an idea.

You can unload the l2cap module.

BR,
Xavier Garreau
http://www.xgarreau.org/


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Re: [Bluez-devel] Bypass for L2CAP packets

[Marcel Holtmann]

Hi Matthias,

> sorry for a question to the same problem again...
> I have a (problem) with the L2CAP layer from BlueZ.
> I wrote a program that communicates with a mobile phone by using its ow=
n L2CAP=20
> layer (the program builds its own L2CAP packets for protocol testing).
> For example I send a valid "connection request" to that phone and the p=
hone=20
> answers with a valid "connection response".
> So far so good.=20
> But then the L2CAP layer from BlueZ sends a "command reject", because t=
his=20
> layer doesn=B4t know about the "connection request" and cannot handle=20
> the "connection response".
> Ok, i understand that.=20
> But has anybody an idea how i can communicate with my own L2CAP layer a=
nd the=20
> phone only without using the BlueZ L2CAP layer, because the Bluez layer=
 always=20
> prevents a further communication?
> Hmm... is in this case the L2CAP RAW socket the solution?
> I=B4m stucked with that problem and i hope anybody as an idea.

as Xavier mentioned the easiest solution is to unload the L2CAP kernel
module. However I looked at the code and it seems that the the kernel
respond to packets with all idents. It should not do that, because they
are shared between the kernel and the userspace. I think a patch for
that is needed so that for commands from the RAW socket no responses are
send.

Regards

Marcel




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