[Bluez-devel] Re: Re: multi rfcomm/sco connection

[Bluez-devel] Re: Re: multi rfcomm/sco connection

[Suriyan]

> Hi,
>
> > > actually I don"t see why you need more than one SCO link in a
connection
> > > between two devices. However take a look at the kernel source code of
> > > Linux 2.6.x and especially at net/bluetooth/hci_conn.c
> >
> > I explain you a bit more my situation...
> >
> > I need to be able with a single usb-bt-dongle to play/capture audio for
> > several bt-handsfree, I tried with one and there are no problems, but if
I
> > try to connect another one then I get something like "sco channel busy".
> >
> > I studied the net/bluetooth directory but I cannot find any good way to
> > achieve what I need! :)
> >
> > Am I wrong in something or is this feature really missing?
>
> as I said, between two devices BlueZ supports only one ACL link and one
> SCO link. These links a bi-directional so you can play and capture audio
> data at the same time. The limit to one SCO link is only a per ACL link
> limitation. If you open a second ACL to another device you can also have
> a second SCO link bound to that connection.
>
> Regards
>
> Marcel

Hi,

I would like to known feasibility to add multi SCO connections support on
BlueZ stack. I try lastest patched 2.6.9-mh3, I saw sco_num and acl_num were
counted separately, is BlueZ stack going to support multi SCO connections?

I have application to uses Bluetooth Headset work as Wireless Microphone so
that I would like support up to 3 channels for each dongle. Unfotunately,
with lastest BlueZ stack my application can support only one Headset per
dongle.

Anyone have going to add multi SCO connections support on BlueZ stack?
Please let me known, I'd like to hear from you all. Any contact would be
greatly appreciated.

Regards,
Suriyan.




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Re: [Bluez-devel] multi rfcomm/sco connection

[Marcel Holtmann]

Hi Suriyan,

> I would like to known feasibility to add multi SCO connections support on
> BlueZ stack. I try lastest patched 2.6.9-mh3, I saw sco_num and acl_num were
> counted separately, is BlueZ stack going to support multi SCO connections?

this has nothing to do with it.

> I have application to uses Bluetooth Headset work as Wireless Microphone so
> that I would like support up to 3 channels for each dongle. Unfotunately,
> with lastest BlueZ stack my application can support only one Headset per
> dongle.

Please read and understand my responses. We support one SCO per ACL
link. Which means when you open three ACL links, you can also have three
SCO links, but of course there can be only one ACL link between two
Bluetooth devices.

> Anyone have going to add multi SCO connections support on BlueZ stack?
> Please let me known, I'd like to hear from you all. Any contact would be
> greatly appreciated.

As I said, I haven't seen any application that needs to connect more
than one SCO link to an ACL link. Your problem looks like a hardware
limit. Are you using SCO over HCI or over PCM? What kind of Bluetooth
dongle do you use (hciconfig -a)?

Regards

Marcel




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[Bluez-devel] Re: Re: multi rfcomm/sco connection

[Suriyan]

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Hi Marcel,

I just found lastest patch in hci_usb.c that pass alternate setting (isoc) as kernel module parameter but it's still static solution to support more than one SCO connection over single bluetooth adapter. Are you working on dynamically support? I have try to do this a few week ago but I stuck on usb_set_interface() function since I cannot meet it's pre-conditions.

Thanks.

Best Regards,
Suriyan.

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Re: [Bluez-devel] Re: Re: multi rfcomm/sco connection

[Marcel Holtmann]

Hi Suriyan,

> I just found lastest patch in hci_usb.c that pass alternate setting
> (isoc) as kernel module parameter but it's still static solution to
> support more than one SCO connection over single
> bluetooth adapter. Are you working on dynamically support? I have try
> to do this a few week ago but I stuck on usb_set_interface() function
> since I cannot meet it's pre-conditions.

actually I am not working on this, but now you have everything you need
to let hci_usb do the right job.

Regards

Marcel




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Re: [Bluez-devel] Re: Re: multi rfcomm/sco connection

[Lars Grunewaldt]

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Hash: SHA1

Hi,

I looked into this problem back "than", but due to a shortage of time I
never had a chance to really fix this (Marcel stated that the best thing
would be a complete rewrite of hci_usb anyway).

There should be plenty of discussion in the mailing list archive about
how to fix the stuff and how it might be done (main problem was the
interrupt context in the notify function and the not-send urbs (queue
must be empty before setting the new alternate setting...)

would be great if you could fix it, as I don't think I'll have time for
this in the next... months... :(

regards,
~  Lars

Marcel Holtmann wrote:
| Hi Suriyan,
|
|
|>I just found lastest patch in hci_usb.c that pass alternate setting
|>(isoc) as kernel module parameter but it's still static solution to
|>support more than one SCO connection over single
|>bluetooth adapter. Are you working on dynamically support? I have try
|>to do this a few week ago but I stuck on usb_set_interface() function
|>since I cannot meet it's pre-conditions.
|
|
| actually I am not working on this, but now you have everything you need
| to let hci_usb do the right job.
|
| Regards
|
| Marcel
|
|
|
|
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| Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek.
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| Bluez-devel@lists.sourceforge.net
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|

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