[Bluez-users] UDP and TCP packets across Bluez connections?

[Bluez-users] UDP and TCP packets across Bluez connections?

[rparker]

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I have an emebdded Linux app that currently listens on a socket that 
receives messages from multiple interfaces (e.g. ethernet, USB with RNDIS, 
wireless). I want to add Bluetooth support.

My question: Do Bluez interfaces to Bluetooth devices act like any other 
IP interface?

I found example source code on the internet of sockets being opened with 
AF_BLUETOOTH as the socket domain (i.e. the first argument to the socket 
call). Does one have to always do it that way in order to receive inbound 
messages on a Bluetooth interface?

I came across text that makes it sound like one uses L2CAP in place of UDP 
and RFCOMM in place of TCP.
http://people.csail.mit.edu/albert/bluez-intro/x95.html 

http://bluez.sourceforge.net/contrib/HOWTO-PAN

So then is it not possible to do TCP/IP across Bluetooth connections? Does 
one need to write application level code that is different for Bluetooth 
as compared to ethernet/USB/wireless?

Also, if one can do TCP/IP over Bluetooth from Linux then does Windows 
recognize incoming TCP and UDP packets without loading a special driver on 
Windows? Currently with USB one uses RNDIS on Windows and an RNDIS 
equivalent driver configuration on Linux. Then Windows and Linux can talk. 
But to do TCP/IP between Linux and Windows over Bluetooth what does one 
do?

Or if there is not real TCP/IP support with Bluetooth does Windows 
understand RFCOMM and L2CAP?

Also, is there some sort of authoritative write-up on a web page somewhere 
about TCP/IP on Bluetooth? I've Googled up read probably 100 web pages 
looking for better info and haven't found it.

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Re: [Bluez-users] UDP and TCP packets across Bluez connections?

[Marcel Holtmann]

Hi,

> I have an emebdded Linux app that currently listens on a socket that
> receives messages from multiple interfaces (e.g. ethernet, USB with
> RNDIS, wireless). I want to add Bluetooth support. 
> 
> My question: Do Bluez interfaces to Bluetooth devices act like any
> other IP interface? 
> 
> I found example source code on the internet of sockets being opened
> with AF_BLUETOOTH as the socket domain (i.e. the first argument to the
> socket call). Does one have to always do it that way in order to
> receive inbound messages on a Bluetooth interface? 
> 
> I came across text that makes it sound like one uses L2CAP in place of
> UDP and RFCOMM in place of TCP. 
> http://people.csail.mit.edu/albert/bluez-intro/x95.html 
> 
> http://bluez.sourceforge.net/contrib/HOWTO-PAN 
> 
> So then is it not possible to do TCP/IP across Bluetooth connections?
> Does one need to write application level code that is different for
> Bluetooth as compared to ethernet/USB/wireless? 

so first of all. The socket interface doesn't mean IP. It is a generic
way of using network protocols. And network protocols doesn't mean IP
only. There are more network protocols than you can think of.

> Also, if one can do TCP/IP over Bluetooth from Linux then does Windows
> recognize incoming TCP and UDP packets without loading a special
> driver on Windows? Currently with USB one uses RNDIS on Windows and an
> RNDIS equivalent driver configuration on Linux. Then Windows and Linux
> can talk. But to do TCP/IP between Linux and Windows over Bluetooth
> what does one do? 
> 
> Or if there is not real TCP/IP support with Bluetooth does Windows
> understand RFCOMM and L2CAP? 

If you wanna have TCP then you can do Ethernet over Bluetooth which is
done by PAN over BNEP. And that would interact with Windows or any other
OS for that matter.

> Also, is there some sort of authoritative write-up on a web page
> somewhere about TCP/IP on Bluetooth? I've Googled up read probably 100
> web pages looking for better info and haven't found it.

The first thing that you should read is a Bluetooth introduction that
explains the various protocol layers that can be used for various tasks.

Regards

Marcel



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Re: [Bluez-users] UDP and TCP packets across Bluez connections?

[Timothy Murphy]

Marcel Holtmann wrote:

> The first thing that you should read is a Bluetooth introduction that
> explains the various protocol layers that can be used for various tasks.

Is there such a document online?



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Re: [Bluez-users] UDP and TCP packets across Bluez connections?

[Marcel Holtmann]

Hi Timothy,

> > The first thing that you should read is a Bluetooth introduction that
> > explains the various protocol layers that can be used for various tasks.
> 
> Is there such a document online?

it is called the Bluetooth core specification and their additional
profile specifications.

Regards

Marcel



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Re: [Bluez-users] UDP and TCP packets across Bluez connections?

[rparker]

Marcel Holtmann <marcel@holtmann.org> 
Sent by: bluez-users-bounces@lists.sourceforge.net
09/22/2007 12:46 AM
Please respond to
BlueZ users <bluez-users@lists.sourceforge.net>


To
BlueZ users <bluez-users@lists.sourceforge.net>
cc

Subject
Re: [Bluez-users] UDP and TCP packets across Bluez connections?






Hi,


> Or if there is not real TCP/IP support with Bluetooth does Windows
> understand RFCOMM and L2CAP? 

If you wanna have TCP then you can do Ethernet over Bluetooth which is
done by PAN over BNEP. And that would interact with Windows or any other
OS for that matter.

Do you happen to know whether I need to install a special driver on 
Windows so that Windows will recognize ethernet packets that come via 
Bluetooth? Or will it just automagically work?




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