Add Compilation Condition for mDNS

Add Compilation Condition for mDNS  as not mandatory

esp8266/esp8266.ino

@@ -37,7 +37,9 @@
 #include <ESP8266WiFi.h>
 #include <WiFiClient.h>
 #include <ESP8266WebServer.h>
+#if MDNS_FEATURE
 #include <ESP8266mDNS.h>
+#endif
 extern "C" {
 #include "user_interface.h"
 }
@@ -83,8 +85,10 @@ void setup() {
 
 //main loop
 void loop() {
+#if MDNS_FEATURE
  // Check for any mDNS queries and send responses
 wifi_config.mdns.update();
+#endif
 //web requests
 web_interface.WebServer.handleClient();
 //TODO use a method to handle serial also in class and call it instead of this one

esp8266/wifi.cpp

@@ -22,7 +22,9 @@
 #include "config.h"
 #include "ESP8266WiFi.h"
 #include "IPAddress.h"
+#if MDNS_FEATURE
 #include <ESP8266mDNS.h>
+#endif
 extern "C" {
 #include "user_interface.h"
 }
@@ -132,6 +134,7 @@ bool WIFI_CONFIG::Setup()
       if (wifi_get_opmode()==WIFI_AP || wifi_get_opmode()==WIFI_AP_STA)  configAP( local_ip,  gateway,  subnet);
       else WiFi.config( local_ip,  gateway,  subnet); 
     }
+    #if MDNS_FEATURE
     //Get IP
     if (wifi_get_opmode()==WIFI_STA)currentIP=WiFi.localIP();
     else currentIP=WiFi.softAPIP();
@@ -144,6 +147,7 @@ bool WIFI_CONFIG::Setup()
   if (!mdns.begin("esp8266", currentIP)) {
     Serial.println("Error setting up MDNS responder!");
     }
+    #endif
   return true;
 }
 

esp8266/wifi.h

@@ -21,15 +21,20 @@
 #ifndef WIFI_h
 #define WIFI_h
 #include <Arduino.h>
+#include "config.h"
 #include "IPAddress.h"
 #include <ESP8266WiFi.h>
+#if MDNS_FEATURE
 #include <ESP8266mDNS.h>
+#endif
 
 class WIFI_CONFIG
 {
   public:
   // multicast DNS responder feature
+  #if MDNS_FEATURE
   MDNSResponder mdns;
+  #endif
   bool Setup();
   char * mac2str(uint8_t mac [WL_MAC_ADDR_LENGTH]);
   char * ip2str(IPAddress Ip );