It's been a year or so since I first heard about the ESP-NOW method of sending data wirelessly between micro-controllers, so I finally got around to playing with it and seeing if I could make it work.
Here are some of the resources I referenced:
https://randomnerdtutorials.com/esp-now-esp8266-nodemcu-arduino-ide/
https://randomnerdtutorials.com/esp-now-esp32-arduino-ide/
https://www.espressif.com/en/solutions/low-power-solutions/esp-now
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This isn't the only way to do it.
It's probably not the best way to do it.