Emulates the basic MATE interface for the FM 80/60 series of Charge Controllers by OutBack Power. 9600 bps 9N1 with opto-isolation.

The starting point and store of priceless information was here.
https://github.com/jorticus/pymate   

This is the production version of the project. Tracks battery energy using data from the FM80 and a AC power meter connected via MODBUS, the EM500. The CAN-FD bus uploads data to remote displays and to a Linux server program
that converts that data to JSON format for remote MQTT access.