The portable EVSE that comes with the truck does not require WiFi (it doesn't even support it).Congrats on bringing your baby home! One question, we need wifi for the charger??? In my idiot mind, I was just thinking we needed electrical power to "feed" the truck. I can almost guarantee my wifi signal from my house does not penetrate far enough into my garage with enough strength. Hell, I can barely get signal down in my basement.
The Rivian Wall EVSE (purchased separately) does require WiFi.
If you don't have WiFi in your garage, and don't want to add it, then I wouldn't get the Rivian Wall EVSE. You can use the portable EVSE, or another brand of hardwired EVSE that doesn't have "smart" features.