We also have a display and also do pairing. You have to press a physical button the device which results in a 4 digit code on the display that has to be entere

We also have a display and also do pairing. You have to press a physical button the device which results in a 4 digit code on the display that has to be entered in the browser or app (somewhat analogous to bluetooth pairing). At the end of the day this results in a cookie being set. But the traffic is still over http.