https://github.com/greentangerine/ME3000/blob/master/me3000.py
https://github.com/basking-in-the-sun2000/solar-logger
https://secondlifestorage.com/index.php?threads/limiter-inverter-with-rs485-load-setting.7631/page-4
https://www.instructables.com/How-to-Use-Modbus-With-Arduino/