ESP-NOW protocol is used to allow ESP-32 controllers to communicate in simplex mode. Link to code: Contents: 0:00 Introduction 0:29 ESP-NOW Protocol Specs 1:21 Circuit Diagram 2:25 Demonstration 2:46 C++ Sketch of Transmitter 4:55 C++ Sketch of Receiver 6:13 Future Project: Duplex Communication of ESP32-to-ESP32