Re: [Bluez-devel] Piconet Routing

[Marcel Holtmann <marcel@holtmann.org>]

Hi Stefan,

> > > Since Bluetooth uses Time Division Duplex, a slave is not allowed to 
> > > talk to another slave in the same Piconet. The logical consequence must 
> > > be that the data is routed over the master. I've used l2test to check if 
> > > l2cap does this kind of routing automatically. It doesn't but rather 
> > > creates a new, direct acl link to the remote slave device (scatternet). 
> > > I don't know how it is with rfcomm, but I suppose it's the same. My 
> > > question: Is there any automatic Piconet Routing inside BlueZ or does 
> > > one have to implement it by oneself?
> > >     
> > you must do it by yourself, because even if the master manages to put
> > all devices into the same piconet the connections are point to point.
> > 
> >   
> TCP connections are also point to point, but since it's built on top
> of IP, it goes (transparently) over many routers. Before I tested it,
> I thought the link manager would take care of this. How does the
> communiction of many BT devices work in practice? Who manages this
> routing, since one device can only be point-to-point-connected to 2
> devices (an this doesn't work really smooth)? There must be one
> controlling instance. One cannot let the different applications handle
> this, can one?

this is true, but the problem is, that a slave does not know to which
other slaves a master is connected. There is no routing stuff like in IP
and you can't retrieve these information from the HCI layer.

Regards

Marcel




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