+
+ /**
+ * Inform listeners that the network node has notified us about a failure in
+ * executing the controller generated asynchronous request identified by the
+ * passed unique id.
+ *
+ * @param requestId
+ * the unique id associated with the request which failed to be
+ * executed on the network node
+ * @param error
+ * the string describing the error reported by the network node
+ */
+ public void requestFailed(long requestId, String error);
+