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https://arduino.stackexchange.com/questions/78552/wiring-up-an-esp-01-to-nano?answertab=votes#tab-top
https://www.electronicslovers.com/2017/11/learn-how-to-setup-wifi-module-esp8266.html
https://www.youtube.com/watch?v=YKn2ZXYb_EI
Trace: • esp01