private void stopSketchBlockSendTimeout(){
  if (sketchBlockSendTimeout != null) {
    sketchBlockSendTimeout.cancel();
    sketchBlockSendTimeout=null;
  }
}

private void stopSketchBlockSendTimeout ( ) { if ( sketchBlockSendTimeout != null ) { sketchBlockSendTimeout . cancel ( ) ; sketchBlockSendTimeout = null ; } }
cancel the block send timer and null it to indicate it is no longer running .
