I've currently received a task that requires to evaluate the possibility, as title, of recording via mic on BLE headset and play sound via built-in speaker at same time on iOS.
I've done implementing forcing audio device set to built-in speaker whenever the BLE headset is connected/disconnected. It works if both mic/speaker need to be set to built-in one. But after days of search and try, I found that it is not possible to make mic/speaker set separately. Even specifying input device on AVAudioEngine is supported only on MacOS, not iOS.
Can anyone or any technician give me a persuading answer about "Possibility of record via mic on BLE headset and play sound via built-in speaker at same time"?