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esp_err_t Flash::initBaseMacAddress()
{
    char macAddrAscii[18] = { NULL_CHAR };
    esp_err_t rc = ESP_OK;

    ESP_FUSE3 fuse3;

    // see whether efuse has been programmed yet.
    // (if programmed, won't be all 0s.)
    // if not programmed, do so using the flash value, and do the CRC as well.
    rc = esp_efuse_read_block(EFUSE_BLK3, &fuse3, 0, 192);
    ESP_LOGI(TAG, "initBaseMacAddress(): efuse BLK3 is programmed as follows:");
    ESP_LOGI(TAG, "initBaseMacAddress(): efuse BLK3 version field is programmed as %x: ", fuse3.version);
    ESP_LOGI(TAG, "initBaseMacAddress(): efuse BLK3 MAC field is programmed as %02x:%02x:%02x:%02x:%02x:%02x.",
             fuse3.macAddr[0], fuse3.macAddr[1], fuse3.macAddr[2],
            fuse3.macAddr[3],fuse3.macAddr[4],fuse3.macAddr[5]);
    ESP_LOGI(TAG, "initBaseMacAddress(): efuse BLK3 CRC field is programmed as %x: ", fuse3.crc);



    rc = esp_efuse_mac_get_custom(fuse3.macAddr);
    if (rc == ESP_OK)
    {
        ESP_LOGI(TAG, "taskInit(): esp_efuse_mac_get_custom returned successfully.");
        mac_itoa(fuse3.macAddr, macAddrAscii);
        setMacAddr(macAddrAscii);
    }
    else if (rc == ESP_ERR_INVALID_VERSION) // this error suggests the MAC hasn't been programmed.
    {
        ESP_LOGW(TAG, "initBaseMacAddress(): invalid version in efuse BLK3; attempting to program.");

        // fill the fields in the structure and program the fuse.
        fuse3.version = 1;                                  // anything non-zero will do for now.
        memset (fuse3.reserved, 0, sizeof(fuse3.reserved)); // make sure it's all zeroes (no write).
        strcpy(macAddrAscii, getMacAddr().c_str());       // get address in string format from flash.

        if (strcmp(macAddrAscii, NVS_INVALID))
        {
            rc = mac_atoi(fuse3.macAddr, macAddrAscii);            // convert to binary
            if (rc == ESP_OK)
            {
                fuse3.crc = crc8Maxim(fuse3.macAddr, 6);

                ESP_LOGI(TAG, "initBaseMacAddress(): programming efuse BLK3 as follows:");
                ESP_LOGI(TAG, "initBaseMacAddress(): programming efuse BLK3 version field as %x: ", fuse3.version);
                ESP_LOGI(TAG, "initBaseMacAddress(): programming efuse BLK3 MAC field as %02x:%02x:%02x:%02x:%02x:%02x.",
                         fuse3.macAddr[0], fuse3.macAddr[1], fuse3.macAddr[2],
                        fuse3.macAddr[3],fuse3.macAddr[4],fuse3.macAddr[5]);
                ESP_LOGI(TAG, "initBaseMacAddress(): programming efuse BLK3 CRC field as %x: ", fuse3.crc);

                // program fuse 3.
                rc = esp_efuse_write_block(EFUSE_BLK3, &fuse3, 0, 192);
                if (rc == ESP_OK)
                {
                    ESP_LOGI(TAG, "initBaseMacAddress(): efuse BLK3 successfully programmed.");
                    mac_itoa(fuse3.macAddr, macAddrAscii);
                    setMacAddr(macAddrAscii);
                }
                else
                {
                    ESP_LOGE(TAG, "initBaseMacAddress(): error writing custom MAC into efuse BLK3; halting execution.");
                    vTaskDelay(portMAX_DELAY);
                }
                ...

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I (69) Flash: initBaseMacAddress(): efuse BLK3 is programmed as follows:
I (79) Flash: initBaseMacAddress(): efuse BLK3 version field is programmed as 1:
I (89) Flash: initBaseMacAddress(): efuse BLK3 MAC field is programmed as 00:a0:d0:00:00:00.
I (99) Flash: initBaseMacAddress(): efuse BLK3 CRC field is programmed as 32:
E (109) system_api: Base MAC address from BLK3 of EFUSE version error, version = 0
W (109) Flash: initBaseMacAddress(): invalid version in efuse BLK3; attempting to program.
I (119) Flash: initBaseMacAddress(): programming efuse BLK3 as follows:
I (129) Flash: initBaseMacAddress(): programming efuse BLK3 version field as 1:
I (139) Flash: initBaseMacAddress(): programming efuse BLK3 MAC field as 12:23:34:45:56:67.
I (149) Flash: initBaseMacAddress(): programming efuse BLK3 CRC field as fa:
E (149) efuse: Repeated programming of programmed bits is strictly forbidden 0x10200032
E (159) Flash: initBaseMacAddress(): error writing custom MAC into efuse BLK3; halting execution.

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 rc = esp_efuse_mac_get_custom(fuse3.macAddr);

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struct ESP_FUSE3
{
    uint8_t crc;
    uint8_t macAddr[6];
    uint8_t reserved[8];
    uint8_t version;
};

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rc = esp_efuse_mac_get_custom(fuse3.macAddr);