Once you have synced Google Assistant with your HOMYHUB (from Settings > Voice Assistants > Google Assistant):
1.- Create a Google Routine which will allow you to open as many doors simultaneously as you want, and even create an opening delay between doors if you require it, that is, when you ask the assistant “open all my doors”, it will open the first one and after “X” seconds the next one.
2.- Add a voice trigger to ask the assistant to open all the doors you want simultaneously (e.g. “Open all my doors”)
3.- Then add an action. Here It is key that the text of the action is: “open device + exact name of your door”(e.g. “Open main door device”) You must create an action for each of your doors, and if you want to set an opening delay between your doors, this is the time.
4.- Finally, just click save, and that's it!
This way, the next time you give the assistant the words you've set for the trigger ("open all my doors"), it will open your doors simultaneously. Ta-da! 🧙♂️ Just like magic.
Once this is done, If you would also like to have a button on your car's dashboard with Android Auto that by pressing it on your screen opens all your doors, just go to Settings > Connect with... > Andriod Auto > Follow the instructions to link HOMYHUB with your car screen, and add the "open all my doors" button.