Apple's Wi-Fi Aware demo shows that pairing is required before establishing a connection. Is this pairing mandatory? Can Android devices pair with Apple devices? My Android device strictly supports Wi-Fi Aware 4.0 and I want to achieve interoperability with Apple devices.

The app is an official Apple app: https://developer.apple.com/documentation/wifiaware/building-peer-to-peer-apps. I have two phones, an iPhone 12 and an iPhone 13, both with Bluetooth turned on and connected to the same WiFi. The devices paired successfully the first time, but after I reset the Wi-Fi identifier in Settings - Privacy & Security - Paired Devices, the devices could no longer pair. Specifically, one device displays a PIN input pop-up, but the other device does not show the PIN. What could be the reason for this?

At WWDC 25, Dr. Swetank mentioned, “DeviceDiscoveryUI is for making connections between apps and from an app to another device. It supports pairing with both Apple and third-party devices.” I find the pairing process in DeviceDiscoveryUI via Wi-Fi Aware intriguing. I have two questions: Can we pair devices via Bluetooth first and then establish a Wi-Fi Aware connection? If I use DeviceDiscoveryUI, how should I write an Android program to correspond with it and achieve iPhone-Android pairing? The app is an official Apple app: https://developer.apple.com/documentation/wifiaware/building-peer-to-peer-apps.