Re: Scatternets
Re: Scatternets
- Subject: Re: Scatternets
- From: Matthias Ringwald <email@hidden>
- Date: Fri, 18 Jul 2008 10:51:31 +0200
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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| References: | |
| | >Scatternets (From: Laurent Kirsch <email@hidden>) |