BLE IN node keeps on unpairing and deleting BLE devices - help needed!

[habakuk1979]

Hello!

I am working on Bluez 5.53 on Kernel 5.13 Ubuntu 18.04

since months I am trying to get this package reliably working now, but I cannot overcome the issue that

the BLE in node

aggressively keeps on unpairing and even removing fomerly absolutely correctly paired devices.
(btmon):

---

@ MGMT Command: Stop Discovery (0x0024) plen 1 {0x0001} [hci0] 97.862810
Address type: 0x07
BR/EDR
LE Public
LE Random
< HCI Command: Inquiry Cancel (0x01|0x0002) plen 0 #259 [hci0] 97.862918

HCI Event: Command Complete (0x0e) plen 4 #260 [hci0] 97.866692
Inquiry Cancel (0x01|0x0002) ncmd 1
Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 #261 [hci0] 97.866760
Scanning: Disabled (0x00)
Filter duplicates: Disabled (0x00)
HCI Event: Command Complete (0x0e) plen 4 #262 [hci0] 97.887693
LE Set Scan Enable (0x08|0x000c) ncmd 1
Status: Success (0x00)
@ MGMT Event: Command Complete (0x0001) plen 4 {0x0001} [hci0] 97.887811
Stop Discovery (0x0024) plen 1
Status: Success (0x00)
Address type: 0x07
BR/EDR
LE Public
LE Random
@ MGMT Event: Discovering (0x0013) plen 2 {0x0001} [hci0] 97.887833
Address type: 0x07
BR/EDR
LE Public
LE Random
Discovery: Disabled (0x00)
@ MGMT Event: Discovering (0x0013) plen 2 {0x0002} [hci0] 97.887833
Address type: 0x07
BR/EDR
LE Public
LE Random
Discovery: Disabled (0x00)
@ MGMT Command: Remove Device (0x0034) plen 7 {0x0001} [hci0] 97.916065
BR/EDR Address: C0:E4:80:CA:A3:F0 (OUI C0-E4-80)
@ MGMT Event: Device Removed (0x001b) plen 7 {0x0002} [hci0] 97.916174
BR/EDR Address: C0:E4:80:CA:A3:F0 (OUI C0-E4-80)
@ MGMT Event: Command Complete (0x0001) plen 10 {0x0001} [hci0] 97.916184
Remove Device (0x0034) plen 7
Status: Success (0x00)
BR/EDR Address: C0:E4:80:CA:A3:F0 (OUI C0-E4-80)
< HCI Command: Write Scan Enable (0x03|0x001a) plen 1 #263 [hci0] 97.916229
Scan enable: No Scans (0x00)
@ MGMT Command: Unpair Device (0x001b) plen 8 {0x0001} [hci0] 97.916435
LE Address: C0:E4:80:CA:A3:F0 (Static)
Disconnect: Enabled (0x01)
@ MGMT Event: Command Complete (0x0001) plen 10 {0x0001} [hci0] 97.916455
Unpair Device (0x001b) plen 7
Status: Success (0x00)
LE Address: C0:E4:80:CA:A3:F0 (Static)
@ MGMT Event: Device Unpaired (0x0016) plen 7 {0x0002} [hci0] 97.916460
LE Address: C0:E4:80:CA:A3:F0 (Static)
HCI Event: Command Complete (0x0e) plen 4 #264 [hci0] 97.917702
Write Scan Enable (0x03|0x001a) ncmd 1
Status: Success (0x00)

---

However this dramatically results in deleted

var/lib/bluetooth/"adapter"/"peripheral-device"/info - file (which holds all the pairing key information)!

Exactly the same happens when you try to connect to a paired device via your BLE IN node and the connection becomes rejected or breaks whatr happens ofcours every once in a while:
(btmon)

---

@ MGMT Event: Device Connected (0x000b) plen 36 {0x0001} [hci0] 65.298536
LE Address: C0:E4:80:CA:A3:F0 (Static)
Flags: 0x00000000
Data length: 23
Flags: 0x02
LE General Discoverable Mode
16-bit Service UUIDs (partial): 1 entry
GoPro, Inc. (0xfea6)
Company: GoPro, Inc. (754)
Data: 0103133f00f0a3ca80e4c00f
@ MGMT Event: Device Connected (0x000b) plen 36 {0x0002} [hci0] 65.298536
LE Address: C0:E4:80:CA:A3:F0 (Static)
Flags: 0x00000000
Data length: 23
Flags: 0x02
LE General Discoverable Mode
16-bit Service UUIDs (partial): 1 entry
GoPro, Inc. (0xfea6)
Company: GoPro, Inc. (754)
Data: 0103133f00f0a3ca80e4c00f
< HCI Command: LE Read Remote Use.. (0x08|0x0016) plen 2 #237 [hci0] 65.298733
Handle: 70

