NRF52832: The app is repeatedly disconnected after the Apple phone is paired with the DFU

[zimo]

Here is my advertising interval and connection parameter configuration(SDK15.0.0 softdevice6.0.0) :

[zimo]

Hi,

 Actually, this is not related to DFU.

 First, I download softdevice and ANCS (without bootloader). Then I just use keil to download and run only app about ANCS.

 The next step is to search for and connect to the bluetooth device via my phone app.

 Finally, do the following.

Operation flow:

       1. First connect bluetooth and pair.

       2. Turn off the Apple phone system Bluetooth and then open.

This time the automatic connection will be repeated and automatically disconnected.

[zimo]

I tested this because our project have this problem right now.

[Hung Bui]

I don't see any problem in your log, could you point me to where in the log showing it's disconnecting and connecting again ? Please post the full log. 

Please try to test with unmodified version of the ANCS (suggest to test with the precompiled hex). 

As sniffer trace would greatly help.