propagate testing state when tag discovered

remote-reader/app/src/main/java/com/vsmartcard/remotesmartcardreader/app/MainActivity.java

@@ -201,6 +201,7 @@ public class MainActivity extends Activity implements NfcAdapter.ReaderCallback
         if (nfcReader != null) {
             /* avoid updating UI components since this may end up on a non ui thread */
             vpcdDisconnect();
+            testing = true;
             vpcdConnect(nfcReader);
         }
     }