extern void update_node_pmtu(meshlink_handle_t *mesh, struct node_t *n);
extern meshlink_log_level_t global_log_level;
extern meshlink_log_cb_t global_log_cb;
-extern int check_port(meshlink_handle_t *mesh);
extern void handle_duplicate_node(meshlink_handle_t *mesh, struct node_t *n);
extern void handle_network_change(meshlink_handle_t *mesh, bool online);