Re: Scatternets
Re: Scatternets
- Subject: Re: Scatternets
- From: aSaM <email@hidden>
- Date: Fri, 18 Jul 2008 14:59:38 +0100
And that's why Apple has dumped it in iPhone OSX. Was a British
discovery by Adam Laurie - several years ago...
Asam....
Hi Laurent.
The funny part about Bluetooth Scatternets is that they are hardly specified
and even more, that there are no HCI commands which would tell the BT module
a Scatternet. So you're at the merci of the Bluetooth vendor. Most BT modules
nowadays support Scatternets out-of-the-box. All you have to do is
open connections
in the right order.
Example: Device A opens a connection to B. With default settings, A is now the
master of the Piconet. Now, device C comes along and tries to open a
connection to B.
If the Bluetooth moduel of B supports Scatternets / mutplie
Piconets, B gets to be
slave of C, too.
That's for the baseband connectivity. For the data forwarding, e.g.
from slave 1
to slave 2, you have to come up with something. If you do IP
communication, this
might work outmatically.
Check out our papers on Bluetooth Scatternets for our BTnode
embedded systems at
btnode.ethz.ch
Matthias (PhD Student..:)
On 10.07.2008, at 15:27, Laurent Kirsch wrote:
Hello,
I would like to know whether the Apple Bluetooth modules/stacks support the
creation of scatternets,i.e. Is it possible that one device can be in more
than one piconet simultaneously and serve as a router to route packages from
one piconet to another one ?
Basically what I want to do is write a group communication service. However
because it is impossible to connect to more than 7 devices simultaneously it
would be good if it was possible that one of the 7 devices of this first
piconet could form another piconet and then play the role of a router to get
the packages from one piconet to the other one. In this way it would be
possible to have a bluetooth network with more then 7 devices without having
to park some of them.
If it is not well explained please tell me, I will try to explain it in a
better way.
Any ideas are welcome. Thanks
Kirsch Laurent (student)
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