Does anyone know if it's possible to read the battery info from Victron blue smart chargers?

I’ve installed Theengs using WSL. It seems to install ok - I can see it connect to my mqtt server:
image
But, it doesn’t appear to be picking anything up. I can see devices using the nrf scanner, also the Victron bluetooth app.
Is this:

INFO:BLEGateway:Starting BLE scan
INFO:BLEGateway:Connected to MQTT broker
INFO:BLEGateway:Subscribed to home/+/BTtoMQTT/undecoded
ERROR:BLEGateway:[org.freedesktop.DBus.Error.ServiceUnknown] The name org.bluez was not provided by any .service files

an issue?