Add start and end signal to telegram

MobileApp/app/src/main/java/com/example/lfrmobileapp/Communication.java

@@ -12,7 +12,7 @@ import java.util.Objects;
 
 public class Communication {
     public String telegram(int[] wheels, int strenght){
-        String tel = "";
+        String tel = "aa";
         tel += "0"; //Manuel mode
 
         for(int i = 0; i < wheels.length; i++){
@@ -24,6 +24,7 @@ public class Communication {
                 tel += ";0.00";
             }
         }
+        tel += "zz";
         return tel;
     }