I've just finished the installation of an ESS system to improve my autoconsumption here in Belgium.
I would like to add the information of the battery transfers and state to my home made PV monitoring system.
My current idea is to use MQTT to (locally, port 18883) read values at a relatively slow rate (once per 5 min). I'm mostly interested in battery state and the energy to and from batteries. Then write that to a file and FTP it to a website.
To be honest I'm new to MQTT (but I should be able to manage :) ) , is there a beginner's guide somewhere?
Today I tried MQTT explorer to browse through the available values. I could find what I was needing.
But one thing that I already see is that using the explorer the MQTT is refreshed only when I use the VRM. I guess that has something to do with the keep alive or so?
How will that be when I have the client running on my Pi connecting?