Hi andrea
Same problem used to occur with me.
My hciconfig also used to show this sco mtu
SCO MTU: 64:0
whereas others on the list it was something SCO MTU: 64:8.
So i changed my dongle. and it simply worked.
I bought one new BT dongle which clamed it supports HS audio Gtaeway.
It is a product of ENTER multimedia.
this is it.
[root@localhost Pramod]# /usr/local/sbin/hciconfig -a
hci0:   Type: USB
        BD Address: 11:11:11:11:11:11 ACL MTU: 678:8 SCO MTU: 48:10
        UP RUNNING PSCAN ISCAN
        RX bytes:10283222 acl:386 sco:201151 events:719 errors:0
        TX bytes:10319322 acl:347 sco:202172 commands:192 errors:0
        Features: 0xbf 0xfe 0x8d 0x78 0x08 0x18 0x00 0x00
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'BlueZ (0)'
        Class: 0x080100
        Service Classes: Capturing
        Device Class: Computer, Uncategorized
        HCI Ver: 1.2 (0x2) HCI Rev: 0x1fe LMP Ver: 1.2 (0x2) LMP Subver: 0x1fe
        Manufacturer: Integrated System Solution Corp. (57)

I tried all option from list about sco but they never worked.
You too can try them. But before that try replacing your BT dongle.
It will save your time.

Thanks and Best regards

Pramod

----- Original Message ----
From: Andrea Bondavalli <Andrea.Bondavalli@qtm.it>
To: Bluez-users@lists.sourceforge.net
Sent: Wednesday, 27 February, 2008 8:44:09 PM
Subject: [Bluez-users] BT headset doesn't work: SCO connection timeout

Dear all,

I’ve got a linux kernel 2.4.20 with bluez libs/utils 3.23 on a ARM linux platform.

I can successfully ping and pair my headset, but I am not able to connect a SCO channel.

As soon as I try to connect a SCO channel (using the scotest utility, and also other applications) the call always fails with a timeout error.

Here are some useful traces:

# hciconfig
hci0:   Type: UART
        BD Address: 00:80:E1:00:AB:BA ACL MTU: 1021:4 SCO MTU: 64:0
        UP RUNNING PSCAN ISCAN
        RX bytes:10150 acl:204 sco:0 events:326 errors:0
        TX bytes:4097 acl:168 sco:0 commands:81 errors:0

# hciconfig hci0 revision

STLC2500 R4.2 12102005 12:40:14 ZAV100012 A7
HW Id= V440BAA

# hciconfig hci0 version
hci0:   Type: UART
        BD Address: 00:80:E1:00:AB:BA ACL MTU: 1021:4 SCO MTU: 64:0
        HCI Ver: 2.0 (0x3) HCI Rev: 0x402 LMP Ver: 2.0 (0x3) LMP Subver: 0x520
        Manufacturer: ST Microelectronics (48)
--------------------------------------------------------------------

Ping output is OK:

# passkey-agent 0000 00:12:1C:BB:01:98 &
# l2ping 00:12:1C:BB:01:98
Passkey request for device 00:12:1C:BB:01:98
Passkey service has been released
Ping : 00:12:1C:BB:01:98 from 00:80:E1:00:AB:BA (data size 44) ...
0 bytes from 00:12:1C:BB:01:98 id 0 time 101.29ms
0 bytes from 00:12:1C:BB:01:98 id 1 time 48.42ms
0 bytes from 00:12:1C:BB:01:98 id 2 time 52.15ms
0 bytes from 00:12:1C:BB:01:98 id 3 time 36.95ms
0 bytes from 00:12:1C:BB:01:98 id 4 time 60.60ms
0 bytes from 00:12:1C:BB:01:98 id 5 time 43.05ms
0 bytes from 00:12:1C:BB:01:98 id 6 time 48.42ms
0 bytes from 00:12:1C:BB:01:98 id 7 time 96.63ms
0 bytes from 00:12:1C:BB:01:98 id 8 time 60.66ms
0 bytes from 00:12:1C:BB:01:98 id 9 time 62.69ms
0 bytes from 00:12:1C:BB:01:98 id 10 time 41.35ms
11 sent, 11 received, 0% loss

