[maemo-developers] [maemo-developers] Bluetooth headset - not really working?

From: Razvan Dragomirescu razvan.dragomirescu at gmail.com
Date: Sun Dec 18 20:23:23 EET 2005
Hello everyone,

I have spent the past 2 days trying to get a JABRA 250 Bluetooth headset to
work with my Nokia 770. I followed the instructions at
http://maemo.org/maemowiki/BluetoothHeadset and everything went fine, up to
the point described in the Wiki. I have also compiled the alsa-utils package
to get the "aplay" utility and tried to play some sound.

Nokia770-45:~# ./aplay -D plughw:Headset /media/mmc1/xp.wav
Playing WAVE '/media/mmc1/xp.wav' : Signed 16 bit Little Endian, Rate 22050
Hz, Stereo

This command never returns unless I press ctrl-c and kill it. There seems to
be some sort of connection established, but all I hear in the headset is
some hissing and popping, I have no idea how to describe it. It's definitely
not silence, but it has no connection to the content of the WAV being played
either. Here's what btsco says during all this:

Nokia770-45:~# btsco -v 00:07:A4:03:33:33 1
btsco v0.4c
Device is 1:0
Voice setting: 0x0060
RFCOMM channel 1 connected
Nokia770-45:~# btsco -v 00:07:A4:03:33:33 1
btsco v0.4c
Device is 1:0
Voice setting: 0x0060
RFCOMM channel 1 connected
speaker volume: 0 mic volume: 0
i/o needed: connecting sco...
connected SCO channel
Done setting sco fd
recieved AT+VGS=11
Sending up speaker change 11
speaker volume: 11 mic volume: 1
driver is not in use
disconnected SCO channel

The last 2 lines appear after I press CTRL-C to kill "aplay" and then CTRL-C
to kill btsco.

The same hissing/popping sounds are heard when using the "hstest" tool from
bluez-utils (this one plays the sound directly over Bluetooth as far as I
can tell). And also the same type of sound is heard when using
chan_bluetooth (http://www.crazygreek.co.uk/content/chan_bluetooth) with the
ported version of Asterisk on the Nokia 770.

This seems to have been reported before (not for the 770):
http://sourceforge.net/tracker/index.php?func=detail&aid=1273754&group_id=116589&atid=678258
.
However, the solution "pskey mapsco 0" only seems to work with CSR Bluetooth
chips, and the 770 has a TI chip.

If anyone's interested, I'm attaching the output of a "hcidump -X -V" during
all this.

