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Date: Mon, 28 Jul 2014 11:21:53 +0300
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Subject: Re: [A2DP] Incoming connections do not succeed
From: Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To: Artem Rakhov <arakhov@chromium.org>
Cc: "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
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Hi Artem,

On Sat, Jul 26, 2014 at 4:33 AM, Artem Rakhov <arakhov@chromium.org> wrote:
> Hello,
>
> I have a problem with A2DP incoming connections. I have a BT speaker
> (Monster Clarity HD), which automatically reconnects on startup to the
> last connected source. It works fine with BlueZ 4, but it never
> reconnects successfully when using BlueZ 5.19
>
> Here is btmon log:
> < ACL Data TX: Handle 21 flags 0x00 dlen 16
>                [hci0] 3471.224113
>       L2CAP: Connection Response (0x03) ident 2 len 8
>         Destination CID: 64
>         Source CID: 108
>         Result: Connection pending (0x0001)
>         Status: Authorization pending (0x0002)
> < ACL Data TX: Handle 21 flags 0x00 dlen 16
>                [hci0] 3471.224313
>       L2CAP: Connection Response (0x03) ident 2 len 8
>         Destination CID: 64
>         Source CID: 108
>         Result: Connection successful (0x0000)
>         Status: No further information available (0x0000)
> < ACL Data TX: Handle 21 flags 0x00 dlen 12
>                [hci0] 3471.224417
>       L2CAP: Configure Request (0x04) ident 2 len 4
>         Destination CID: 108
>         Flags: 0x0000
>> HCI Event: Number of Completed Packets (0x13) plen 5                                [hci0] 3471.226831
>         Num handles: 1
>         Handle: 21
>         Count: 1
>> HCI Event: Number of Completed Packets (0x13) plen 5                                [hci0] 3471.227794
>         Num handles: 1
>         Handle: 21
>         Count: 1
>> HCI Event: Number of Completed Packets (0x13) plen 5                                [hci0] 3471.228807
>         Num handles: 1
>         Handle: 21
>         Count: 1
>> ACL Data RX: Handle 21 flags 0x02 dlen 12                                           [hci0] 3471.256507
>       L2CAP: Disconnection Request (0x06) ident 3 len 4
>         Destination CID: 64
>         Source CID: 108
> < ACL Data TX: Handle 21 flags 0x00 dlen 12
>                [hci0] 3471.256592
>       L2CAP: Disconnection Response (0x07) ident 3 len 4
>         Destination CID: 64
>         Source CID: 108
>> HCI Event: Number of Completed Packets (0x13) plen 5                                [hci0] 3471.258773
>         Num handles: 1
>         Handle: 21
>         Count: 1
>> HCI Event: Vendor (0xff) plen 7                                                     [hci0] 3471.549833
>         82 00 01 00 01 15 00                             .......
>> HCI Event: Disconnect Complete (0x05) plen 4                                        [hci0] 3471.550757
>         Status: Success (0x00)
>         Handle: 21
>         Reason: Remote User Terminated Connection (0x13)
> @ Device Disconnected: 10:B7:F6:01:31:ED (0) reason 3
>
>
> As could be seen from the log, after the source sends L2CAP Configure
> Request the speaker does not answer and disconnects (sends L2CAP
> Disconnection Request).
>
> Debugging avdtp.c showed that processing of incoming connections is
> held in avdtp_confirm_cb() function. There, at some point after
> successful authorization G_IO_ERR and G_IO_HUP events appear. And then
> session_cb() function is called (as callback for these events), which
> drops the connection.

This looks pretty strange as the remote seems to be disconnecting not
us, btw did you tried to mark the device as trusted? Regarding it
working with BlueZ 4, what kernel are you using with that and can you
try to compare what is the difference in the logs, perhaps the remote
does like the Configure Request for some reason.


-- 
Luiz Augusto von Dentz