iOS frequent reconnections causing problems

[jeffdev3]

I am trying to determine the cause of iOS stopping to reconnect to my nRF peripheral in the background.  I have seen posts from several years back that reconnecting too many times in a short time can cause this:

https://devzone.nordicsemi.com/f/nordic-q-a/26599/ios-phone-can-not-reconnect-device/104625#104625

https://stackoverflow.com/questions/29132352/ios-bluetooth-low-energy-ancs-apparent-3-strikes-and-youre-out

I tried to simulate this condition by advertising at a fast rate at power on and 500ms after the connection event, perform a soft reset.  I can see many reconnections being done but don't see the problem of iOS stopping reconnections after some time.  Is this still a problem with iOS 11+ or is there some other way I can cause this problem to occur quickly?

[Kenneth]

Hi,

What nRF5 SDK and Sxxx softdevice are you using here? Do you have any on-air sniffer log (like nRF Sniffer)?

Best regards,
Kenneth

[jeffdev3]

I am using SDK 11 and SD 4.0.2.  I only have phone logs which show connections stopped in the background and only restarted when the app is restarted by the user.  I don't think there is anything wrong with nRF advertising.  I am trying to find the condition which causes the phone to stop connecting by using nRF test firmware.

[Kenneth]

In general I suggest you try my reply here:
https://devzone.nordicsemi.com/f/nordic-q-a/70910/softdevice-v4-0-2-does-not-send-att-write-response/291304#291304 

I am not aware of any specific issue with iOS no.