ESP32 BLE device not discoverable on iOS 18.x but works on Android/Windows

[Oblivious0214]

I have an ESP32 device using nimble-cpp-2.3.0 component for BLE advertising. The device can be discovered by Android and Windows systems, but cannot be found by newer iOS versions (18.x).

However, when I use a third-party app called "BLE Debug Assistant", it can discover the device. After connecting and disconnecting once through this app, the iOS system can then also discover the device.

Is this a compatibility issue between nimble-cpp and newer iOS versions? Or could it be because I'm using custom UUIDs and device names that iOS treats as unknown devices?

BLE Debug Assistant https://apps.apple.com/cn/app/%E8%93%9D%E7%89%99%E8%B0%83%E8%AF%95%E5%8A%A9%E6%89%8B/id1536579599

[h2zero]

iOS doesn't show BLE devices that it has not paired with already, this has always been that way. Using an app is the only way to scan and connect to BLE only devices.