This project contains code for a project of mine, where I remotely control a garage door from my phone using Google Cloud Messaging (GCM), which is now Firebase Cloud Messagaing (FCM).
You can find more details here: http://www.jpuderer.net/2017/01/my-garage-door-is-now-part-of-internet.html
This project contains both the Android application source, and a script that runs on a Raspberry Pi that receices the commands.
Apache Licence Version 2.0 http://www.apache.org/licenses/