Hi,
i have developed a small soft to read from electricity meter used in germany with rj45 connection and convert and send to mqtt server, so you can integrate it into home assistant.
Sourcecode:
MSI for windows:
http://files.tuxist.de/files/zaehler2mqtt-1.0.0.msi
(needs reboot after installation)
after install you can reach at browser:
http://127.0.0.1:8080
the electricity meter url is:
https://192.168.33.2/json/metering/origin/<your_meter_number>/extended
(ps you can copy the url from meter startpage)