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.

[Ars Morozov]

But anyway as I can see it work fine, at least I can discover services and characteristics. For now I have only READ characterisits, and I can succefully read it.

Anyway I think we should find the source that cause this error message.

[Spirit]

Ars Morozov is not an Android or an Iphone related problem.
It happens randomly without a specific procedure or rule, with both phones. 
And that's why it's so hard to debug.

As I said... I only migrate my project to new SDK. With the SDK15 I did not have these problems.

[Ars Morozov]

It's not completely random, because I try to do it many times it and this problem is occure with this conditions. Maybe it's related with device.

[Einar Thorsrud]

How often do you see this issue? Do you do anything particular to trigger it?

[Ars Morozov]

Always when I connect through this device. I will try to connect from different iPhones and Androids to collect more statistic. I will write about it here..