Re: Losing SCO connection
Michael Oh <[email protected]>
| Newsgroups | gmane.linux.bluez.user |
|---|---|
| Message-ID | <[email protected]> |
It seems like some phones just don't like having a SCO connection up when voice call is not in progress. So instead of actively trying to connect to the phone, I just let the phone connect to my SCO listener socket as needed and I don't have the disconnect problem anymore. i.e. I just had to reverse the server/client direction in my app. There's one remaining problem though. Occasionally, I hear garbage voice on the receive side of SCO. hcidump shows maybe the 16-bit samples are in wrong endianness. This stays like that until the SCO is closed and reestablished. Anyone seen this problem? I will try out a CSR dongle also. Thanks, Michael ----- Original Message ---- From: Marcel Holtmann <[email protected]> To: BlueZ users <[email protected]> Sent: Thursday, May 15, 2008 2:50:32 AM Subject: Re: [Bluez-users] Losing SCO connection Hi Michael, > I wrote a little app that tries to support the hands-free (HF) profile but I am having trouble keeping the SCO connection alive. Using an RFCOMM connection, I am able to establish the HF Service Level Connection per HF Profile specification and then create an SCO connection to a mobile phone. But SCO seems to get disconnected by the phone after about 40-50msec of bidirectional voice data. I can reconnect SCO but the phone disconnects it again. Once in a while, this problem doesn't occur and SCO stays alive. When this happens, I can tear down and bring up the HF setup repeatedly without any problem unless I power cycle the phone or the linux machine. I would like to make it work on consistent basis. > Please note that I am using the bluez lib only. I am not relying on the "services" utilities in the bluez-util package (I turned them all off). Also, my SDP setup code seems to operate okay (i.e. output of "sdptool browse local" looks fine) > Setup: > - Fedora 8 with > kernel 2.6.24.4 > bluez-lib 3.20 > L2CAP v2.9 > RFCOMM v1.8 > SCO v0.5 > - Bluetooth dongle: Targus with Broadcom 2045 - phone: Nokia 6085 > I have tried another phone and another BT dongle and the problem is still there so I am leaning it's either my code or bluez... did you try a CSR based dongle? It looks like the remote side is disconnecting. Maybe it has something to do with your HFP control channel handling. Can't really tell. Regards Marcel ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Bluez-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bluez-users ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/