Status is show during bootup and OTA by lighting some of the LEDs.

src/main.cpp

@@ -122,21 +122,56 @@ void setup_fastled() {
 	set_all_leds(CRGB::Black);
 }
 
+void show_all() {
+	for(Node* node : nodes) {
+		node->draw();
+	}
+	FastLED.show();
+}
+
+void show_status(uint8_t status, CRGB color=CRGB::Green) {
+	for (int i=0; i<status; i++) {
+		if (i<corners.size()) {
+			corners[i]->set_color(color);
+		}
+	}
+	for (int i=status; i<corners.size(); i++) {
+		corners[i]->set_color(CRGB::Black);
+	}
+	show_all();
+}
+
 void setup() {
 	Serial.begin(74880);
 	LOGln("ESPleaf starting.");
 
-	setup_layout();
+	
 	setup_fastled();
+	show_status(1);
+
+	setup_layout();
+	show_status(2);
+
 	#ifdef TEST_MODE
 		LOGln("TEST_MODE is active!");
 	#else
 		wifi_setup();
+
+		show_status(3);
+
 		mqtt_setup();
 		ArduinoOTA.setHostname(OTA_HOSTNAME);
+		ArduinoOTA.onProgress([&](unsigned int progress, unsigned int total){
+			uint8_t count = progress * corners.size() / total;
+			show_status(count, CRGB::Blue);
+		});
+		ArduinoOTA.onEnd([](){ show_status(0); });
 		ArduinoOTA.begin();
-	#endif
 
+		show_status(255);
+		delay(250);
+		show_status(0);
+	#endif
 }
 
 void loop() {