I have one of these installed
but am thinking of changing to one that supports rs485 :-)
like this one
Heatmiser will give the protocol docs out, and it looks similar to resol vbus :-)
EDIT: they sent me the docs for V3 protocol which is the current shipping model
at last, the kind folks in Resol sent me the protocol specification for vbus with openwrt and rrdcollect and rrdcgi, I can now graph the ...
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