Most of those prerequisites are fulfilled:
- Software download: check
- Password for software: check
- Password (flyer) for charger: check
- Using Smartgateways to read P1 data (MQTT into HA)
- EVCC add-on (in my case using HA as home automation)
My main bottleneck for the moment is getting the network connection setup in my garage (25m away from meter room) and once that is done I will let you know how it all worked out.
Many thanks for the guidelines!