For Home Assistant? There are several about but this is the one that worked for me.
You need to enable it via the webconsole on the inverter. There is a magic reset sequence that will boot it up as an Access Point and then you connect via WiFi: full instructions
My octopus rate gives me 15p per kwH I export. The overnight rate is 7p per kwH so it makes sense to export as much as I can and charge the car on cheap rate.
The gap between sunset and cheap rate is about 4-8 kwH so rather than getting a battery my next step is a bi-directional charger so my car can cover the gap.