Hanchu ESS Integration. Anyone attempted anything with Bluetooth?

I’ve had Hanchu ESS batteries and an inverter installed and they have some great features but HA integration isn’t one of them, unfortunately.

I know there are a couple of prototype interegtations that scrape the Hanchu web site but Hanchu provide a local Bluetooth interface too and I wonder of that would be a better way in - though I’ve no idea what’s involved. HA does recognise the Bluetooth devices at lease though it has no way to connect to them.

Are there Bluetooth diagnostic tools I could use to explore a little?

(I have zero HA development experience.)