--------------------------------------------------------------------

scotest (from bluez-utils-3.23) output

# hcidump -X
HCI sniffer - Bluetooth packet analyzer ver 1.40
device: hci0 snap_len: 1028 filter: 0xffffffff

# passkey-agent 0000 00:12:1C:BB:01:98 &

# scotest -s 00:12:1C:BB:01:98 &

< HCI Command: Create Connection (0x01|0x0005) plen 13
0000: 98 01 bb 1c 12 00 18 cc 02 00 00 00 01           .............
> HCI Event: Command Status (0x0f) plen 4
0000: 00 01 05 04                                       ....
> HCI Event: Role Change (0x12) plen 8
0000: 00 98 01 bb 1c 12 00 01                           ........
> HCI Event: Link Key Request (0x17) plen 6
0000: 98 01 bb 1c 12 00                                 ......
< HCI Command: Link Key Request Negative Reply (0x01|0x000c) plen 6
0000: 98 01 bb 1c 12 00                                 ......
> HCI Event: Command Complete (0x0e) plen 10
0000: 01 0c 04 00 98 01 bb 1c 12 00                    ..........
> HCI Event: PIN Code Request (0x16) plen 6
0000: 98 01 bb 1c 12 00                                 ......
Passkey request for device 00:12:1C:BB:01:98
< HCI Command: PIN Code Request Reply (0x01|0x000d) plen 23
0000: 98 01 bb 1c 12 00 04 30 30 30 30 00 00 00 00 00 .......0000.....
0010: 00 00 00 00 00 00 00                              .......
Passkey service has been released
> HCI Event: Command Complete (0x0e) plen 10
0000: 01 0d 04 00 98 01 bb 1c 12 00                    ...........
> HCI Event: Link Key Notification (0x18) plen 23
0000: 98 01 bb 1c 12 00 11 a5 89 24 9a 6a 5b d8 44 07 ..........$.j[.D.
0010: 3a e8 13 4e 0f 06 00                              :..N...
> HCI Event: Connect Complete (0x03) plen 11
0000: 00 01 00 98 01 bb 1c 12 00 01 00                 ...........
> HCI Event: Command Status (0x0f) plen 4
0000: 00 02 00 00                                       ....
< HCI Command: Write Link Policy Settings (0x02|0x000d) plen 4
0000: 01 00 0f 00                                       .....
> HCI Event: Max Slots Change (0x1b) plen 3
0000: 01 00 05                                          ...
> HCI Event: Command Complete (0x0e) plen 6
0000: 02 0d 08 00 01 00                                 ......
< HCI Command: Add SCO Connection (0x01|0x0007) plen 4
0000: 01 00 a0 00                                       ....
> HCI Event: Command Complete (0x0e) plen 4
0000: 02 07 04 01                                       ....
< HCI Command: Remote Name Request (0x01|0x0019) plen 10
0000: 98 01 bb 1c 12 00 02 00 00 00                    ...........
> HCI Event: Command Status (0x0f) plen 4
0000: 00 01 19 04                                       ....
> HCI Event: Remote Name Req Complete (0x07) plen 255
0000: 00 98 01 bb 1c 12 00 50 61 72 72 6f 74 20 4d 4b .......Parrot MK
0010: 36 30 30 30 76 31 2e 30 31 63 00 00 00 00 00 00 6000v1.01c......
0020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 .................
0030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 .................
0060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 .................
00d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     ...............
> HCI Event: Command Status (0x0f) plen 4
0000: 00 02 00 00                                       ....
< HCI Command: Read Remote Version Information (0x01|0x001d) plen 2
0000: 01 00                                             ..
> HCI Event: Command Status (0x0f) plen 4
0000: 00 01 1d 04                                       ....
> HCI Event: Read Remote Ver Info Complete (0x0c) plen 8
0000: 00 01 00 02 43 00 1c 01                           ....C...
> HCI Event: Command Status (0x0f) plen 4
0000: 00 02 00 00                                       ....
scotest[104]: Can't connect: Connection timed out (110)

It seems that the only reply to the Add SCO Connection command is an unexpected Command Complete event and than the connect() system call fails with a timeout (40sec) error.

As far as I know the only possible replies to the Add SCO Connection command should be the Command Status event and the Command Complete event.

Have you ever experienced this problem ? Any hints ?

Thank you a lot in advance,

Andrea Bondavalli

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