This project uses the ESP8266 NODEMCU and sockets for communication. UDP packets are sent when the user presses the trigger button to fire or holds the other button to walk. Movement occurs in the direction the camera is facing.
I will be posting the .stl files for 3D printing a more user friendly version of the gun soon, as well as making the tracker smaller and making a better game.
Full instructions can be found here: http://www.instructables.com/id/The-Oculus-Cardboard-Project-DIY-Virtual-Reality-G/