Add function overload to config to include DNS

Disable DHCP if using static IP

With dhcp disabled, I noticed about 50% less conncection time

Author: chadouming

hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/ESP8266WiFi.cpp

@@ -40,6 +40,7 @@ extern "C" void esp_yield();
 ESP8266WiFiClass::ESP8266WiFiClass()
 : _useApMode(false)
 , _useClientMode(false)
+, _useStaticIp(false)
 {
 }
 
@@ -103,7 +104,8 @@ int ESP8266WiFiClass::begin(const char* ssid, const char *passphrase, int32_t ch
         wifi_set_channel(channel);
     }
 
-    wifi_station_dhcpc_start();
+	if(!_useStaticIp)
+		wifi_station_dhcpc_start();
     return status();
 }
 
@@ -115,6 +117,8 @@ uint8_t ESP8266WiFiClass::waitForConnectResult(){
   return status();
 }
 
+
+// You will have to set the DNS-Server manually later since this will not enable DHCP
 void ESP8266WiFiClass::config(IPAddress local_ip, IPAddress gateway, IPAddress subnet)
 {
     struct ip_info info;
@@ -124,6 +128,26 @@ void ESP8266WiFiClass::config(IPAddress local_ip, IPAddress gateway, IPAddress s
 
     wifi_station_dhcpc_stop();
     wifi_set_ip_info(STATION_IF, &info);
+	
+	_useStaticIp = true;
+}
+
+void ESP8266WiFiClass::config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns)
+{
+    struct ip_info info;
+    info.ip.addr = static_cast<uint32_t>(local_ip);
+    info.gw.addr = static_cast<uint32_t>(gateway);
+    info.netmask.addr = static_cast<uint32_t>(subnet);
+
+    wifi_station_dhcpc_stop();
+    wifi_set_ip_info(STATION_IF, &info);
+
+    // Set DNS-Server
+    ip_addr_t d;
+    d.addr = static_cast<uint32_t>(dns);
+    dns_setserver(0,&d);
+	
+	_useStaticIp = true;
 }
 
 int ESP8266WiFiClass::disconnect()

hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/ESP8266WiFi.h

@@ -75,7 +75,6 @@ class ESP8266WiFiClass
      */
     void softAP(const char* ssid, const char* passphrase, int channel = 1);
 
-
     /* Change Ip configuration settings disabling the dhcp client
         *
         * param local_ip: 	Static ip configuration
@@ -84,6 +83,15 @@ class ESP8266WiFiClass
         */
     void config(IPAddress local_ip, IPAddress gateway, IPAddress subnet);
 
+	/* Change Ip configuration settings disabling the dhcp client
+        *
+        * param local_ip: 	Static ip configuration
+        * param gateway: 	Static gateway configuration
+        * param subnet:		Static Subnet mask
+		* param dns: 		Defined DNS
+        */
+    void config(IPAddress local_ip, IPAddress gateway, IPAddress subnet, IPAddress dns);
+	
     /* Configure access point
      *
      * param local_ip: access point IP
@@ -310,7 +318,8 @@ class ESP8266WiFiClass
 
     bool _useApMode;
     bool _useClientMode;
-
+	bool _useStaticIp;
+	
     static size_t _scanCount;
     static void* _scanResult;