Disable Wifi when AMPEL_WIFI is not defined

ampel-firmware/ampel-firmware.ino

@@ -55,6 +55,18 @@
  * and define your credentials and parameters in 'config.h'.
  */
 
+
+/*****************************************************************
+ * PreInit                                                         *
+ *****************************************************************/
+void preinit() {
+#ifndef AMPEL_WIFI
+  // Disable wifi as default
+  ESP8266WiFiClass::preinitWiFiOff();
+#endif
+}
+
+
 /*****************************************************************
  * Setup                                                         *
  *****************************************************************/