Re: [Bluez-devel] Multiple headsets with one dongle

[Brad Midgley <bmidgley@xmission.com>]

Michael

> number, but what I haven't been able to get working is one headset
> calling the other. Well, actually, it *does* work, but the audio is
> totally unusable.
> 
> From what I have been able to gather so far, the headsets are using
> RFCOMM channel 2 (sdptool search --bdaddr 0x111E), and so when both are
> communicating with the dongle at the same time, they most likely are
> interfering each other. My questions are:

The rfcomm channel communication is not where interference happens. It's
when both headsets try to build the sco connection at the same time.

> 3. The dongle, configured as master, *should* support up to three slaves
> using the handsfree profile?

I'm not totally sure how to do this anyway. Marcel has hinted at it and
apparently there's a boot-time parameter to set something to allow two
sco connections. I tried to capture everything in the btsco bug for
multiple headsets, but this is all I come up with there:

Marcel adds: "To get more than one SCO channel working the hci_usb
driver must be fixed to dynamicaly change the alternate settting."

I think he was working on the generic case but if you know how many
headsets you have paired with you could set the alternate setting once
and leave it alone I think.

Brad


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