Compatibility with MUZ-FE18NA (outdoor unit) and MSZ-FE18NA (indoor unit)

[jontires]

I've been running 2 of these for about 4 weeks on ESP8266s and getting good results that are consistent and stable.
These are older, single headed units and the following sensors work fine:

1. Stage sensor
2. Sub mode sensor
3. Auto sub mode sensor
4. Compressor frequency
5. Room Temperature (from indoor unit or remote source)

The following sensors are not supported by this model:

1. Outside air temperature
2. Runtime hours
3. Input power
4. Energy Usage

I've observed from my other unit that supports Input power, that the compressor frequency graph and the input power graph track very closely, to the extent that I wonder if a computed input power sensor could be derived from the compressor frequency for those units that don't natively provide input power readings.