Great @Stas_H 
I’m happy to see your energy dongle is working.
For everyone who gets a “unable to read data” error, this could be because during initial boot and configuration, the Energy Dongle is using more power that the energy meter can provide on its own. Powering the energy dongle with a power adapter at least until boot is complete should solve that problem.
After it is setup you should be able to remove the power adapter
