Re: [Bluez-users] /dev/rfcomm256 ...?

[Marcel Holtmann <marcel@holtmann.org>]

Hi Thomas,

> >>>> rfcomm devices with a number > 255 (e.g. /dev/rfcomm256) in "/etc/
> >>>> bluetooth/rfcomm.conf" seem to be ignored by rfcommd. Is this a  
> >>>> hard
> >>>> limit, or does anyone know a simple way to increase this? We
> >>>> currently have about 400 devices that should go into that file.
> >>>
> >>> yes, that is a hard limit. We only have 256 minor device numbers
> >>> available and that is actually quite a lot. Describe your use case,
> >>> because creating more than 256 TTY seems not like one of the best  
> >>> ways
> >>> to go.
> >>
> >> Thanks. We have 400 robots, numbered from 1 to 400 (with a couple of
> >> gaps) and equipped with a bluetooth chip (serial port profile). We
> >> don't need to communicate with more than 5 at the same time, but
> >> these 5 robots can be picked at random from the 400. Hence, we need
> >> to be able to establish a connection to all of them at any time.
> >>
> >> Up to now, we only used the first 200 and put all them in /etc/
> >> bluetooth/rfcomm.conf with "bind yes". This worked reasonably well
> >> (apart from the problems with concurrent access that I mentioned in
> >> another post). Is there a more elegant way?
> >
> > rewrite your application to use the RFCOMM socket directly. In this  
> > case
> > you don't have this limit at all.
> 
> Do you have a pointer to some documentation/tutorial?

some years ago, I wrote a detailed email how easy it is to convert a TTY
based application into a RFCOMM socket based application. Besides this
email there exists no further documentation. However you might wanna
take a look at the attest.c source code for an example.

Regards

Marcel




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