获取ESP32的mac地址

据说ESP32的mac地址可以作为设备的唯一ID，在esp-idf的esp_mac.h中定义了mac的几种类型

typedef enum {
    ESP_MAC_WIFI_STA,      /**< MAC for WiFi Station (6 bytes) */
    ESP_MAC_WIFI_SOFTAP,   /**< MAC for WiFi Soft-AP (6 bytes) */
    ESP_MAC_BT,            /**< MAC for Bluetooth (6 bytes) */
    ESP_MAC_ETH,           /**< MAC for Ethernet (6 bytes) */
    ESP_MAC_IEEE802154,    /**< if CONFIG_SOC_IEEE802154_SUPPORTED=y, MAC for IEEE802154 (8 bytes) */
    ESP_MAC_BASE,          /**< Base MAC for that used for other MAC types (6 bytes) */
    ESP_MAC_EFUSE_FACTORY, /**< MAC_FACTORY eFuse which was burned by Espressif in production (6 bytes) */
    ESP_MAC_EFUSE_CUSTOM,  /**< MAC_CUSTOM eFuse which was can be burned by customer (6 bytes) */
    ESP_MAC_EFUSE_EXT,     /**< if CONFIG_SOC_IEEE802154_SUPPORTED=y, MAC_EXT eFuse which is used as an extender for IEEE802154 MAC (2 bytes) */
} esp_mac_type_t;

可以通过esp_err_t esp_read_mac(uint8_t *mac, esp_mac_type_t type);获取mac相应类型的mac地址，

也可通过esp_err_t esp_efuse_mac_get_default(uint8_t *mac);获取ESP_MAC_BASE

通过遍历mac枚举，循环输出相应类型的mac地址

#include <esp_mac.h>

void mac_address_(){
  // 获取mac地址
  uint8_t mac_address[6];
  esp_err_t err;
  for (esp_mac_type_t mac_type = ESP_MAC_WIFI_STA; mac_type <= ESP_MAC_EFUSE_EXT; mac_type = static_cast<esp_mac_type_t>(mac_type + 1))
  {
      printf(
          "MAC Type: %d (%s)\n", mac_type,
          mac_type == ESP_MAC_WIFI_STA        ? "ESP_MAC_WIFI_STA"
          : mac_type == ESP_MAC_WIFI_SOFTAP   ? "ESP_MAC_WIFI_SOFTAP"
          : mac_type == ESP_MAC_BT            ? "ESP_MAC_BT"
          : mac_type == ESP_MAC_ETH           ? "ESP_MAC_ETH"
          : mac_type == ESP_MAC_IEEE802154    ? "ESP_MAC_IEEE802154"
          : mac_type == ESP_MAC_BASE          ? "ESP_MAC_BASE"
          : mac_type == ESP_MAC_EFUSE_FACTORY ? "ESP_MAC_EFUSE_FACTORY"
          : mac_type == ESP_MAC_EFUSE_CUSTOM  ? "ESP_MAC_EFUSE_CUSTOM"
          : mac_type == ESP_MAC_EFUSE_EXT     ? "ESP_MAC_EFUSE_EXT"
                                              : "Unknown");
      err = esp_read_mac(mac_address, mac_type);
      if (err == ESP_OK)
      {
          printf("MAC Address: " MACSTR "\n\n", mac_address[0], mac_address[1], mac_address[2], mac_address[3], mac_address[4], mac_address[5]);
      }
      else
      {
          printf("Failed to read MAC address: %s\n\n", esp_err_to_name(err));
      }
  }
}

ESP32-S3 结果如下：

MAC Type: 0 (ESP_MAC_WIFI_STA)
MAC Address: e8:06:90:97:fa:50

MAC Type: 1 (ESP_MAC_WIFI_SOFTAP)
MAC Address: e8:06:90:97:fa:51

MAC Type: 2 (ESP_MAC_BT)
MAC Address: e8:06:90:97:fa:52

MAC Type: 3 (ESP_MAC_ETH)
MAC Address: e8:06:90:97:fa:53

MAC Type: 4 (ESP_MAC_IEEE802154)
E (4105) system_api: 4 mac type is incorrect (not found)
Failed to read MAC address: ESP_ERR_NOT_SUPPORTED

MAC Type: 5 (ESP_MAC_BASE)
MAC Address: e8:06:90:97:fa:50

MAC Type: 6 (ESP_MAC_EFUSE_FACTORY)
MAC Address: e8:06:90:97:fa:50

MAC Type: 7 (ESP_MAC_EFUSE_CUSTOM)
E (4130) system_api: eFuse MAC_CUSTOM is empty
E (4135) system_api: unsupported mac type
E (4140) system_api: MAC address generation error
Failed to read MAC address: ESP_ERR_NOT_SUPPORTED

MAC Type: 8 (ESP_MAC_EFUSE_EXT)
E (4153) system_api: 8 mac type is incorrect (not found)
Failed to read MAC address: ESP_ERR_NOT_SUPPORTED

可以看出 ESP_MAC_BASE、ESP_MAC_EFUSE_FACTORY、ESP_MAC_WIFI_STA是一样的

如果用Ardunio的<wifi.h>，也能获取地址，和ESP_MAC_WIFI_STA一样的

#include <WiFi.h>

void mac_address() {
  uint8_t mac[6];
  WiFi.macAddress(mac);

  Serial.print("MAC Address: ");
  for (int i = 0; i < 6; ++i) {
    Serial.printf("%02X", mac[i]);
    if (i != 5) Serial.print(":");
  }
  Serial.print("\n\n");
}