> my problem was squeezing the MTA API parser into the ESP32 flash... Ahh, I wouldn't do that. The way I've done it is by pushing as much of the API handling l

> my problem was squeezing the MTA API parser into the ESP32 flash... Ahh, I wouldn't do that. The way I've done it is by pushing as much of the API handling logic off the ESP32 and onto a standalone server. The ESP32 is effectively a dumb client which takes in instructions like "WRITE westminster 5 min" from the server and draws the appropriate text/pixels/etc. > as long as you use off-the-shelf / already conforming modules, like the esp wroom etc, the cost for FCC compliance testing goes down into the thousands. it's still a line item, but over a run of 1000-2000 units, it turns into something that costs about a buck per board :) yeah... it's $1 per board unless none of your boards sell :)