Set MAC address of board manually

Projects General Guidance
1

Hey experts,

I am SRJ,
Beginner in IOT.
I am trying to use ESP-NOW
but my issue is as below.

Giving MAC address of the board is compulsory in code, but I want to set it manually
How can I store MAC address in EEPROM of my board?
& convert it to uint8_t ???

I am attaching my code sample for extra details...

#include <ESP8266WiFi.h>
#include <espnow.h>
#include <EEPROM.h>


// REPLACE WITH RECEIVER MAC Address
uint8_t broadcastAddress[] = {0x48, 0xF3, 0xEB, 0xAF, 0x50, 0x91};

// Structure example to send data
// Must match the receiver structure
typedef struct struct_message {
  char a[32];
  int b;
  float c;
  String d;
  bool e;
} struct_message;

// Create a struct_message called myData
struct_message myData;

unsigned long lastTime = 0;  
unsigned long timerDelay = 2000;  // send readings timer

// Callback when data is sent
void OnDataSent(uint8_t *mac_addr, uint8_t sendStatus) {
  Serial.print("Last Packet Send Status: ");
  if (sendStatus == 0){
    Serial.println("Delivery success");
  }
  else{
    Serial.println("Delivery fail");
  }
}
 
void setup() {
  // Init Serial Monitor
  Serial.begin(115200);
 
  // Set device as a Wi-Fi Station
  WiFi.mode(WIFI_STA);

  // Init ESP-NOW
  if (esp_now_init() != 0) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  // Once ESPNow is successfully Init, we will register for Send CB to
  // get the status of Trasnmitted packet
  esp_now_set_self_role(ESP_NOW_ROLE_SLAVE);
  esp_now_register_send_cb(OnDataSent);
  
  // Register peer
  esp_now_add_peer(broadcastAddress, ESP_NOW_ROLE_SLAVE, 1, NULL, 0);
}
 
void loop() {
  if ((millis() - lastTime) > timerDelay) {
    // Set values to send
    strcpy(myData.a, "THIS IS A CHAR");
    myData.b = random(1,20);
    myData.c = 1.2;
    myData.d = "Hello";
    myData.e = false;

    // Send message via ESP-NOW
    esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));

    lastTime = millis();
  }
}

please help me for my question...

THANKS
-SRJ

2

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/misc_system_api.html?highlight=change%20mac%20address

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/search.html?q=setting+mac+address&check_keywords=yes&area=default

will give clues.

3

Can I change custom MAC address of the board after code is uploaded?

4

The answer is in the manual, did you read it? If you'd like me to read it for you we can work out terms of payment for my time.