+meshlink_handle_t *devtool_open_in_netns(const char *confbase, const char *name, const char *appname, dev_class_t devclass, int netns);
+
+/// Debug function pointer variable for set port API
+/** This function pointer variable is a userspace tracepoint or debugger callback for
+ * set port function @a meshlink_set_port @a.
+ * On assigning a debug function variable invokes callback when try_bind() succeeds in meshlink_set_port API.
+ *
+ */
+extern void (*devtool_trybind_probe)(void);
+
+/// Debug function pointer variable for encrypted key rotate API
+/** This function pointer variable is a userspace tracepoint or debugger callback for
+ * encrypted key rotation function @a meshlink_encrypted_key_rotate @a.
+ * On assigning a debug function variable invokes callback for each stage from the key rotate API.
+ *
+ * @param stage Debug stage number.
+ */
+extern void (*devtool_keyrotate_probe)(int stage);
+
+/// Debug function pointer variable for asynchronous DNS resolving
+extern void (*devtool_adns_resolve_probe)(void);
+
+/// Debug function pointer variable for SPTPS key renewal
+/** This function pointer variable is a userspace tracepoint or debugger callback for
+ * SPTPS key renewal.
+ *
+ * @param node The node whose SPTPS key(s) are being renewed
+ */
+extern void (*devtool_sptps_renewal_probe)(meshlink_node_t *node);
+
+/// Force renewal of SPTPS sessions with the given node.
+/** This causes the SPTPS sessions for both the UDP and TCP connections to renew their keys.
+ *
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param node The node whose SPTPS key(s) should be renewed
+ */
+void devtool_force_sptps_renewal(meshlink_handle_t *mesh, meshlink_node_t *node);
+
+/// Debug function pointer variable for asserting inviter/invitee committing sequence
+/** This function pointer variable is a userspace tracepoint or debugger callback which
+ * invokes either after inviter writing invitees host file into the disk
+ * or after invitee writing it's main config file and host config files that inviter sent into
+ * the disk.
+ *
+ * @param inviter_commited_first true if inviter committed first else false if invitee committed first the other host file into the disk.
+ */
+extern void (*devtool_set_inviter_commits_first)(bool inviter_commited_first);
+
+/// Set the meta-connection status callback.
+/** This functions sets the callback that is called whenever a meta-connection is made or closed.
+ * 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.
+ *
+ * \memberof meshlink_handle
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param cb A pointer to the function which will be called when a node's meta-connection status changes.
+ * If a NULL pointer is given, the callback will be disabled.
+ */
+void devtool_set_meta_status_cb(struct meshlink_handle *mesh, meshlink_node_status_cb_t cb);