RN8209 energy sensor support with watt, voltage and current. (#1337)

Co-authored-by: h2zero <powellperalta@gmail.com>

platformio.ini

@@ -141,6 +141,7 @@ gfSunInverter = https://github.com/BlackSmith/GFSunInverter.git#v1.0.1
 decoder = https://github.com/theengs/decoder.git#v0.9.7
 ssd1306 = thingpulse/ESP8266 and ESP32 OLED driver for SSD1306 displays@^4.3.0
 lm75 = jeremycole/I2C Temperature Sensors derived from the LM75@^1.0.3
+rn8209 = https://github.com/theengs/RN8209C-SDK.git#arduino
 
 [env]
 framework = arduino
@@ -265,6 +266,7 @@ lib_deps =
   ${libraries.dallastemperature}
   ${libraries.rfWeatherStation}
   ${libraries.shtc3}
+  ${libraries.rn8209}
 build_flags =
   ${com-esp.build_flags}
   '-DZgatewayRF="RF"'
@@ -289,6 +291,7 @@ build_flags =
   '-DZgatewayRFM69="RFM69"'
   '-DZsensorGPIOInput="GPIOInput"'
   '-DZsensorGPIOKeyCode="GPIOKeyCode"'
+  '-DZsensorRN8209="RN8209"'
   '-DZgatewayWeatherStation="WeatherStation"'
   '-DsimplePublishing=true'
   '-DWM_PWD_FROM_MAC=true'