Can we do like this in iOS?
1 – Speak from iOS device microphone & listen to External bluetooth connected device like Bluetooth speaker / Airplay to Macbook Air / Mac mini ETC device without any echo.

Here is my current code for reference I can able to connect to External bluetooth connected device like Bluetooth speaker / Airplay to Macbook Air / Mac mini but with echo so could not listen properly.

class Sound {
    
    private var session: AVAudioSession {
        AVAudioSession.sharedInstance()
    }
    private let engine = AVAudioEngine()
    var inputNode: AVAudioInputNode!
    
    init() {
        setupAudioSession()
    }
    
    func setupAudioSession() {
        do {
            try session.setCategory(.playAndRecord,options: [.allowBluetoothA2DP,.allowAirPlay,.duckOthers])
            try session.setActive(true)
        } catch {
            print("Could not configure and activate session. (error)")
        }
    }
    
    func startListening() {
        
        inputNode = engine.inputNode
        
        do {
            try session.setCategory(.playAndRecord, mode: .voicePrompt, options: [.allowBluetoothA2DP,.allowAirPlay,.duckOthers]) // For listening self
            
            try session.setActive(true)
            try inputNode.setVoiceProcessingEnabled(true)
        } catch {
            print("Audio session setup error: (error)")
        }
        
        let format = inputNode.inputFormat(forBus: 0)
        let outputNode = engine.outputNode
        print(outputNode.isVoiceProcessingEnabled)
        
        inputNode.isVoiceProcessingBypassed = false
        inputNode.isVoiceProcessingInputMuted = false

        inputNode.isVoiceProcessingAGCEnabled = true
        engine.connect(inputNode, to: outputNode, format: format)
        do {
            engine.prepare()
            try engine.start()
        } catch {
            print("Audio engine start error: (error)")
        }
    }
}