Generating a serial number based on a MAC address

Projects Programming
1

Hi, back again with my Rally Rampage button programming issues.
I am getting an error connected to generating a serial number based on a MAC address.
I have tried the suggested change by IDE but to no avail.
I have the following error - 'ESP_MAC_WIFI_STA' was not declared in this scope

My code


// Function to generate a serial number based on the last 3 bytes of the MAC address
// Function to generate a 6-digit serial number based on the last 3 bytes of the MAC address
String generateSerialNumber() {
  uint8_t baseMac[6];
  esp_read_mac(baseMac, ESP_MAC_WIFI_STA); // Read the MAC address
  // Extract the last 3 bytes of the MAC address and convert them to a 6-character string
  char serialNumber[7]; // 6 hex digits + null terminator
  sprintf(serialNumber, "%02X%02X%02X", baseMac[3], baseMac[4], baseMac[5]);

  return String(serialNumber); // Return the 6-character serial number
}
2

Try:

	uint8_t macAddrBytes[6];
	WiFi.macAddress(macAddrBytes);

or

	String macAddrString {WiFi.macAddress()};
3

Hi, I get the same. I have tried both and still getting errors.

4

The functions I posted compile fine for me.

You haven't supplied enough information. Post a complete code that demonstrates the error. Tell us which version of the ESP32 Arduino Core you are using.

5

Hi @sloth1 ,

ESP_MAC_WIFI_STA is of type enum and defined in the file "esp_mac.h" ...

See here
https://github.com/espressif/esp-idf/blob/master/components/esp_hw_support/include/esp_mac.h

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;

If you get the error message 'ESP_MAC_WIFI_STA' was not declared in this scope a link to this file is missing, either a direct include in your code or (most likely) a missing include of another library that includes this file or you haven't chosen the correct board setup ...

As @gfvalvo wrote: To find the reason requires that you post your complete code ...

Good luck!
ec2021

6

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