BLE_APP_TEMPLATE connection ecryption error in SDK 15.1

[Ars Morozov]

Hello. I've migrated my application from SDK 14.2 to 15.1 and I obtain this strange message from peer_manager_handler in my log: 

<info> peer_manager_handler: Connection security failed: role: Peripheral, conn_handle: 0x0, procedure: Encryption, error: 4102

I obtain this message only when I connect with nRF_Connect app on Iphone. When I connect with Android everything is fine.


My application is based on ble_app_template. So, I upload clean ble_app_template from SDK 15.1 and still obtain this message. When I check it on ble_app_template from SDK 14.2, message is disapear.

What does this message mean? And have can I deal with it?

[Einar Thorsrud]

Hi,

I have not been able to reproduce this on my side using an unmodified Template Application from SDK 15.1 and nRF Connect 1.8.7 on iOS. Can you elaborate on how you were able to trigger his issue, and describe any modifications you have done to the Template Application?

[Ars Morozov]

I just upload template application on nRF52DK (pca10040) without any modifications of project and connect with nRF Connect 1.8.7 on iOS (iPhone 6). 
When I connect with Android this message is disapear.

[Einar Thorsrud]

Spirit: It does not look like you are seeing the same issue as Ars Morozov. According to the API documentation for  sd_ble_gap_sec_info_reply() you get NRF_ERROR_INVALID_STATE in the following situations:

• No link has been established.
• No BLE_GAP_EVT_SEC_REQUEST pending.
• LE long term key requested command not allowed.

Are you also using a modified template application? Can you upload the full log leading up to this error? Any other information?

[Spirit]

Einar,

Yes, I saw the API.
I'm not using any template. I only migrate my project to the new SDK15.1. On SDK15 I do not have this problem.
Therefore, "nothing" is new, "only" the SDK  

[Ars Morozov]

Thank you very much!

[Einar Thorsrud]

Spirit: Can you create a new question so that we can continue there? It is cleaner to keep unrelated issues in separate threads. In that question, can you upload any additional information you have (logs, sniffer traces, code etc.)?

[Bugo]

To give further instructions about this since this helped me with my iPhone, "removing the bond" in my case meant going to Settings => Bluetooth, and looking for my nRF Device. Then go to "Forget this device". I also turned off Bluetooth afterwards just in case and re-enabled it. That Connection Security Failed message went away. Maybe just "Forgetting the device" is enough, haven't tried it.