Possibly a little late now, but found some useful code for talking to MyEnergi devices at:
https://github.com/G6EJD/MyEnergi-Python-ExampleHope to have an Eddi + Harvi working with a solar system in near future, so ready to try the new plugin.
Z-wave system with 80+ devices, Indigo7 on a dedicated MacMini
Controlling lighting, heating, hotwater, security; but still a lot to learn ...