Connection security failed: role: Central in ble_app_rscs_c

[HSh]

Hello,

I am working on nRF52840 DK with nRF5_SDK_15.2.0_9412b96 and I used the example ble_app_rscs_c with absolutely no changes. I first erased the flash and then burned the Softdevice and app to erase any bonding. I used LightBlue on my iPhone to advertise 0x1814 (BLE_UUID_RUNNING_SPEED_AND_CADENCE). The first time I received the pairing request on iPhone. Every time I restart the DK, I receive the following error several times (4 to 5 times):

<info> peer_manager_handler: Connection security failed: role: Central, conn_handle: 0x0, procedure: Encryption, error: 4352

and then

<info> peer_manager_handler: Connection secured: role: Central, conn_handle: 0, procedure: Encryption.

Although it finally works, these failures cause a long delay.  I have also seen this problem reported for BLE peripheral examples but their solution (un-pairing from iPhone) does not work for me. I need to keep the devices paired.

I was wondering how I can fix this.

Thanks,

[Jan Van Moer]

Hi,

I have a similar issue, I'm using the ble_app_multirole_lesc example for nRF5_SDK_15.2.0_9412b96.
I have erased 2 dev kits and placed the example on both.

When they try to connect I end up with this error:

<info> app: CENTRAL: Already connected to this device as PERIPHERAL (handle: 0), disconnecting.
<info> peer_manager_handler: Connection security failed: role: Central, conn_handle: 0x0, procedure: Encryption, error: 4352
<warning> peer_manager_handler: Disconnecting conn_handle 0.
<info> app: CENTRAL: Disconnected, handle: 0, reason: 0x16

And the other one:

<info> app: PERIPHERAL: Already connected to this device as CENTRAL (handle: 1), disconnecting.
<info> app: PERIPHERAL: Disconnected, handle 1, reason 0x13.

I'm not able to have a connection and receive heart rate data. Any clue what can go wrong ?

Regards,

Jan

[Mttrinh]

Hi,

I managed to reproduce the issue and have reported this internally. I will update this case when we find the cause of this issue.

[HSh]

Hello Mttrinh, I was wondering if you have any update for me.