+/// A callback reporting duplicate node detection.
+/** @param mesh A handle which represents an instance of MeshLink.
+ * @param node A pointer to a meshlink_node_t describing the node which is duplicate.
+ * This pointer is valid until meshlink_close() is called.
+ */
+typedef void (*meshlink_node_duplicate_cb_t)(meshlink_handle_t *mesh, meshlink_node_t *node);
+
+/// Set the node duplicate callback.
+/** This functions sets the callback that is called whenever a duplicate node is detected.
+ * The callback is run in MeshLink's own thread.
+ * It is therefore important that the callback uses apprioriate methods (queues, pipes, locking, etc.)
+ * to hand the data over to the application's thread.
+ * The callback should also not block itself and return as quickly as possible.
+ *
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param cb A pointer to the function which will be called when a duplicate node is detected.
+ * If a NULL pointer is given, the callback will be disabled.
+ */
+extern void meshlink_set_node_duplicate_cb(meshlink_handle_t *mesh, meshlink_node_duplicate_cb_t cb);
+