Handle time going backwards, and net consumption never going decreasing #11
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If a solar customer is not yet on _net metering_, then the kWh_net Sensor will never decrease (i.e., meter does _not_ run backwards). This means that kWh_returned will always be zero, even though power _is_ flowing back to the grid (though the customer is not being credited for it). For visualizing in e.g. Home Assistant's Energy dashboard, we therefore export the Watts flowing in either direction (to or from the grid) so that integral helpers/sensors/entities can be used to show the _actual_ energy flow to and from the grid (again, even though the customer is not being credited (yet?) on the meter / bill).
jgruen
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On my meter, kWh net never decreases. However, Watts does go negative. This PR adds sensors that can be integrated in Home Assistant to make net metering make sense.
Furthermore, if using e.g. https://esphome.io/components/time/homeassistant.html, time can jump backwards, which breaks communication with the meter. This PR adds sanity checks to
next_variable(s)