Show ip and mac after connect (#125)

When not using advanced network config, the ip is optained via DHCP, so display it after the connection is established. Output was 0.0.0.0 in this case before.
Also adding display of the mac for mac address filter config in the wifi-ap.

OpenMQTTGateway.ino

@@ -201,13 +201,18 @@ void setup_wifi() {
   IPAddress dns_adress(Dns);
   WiFi.begin(wifi_ssid, wifi_password);
   //WiFi.config(ip_adress,gateway_adress,subnet_adress); //Uncomment this line if you want to use advanced network config
-  trc(F("OpenMQTTGateway ip: "));
-  Serial.println(WiFi.localIP());
-
+    
+  trc(F("OpenMQTTGateway mac: "));
+  Serial.println(WiFi.macAddress()); 
+  
   while (WiFi.status() != WL_CONNECTED) {
     delay(500);
     trc(F("."));
   }
+  
+  trc(F("OpenMQTTGateway ip: "));
+  Serial.println(WiFi.localIP());
+  
   trc(F("WiFi ok"));
 }
 #else