On Air: Blink while searching WLAN

D1 mini/On_Air/On_Air.ino

@@ -30,12 +30,16 @@ void setup() {
   WiFi.begin(ssid, password);
  
   while (WiFi.status() != WL_CONNECTED) {
-    delay(500);
     Serial.print(".");
+    delay(250);
+    digitalWrite(BUILTIN_LED, LOW);
+    delay(250);
+    digitalWrite(BUILTIN_LED, HIGH);
   }
   Serial.println();
   Serial.print("IP address: ");
   Serial.println(WiFi.localIP());
+  digitalWrite(BUILTIN_LED, HIGH);
 
   server.on("/click", handle_click);
   server.on("/light", handle_light);
@@ -126,5 +130,5 @@ void handle_light(){
 }
 
 void handle_NotFound(){
-  server.send(404, "text/plain", "Not found");
+  server.send(404, "text/plain", "On Air: Page not found");
 }