So I’ve been a bit frustrated with the various bugs in the iOS app. The big advantage it had is it I remotely access openHAB via nginx with basic authentication, and the iOS app will automatically log me through that. Mobile safari won’t remember basic authentication.
Others may have realised this already, but there’s a fairly easy alternative if you set up a client side certificate and load that onto the iphone. Then the iphone can authenticate through to openHAB automatically. You can then save the url onto the home screen and have it almost behave like an app.
This tutorial was very helpful: https://gist.github.com/mtigas/952344