How to open your Opel Grandland X garage door without Homelink?

There is an alternative way to open your garage door from your Opel Grandland X without using Homelink, called Android Auto. Your Opel Grandland X is certified by Google to use Android Auto.

 Android Auto is a piece of software that allows your android phone to interface with your  Opel Grandland X ’s built-in entertainment and information system. Android Auto increases convenience and reduces distraction by putting commonly used apps, that would be necessary or especially useful while driving on your car’s infotainment display. By doing so, Android Auto minimizes the need to actually handle your android phone while driving.
Also you will need to buy and install an ismartgate device, a small hardware add-on. The ismartgate needs to be wired to the control board of your existing garage opener and connects to your ismartgate app via Wi-Fi.