Re: Unknown Connection Identifier

[Vinicius Costa Gomes <vinicius.gomes@intel.com>]

Hi Johan,

Johan Hedberg <johan.hedberg@gmail.com> writes:

> Hi Fran=C3=A7ois,
>
> On Mon, Nov 30, 2015, Fran=C3=A7ois Beaufort wrote:
>> >> < HCI Command: LE Create Connection (0x08|0x000d) plen 25
>> >>               [hci0] 15.669171
>> >>        Scan interval: 60.000 msec (0x0060)
>> >>        Scan window: 30.000 msec (0x0030)
>> >
>> > we might should have the LE Create Connection scan with a full duty
>> > cycle here. So it does not miss any advertising PDUs.
>>
>> Is this something the Linux Bluetooth team is going to address?
>
> I think this alone might fix the issue you're seeing. Could you please
> try the patch I just sent and see if it solves the issue for you:
>
>   Bluetooth: Use continuous scanning when creating LE connections

I ended up with the same problem using the 4.3 kernel.

The patch seems to solve the issue, and could perhaps be submitted to
-stable.

I gave it a few tries trying to connect to a Parrot Flower Power, and
got into a situation that may indicate a possible race condition:

(this line: '< HCI Command: LE Create Connection Cancel... ')

< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7                 =
             [hci0] 20.602345
        Type: Passive (0x00)
        Interval: 60.000 msec (0x0060)
        Window: 30.000 msec (0x0030)
        Own address type: Public (0x00)
        Filter policy: Ignore not in white list (0x01)
> HCI Event: Command Complete (0x0e) plen 4                                =
             [hci0] 20.603330
      LE Set Scan Parameters (0x08|0x000b) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2                     =
             [hci0] 20.603348
        Scanning: Enabled (0x01)
        Filter duplicates: Enabled (0x01)
> HCI Event: Command Complete (0x0e) plen 4                                =
             [hci0] 20.604339
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 36                                  =
             [hci0] 21.508266
      LE Advertising Report (0x02)
        Num reports: 1
        Event type: Connectable undirected - ADV_IND (0x00)
        Address type: Public (0x00)
        Address: A0:14:3D:08:B5:36 (PARROT SA)
        Data length: 24
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
        128-bit Service UUIDs (partial): 1 entry
          39e1fa00-84a8-11e2-afba-0002a5d5c51b
        RSSI: -59 dBm (0xc5)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2                     =
             [hci0] 21.508332
        Scanning: Disabled (0x00)
        Filter duplicates: Disabled (0x00)
> HCI Event: Command Complete (0x0e) plen 4                                =
             [hci0] 21.510342
      LE Set Scan Enable (0x08|0x000c) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Create Connection (0x08|0x000d) plen 25                  =
             [hci0] 21.510396
        Scan interval: 60.000 msec (0x0060)
        Scan window: 60.000 msec (0x0060)
        Filter policy: White list is not used (0x00)
        Peer address type: Public (0x00)
        Peer address: A0:14:3D:08:B5:36 (PARROT SA)
        Own address type: Public (0x00)
        Min connection interval: 50.00 msec (0x0028)
        Max connection interval: 70.00 msec (0x0038)
        Connection latency: 0x0000
        Supervision timeout: 420 msec (0x002a)
        Min connection length: 0.000 msec (0x0000)
        Max connection length: 0.000 msec (0x0000)
> HCI Event: Command Status (0x0f) plen 4                                  =
             [hci0] 21.512248
      LE Create Connection (0x08|0x000d) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Create Connection Cancel (0x08|0x000e) plen 0            =
             [hci0] 23.512098
> HCI Event: LE Meta Event (0x3e) plen 19                                  =
             [hci0] 23.514370
      LE Connection Complete (0x01)
        Status: Success (0x00)
        Handle: 64
        Role: Master (0x00)
        Peer address type: Public (0x00)
        Peer address: A0:14:3D:08:B5:36 (PARROT SA)
        Connection interval: 67.50 msec (0x0036)
        Connection latency: 0.00 msec (0x0000)
        Supervision timeout: 420 msec (0x002a)
        Master clock accuracy: 0x05
@ Device Connected: A0:14:3D:08:B5:36 (1) flags 0x0000
        02 01 06 11 06 1b c5 d5 a5 02 00 ba af e2 11 a8  ................
        84 00 fa e1 39 02 ff 03                          ....9...
> HCI Event: Command Complete (0x0e) plen 4                                =
             [hci0] 23.519286
      LE Create Connection Cancel (0x08|0x000e) ncmd 1
        Status: Command Disallowed (0x0c)
< HCI Command: LE Read Remote Used Features (0x08|0x0016) plen 2           =
             [hci0] 23.519347
        Handle: 64
> HCI Event: Command Status (0x0f) plen 4                                  =
             [hci0] 23.520302
      LE Read Remote Used Features (0x08|0x0016) ncmd 1
        Status: Success (0x00)
> HCI Event: LE Meta Event (0x3e) plen 12                                  =
             [hci0] 23.632256
      LE Read Remote Used Features (0x04)
        Status: Success (0x00)
        Handle: 64
        Features: 0x01 0x00 0x00 0x00 0x00 0x00 0x00 0x00
          LE Encryption
< ACL Data TX: Handle 64 flags 0x00 dlen 11                                =
             [hci0] 23.632361
      SMP: Pairing Request (0x01) len 6
        IO capability: NoInputNoOutput (0x03)
        OOB data: Authentication data not present (0x00)
        Authentication requirement: Bonding, No MITM, SC, No Keypresses (0x=
09)
        Max encryption key size: 16
        Initiator key distribution: EncKey Sign LinkKey (0x0d)
        Responder key distribution: EncKey IdKey Sign LinkKey (0x0f)


>
> Johan
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Cheers,
--
Vinicius