HCI Event: Command Status (0x0f) plen 4 #238 [hci0] 65.302521
LE Read Remote Used Features (0x08|0x0016) ncmd 0
Status: Success (0x00)
@ MGMT Command: Start Service Disc.. (0x003a) plen 4 {0x0001} [hci0] 65.499034
Address type: 0x07
BR/EDR
LE Public
LE Random
RSSI: invalid (0x7f)
UUIDs: 0
HCI Event: Disconnect Complete (0x05) plen 4 #239 [hci0] 65.594510
Status: Success (0x00)
Handle: 70
Reason: Connection Failed to be Established (0x3e)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0001} [hci0] 65.594557
LE Address: C0:E4:80:CA:A3:F0 (Static)
Reason: Unspecified (0x00)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0002} [hci0] 65.594557
LE Address: C0:E4:80:CA:A3:F0 (Static)
Reason: Unspecified (0x00)
HCI Event: LE Meta Event (0x3e) plen 12 #240 [hci0] 65.596521
LE Read Remote Used Features (0x04)
Status: Unknown Connection Identifier (0x02)
Handle: 70
Features: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
HCI Event: Command Status (0x0f) plen 4 #241 [hci0] 65.597513
NOP (0x00|0x0000) ncmd 1
Status: Success (0x00)
< HCI Command: LE Set Random Addr.. (0x08|0x0005) plen 6 #242 [hci0] 65.643039
Address: 15:F4:3C:8F:A5:0A (Non-Resolvable)
HCI Event: Command Complete (0x0e) plen 4 #243 [hci0] 65.644538
LE Set Random Address (0x08|0x0005) ncmd 1
Status: Success (0x00)
< HCI Command: LE Set Scan Parame.. (0x08|0x000b) plen 7 #244 [hci0] 65.644689
Type: Active (0x01)
Interval: 22.500 msec (0x0024)
Window: 11.250 msec (0x0012)
Own address type: Random (0x01)
Filter policy: Accept all advertisement (0x00)
HCI Event: Command Complete (0x0e) plen 4 #245 [hci0] 65.646525
LE Set Scan Parameters (0x08|0x000b) ncmd 1
Status: Success (0x00)
< HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 #246 [hci0] 65.646657
Scanning: Enabled (0x01)
Filter duplicates: Enabled (0x01)
HCI Event: Command Complete (0x0e) plen 4 #247 [hci0] 65.648526
LE Set Scan Enable (0x08|0x000c) ncmd 1
Status: Success (0x00)
@ MGMT Event: Command Complete (0x0001) plen 4 {0x0001} [hci0] 65.648675
Start Service Discovery (0x003a) plen 1
Status: Success (0x00)
Address type: 0x07
BR/EDR
LE Public
LE Random
@ MGMT Event: Discovering (0x0013) plen 2 {0x0001} [hci0] 65.648694
Address type: 0x07
BR/EDR
LE Public
LE Random
Discovery: Enabled (0x01)
@ MGMT Event: Discovering (0x0013) plen 2 {0x0002} [hci0] 65.648694
Address type: 0x07
BR/EDR
LE Public
LE Random
Discovery: Enabled (0x01)
@ MGMT Command: Remove Device (0x0034) plen 7 {0x0001} [hci0] 65.648872
BR/EDR Address: C0:E4:80:CA:A3:F0 (OUI C0-E4-80)
@ MGMT Event: Device Removed (0x001b) plen 7 {0x0002} [hci0] 65.648908
BR/EDR Address: C0:E4:80:CA:A3:F0 (OUI C0-E4-80)
@ MGMT Event: Command Complete (0x0001) plen 10 {0x0001} [hci0] 65.648916
Remove Device (0x0034) plen 7
Status: Success (0x00)
BR/EDR Address: C0:E4:80:CA:A3:F0 (OUI C0-E4-80)
< HCI Command: Write Scan Enable (0x03|0x001a) plen 1 #248 [hci0] 65.648955
Scan enable: No Scans (0x00)
@ MGMT Command: Unpair Device (0x001b) plen 8 {0x0001} [hci0] 65.649017
LE Address: C0:E4:80:CA:A3:F0 (Static)
Disconnect: Enabled (0x01)
@ MGMT Event: Command Complete (0x0001) plen 10 {0x0001} [hci0] 65.649031
Unpair Device (0x001b) plen 7
Status: Success (0x00)
LE Address: C0:E4:80:CA:A3:F0 (Static)
@ MGMT Event: Device Unpaired (0x0016) plen 7 {0x0002} [hci0] 65.649034
LE Address: C0:E4:80:CA:A3:F0 (Static)
HCI Event: Command Complete (0x0e) plen 4 #249 [hci0] 65.653515
Write Scan Enable (0x03|0x001a) ncmd 1
Status: Success (0x00)

---

Therefore one has to redo the whole pairing process over and over again.
This is untolerable and there's no workaround for this.

Unfortunately there isnt any output on this node available, what makes it even "more fun".

how ever we need help on this pleaseeather way with an bug fix or main.conf or /sys/kernel/debug/bluetooth/hci0 - settings please.
availaible are:
6lowpan force_sc_support random_address
adv_channel_map force_static_address rpa_timeout
auto_accept_delay hci_revision sc_only_mode
blacklist hci_version sniff_max_interval
conn_info_max_age identity sniff_min_interval
conn_info_min_age identity_resolving_keys ssp_debug_mode
conn_max_interval idle_timeout static_address
conn_min_interval inquiry_cache uuids
dev_class le_auto_conn voice_setting
discov_interleaved_timeout link_keys white_list
dut_mode long_term_keys white_list_size
features manufacturer

I appreciate your help.

with kind regards

habakuk