I'm very interested to know what board you're using at the moment. I did consider using a button, however given the small size I wanted the board to be, it was not possible to have anything mechanical on it.

1. The protocol is actually fairly simple and open. Everything including the website is open source. In fact the site is a single page HTML which can be saved and opened offline.

2. The point about sabotaging which others have mentioned, is a valid point and I have thought about using a sort of a password to restrict who can configure it. I haven't found a user-friendly solution to this yet. As this board is meant to be embedded inside of an enclosure, I am relying on physical obstruction of the sensor as a form of security.