HCI sniffer - Bluetooth packet analyzer ver 1.28
< HCI Command: Read Voice Setting (0x03|0x0025) plen 0
> HCI Event: Command Complete (0x0e) plen 6
< HCI Command: Create Connection (0x01|0x0005) plen 13
> HCI Event: Command Status (0x0f) plen 4
> HCI Event: Link Key Request (0x17) plen 6
< HCI Command: Link Key Request Reply (0x01|0x000b) plen 22
> HCI Event: Command Complete (0x0e) plen 10
> HCI Event: Connect Complete (0x03) plen 11
< ACL data: handle 1 flags 0x02 dlen 12
    L2CAP(s): Connect req: psm 3 scid 0x0040
< HCI Command: Write Link Policy Settings (0x02|0x000d) plen 4
> HCI Event: Command Complete (0x0e) plen 6
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 16
    L2CAP(s): Connect rsp: dcid 0x0048 scid 0x0040 result 1 status 2
      Connection pending - Authorization pending
> ACL data: handle 1 flags 0x02 dlen 16
    L2CAP(s): Connect rsp: dcid 0x0048 scid 0x0040 result 0 status 0
      Connection successful
< ACL data: handle 1 flags 0x02 dlen 16
    L2CAP(s): Config req: dcid 0x0048 flags 0x00 clen 4
      MTU 1024
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 14
    L2CAP(s): Config rsp: scid 0x0040 flags 0x00 result 0 clen 0
      Success
> ACL data: handle 1 flags 0x02 dlen 16
    L2CAP(s): Config req: dcid 0x0040 flags 0x00 clen 4
      MTU 1024
< ACL data: handle 1 flags 0x02 dlen 14
    L2CAP(s): Config rsp: scid 0x0048 flags 0x00 result 0 clen 0
      Success
< ACL data: handle 1 flags 0x02 dlen 8
    L2CAP(d): cid 0x0048 len 4 [psm 3]
      RFCOMM(s): SABM: cr 1 dlci 0 pf 1 ilen 0 fcs 0x1c
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 8
    L2CAP(d): cid 0x0040 len 4 [psm 3]
      RFCOMM(s): UA: cr 1 dlci 0 pf 1 ilen 0 fcs 0xd7
< ACL data: handle 1 flags 0x02 dlen 18
    L2CAP(d): cid 0x0048 len 14 [psm 3]
      RFCOMM(s): PN CMD: cr 1 dlci 0 pf 0 ilen 10 fcs 0x70 mcc_len 8
      dlci 2 frame_type 0 credit_flow 15 pri 7 ack_timer 0
      frame_size 1019 max_retrans 0 credits 7
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 18
    L2CAP(d): cid 0x0040 len 14 [psm 3]
      RFCOMM(s): PN RSP: cr 0 dlci 0 pf 0 ilen 10 fcs 0xaa mcc_len 8
      dlci 2 frame_type 0 credit_flow 14 pri 7 ack_timer 0
      frame_size 127 max_retrans 0 credits 0
< ACL data: handle 1 flags 0x02 dlen 8
    L2CAP(d): cid 0x0048 len 4 [psm 3]
      RFCOMM(s): SABM: cr 1 dlci 2 pf 1 ilen 0 fcs 0x59
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 8
    L2CAP(d): cid 0x0040 len 4 [psm 3]
      RFCOMM(s): UA: cr 1 dlci 2 pf 1 ilen 0 fcs 0x92
< ACL data: handle 1 flags 0x02 dlen 12
    L2CAP(d): cid 0x0048 len 8 [psm 3]
      RFCOMM(s): MSC CMD: cr 1 dlci 0 pf 0 ilen 4 fcs 0x70 mcc_len 2
      dlci 2 fc 0 rtc 1 rtr 1 ic 0 dv 1 b1 0 b2 0 b3 0 len 0
> ACL data: handle 1 flags 0x02 dlen 12
    L2CAP(d): cid 0x0040 len 8 [psm 3]
      RFCOMM(s): MSC CMD: cr 0 dlci 0 pf 0 ilen 4 fcs 0xaa mcc_len 2
      dlci 2 fc 0 rtc 1 rtr 1 ic 0 dv 0 b1 0 b2 0 b3 0 len 0
< ACL data: handle 1 flags 0x02 dlen 12
    L2CAP(d): cid 0x0048 len 8 [psm 3]
      RFCOMM(s): MSC RSP: cr 1 dlci 0 pf 0 ilen 4 fcs 0x70 mcc_len 2
      dlci 2 fc 0 rtc 1 rtr 1 ic 0 dv 0 b1 0 b2 0 b3 0 len 0
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 12
    L2CAP(d): cid 0x0040 len 8 [psm 3]
      RFCOMM(s): MSC RSP: cr 0 dlci 0 pf 0 ilen 4 fcs 0xaa mcc_len 2
      dlci 2 fc 0 rtc 1 rtr 1 ic 0 dv 1 b1 0 b2 0 b3 0 len 0
< ACL data: handle 1 flags 0x02 dlen 9
    L2CAP(d): cid 0x0048 len 5 [psm 3]
      RFCOMM(d): UIH: cr 1 dlci 2 pf 1 ilen 0 fcs 0x86 credits 33
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 9
    L2CAP(d): cid 0x0040 len 5 [psm 3]
      RFCOMM(d): UIH: cr 0 dlci 2 pf 1 ilen 0 fcs 0x5c credits 15
> HCI Event: Mode Change (0x14) plen 6
< HCI Command: Add SCO Connection (0x01|0x0007) plen 4
> HCI Event: Command Status (0x0f) plen 4
> HCI Event: Connect Complete (0x03) plen 11
> ACL data: handle 1 flags 0x02 dlen 18
    L2CAP(d): cid 0x0040 len 14 [psm 3]
      RFCOMM(d): UIH: cr 0 dlci 2 pf 0 ilen 10 fcs 0x40
< ACL data: handle 1 flags 0x02 dlen 14
    L2CAP(d): cid 0x0048 len 10 [psm 3]
      RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 6 fcs 0x9a
> HCI Event: Number of Completed Packets (0x13) plen 5
< ACL data: handle 1 flags 0x02 dlen 18
    L2CAP(d): cid 0x0048 len 14 [psm 3]
      RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 10 fcs 0x9a
< ACL data: handle 1 flags 0x02 dlen 17
    L2CAP(d): cid 0x0048 len 13 [psm 3]
      RFCOMM(d): UIH: cr 1 dlci 2 pf 0 ilen 9 fcs 0x9a
< HCI Command: Disconnect (0x01|0x0006) plen 3
> HCI Event: Command Status (0x0f) plen 4
> HCI Event: Number of Completed Packets (0x13) plen 5
> HCI Event: Disconn Complete (0x05) plen 4
< ACL data: handle 1 flags 0x02 dlen 8
    L2CAP(d): cid 0x0048 len 4 [psm 3]
      RFCOMM(s): DISC: cr 1 dlci 2 pf 1 ilen 0 fcs 0xb8
> HCI Event: Number of Completed Packets (0x13) plen 5
> ACL data: handle 1 flags 0x02 dlen 8
    L2CAP(d): cid 0x0040 len 4 [psm 3]
      RFCOMM(s): UA: cr 1 dlci 2 pf 1 ilen 0 fcs 0x92
< ACL data: handle 1 flags 0x02 dlen 8
    L2CAP(d): cid 0x0048 len 4 [psm 3]
      RFCOMM(s): DISC: cr 1 dlci 0 pf 1 ilen 0 fcs 0xfd
< ACL data: handle 1 flags 0x02 dlen 12
    L2CAP(s): Disconn req: dcid 0x0048 scid 0x0040

Has anyone been successful in establishing SCO connections between a Nokia
770 and a Bluetooth headset? According to this:
http://article.gmane.org/gmane.linux.bluez.devel/6728 , Nokia is working on
Bluetooth headset support. Could anyone at Nokia give us an update?

Thank you,
Razvan


--
Razvan Dragomirescu
Chief Technology Officer
Cayenne Graphics SRL
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