Strange Bonding / Security behavior - Cannot Bond in "normal" way

[gos]

Hello,

Using two nrf52 Dev Kit boards for Central / Peripheral.
Using Softdevice S132, , peer manager and Segger on Win7.

I have modified ble_uart_and ble_uart_c using ble_app_hrs and ble_app_hrs_c.

My program works, but will normally not bond when I use SEC_OPEN in the nus_service.

Now to the strange part: If I run ble_app_hrs and using ble_app_hrs_c first , and then run ble_uart_and ble_uart_c (on the same respective boards) my program bonds.

I can then even set SEC_JUST_WORKS in the nus service. The following is part of my Debug transcript:

and my peer manager event handler then shows the following Log Info (that I have added):

<info> app: NRF_BLE_SCAN_EVT_WHITELIST_ADV_REPORT
<info> app: NRF_BLE_SCAN_EVT_CONNECTED
<info> app: ----> pm_evt_handler called
<info> app: Connected to a previously bonded device.
<info> app: ----> pm_evt_handler called
<info> app: --> Connection Count = 1
<info> app: ----> pm_evt_handler called
<info> app: ----> pm_evt_handler called
<info> app: ----> pm_evt_handler called
<info> app: Data length for connection 0x0 updated to 251.
<info> app: GATT ATT MTU on connection 0x0 changed to 247.
<info> app: Ble NUS max data length set to 0xF4(244)
<info> app: ----> pm_evt_handler called
<info> app: Connection secured: role: 2, conn_handle: 0x0, procedure: 0.
<info> app: Data length for connection 0x0 updated to 251.
<info> app: ---> Discovery complete:
<info> app: Connected to device with Nordic UART Service.
<info> app: Number of Bounded Peers = 1
<info> app: data_len = 8
<info> app: Received Peripheral Temperature: 23.34 C
<info> app: Received Peripheral Humidity: 38.76 %

I have copied sdk_config.h from ble_app_hrs and ble_app_hrs_c into ble_uart_and ble_uart_c to make sure no settings are different there.

I have also copied all project settings from ble_app_hrs and ble_app_hrs_c to ble_uart_and ble_uart_c including the common>> preprocessor settings.

However, if i erase the ram of both dev boards, and run again, the program runs, but with no security or bonding!

Please help, I have used several days to figure this out but are completely lost now...

[gos]

Solved it....

Combining app_uart with app_hrs I had overlooked the simple one line call in idle_state_handle() in both Central & Peripheral:

nrf_ble_lesc_request_handler();    // !!!

Now Pairing & Bonding works both with SEC_OPEN and SEC_JUST_WORKS set in the Peripheral nus Service!

Nothing like self served support! :-)