As far as I am aware, the sketch as published in the forum here is correct and works (it reports V1.4, but it is really V1.6):
Any changes made by someone else, without referring it to me, are their responsibility.
OEM has always sent the output in watts. You can change the sketch if you wish, it is lines 942 - 951. The variables you want are I1rms, etc. But it means you will NOT know the real power, which is what you pay for, unless your send both power and current.
I’m afraid I don’t have an ESP8266, so I can’t investigate that side for you.