WiFiSTA - method setDNS as in WiFi libraries by Arduino (#8854)

https://www.arduino.cc/reference/en/libraries/wifi/wifi.setdns/

Author: JAndrassy

Diff for: libraries/WiFi/src/WiFiSTA.cpp

@@ -431,6 +431,19 @@ bool WiFiSTAClass::config(IPAddress local_ip, IPAddress gateway, IPAddress subne
     return err == ESP_OK;
 }
 
+/**
+ * Change DNS server for static IP configuration
+ * @param dns1       Static DNS server 1
+ * @param dns2       Static DNS server 2 (optional)
+ */
+bool WiFiSTAClass::setDNS(IPAddress dns1, IPAddress dns2)
+{
+    if(WiFiGenericClass::getMode() == WIFI_MODE_NULL)
+        return false;
+    esp_err_t err = set_esp_interface_dns(ESP_IF_WIFI_STA, dns1, dns2);
+    return err == ESP_OK;
+}
+
 /**
  * is STA interface connected?
  * @return true if STA is connected to an AP

Diff for: libraries/WiFi/src/WiFiSTA.h

@@ -56,6 +56,7 @@ class WiFiSTAClass
     wl_status_t begin();
 
     bool config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns1 = (uint32_t)0x00000000, IPAddress dns2 = (uint32_t)0x00000000);
+    bool setDNS(IPAddress dns1, IPAddress dns2 = (uint32_t)0x00000000);  // sets DNS IP for all network interfaces
 
     bool reconnect();
     bool disconnect(bool wifioff = false, bool eraseap = false);