peer_manager_handler: Connection security failed: role: Peripheral, conn_handle: 0x0, procedure: Bonding, error: 136

[panypan]

Hello All,

When I was testing our ble keyboard, there was a problem with the Lenovo tablet connection pairing binding. Please help me, thank you!

1. Ble keyboard is based on sdk15.3: nRF5_SDK_15.3.0_59ac345\examples\ble_peripheral\ble_app_hids_keyboard\pca10040e\s112\arm5_no_packs

2. nrf52810

3. Lenovo: windows10 64bit

4. Issue: At first connect the keyboard with the tablet and pairing and bonding, then click the key to disconnect and delete the pairing bonding information, and then change the MAC address to broadcast. At this time, the tablet can scan to the device. then when i click to connect to the device that will be prompted with the following of error prompt: "peer_manager_handler: Connection security failed: role: Peripheral, conn_handle: 0x0, procedure: Bonding, error: 136". What is the cause of this? Or how to configure a new device to pair with the tablet again?

Thanks！

Pany

[Kenneth]

Do you have any on-air sniffer log?

Regarding step 4: Do you deleted pairing information on peripheral (keyboard) or central (tablet) or both?

Thanks,
Kenneth

[panypan]

Fullscreen Ok_log.txt Download

00> <info> app: HID Keyboard example started.
00> 
00> <info> app:   m_whitelist_peer_cnt 2, MAX_PEERS_WLIST 8
00> 
00> <debug> app: pm_whitelist_get returns 1 addr in whitelist and 1 irk whitelist
00> 
00> <info> app: Fast advertising with whitelist.
00> 
00> <info> app: Connected
00> 
00> <info> peer_manager_handler: Connection secured: role: Peripheral, conn_handle: 0, procedure: Encryption
00> 
00> <debug> nrf_ble_gatt: Peer on connection 0x0 requested an ATT MTU of 525 bytes.
00> 
00> <debug> nrf_ble_gatt: Updating ATT MTU to 23 bytes (desired: 23) on connection 0x0.
00> 
00> <info> app: Disconnected
00> 
00> <info> app: Erase bonds!
00> 
00> <error> peer_manager_handler: Peer deleted successfully: peer_id: 0
00> 
00> <info> peer_manager_handler: All peers deleted.
00> 
00> <info> app: Fast advertising.
00> 
00> <info> app: Connected
00> 
00> <info> peer_manager_handler: Connection secured: role: Peripheral, conn_handle: 0, procedure: Bonding
00> 
00> <info> app: New Bond, add the peer to the whitelist if possible
00> 
00> <info> app:   m_whitelist_peer_cnt 2, MAX_PEERS_WLIST 8
00> 
00> <debug> nrf_ble_gatt: Peer on connection 0x0 requested an ATT MTU of 525 bytes.
00> 
00> <debug> nrf_ble_gatt: Updating ATT MTU to 23 bytes (desired: 23) on connection 0x0.
00> 

Fullscreen NG_log.txt Download

00> <info> app: HID Keyboard example started.
00> 
00> <info> app:   m_whitelist_peer_cnt 1, MAX_PEERS_WLIST 8
00> 
00> <debug> app: pm_whitelist_get returns 0 addr in whitelist and 0 irk whitelist
00> 
00> <info> app: Fast advertising.
00> 
00> <info> app: Connected
00> 
00> <debug> nrf_ble_gatt: Peer on connection 0x0 requested an ATT MTU of 527 bytes.
00> 
00> <debug> nrf_ble_gatt: Updating ATT MTU to 23 bytes (desired: 23) on connection 0x0.
00> 
00> <info> peer_manager_handler: Connection secured: role: Peripheral, conn_handle: 0, procedure: Bonding
00> 
00> <info> app: New Bond, add the peer to the whitelist if possible
00> 
00> <info> app:   m_whitelist_peer_cnt 2, MAX_PEERS_WLIST 8
00> 
00> <info> app: Disconnected
00> 
00> <info> app: Erase bonds!
00> 
00> <error> peer_manager_handler: Peer deleted successfully: peer_id: 0
00> 
00> <info> peer_manager_handler: All peers deleted.
00> 
00> <info> app: Fast advertising.
00> 
00> <info> app: Connected
00> 
00> <debug> nrf_ble_gatt: Peer on connection 0x0 requested a data length of 123 bytes.
00> 
00> <debug> nrf_ble_gatt: Updating data length to 27 on connection 0x0.
00> 
00> <debug> nrf_ble_gatt: Peer on connection 0x0 requested an ATT MTU of 527 bytes.
00> 
00> <debug> nrf_ble_gatt: Updating ATT MTU to 23 bytes (desired: 23) on connection 0x0.
00> 
00> <debug> nrf_ble_gatt: Data length updated to 27 on connection 0x0.
00> 
00> <debug> nrf_ble_gatt: max_rx_octets: 27
00> 
00> <debug> nrf_ble_gatt: max_tx_octets: 27
00> 
00> <debug> nrf_ble_gatt: max_rx_time: 1096
00> 
00> <debug> nrf_ble_gatt: max_tx_time: 1096
00> 
00> <info> peer_manager_handler: Connection security failed: role: Peripheral, conn_handle: 0x0, procedure: Bonding, error: 136
00> 
00> <info> app: Disconnected
00> 

[panypan]

Hi Kenneth,

Thank you for your reply!

I had deleted pairing information on peripheral (keyboard),but not deleted central (tablet).

pany

[Kenneth]

Can you try to allow re-pairing by adding handling of PM_EVT_CONN_SEC_CONFIG_REQ as shown here?
https://devzone.nordicsemi.com/f/nordic-q-a/57979/disable-bonding-and-allow-only-pairing/235212#235212