void setup() {
  Serial.begin(115200);
}

void loop() {
  
  Serial.printf("ESP32 Chip model = %s Rev %d\n", ESP.getChipModel(), ESP.getChipRevision());
  uint64_t chipid;
  chipid = ESP.getEfuseMac(); //The chip ID is essentially its MAC address(length: 6 bytes).
  Serial.printf("ESP32 Chip ID = %04X", (uint16_t)(chipid >> 32)); //print High 2 bytes
  Serial.printf("%08X\n", (uint32_t)chipid); //print Low 4bytes. 
  Serial.printf("This chip has %d cores\n", ESP.getChipCores());

  delay(3000);
}