Works with Victron Energy ESS
Subscribe to a local MQTT broker and make energy data available on a Modbus server
sml_smartmeter --> MQTT broker --> em24 <-- Victron
Thanks to https://github.com/stephane/libmodbus
apt install libmodbus5 libmodbus-dev
cp em24.service /etc/systemd/system/
systemctl enable em24.service
systemctl start em24.service