I have a thread going about the capabilities of the emonTX because my end objective (I hope it’s permitted to post the link to my thread below) is very similar to yours.
So I am guessing, which is always dangerous!) that you have somehow wifi enabled your emonTX - is that right and if so how did you do it? Did you go down the ESP route, the PIZero route or something else?
Many thanks
https://community.openenergymonitor.org/t/emon-tx-v3-capabilities/19464/3