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<nowiki>ESPNOW communication works b
…
ESPNOW communication works based on the MAC address of the nodes. So, we need to find the Mac address of our slave or receiver node.

]For that just upload the following sketch to the ESP32 board and look for the Mac address in the serial monitor.
#include "WiFi.h"

void setup(){
Serial.begin(115200);
WiFi.mode(WIFI_MODE_STA);
Serial.println(WiFi.macAddress());
}

void loop(){
}
Once you uploaded the code, press the EN button and wait for the serial monitor results. It will show you the Mac address. Note that.
ded the code, press the EN button and wait for the serial monitor results. It will show you the Mac address. Note that.</nowiki> +

<nowiki>Next, we need to prepare the … Next, we need to prepare the transmitter, for that use this example sketch which can send multiple data types of data to the particular slave node.

  
  // Register peer
  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  peerInfo.channel = 0;  
  peerInfo.encrypt = false;
  
  // Add peer        
  if (esp_now_add_peer(&peerInfo) != ESP_OK){
    Serial.println("Failed to add peer");
    return;
  }
}
 
void loop() {
  // Set values to send
  strcpy(myData.a, "I'm alive");
  myData.b = random(1,20);
  myData.c = 1.2;
  myData.d = false;
  
  // Send message via ESP-NOW
  esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
   
  if (result == ESP_OK) {
    Serial.println("Sent with success");
  }
  else {
    Serial.println("Error sending the data");
  }
  delay(2000);
}

Note: Change the Mac Address here

Here are the serial monitor results, it show sent success but not delivered. Because we don't have the receiver.

Let's try to implement the receiver.re the serial monitor results, it show sent success but not delivered. Because we don't have the receiver.<br /><br />Let's try to implement the receiver.</nowiki> +

<nowiki>With the help of below examp … With the help of below example sketch, you can receive the data from the master and it will print that into the serial monitor.

#include 
#include 

// Structure example to receive data
typedef struct struct_message {
    char a[32];
    int b;
    float c;
    bool d;
} struct_message;

// Create a struct_message called myData
struct_message myData;

// callback function that will be executed when data is received
void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
  memcpy(&myData, incomingData, sizeof(myData));
  Serial.print("Bytes received: ");
  Serial.println(len);
  Serial.print("Char: ");
  Serial.println(myData.a);
  Serial.print("Int: ");
  Serial.println(myData.b);
  Serial.print("Float: ");
  Serial.println(myData.c);
  Serial.print("Bool: ");
  Serial.println(myData.d);
  Serial.println();
}
 
void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  
  // Set device as a Wi-Fi Station
  WiFi.mode(WIFI_STA);

  // Init ESP-NOW
  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }
  
  // get recv packer info
  esp_now_register_recv_cb(OnDataRecv);
}
 
void loop() {

}

Serial monitor results.ror initializing ESP-NOW");<br /> return;<br /> }<br /> <br /> // get recv packer info<br /> esp_now_register_recv_cb(OnDataRecv);<br />}<br /> <br />void loop() {<br /><br />}</pre></div>Serial monitor results.</nowiki> +

<section id="story"><br />We have seen how to implement the ESP NOW in ESP32 microcontroller, in upcoming tutorials will see how to transmit sensor data via ESPNOW.<br /></section> +
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[https://www.theengineeringprojects.com/20 … [https://www.theengineeringprojects.com/2022/01/esp-now-protocol-with-esp32-and-esp8266.html ESP-NOW] is a wireless communication protocol that is different from Wi-Fi and Bluetooth in that it reduces the five layers of the OSI model to only one1. Additionally, ESP-NOW occupies fewer CPU and flash resources than traditional connection protocols while co-exists with Wi-Fi and Bluetooth LE. Bluetooth is used to connect short-range devices for sharing information, while Wi-Fi is used for providing high-speed internet access2. Wi-Fi provides high bandwidth because the speed of the internet is an important issue. ===Max Distance: === The range of ESP-NOW is up to 480 meters when using the ESP-NOW protocol for bridging between multiple ESP32s1. The range can be further increased by enabling long-range ESP-NOW. When enabled, the PHY rate of ESP32 will be 512Kbps or 256Kbps. ===Maximum nodes: === ESP-NOW supports various series of Espressif chips, providing a flexible data transmission that is suitable for connecting “one-to-many” and “many-to-many” devices. ===Applications: === ESP-NOW is widely used in *smart-home appliances, *remote controlling, *sensors, etc. In this tutorial, will see how to implement a basic ESP NOW communication between ESP32 Microcontrollers.munication between ESP32 Microcontrollers. +