error PM_EVT_CONN_SEC_FAILED on a peripherial side

[Mikhail]

Hi!

I use SDK15.0 on a central side with nrf52832 with bonding and work with whitelist.

On the peripherial side I use nrf52810.

All works fine, all bonded and work with this bonded device. All connected fine. But always when attempt to connect central to my bonded peripherial, always, first on the peripherial side I get PM_EVT_CONN_SEC_FAILED case, where I make 

sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);

After that I get bonded connect success. Possible 2-3 times error case PM_EVT_CONN_SEC_FAILED , after that I have also stable bonded connect.

Why this case occurs? How possible to fix it?

[Mikhail]

When error PM_EVT_CONN_SEC_FAILED occurs, I have inside error

PM_CONN_SEC_ERROR_PIN_OR_KEY_MISSING

Really bonded key missed? Why after next reconnect this key finded and work? And connect establish?

[Simon]

Check out this case, where a customer had a similar problems as yours. In the customers case the bond data wasn't stored correctly, could you check out this comment from the customer?

"The write_execute() function calls sd_flash_write() which returns NRF_SUCCESS, but the soft device doesn't generate an event"

Could you check out if this is the case for you?

Best regards,

Simon

[Mikhail]

Hi!

Yes, the peer manager has incorrect stored key. After rebond, this problem gone.