Integrates directly with Andrew Shillidays garage door webapp (https://github.com/andrewshilliday/garage-door-controller), allowing you to monitor and control your Raspberry Pi garage door controller directly from your mobile using this app. Simply configure the app with the credentials you normally use to connect to the garage door webapp.
For external access over the Internet, you should correctly port forward the webapp on your home router/gateway. You will also need to setup a dynamic DNS (unless you have a static IP from your ISP) after which you will be able to connect to your garage door webapp over the Internet.