Kernel: 5.15.113 Bluez: 5.65 Peer: iPad with i.OS 15.7 Application: - Embedded L2CAP application with own agent. - Agent has been registered with "NoInputNoOutput". - BT_SECURITY for L2CAP socket has been set to 2. Problem: Re-pairing (pairing again after "removing"/"ignoring" the Linux device in the system settings of the iOS device) doesn't work. In order to successfully pair again, I first have also to "remove" the iOS device on the Linux system using bluetoothctl. See also (looks equal to my problem): https://stackoverflow.com/questions/75362887/linuxbluezbluetooth-failed-to-re-connect-after-forgetting-while-using-noin I tried the following patch: https://patches.linaro.org/project/linux-bluetooth/patch/20210208220531.3471-2-matias.karhumaa@xxxxxxxxx/ After applying this patch, re-pairing works fine on my system. I don't have the oversight to tell whether the patch above is correct. Additionally I am unsure whether the "JustWorksRepairing" setting has any meaning on my system (as I have implemented an own agent within my application). regards, Christian /etc/bluetooth/main.conf: ------------------------8<------------------------ AlwaysPairable = true JustWorksRepairing = always ------------------------>8------------------------ Log: > ACL Data RX: Handle 25 flags 0x02 dlen 11 #16 [hci0] 2.807328 SMP: Pairing Request (0x01) len 6 IO capability: KeyboardDisplay (0x04) OOB data: Authentication data not present (0x00) Authentication requirement: Bonding, MITM, SC, No Keypresses, CT2 (0x2d) Max encryption key size: 16 Initiator key distribution: EncKey IdKey LinkKey (0x0b) Responder key distribution: EncKey IdKey LinkKey (0x0b) > ACL Data RX: Handle 25 flags 0x02 dlen 11 #17 [hci0] 2.807436 ATT: Read By Group Type Request (0x10) len 6 Handle range: 0x0001-0xffff Attribute group type: Primary Service (0x2800) < ACL Data TX: Handle 25 flags 0x00 dlen 11 #18 [hci0] 2.807514 SMP: Pairing Response (0x02) len 6 IO capability: NoInputNoOutput (0x03) OOB data: Authentication data not present (0x00) Authentication requirement: Bonding, MITM, SC, No Keypresses, CT2 (0x2d) Max encryption key size: 16 Initiator key distribution: EncKey IdKey (0x03) Responder key distribution: EncKey (0x01) ... > ACL Data RX: Handle 25 flags 0x02 dlen 69 #46 [hci0] 8.507352 SMP: Pairing Public Key (0x0c) len 64 X: 8b6f72774ab48d0246be000d4555e2f99f9799518be4bccc3e3e509a31b2ae03 Y: bf3f03e9f08c67b1e843be1ca7a0522686216828becefa40f6622e3322e4db5e < ACL Data TX: Handle 25 flags 0x00 dlen 69 #47 [hci0] 8.545335 SMP: Pairing Public Key (0x0c) len 64 X: 1975cc04c4ef4444a202898c0ad006e01d1ff5fb64b6648fdb585004987c6c28 Y: fbe9d105bd2d0c134618e87ad850443021d3c30d03e452c9be3a67bc071b548e < ACL Data TX: Handle 25 flags 0x00 dlen 21 #48 [hci0] 8.545395 SMP: Pairing Confirm (0x03) len 16 Confim value: 89353a66cb49c378698c73bbb91ed203 > HCI Event: Number of Completed Packets (0x13) plen 5 #49 [hci0] 8.568106 Num handles: 1 Handle: 25 Address: 7F:C0:E4:47:71:5A (Resolvable) Count: 1 > ACL Data RX: Handle 25 flags 0x02 dlen 21 #50 [hci0] 8.597228 SMP: Pairing Random (0x04) len 16 Random value: e31d5e3904a034178b59ee6215691095 @ MGMT Event: User Confirmation Request (0x000f) plen 12 {0x0001} [hci0] 8.597365 LE Address: 54:62:E2:37:6A:A9 (OUI 54-62-E2) Confirm hint: 0x01 Value: 0x00000000 < ACL Data TX: Handle 25 flags 0x00 dlen 21 #51 [hci0] 8.597400 SMP: Pairing Random (0x04) len 16 Random value: 484ff14d26537f86dfbefd924fbd8eb9 @ MGMT Command: User Confirmation Reply (0x001c) plen 7 {0x0001} [hci0] 8.597845 LE Address: 54:62:E2:37:6A:A9 (OUI 54-62-E2) @ MGMT Event: Command Complete (0x0001) plen 10 {0x0001} [hci0] 8.597876 User Confirmation Reply (0x001c) plen 7 Status: Success (0x00) LE Address: 54:62:E2:37:6A:A9 (OUI 54-62-E2) > HCI Event: Number of Completed Packets (0x13) plen 5 #52 [hci0] 8.598099 Num handles: 1 Handle: 25 Address: 7F:C0:E4:47:71:5A (Resolvable) Count: 1 > ACL Data RX: Handle 25 flags 0x02 dlen 21 #53 [hci0] 8.657238 SMP: Pairing DHKey Check (0x0d) len 16 E: 1ffb663bb5033f7127b4fb43fb0e5c00 @ MGMT Event: Authentication Failed (0x0011) plen 8 {0x0001} [hci0] 8.657418 LE Address: 54:62:E2:37:6A:A9 (OUI 54-62-E2) Status: Authentication Failed (0x05) < ACL Data TX: Handle 25 flags 0x00 dlen 6 #54 [hci0] 8.657466 SMP: Pairing Failed (0x05) len 1 Reason: DHKey check failed (0x0b)
