I thought we were still limited by polling which rendered nest protect useless, or have we moved on and we can have instant notification into smartthings?
Nest manager does poll. That said it sees issues typically within a minute or so.
I’m not sure what useless means. In general multiple clouds and the internet need to be running with ST, and ST is not operating any life saving/threatening services.
Don’t get me wrong, the Nest Manager is a beautiful integration and the dev has done miracles in putting it together. But the limitation on the api’s have made it impossible to make much use of the nest protect integration. There aren’t many options when it comes to smoke alarms which are as nice as the nest protects. I have a few, and it annoys me how locked down they are. If nest opened up the api’s for some of the features like temperature, motion, lights and speaker they would have a must have product every HA enthusiast would buy. I would get one for every single room and hallway and quadruple the number I have in the house.