Today "Airplanes, Etc." 184.108.40.20650212 was released. The reason for the release was to update the Bluetooth Duelling functions. It was the case that when you played the Bluetooth version of the game once, and chose to play from one side of the screen, you could not simply choose to play the other side of the screen without stopping the game and toggling bluetooth off and on.
Now when you play the bluetooth version, the game connects with bluetooth once and then allows you to play over and over again on the same original connection. This way you can re-match your opponent over and over and even switch which side you start on.
You do need to reconnect if you choose a different opponent, but otherwise your first connection is reused over and over.