Does the mobile app use 3rd party services to relay information?

Hi,

I took my home assistant laptop to a friend, where I connected the laptop to his wireless, in the meanwhile, I’ve got a notification on my phone (which was not connected to my friends wifi), how is that possible? I didn’t open any firewall port (while duckduck dns was actually working)…

So does the notification data is being sent to a 3rd party service?

thanks

Firebase cloud messaging.

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