+extern bool meshlink_channel_aio_fd_send(struct meshlink_handle *mesh, struct meshlink_channel *channel, int fd, size_t len, meshlink_aio_fd_cb_t cb, void *priv);
+
+/// Receive data on a channel asynchronously
+/** This registers a buffer that will be filled with incoming channel data.
+ * Multiple buffers can be registered, in which case data will be received in the order the buffers were registered.
+ * While there are still buffers that have not been filled, the receive callback will not be called.
+ *
+ * \memberof meshlink_channel
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param channel A handle for the channel.
+ * @param data A pointer to a buffer that will be filled with incoming data.
+ * After meshlink_channel_aio_receive() returns, the buffer may not be modified or freed by the application
+ * until the callback routine is called.
+ * @param len The length of the data.
+ * @param cb A pointer to the function which will be called when MeshLink has finished using the buffer.
+ * @param priv A private pointer which is passed unchanged to the callback.
+ *
+ * @return True if the buffer was enqueued, false otherwise.
+ */
+extern bool meshlink_channel_aio_receive(struct meshlink_handle *mesh, struct meshlink_channel *channel, const void *data, size_t len, meshlink_aio_cb_t cb, void *priv);
+
+/// Receive data on a channel asynchronously and send it to a filedescriptor
+/** This will read up to the specified length number of bytes from the channel, and send it to the filedescriptor.
+ * The callback may be returned early if there is an error writing to the filedescriptor.
+ * While there is still unread data, the receive callback will not be called.
+ *
+ * \memberof meshlink_channel
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param channel A handle for the channel.
+ * @param fd A file descriptor to which data will be written.
+ * @param len The length of the data.
+ * @param cb A pointer to the function which will be called when MeshLink has finished using the filedescriptor.
+ * @param priv A private pointer which was set by the application when submitting the buffer.
+ *
+ * @return True if the buffer was enqueued, false otherwise.
+ */
+extern bool meshlink_channel_aio_fd_receive(struct meshlink_handle *mesh, struct meshlink_channel *channel, int fd, size_t len, meshlink_aio_fd_cb_t cb, void *priv);
+
+/// Get channel flags.
+/** This returns the flags used when opening this channel.
+ *
+ * \memberof meshlink_channel
+ * @param mesh A handle which represents an instance of MeshLink.
+ * @param channel A handle for the channel.
+ *
+ * @return The flags set for this channel.
+ */
+extern uint32_t meshlink_channel_get_flags(struct meshlink_handle *mesh, struct meshlink_channel *channel);
+
+/// 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);
+
+/// 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);
+
+/// 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);