This is not so much a question, as it may be an answer to anyone wanting to develop (or just wanting) an ESP32 based solution to monitor and control a Multiplus II using an ESP32.
I just now released an open source Arduino project for this.
It uses the MQTT info being generated from my Raspberry Pi Zero 2 W running Venus (GX).
Here's an example picture of it running:
If your interested, the source is posted on Github here:
https://github.com/roblatour/ESP32RemoteForVictron/
Hope it will be of use to you.
Rob