NPE crash in SdlDeviceListener

[spstreckfus]

Bug Report

Crash in SdlDeviceListener.notifyConnection() on line 262. Attempting to call sdlListener.bluetoothTransport.stop() when bluetoothTransport value is null.

Reproduction Steps

Unfortunately unable to reproduce at the moment. This crash came from our Crashlytics logs and has only been observed after moving from 5.2 to 5.3.

OS & Version Information

• Android Version: Seeing this in Android 9, 10, 11, and 12
• SDL Android Version: 5.3
• Testing Against: No tests as this came from Crashlytics logs.

Test Case, Sample Code, and / or Example App

None currently available.

Crash Log

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.smartdevicelink.transport.MultiplexBluetoothTransport.stop()' on a null object reference
       at com.smartdevicelink.transport.utl.SdlDeviceListener$TransportHandler.notifyConnection(SdlDeviceListener.java:262)
       at com.smartdevicelink.transport.utl.SdlDeviceListener$TransportHandler.onPacketRead(SdlDeviceListener.java:223)
       at com.smartdevicelink.transport.utl.SdlDeviceListener$TransportHandler.handleMessage(SdlDeviceListener.java:183)
       at android.os.Handler.dispatchMessage(Handler.java:107)
       at android.os.Looper.loop(Looper.java:237)
       at android.app.ActivityThread.main(ActivityThread.java:8167)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)

[JulianKast]

This will be fixed in our 5.4.0 release this april with #1789