It would be excellent and extremely useful if your cloud based server could collect and log information from the 'SmartStat' - either by regular (~15mins ?) polling from your server out to the 'SmartStat', or by the 'SmartStat' regularly connecting out to your server.
Information on current temperature and if the boiler is currently calling for heat could then be logged over time and made available to the user via a web interface or mobile app,
You could even decide to charge a small annual fee for providing this additional service.
It would be nice to be able to use the Android app to select whether
to use the internal temperature sensor or the remote probe.
This feature would be useful where the App is used to control a SmartStat
in a remote property.