A:Answer You don't need internet, you just need wifi. You can have an in home network without any outside internet access.
That said, I believe you just need wifi for bot to communicate with your app and to have a smarter way to connect and control the bot, like scheduling, adding nogo lines on the floorplan etc.... Without the app, I think all you have to do is hit the button on top and it will still run in the room it is located in.