+extern uint32_t meshlink_channel_get_flags(struct meshlink_handle *mesh, struct meshlink_channel *channel) __attribute__((__warn_unused_result__));
+
+/// Get the amount of bytes in the send buffer.
+/** This returns the amount of bytes in the send buffer.
+ * These bytes have not been received by the peer yet.
+ *
+ * \memberof meshlink_channel
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param channel A handle for the channel.
+ *
+ * @return The amount of un-ACKed bytes in the send buffer.
+ */
+extern size_t meshlink_channel_get_sendq(struct meshlink_handle *mesh, struct meshlink_channel *channel) __attribute__((__warn_unused_result__));
+
+/// Get the amount of bytes in the receive buffer.
+/** This returns the amount of bytes in the receive buffer.
+ * These bytes have not been processed by the application yet.
+ *
+ * \memberof meshlink_channel
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param channel A handle for the channel.
+ *
+ * @return The amount of bytes in the receive buffer.
+ */
+extern size_t meshlink_channel_get_recvq(struct meshlink_handle *mesh, struct meshlink_channel *channel) __attribute__((__warn_unused_result__));
+
+/// Get the maximum segment size of a channel.
+/** This returns the amount of bytes that can be sent at once for channels with UDP semantics.
+ *
+ * \memberof meshlink_channel
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param channel A handle for the channel.
+ *
+ * @return The amount of bytes in the receive buffer.
+ */
+extern size_t meshlink_channel_get_mss(struct meshlink_handle *mesh, struct meshlink_channel *channel) __attribute__((__warn_unused_result__));
+
+/// Set the connection timeout used for channels to the given node.
+/** This sets the timeout after which unresponsive channels will be reported as closed.
+ * The timeout is set for all current and future channels to the given node.
+ *
+ * \memberof meshlink_node
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param channel A handle for the channel.
+ * @param timeout The timeout in seconds after which unresponsive channels will be reported as closed.
+ * The default is 60 seconds.
+ */
+extern void meshlink_set_node_channel_timeout(struct meshlink_handle *mesh, struct meshlink_node *node, int timeout);
+
+/// Hint that a hostname may be found at an address
+/** This function indicates to meshlink that the given hostname is likely found
+ * at the given IP address and port.
+ *
+ * \memberof meshlink_node
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param node A pointer to a struct meshlink_node describing the node to add the address hint for.
+ * @param addr The IP address and port which should be tried for the
+ * given hostname. The caller is free to overwrite or free
+ * this memory once meshlink returns.
+ */
+extern void meshlink_hint_address(struct meshlink_handle *mesh, struct meshlink_node *node, const struct sockaddr *addr);
+
+/// Enable or disable zeroconf discovery of local peers
+/** This controls whether zeroconf discovery using the Catta library will be
+ * enabled to search for peers on the local network. By default, it is enabled.
+ *
+ * \memberof meshlink_handle
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param enable Set to true to enable discovery, false to disable.
+ */
+extern void meshlink_enable_discovery(struct meshlink_handle *mesh, bool enable);
+
+/// Performs key rotation for an encrypted storage
+/** This rotates the (master) key for an encrypted storage and discards the old key
+ * if the call succeeded. This is an atomic call.
+ *
+ * \memberof meshlink_handle
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param key A pointer to the new key used to encrypt storage.
+ * @param keylen The length of the new key in bytes.
+ *
+ * @return This function returns true if the key rotation for the encrypted storage succeeds, false otherwise.
+ */
+extern bool meshlink_encrypted_key_rotate(struct meshlink_handle *mesh, const void *key, size_t keylen) __attribute__((__warn_unused_result__));
+
+/// Set device class timeouts
+/** This sets the ping interval and timeout for a given device class.
+ *
+ * \memberof meshlink_handle
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param devclass The device class to update
+ * @param pinginterval The interval between keepalive packets, in seconds. The default is 60.
+ * @param pingtimeout The required time within which a peer should respond, in seconds. The default is 5.
+ * The timeout must be smaller than the interval.
+ */
+extern void meshlink_set_dev_class_timeouts(struct meshlink_handle *mesh, dev_class_t devclass, int pinginterval, int pingtimeout);
+
+/// Set device class fast retry period
+/** This sets the fast retry period for a given device class.
+ * During this period after the last time the mesh becomes unreachable, connections are tried once a second.
+ *
+ * \memberof meshlink_handle
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param devclass The device class to update
+ * @param fast_retry_period The period during which fast connection retries are done. The default is 0.
+ */
+extern void meshlink_set_dev_class_fast_retry_period(struct meshlink_handle *mesh, dev_class_t devclass, int fast_retry_period);
+
+/// Set which order invitations are committed
+/** This determines in which order configuration files are written to disk during an invitation.
+ * By default, the invitee saves the configuration to disk first, then the inviter.
+ * By calling this function with @a inviter_commits_first set to true, the order is reversed.
+ *
+ * \memberof meshlink_handle
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param inviter_commits_first If true, then the node that invited a peer will commit data to disk first.
+ */
+extern void meshlink_set_inviter_commits_first(struct meshlink_handle *mesh, bool inviter_commits_first);
+
+/// Set the URL used to discover the host's external address
+/** For generating invitation URLs, MeshLink can look up the externally visible address of the local node.
+ * It does so by querying an external service. By default, this is http://meshlink.io/host.cgi.
+ * Only URLs starting with http:// are supported.
+ *
+ * \memberof meshlink_handle
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param url The URL to use for external address queries, or NULL to revert back to the default URL.
+ */
+extern void meshlink_set_external_address_discovery_url(struct meshlink_handle *mesh, const char *url);
+
+/// Set the scheduling granularity of the application
+/** This should be set to the effective scheduling granularity for the application.
+ * This depends on the scheduling granularity of the operating system, the application's
+ * process priority and whether it is running as realtime or not.
+ * The default value is 10000 (10 milliseconds).
+ *
+ * \memberof meshlink_handle
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param granularity The scheduling granularity of the application in microseconds.
+ */
+extern void meshlink_set_scheduling_granularity(struct meshlink_handle *mesh, long granularity);