Hi Johan,
Johan Hedberg <johan.hedberg@xxxxxxxxx> writes:
> Hi François,
>
> On Mon, Nov 30, 2015, François 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 (0x09)
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
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