Return-Path: From: Vinicius Costa Gomes To: Johan Hedberg , =?utf-8?Q?Fran=C3=A7ois?= Beaufort Cc: Marcel Holtmann , Szymon Janc , linux-bluetooth@vger.kernel.org Subject: Re: Unknown Connection Identifier In-Reply-To: <20151130105141.GA12764@t440s.lan> References: <2045332.GytFuFKTvp@ix> <2DBBB005-93A7-47ED-8E88-1D6B92ACCC07@holtmann.org> <20151130105141.GA12764@t440s.lan> Date: Mon, 30 Nov 2015 20:20:38 -0200 Message-ID: <877fkz5du1.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 List-ID: Hi Johan, Johan Hedberg 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 > -- > To unsubscribe from this list: send the line "unsubscribe linux-bluetooth= " in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html Cheers, -- Vinicius