Re: connection failed with bluez 3.30 (and 3.36)

"David Stockwell" <dstockwell@xxxxxxxxxxxxxxxxx> · Wed, 16 Jul 2008 15:58:21 -0500

I have also noticed this, with essentially the same 
hcidump, on AMD-based Linux (with Marcel's patches) with 
bluez-utils-3.36: once the pairing is complete, the last L2CAP connection is 
dropped and the ACL connection is dropped.  It seems to me that this 
happens in hcid/dbus-hci.c function hcid_dbus_binding_process_complete in the 
cleanup section, possibly in response to g_io_channel_close.

What is puzzling to me is that the HCI code is 
0x13, which is not used in this section of code.

FWIW, it did try pressing beyond this dropped ACL 
by just allowing the remote-side application to reestablish its AVRCP connection 
and all seems to work OK.  However, I can also see how dropping the ACL 
connection after pairing would cause some/many devices to fail to connect.  
This behavior was very unexpected for me, and I spent a week or so instrumenting 
the BlueZ code in adapter.c, device.c and dbus-hci.c before I reached this 
point, only to find that I could work around it (with the bonding already 
completed, the remote device can just simply connect, or so it 
seems).

DS

  ----- Original Message ----- 
  From: 
  Pierre Savary 
  To: bluez-users@xxxxxxxxxxxxxxxxxxxxx 
  ; BlueZ-Dev 
  Sent: Wednesday, July 16, 2008 1:06 
  PM
  Subject:  connection failed 
  with bluez 3.30

  Hi all,
  I updated my design (ARM9 + linux-2.6.23) 
  with the bluez (libs and utils) 3.30-3. I also uptaded all the necessary 
  libraries, dbus, etc? Since this update my nokia 6120, N95 and E60 cannot be 
  connected? and it worked before (bluez 3.16). Some others phone work fine (all 
  SonyEricsson, Nokia 6234).
  Here the hcidump :

  [root@kap 
  /root]$hcidump
  HCI sniffer - 
  Bluetooth packet analyzer ver 1.42
  device: hci0 
  snap_len: 1028 filter: 0xffffffff
  > HCI Event: 
  Connect Request (0x04) plen 10
  < HCI 
  Command: Accept Connection Request (0x01|0x0009) plen 
  7
  > HCI Event: 
  Command Status (0x0f) plen 4
  > HCI Event: 
  Connect Complete (0x03) plen 11
  < HCI 
  Command: Read Remote Supported Features (0x01|0x001b) plen 
  2
  > HCI Event: Page Scan 
  Repetition Mode Change (0x20) plen 7
  > HCI Event: 
  Max Slots Change (0x1b) plen 3
  > HCI Event: 
  Command Status (0x0f) plen 4
  > HCI Event: 
  Command Status (0x0f) plen 4
  < HCI 
  Command: Write Link Policy Settings (0x02|0x000d) plen 
  4
  > HCI Event: 
  Command Complete (0x0e) plen 6
  < HCI 
  Command: Change Connection Packet Type (0x01|0x000f) plen 
  4
  > HCI Event: 
  Read Remote Supported Features (0x0b) plen 11
  > ACL data: 
  handle 42 flags 0x02 dlen 12
      L2CAP(s): Connect req: psm 1 scid 
  0x0040
  < ACL data: 
  handle 42 flags 0x02 dlen 16
      L2CAP(s): Connect rsp: dcid 0x0040 
  scid 0x0040 result 0 status 0
        Connection 
  successful
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  > ACL data: 
  handle 42 flags 0x02 dlen 10
      L2CAP(s): Info req: type 
  2
  < ACL data: 
  handle 42 flags 0x02 dlen 12
      L2CAP(s): Info rsp: type 2 result 
  1
        Not 
  supported
  > HCI Event: 
  Command Status (0x0f) plen 4
  < HCI 
  Command: Remote Name Request (0x01|0x0019) plen 10
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  > HCI Event: 
  Connection Packet Type Changed (0x1d) plen 5
  > HCI Event: 
  Command Status (0x0f) plen 4
  > HCI Event: 
  Remote Name Req Complete (0x07) plen 255
  > ACL data: 
  handle 42 flags 0x02 dlen 16
      L2CAP(s): Config req: dcid 0x0040 
  flags 0x00 clen 4
        MTU 
  65535
  < ACL data: 
  handle 42 flags 0x02 dlen 18
      L2CAP(s): Config rsp: scid 0x0040 
  flags 0x00 result 0 clen 4
        MTU 
  65535
  < ACL data: 
  handle 42 flags 0x02 dlen 12
      L2CAP(s): Config req: dcid 0x0040 
  flags 0x00 clen 0
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  > ACL data: 
  handle 42 flags 0x02 dlen 18
      L2CAP(s): Config rsp: scid 0x0040 
  flags 0x00 result 0 clen 4
        MTU 
  672
  > ACL data: 
  handle 42 flags 0x02 dlen 17
      L2CAP(d): cid 0x0040 len 13 [psm 
  1]
          SDP SS Req: 
  tid 0x1 len 0x8

