Refactor MqttVerticle and GPS implementations: add stop method, update GPS serial handling, and improve WiFi connection logic with LED feedback

backend/src/main/java/net/miarma/contaminus/server/MqttVerticle.java

@@ -1,7 +1,18 @@
 package net.miarma.contaminus.server;
 
 import io.vertx.core.AbstractVerticle;
+import io.vertx.core.Promise;
 
 public class MqttVerticle extends AbstractVerticle  {
+	
+	@Override
+	public void start(Promise<Void> startPromise) {
+		
+	}
+	
+	@Override
+	public void stop(Promise<Void> startPromise) {
+		
+	}
 
 }