Re: [Bluez-devel] Master / Slave question

[Marcel Holtmann <marcel@holtmann.org>]

Hi Olivier,

> I am trying to make 2 mobile phones connected concurrently
> to a RFCOMM server. Please note that they don't support
> role switching, so as they initiate the communication, they
> are always "master".
>  
> My RFCOMM server is a forking one so it can virtually
> deal with concurrent clients like on TCP.
>  
> I have put lm=accept in hcid.conf
>  
> If I open a RFCOMM server on channel 14 and try to make
> the 2 mobile connect to channel 14, the first is ok, the
> second can't connect. I suppose that's normal, because
> channel 14 "slave" is busy linux-side with the first
> connection and a "slave" can deal with one connection only.
>  
> Then I've launched a second server on channel 15 (server
> on channel 14 running concurrently), and i try to make
> the first mobile connect to channel 14 and the second
> to channel 15 : it's the same, only the first can connect.
>  
> I think I have a misunderstanding here, as i thought the
> "master/slave" was per channel. Does it mean the "slave" status 
> is for the whole adaptor, and once a "slave" connection is
> open on one channel, it can't receive other connections at all ?

the master/slave thing is per ACL connection. However there can only be
one ACL connection between two devices. Run "hcidump -X -V" and see
what's the actual error message on the HCI level.

Regards

Marcel




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