WiFiSTA - method setDNS as in WiFi libraries by Arduino (#9021)

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

Author: JAndrassy

libraries/ESP8266WiFi/src/ESP8266WiFiSTA.cpp

@@ -339,6 +339,29 @@ bool ESP8266WiFiSTAClass::config(IPAddress local_ip, IPAddress arg1, IPAddress a
   return true;
 }
 
+/**
+ * Change DNS for static IP configuration
+ * @param dns1       Static DNS server 1
+ * @param dns2       Static DNS server 2 (optional)
+ */
+bool ESP8266WiFiSTAClass::setDNS(IPAddress dns1, IPAddress dns2) {
+
+  if((WiFi.getMode() & WIFI_STA) == 0)
+    return false;
+
+  if(dns1.isSet()) {
+      // Set DNS1-Server
+      dns_setserver(0, dns1);
+  }
+
+  if(dns2.isSet()) {
+      // Set DNS2-Server
+      dns_setserver(1, dns2);
+  }
+
+  return true;
+}
+
 /**
  * will force a disconnect an then start reconnecting to AP
  * @return ok

libraries/ESP8266WiFi/src/ESP8266WiFiSTA.h

@@ -45,7 +45,8 @@ class ESP8266WiFiSTAClass: public LwipIntf {
         //The argument order for ESP is not the same as for Arduino. However, there is compatibility code under the hood
         //to detect Arduino arg order, and handle it correctly. Be aware that the Arduino default value handling doesn't
         //work here (see Arduino docs for gway/subnet defaults). In other words: at least 3 args must always be given.
-        bool config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns1 = (uint32_t)0x00000000, IPAddress dns2 = (uint32_t)0x00000000);
+        bool config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns1 = INADDR_ANY, IPAddress dns2 = INADDR_ANY);
+        bool setDNS(IPAddress dns1, IPAddress dns2 = INADDR_ANY);
 
         bool reconnect();