I have inverter of different brand and also had concern to allow it internet connection, so i ended with pi zero connected to it’s internal wifi with socat port

I have inverter of different brand and also had concern to allow it internet connection, so i ended with pi zero connected to it’s internal wifi with socat port gateway, a route on router to simulate it’s internal network and it’s app works thinking it is connected locally to device, even over vpn back to home.