MediaRouter BT active audio source id or MAC address

Question

I need the active audio source id or MAC address to compare it with my own list of Bluetooth devices. MediaRouter.getSelectedRoute gives very basic information like the name, type of the device. I see there is a getAddress() API which is hidden in MediaRouter class. Is there any other unique id to identify and compare the BT devices with my own list. Name field is not reliable as there can be multiple devices with same name. Also, Samsung devices can have multiple Bluetooth devices active at the same time. Didn't find any API which can give the correct information.

        val mediaRouter = applicationContext.getSystemService(Context.MEDIA_ROUTER_SERVICE) as MediaRouter
        val selectedRoute = mediaRouter.getSelectedRoute(MediaRouter.ROUTE_TYPE_LIVE_AUDIO)
        Log.e("MainActivity", "route:" + selectedRoute)

Also, tried the below for Samsung devices. This gives the connected device list but not the active device.

 List<BluetoothDevice> a2dpList = bluetoothProfileProxy.getConnectedDevices();