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// Check if a speaker is connected 
if (bluetoothAdapter.getProfileConnectionState(BluetoothHeadset.HEADSET) == BluetoothHeadset.STATE_CONNECTED) 
    sendSpeechToSpeaker()
    sendSpeechToPhone()

val btServiceListener: ServiceListener = object : ServiceListener {
    // used to scan all CONNECTED Bluetooth devices looking for external speakers ...
    override fun onServiceConnected(profile: Int, proxy: BluetoothProfile) {
        if (profile == BluetoothProfile.HEADSET) {
            val connectionStates = intArrayOf(BluetoothProfile.STATE_CONNECTED) 
            // get all connected headsets
            val connectedHeadsetList = proxy.getDevicesMatchingConnectionStates(connectionStates)
            for (connectedHeadset in connectedHeadsetList) {
                // check each headset and check if it is ACTUALLY a headset
                val majorMask = BluetoothClass.Device.Major.UNCATEGORIZED // actually want to use BITMASK but some Fwit declared it private !
                val isHeadset = (connectedHeadset.bluetoothClass?.deviceClass?.and(majorMask) == BluetoothClass.Device.Major.AUDIO_VIDEO)
                if (isHeadset) 
                    sendSpeechToSpeaker()
            bluetoothAdapter.closeProfileProxy(BluetoothProfile.HEADSET, proxy) // here we are finished with the proxy so clear
        override fun onServiceDisconnected(profile: Int) {}
    }

// search the list of connected bluetooth headsets
bluetoothManager = getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
bluetoothAdapter = bluetoothManager.adapter
bluetoothAdapter.getProfileProxy(this, btServiceListener, BluetoothProfile.HEADSET);

private fun routeTTSAudioOutput() {
    // on start and when changes are detected ensure audio is being routed correctly
    val bluetoothA2DPConnected = audioOutputAvailable(AudioDeviceInfo.TYPE_BLUETOOTH_A2DP)
    if (bluetoothA2DPConnected) {
        if (!bluetoothSCOTurnedOn) audioManager.startBluetoothSco()
        audioManager.mode = AudioManager.MODE_IN_CALL
    } else {
        if (bluetoothSCOTurnedOn) audioManager.stopBluetoothSco()
        audioManager.mode = AudioManager.MODE_NORMAL
    audioManager.isSpeakerphoneOn = !bluetoothA2DPConnected
    bluetoothSCOTurnedOn = bluetoothA2DPConnected
    bundleTTS = Bundle()
    bundleTTS.putInt(TextToSpeech.Engine.KEY_PARAM_STREAM, audioManager.mode)
    this.runOnUiThread { bluetoothConnectedImageView.visibility = if (bluetoothA2DPConnected) ImageView.VISIBLE else ImageView.INVISIBLE }
}

private val audioDeviceCallback : AudioDeviceCallback = object : AudioDeviceCallback() {
    override fun onAudioDevicesAdded(addedDevices: Array<out AudioDeviceInfo>?) {
        super.onAudioDevicesAdded(addedDevices)
        routeTTSAudioOutput()

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