This is meant to grow to accommodate all kinds of temp sensors. They have a small base class,
where most of the common functions like temp, humidity etc, are sensor specific.
Main function here is the capture function. All attrs are currently fixed.
The server fetches the saved image, in order to not have read/write conflict we first save captured image as 'assets/foo.jpg' and after capture rename it to 'assets/capture.jpg'.
