Add ability to use SDL listener if BT device==null

Author: joeygrover

android/sdl_android/src/main/java/com/smartdevicelink/transport/utl/SdlDeviceListener.java

@@ -61,7 +61,7 @@ public class SdlDeviceListener {
 
     private final WeakReference<Context> contextWeakReference;
     private final Callback callback;
-    private final BluetoothDevice connectedDevice;
+    private BluetoothDevice connectedDevice;
     private MultiplexBluetoothTransport bluetoothTransport;
     private TransportHandler bluetoothHandler;
     private Handler timeoutHandler;
@@ -87,24 +87,21 @@ public SdlDeviceListener(Context context, BluetoothDevice device, Callback callb
     public void start() {
         if (connectedDevice == null) {
             DebugTool.logInfo(TAG, ": No supplied bluetooth device");
-            if (callback != null) {
-                callback.onTransportError(null);
-            }
-            return;
-        }
-
-        if (hasSDLConnected(contextWeakReference.get(), connectedDevice.getAddress())) {
+        } else if (hasSDLConnected(contextWeakReference.get(), connectedDevice.getAddress())) {
             DebugTool.logInfo(TAG, ": Confirmed SDL device, should start router service");
             //This device has connected to SDL previously, it is ok to start the RS right now
             callback.onTransportConnected(contextWeakReference.get(), connectedDevice);
             return;
         }
+
         synchronized (RUNNING_LOCK) {
             isRunning = true;
             // set timeout = if first time seeing BT device, 30s, if not 15s
-            int timeout = isFirstStatusCheck(connectedDevice.getAddress()) ? 30000 : 15000;
+            int timeout = connectedDevice != null && isFirstStatusCheck(connectedDevice.getAddress()) ? 30000 : 15000;
             //Set our preference as false for this device for now
-            setSDLConnectedStatus(contextWeakReference.get(), connectedDevice.getAddress(), false);
+            if(connectedDevice != null) {
+                setSDLConnectedStatus(contextWeakReference.get(), connectedDevice.getAddress(), false);
+            }
             bluetoothHandler = new TransportHandler(this);
             bluetoothTransport = new MultiplexBluetoothTransport(bluetoothHandler);
             bluetoothTransport.start();
@@ -155,6 +152,9 @@ public void handleMessage(@NonNull Message msg) {
                 case SdlRouterService.MESSAGE_STATE_CHANGE:
                     switch (msg.arg1) {
                         case MultiplexBaseTransport.STATE_CONNECTED:
+                            if(sdlListener.connectedDevice == null) {
+                                sdlListener.connectedDevice = sdlListener.bluetoothTransport.getConnectedDevice();
+                            }
                             sdlListener.setSDLConnectedStatus(sdlListener.contextWeakReference.get(), sdlListener.connectedDevice.getAddress(), true);
                             boolean keepConnectionOpen = sdlListener.callback.onTransportConnected(sdlListener.contextWeakReference.get(), sdlListener.connectedDevice);
                             if (!keepConnectionOpen) {