code clean

src/main.cpp

@@ -116,13 +116,13 @@ void setup() {
   yield();
 
   ArduinoOTA.onStart([]() {
-      Serial.print("\n\nOTA Update\n");
+      Serial.print("\n\nOTA Update: ");
       display.clear();
       display.loop();
   });
   ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
       double ratio = (double) progress / (double) total;
-      Serial.printf("\r%3.0f%%", ratio * 100);
+      Serial.printf("\rOTA Update: %3.0f%%", ratio * 100);
 
       auto index = (uint16_t) round(ratio * (double) display.pixelCount);
       auto color = (uint8_t) round(ratio * 255.0);
@@ -239,6 +239,9 @@ void serial_read() {
       case '.':
         setSpeed(speed * 1.1);
         break;
+      default:
+        Serial.printf("Unknown command: %c\n", input);
+        break;
     }
   }
 }