  pat uuid-16 0x110b (AudioSink)

  max 65535

  cont 00
  < ACL data: 
  handle 42 flags 0x02 dlen 14
      L2CAP(d): cid 0x0040 len 10 [psm 
  1]
          SDP SS Rsp: 
  tid 0x1 len 0x5

  count 0

  cont 00
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  > ACL data: 
  handle 42 flags 0x02 dlen 17
      L2CAP(d): cid 0x0040 len 13 [psm 
  1]
          SDP SS Req: 
  tid 0x2 len 0x8

  pat uuid-16 0x111e (Handsfree)

  max 65535

  cont 00
  < ACL data: 
  handle 42 flags 0x02 dlen 14
      L2CAP(d): cid 0x0040 len 10 [psm 
  1]
          SDP SS Rsp: 
  tid 0x2 len 0x5

  count 0

      cont 00
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  > ACL data: 
  handle 42 flags 0x02 dlen 17
      L2CAP(d): cid 0x0040 len 13 [psm 
  1]
          SDP SS Req: 
  tid 0x3 len 0x8

  pat uuid-16 0x1108 (Headset)

  max 65535

  cont 00
  < ACL data: 
  handle 42 flags 0x02 dlen 14
      L2CAP(d): cid 0x0040 len 10 [psm 
  1]
          SDP SS Rsp: 
  tid 0x3 len 0x5

  count 0

  cont 00
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  > ACL data: 
  handle 42 flags 0x02 dlen 17

    L2CAP(d): cid 0x0040 len 13 [psm 1]
          SDP SS Req: 
  tid 0x4 len 0x8

  pat uuid-16 0x110c (AVRemTarget)

  max 65535

  cont 00
  < ACL data: 
  handle 42 flags 0x02 dlen 14
      L2CAP(d): cid 0x0040 len 10 [psm 
  1]
          SDP SS Rsp: 
  tid 0x4 len 0x5

  count 0

  cont 00
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  > ACL data: 
  handle 42 flags 0x02 dlen 31
      L2CAP(d): cid 0x0040 len 27 [psm 
  1]
          SDP SS Req: 
  tid 0x5 len 0x16

  pat uuid-128 00005555-0000-1000-8000-0002ee000001

  max 65535

  cont 00
  < ACL data: 
  handle 42 flags 0x02 dlen 14
      L2CAP(d): cid 0x0040 len 10 [psm 
  1]
          SDP SS Rsp: 
  tid 0x5 len 0x5

  count 0

  cont 00
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  > ACL data: 
  handle 42 flags 0x02 dlen 12
      L2CAP(s): Disconn req: dcid 0x0040 
  scid 0x0040
  < ACL data: 
  handle 42 flags 0x02 dlen 12
      L2CAP(s): Disconn rsp: dcid 0x0040 
  scid 0x0040
  > HCI Event: 
  Number of Completed Packets (0x13) plen 5
  < HCI 
  Command: Disconnect (0x01|0x0006) plen 3
  > HCI Event: 
  Command Status (0x0f) plen 4
  > HCI Event: 
  Disconn Complete (0x05) plen 4

  Thanks in advance for your 
  help.
  Best Regards

  Pierre
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