iPhone11 + iOS13.1.2 cannot connect to nRF52832 based IoT device

[Graham Deng]

iPhone11 + iOS13.1.2 cannot connect to nRF52832 based IoT device when application is running in background. iPhoneX + iOS13.1.2 can connect without problem. Does anybody tested nRF52832 with iPhone11? Does iPhone11 changed scan_interval, scan_window for background application and won't active scan any more?

[awneil]

Can it connect to any other BLE device(s) ?

Can it connect when not running in background?

[Graham Deng]

Yes, it can connect to iPhoneX + iOS13.1.2 when app is running in background. Other Android phone are also fine. We cannot find information on what BLE dual mode chip is used in iPhone11 (assuming it is BCM43xx) and what stack firmware is used. When Nordic develop BLE chipset, do you perform interoperability test before release other than SIG UPFs? Could you have test team test on iPhone?

[awneil]

By "it" I meant "the iPhone11 + iOS13.1.2": 

Can the iPhone11 + iOS13.1.2 connect to any other BLE device(s) ?

Can the iPhone11 + iOS13.1.2 connect when not running in background?