Fixed crash when 0 length packet was send to tunnel

Now UDP packets with 0 length are discarded without answer to sender.
Minor

hover-controller/hover-controller.cpp

@@ -139,7 +139,9 @@ int main(int argc, char** argv) {
         radio.startListening();
         #endif
 
-
+        //clean buffer
+        //buffer[0]='\0';
+        //memset(buffer, 0, sizeof(buffer));
 
     }while(loop_on);
     

rfudp/TxTunnelSender.cpp

@@ -154,6 +154,10 @@ int main(int argc, char** argv){
             inet_ntoa(cliaddr.sin_addr),    // addrress
             ntohs(cliaddr.sin_port)         // port
         );
+        if ( n ==0 ) {
+            printf("empty msg, discarded\n");
+            continue;
+        }
         printf("MSG: \'%s\'\n", buffer);
 
 
@@ -203,6 +207,10 @@ int main(int argc, char** argv){
              (const struct sockaddr *) &cliaddr, cliaddr_len
         );
 
+        //clean buffer
+        //buffer[0]='\0';
+        //memset(buffer, 0, sizeof(buffer));
+
     }while(loop_on);
     
     // Power down the antenna

rfudp/client_test.cpp

@@ -63,5 +63,6 @@ do{
 
   buffer[n] = '\0';
   printf("ANS: \'%s\'\n", buffer);
+  //buffer[0]='\0';
 }while(loop_on);
 }