@didek @abloo
With or without IPv6, your vacuum is not gonna have it's own public IP. That's not gonna happen. Ever. ISPs will not give you another new IP whenever you buy yourself a new device. Not to mention that IoT manufacturers don't like giving you easy control to things. They want you making an account for their products, and logging everything in to their website.

Even with IPv6, things are gonna be just like they are now: ISPs will give you exactly 1 public IPv6 address. Your home network gives your devices either IPv6 or IPv4 local addresses, and all your IoT smart devices log in to a remote server via phone app.