Most of the mFi sensors are able to reasonably provide accurate
readings to a tenth of a unit or so. This patch rounds them for
better display in the UI. Normally, I would expect this to be a view
action instead of altering the actual data emitted, but since these
values are reasonable for sensor precision, we're not really losing
anything. I followed the model from the openweathermap component, which
rounds for readability in the backend.
When we update the mFi server for the state of a switch, the new
state is not always reported immediately if we update right after
the action (the server is not RESTful).
This patch adds some internal target-state handling to report the
desired state on the next poll, allowing any subsequent polls to
override that state.
Also, bump the version requirement for mficlient to 0.2.2 to absorb
a bug fix.
