_______________________________________________
Bluez-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/bluez-devel
Hi Horacio,
> Attached you'll find the code for a test program that makes a call using
> the hands-free profile connected to a cell phone and when the call is
> answered it generates echo (so the person who answers the phone will
> hear himself)
>
> Running just one instance of it with just one phone, it works great.
> When I try to run two instances, each connected to a different phone, it
> works for a few seconds and then all the SCO data stops flowing (hcidump
> shows nothing) The bluetooth dongle I'm using has a led indicating it's
> working. That led gets off permanently and the phones display an
> indication saying something like "bluebooth connection lost"
>
> After that, trying to do an hcitool scan dies with:
>
> Scanning ...
> Inquiry failed: Connection timed out
>
> On http://www.compendium.net.ar/2sco.hcidump.bz2 you can find an hcidump
> of the tests.
>
> The dongle i'm using is:
>
> Bus 001 Device 004: ID 4851:1103
>
> horape@nb:~$ hciconfig hci0 version
> hci0: Type: USB
> BD Address: 00:0E:A1:00:54:19 ACL MTU: 192:8 SCO MTU: 64:8
> HCI Ver: 1.1 (0x1) HCI Rev: 0x32e LMP Ver: 1.1 (0x1) LMP Subver: 0x32e
> Manufacturer: Cambridge Silicon Radio (10)
> horape@nb:~$ hciconfig hci0 revision
> hci0: Type: USB
> BD Address: 00:0E:A1:00:54:19 ACL MTU: 192:8 SCO MTU: 64:8
> Build 814
> horape@nb:~$ hciconfig hci0 features
> hci0: Type: USB
> BD Address: 00:0E:A1:00:54:19 ACL MTU: 192:8 SCO MTU: 64:8
> Features: 0xff 0xff 0x0f 0x00 0x00 0x00 0x00 0x00
> <3-slot packets> <5-slot packets> <encryption> <slot offset>
> <timing accuracy> <role switch> <hold mode> <sniff mode>
> <park state> <RSSI> <channel quality> <SCO link> <HV2 packets>
> <HV3 packets> <u-law log> <A-law log> <CVSD> <paging scheme>
> <power control> <transparent SCO>
>
> Kernel is:
>
> Linux nb 2.6.17 #4 SMP PREEMPT Wed May 10 13:53:45 CEST 2006 i686 GNU/Linux
>
> Default with KNOPPIX 5.0.1 2006-06-01
>
> I'm working on a toshiba satellite P105-S6024.
>
> The phones i'm using are sony ericsson z520a. The code assumes rfcomm channel 3 is
> hands free profile (line 50) and call indicator 10 is callsetup (line 67)
>
> Is somebody able to help? Is there more info I could provide to help in the search
> for a solution?
>
> I'm looking forward to have 7 phones connected to a PC, making calls all
> at once almost 24/7. Should I try with 7 dongles, one for each phone?
> Would that work better?
it is an idea to go with 7 phones, because the maximum number of SCO
channels per piconet is 3. There is simply no more bandwidth available.
That said, 2 SCO channels should work, but I assume our USB driver or
maybe the old CSR firmware can't really handle that smoothly.
Regards
Marcel
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Bluez-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/bluez-devel
Horacio
fyi... over a year ago, Marcel wrote this cryptic note on multiple sco
connections:
===========
starting with 2.6.10 the hci_usb got a module parameter "isoc". This
controls the alternate setting when plugging in a dongle. The default
value is 2 (or 0 if it is blacklisted device). Check the Bluetooth
specification what value you have to choose for 2 x 16-bit SCO channels.
===========
If you're not able to find that value, you could try experimenting with
different values.
I was not able to find out what happens if the value is set higher than
you really need it. Would it hurt to load hci_usb with isoc set to the
value for two headsets even if you usually only use one? I don't know.
> Running just one instance of it with just one phone, it works great.
> When I try to run two instances, each connected to a different phone, it
> works for a few seconds and then all the SCO data stops flowing
Brad
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Bluez-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/bluez-devel
Horacio
> Attached you'll find the code for a test program that makes a call using
> the hands-free profile connected to a cell phone and when the call is
> answered it generates echo (so the person who answers the phone will
> hear himself)
I talked with Marcel about this. Here's the current situation:
uart-connected bluetooth adapters can do multiple sco connections
without any trouble.
usb-connected bluetooth adapters suffer from a limitation in the usb
kernel layer... the number of sco connections has to be hardcoded at
boot time in the isoc parameter. If it's set for two 16-bit sco
connections, when more or fewer connections are in use, no audio gets
through. The usb layer needs a rewrite to fix this.
Brad
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
Bluez-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/bluez-devel