Getting DHCP options using ESP32

Question

I've dealing with an ESP32 module (ESP-IDF) trying to connect via Wifi and ethernet to a dhcp server. The point is, I'm trying to get the DHCP options, but I failed...

I tried using LWIP and also ESP-NETIF. (I have also to guess whats XXXX and YYYY)

// Create an esp_netif pointer to store current interface
  esp_netif_t* ifscan = esp_netif_next(NULL);

  // Stores the unique interface descriptor, such as "PP1", etc
  char ifdesc[7];
  ifdesc[6] = 0;  // Ensure null terminated string
  uint32_t value = 0;

  while (ifscan != NULL)
  {
      esp_netif_get_netif_impl_name(ifscan, ifdesc);
      Serial.printf("IF NAME: %s\n", ifdesc);

      esp_err_t code = esp_netif_dhcpc_option(ifscan, ESP_NETIF_OP_GET, ESP_NETIF_DOMAIN_NAME_SERVER, XXXX, YYYY);
      Serial.printf("RES: %s - OPTION: %s\n", esp_err_to_name(code), XXXXX);
   


      // Get the next interface
      ifscan = esp_netif_next(ifscan);
  }
      Serial.printf("Done listing network interfaces");

Does anyone have an example of sourcecode showing how to get the options after connecting?

Thank you in advance.