support phase currents, and three-phase with enphase envoy

[pdeliot]

Added support phase currents, and three-phase with Enphase envoy #16744

[andig]

Not sure we can do this. This will return empty measurements on devices not supporting this?

[pdeliot]

Yes, this was discussed with ivoks on the issue discussion. Originally I was returning 0 when phase is not available. ivoks suggested returning empty and tested it on its one phase system successfully.

This is the choosen way to implement 3 or 1 phase support.

[andig]

We cannot simply return „nothing“.

[pdeliot]

It is "empty" because the phase 2 and 3 may not exist :-) And it is working well.

But if you prefer having "0" and this is not creating issue for systems with only 1 phase.. we can do that.

[andig]

We just cannot have this interface for 1p meters

[pdeliot]

I've pushed version return 0 when value is not available instead on "empty".

[andig]

@premultiply was meinst du? Gute Idee?