#include "esp_mac.h"


void setup() {
  Serial.begin(115200);
  uint8_t mac[6] = {0};
  esp_efuse_mac_get_default(mac);
  Serial.printf( 
    "ESP MAC Address = %02X:%02X:%02X:%02X:%02X:%02X\n", 
    mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]
  );
}

void loop() {

}