@luma, you’re awesome, thanks!
I wasn’t sure how the labeling was setup on the Nextion, and wanted to double-check before I start soldering. I traced them out on your PCB (D5 & D7), but I’m not 100% sure as to which pins TX/RX on the Wemos for Serial1 in SoftwareSerial.
Plus, sometimes the labeling on these things aren’t consistent. The Sonoff B20s, for instance, the TX goes to TX on your programmer, which I figured out after I had quite a few tufts of hair on my desk.
Oh, and much nicer pic… Thanks again!