iOS BLE cannot correctly read the model number.

[Leo Mo]

After updating from SDK V2.1.3 OTA to SDK V2.9.0, iOS cannot correctly read data such as the model number, but Android can read it normally.

Turn off Bluetooth in the system, turn it back on, and it can be read normally after connecting.

[Menon]

Hello,

Can you check whether the device actually restores the bond data and the CCCD when the new firmware boots? Are you seeing a new pairing dialog after the OTA/reboot?

I see that you have enabled CONFIG_BT_SETTINGS=y, but in the application, after enabling Bluetooth, you also need to call settings_load(). This call restores the bonds and CCCDs, see this here.

Try enabling the logs CONFIG_BT_LOG_LEVEL_DBG and CONFIG_SETTINGS_LOG_LEVEL_DBG and check if there are any log messages indicating that CCCD data is being loaded from flash after boot.

Kind regards,
Abhijith

[Leo Mo]

Hi Menon,

I have captured the logs; please see the attachment.

The BLE behavior on iOS and Android is a bit different.

IOS Address: 6C:3A:FF:11:53:B0

[00:00:16.234,741] <dbg> bt_gatt: bt_gatt_connected: conn 0x2000c470
[00:00:16.236,480] <dbg> bt_gatt: ccc_set_direct: key: bt/ccc/6c3aff1153b00
[00:00:16.237,792] <dbg> bt_gatt: ccc_set: Read CCC: handle 0x0004 value 0x0002
[00:00:16.239,074] <dbg> bt_gatt: ccc_set: Read CCC: handle 0x0026 value 0x0001
[00:00:16.240,356] <dbg> bt_gatt: ccc_load: Restoring CCC: handle 0x0004 value 0x0002
[00:00:16.241,851] <dbg> bt_gatt: ccc_load: Unable to restore CCC: handle 0x0026 cannot be found
[00:00:16.243,621] <dbg> bt_gatt: ccc_set: Restored CCC for id:0 addr:6C:3A:FF:11:53:B0 (public)
[00:00:16.248,321] <dbg> bt_gatt: gatt_ccc_changed: ccc 0x20002724 value 0x0002
[00:00:16.249,664] <dbg> bt_gatt: find_sc_cfg: id: 0, addr: 6C:3A:FF:11:53:B0 (public)
[00:00:16.251,068] <dbg> bt_gatt: sc_restore: no SC data found
[00:00:16.252,166] <dbg> bt_att: bt_att_status: chan 0x20027084 status 0x20027094
[00:00:16.272,857] <dbg> bt_att: bt_att_recv: Received ATT chan 0x20027080 code 0x1d len 6
[00:00:16.274,291] <dbg> bt_att: att_indicate: chan 0x20027080 handle 0x0008
[00:00:16.275,512] <dbg> bt_gatt: bt_gatt_notification: handle 0x0008 length 4
[00:00:16.276,855] <dbg> bt_att: chan_send: code 0x1e
[00:00:16.277,832] <dbg> bt_att: att_tx_destroy: 0x200367b0
[00:00:16.278,808] <dbg> bt_att: att_on_sent_cb: opcode 0x1e
[00:00:16.279,815] <dbg> bt_att: att_on_sent_cb: UATT bearer, calling att_sent
[00:00:16.281,066] <dbg> bt_att: att_sent: conn 0x2000c470 chan 0x20027084
[00:00:16.282,257] <dbg> bt_att: bt_att_sent: chan 0x20027080
[00:00:16.512,908] <dbg> bt_att: bt_att_encrypt_change: chan 0x20027084 conn 0x2000c470 handle 16 sec_level 0x02 status 0x00 
[00:00:16.514,801] <dbg> bt_gatt: bt_gatt_encrypt_change: conn 0x2000c470
[00:00:16.516,082] <dbg> bt_gatt: gatt_ccc_changed: ccc 0x20002724 value 0x0002
[00:00:16.517,395] <dbg> bt_gatt: find_sc_cfg: id: 0, addr: 6C:3A:FF:11:53:B0 (public)
[00:00:16.518,798] <dbg> bt_gatt: sc_restore: no SC data found

Android Address: F0:05:1B:64:F7:C0

[00:00:20.023,956] <dbg> bt_gatt: bt_gatt_connected: conn 0x2000c540
[00:00:20.026,550] <dbg> bt_gatt: ccc_set_direct: key: bt/ccc/f0051b64f7c00
[00:00:20.027,832] <dbg> bt_gatt: ccc_set: Read CCC: handle 0x0004 value 0x0002
[00:00:20.029,174] <dbg> bt_gatt: ccc_set: Read CCC: handle 0x0026 value 0x0001
[00:00:20.030,639] <dbg> bt_gatt: ccc_set: Read CCC: handle 0x002c value 0x0001
[00:00:20.031,921] <dbg> bt_gatt: ccc_load: Restoring CCC: handle 0x0004 value 0x0002
[00:00:20.033,386] <dbg> bt_gatt: ccc_load: Unable to restore CCC: handle 0x0026 cannot be found
[00:00:20.034,942] <dbg> bt_gatt: ccc_load: Unable to restore CCC: handle 0x002c cannot be found
[00:00:20.036,529] <dbg> bt_gatt: ccc_set: Restored CCC for id:0 addr:F0:05:1B:64:F7:C0 (public)
[00:00:20.040,863] <dbg> bt_gatt: gatt_ccc_changed: ccc 0x20002724 value 0x0002
[00:00:20.042,205] <dbg> bt_gatt: find_sc_cfg: id: 0, addr: F0:05:1B:64:F7:C0 (public)
[00:00:20.043,609] <dbg> bt_gatt: sc_restore: peer F0:05:1B:64:F7:C0 (public) start 0x0001 end 0xffff

BT-log-INF.txt