IOS exception disconnect after 90s when change ble connection interval on NRF52810

[Ian715]

Hi Nordic Forum!

        In the past, I set connection interval min to max is 20ms~75ms, it work ok for IOS。But on Android platform, Android use 75ms as actual connection interval. It is too long for us. We need change connection interval to reduce delay. So we try set connection interval to 15ms~30ms、15ms~15ms、20ms~30ms and so on，but  use all these param , connection will disconnect after about 90s for iOS.

I referennce the Apple develop guidlines section 23.6（https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf）。

Follow that，the connection interval range15ms~15ms、15ms~30ms is ok。I don't know why occur exception disconnect on IOS platform.

What value should I set to connection interval ensure work on IOS.

[Ian715]

IOS report error code is 0, the error message is "Unknown". Many your customers have occured this problem. more detail can reference this link(https://forums.developer.apple.com/thread/90929), our problem is same to it.