You’re talking to a hoarder, of course I do 
I can set up a serial link, but I guess I’ll need a debug version of the emonTX 3phase firmware, right?
Also, I’m wondering if this can have anything to do with the fact that I can no longer flash my emonTX via the exposed UART? I can only flash via ICSP (I was using Arduino as ISP), I reported that in the other thread here: Setup 3-phase emonTX with emonESP using emoncms.org - #25 by Z0l