+ /// Export the local node's key and addresses.
+ /** This function generates a string that contains the local node's public key and one or more IP addresses.
+ * The application can pass it in some way to another node, which can then import it,
+ * granting the local node access to the other node's mesh.
+ *
+ * @return This function returns a string that contains the exported key and addresses.
+ * The application should call free() after it has finished using this string.
+ */
+ char *export_key() {
+ return meshlink_export(handle);
+ }
+
+ /// Import another node's key and addresses.
+ /** This function accepts a string containing the exported public key and addresses of another node.
+ * By importing this data, the local node grants the other node access to its mesh.
+ *
+ * @param data A string containing the other node's exported key and addresses.
+ *
+ * @return This function returns true if the data was valid and the other node has been granted access to the mesh, false otherwise.
+ */
+ bool import_key(const char *data) {
+ return meshlink_import(handle, data);
+ }
+
+ /// Blacklist a node from the mesh.
+ /** This function causes the local node to blacklist another node.
+ * The local node will drop any existing connections to that node,
+ * and will not send data to it nor accept any data received from it any more.
+ *
+ * @param node A pointer to a meshlink::node describing the node to be blacklisted.
+ */
+ void blacklist(node *node) {
+ return meshlink_blacklist(handle, node);
+ }
+
+ /// Set the poll callback.
+ /** This functions sets the callback that is called whenever data can be sent to another node.
+ * The callback is run in MeshLink's own thread.
+ * It is therefore important that the callback uses apprioriate methods (queues, pipes, locking, etc.)
+ * to pass data to or from the application's thread.
+ * The callback should also not block itself and return as quickly as possible.
+ *
+ * @param channel A handle for the channel.
+ * @param cb A pointer to the function which will be called when data can be sent to another node.
+ * If a NULL pointer is given, the callback will be disabled.
+ */
+ void set_channel_poll_cb(channel *channel, channel_poll_cb_t cb) {
+ meshlink_set_channel_poll_cb(handle, channel, (meshlink_channel_poll_cb_t)cb);
+ }
+
+ /// Set the send buffer size of a channel.
+ /** This function sets the desired size of the send buffer.
+ * The default size is 128 kB.
+ *
+ * @param channel A handle for the channel.
+ * @param size The desired size for the send buffer.
+ * If a NULL pointer is given, the callback will be disabled.
+ */
+ void set_channel_sndbuf(channel *channel, size_t size) {
+ meshlink_set_channel_sndbuf(handle, channel, size);
+ }
+
+ /// Set the receive buffer size of a channel.
+ /** This function sets the desired size of the receive buffer.
+ * The default size is 128 kB.
+ *
+ * @param channel A handle for the channel.
+ * @param size The desired size for the send buffer.
+ * If a NULL pointer is given, the callback will be disabled.
+ */
+ void set_channel_rcvbuf(channel *channel, size_t size) {
+ meshlink_set_channel_rcvbuf(handle, channel, size);
+ }
+
+ /// Open a reliable stream channel to another node.
+ /** This function is called whenever a remote node wants to open a channel to the local node.
+ * The application then has to decide whether to accept or reject this channel.
+ *
+ * This function sets the channel poll callback to channel_poll_trampoline, which in turn
+ * calls channel_poll. To set a different, channel-specific poll callback, use set_channel_poll_cb.
+ *
+ * @param node The node to which this channel is being initiated.
+ * @param port The port number the peer wishes to connect to.
+ * @param cb A pointer to the function which will be called when the remote node sends data to the local node.
+ * @param data A pointer to a buffer containing data to already queue for sending.
+ * @param len The length of the data.
+ * @param flags A bitwise-or'd combination of flags that set the semantics for this channel.
+ *
+ * @return A handle for the channel, or NULL in case of an error.
+ */
+ channel *channel_open(node *node, uint16_t port, channel_receive_cb_t cb, const void *data, size_t len, uint32_t flags = channel::TCP) {
+ channel *ch = (channel *)meshlink_channel_open_ex(handle, node, port, (meshlink_channel_receive_cb_t)cb, data, len, flags);
+ meshlink_set_channel_poll_cb(handle, ch, &channel_poll_trampoline);
+ return ch;
+ }
+
+ /// Open a reliable stream channel to another node.
+ /** This function is called whenever a remote node wants to open a channel to the local node.
+ * The application then has to decide whether to accept or reject this channel.
+ *
+ * This function sets the channel receive callback to channel_receive_trampoline,
+ * which in turn calls channel_receive.
+ *
+ * This function sets the channel poll callback to channel_poll_trampoline, which in turn
+ * calls channel_poll. To set a different, channel-specific poll callback, use set_channel_poll_cb.
+ *
+ * @param node The node to which this channel is being initiated.
+ * @param port The port number the peer wishes to connect to.
+ * @param data A pointer to a buffer containing data to already queue for sending.
+ * @param len The length of the data.
+ * @param flags A bitwise-or'd combination of flags that set the semantics for this channel.
+ *
+ * @return A handle for the channel, or NULL in case of an error.
+ */
+ channel *channel_open(node *node, uint16_t port, const void *data, size_t len, uint32_t flags = channel::TCP) {
+ channel *ch = (channel *)meshlink_channel_open_ex(handle, node, port, &channel_receive_trampoline, data, len, flags);
+ meshlink_set_channel_poll_cb(handle, ch, &channel_poll_trampoline);
+ return ch;
+ }
+
+ /// Partially close a reliable stream channel.
+ /** This shuts down the read or write side of a channel, or both, without closing the handle.
+ * It can be used to inform the remote node that the local node has finished sending all data on the channel,
+ * but still allows waiting for incoming data from the remote node.
+ *
+ * @param channel A handle for the channel.
+ * @param direction Must be one of SHUT_RD, SHUT_WR or SHUT_RDWR.
+ */
+ void channel_shutdown(channel *channel, int direction) {
+ return meshlink_channel_shutdown(handle, channel, direction);
+ }
+
+ /// Close a reliable stream channel.
+ /** This informs the remote node that the local node has finished sending all data on the channel.
+ * It also causes the local node to stop accepting incoming data from the remote node.
+ * Afterwards, the channel handle is invalid and must not be used any more.
+ *
+ * @param channel A handle for the channel.
+ */
+ void channel_close(meshlink_channel_t *channel) {
+ return meshlink_channel_close(handle, channel);
+ }
+
+ /// Transmit data on a channel
+ /** This queues data to send to the remote node.
+ *
+ * @param channel A handle for the channel.
+ * @param data A pointer to a buffer containing data sent by the source.
+ * @param len The length of the data.
+ *
+ * @return The amount of data that was queued, which can be less than len, or a negative value in case of an error.
+ * If MESHLINK_CHANNEL_NO_PARTIAL is set, then the result will either be len,
+ * 0 if the buffer is currently too full, or -1 if len is too big even for an empty buffer.
+ */
+ ssize_t channel_send(channel *channel, void *data, size_t len) {
+ return meshlink_channel_send(handle, channel, data, len);
+ }
+
+ /// Transmit data on a channel asynchronously
+ /** This registers a buffer that will be used to send data to the remote node.
+ * Multiple buffers can be registered, in which case data will be sent in the order the buffers were registered.
+ * While there are still buffers with unsent data, the poll callback will not be called.
+ *
+ * @param channel A handle for the channel.
+ * @param data A pointer to a buffer containing data sent by the source, or NULL if there is no data to send.
+ * After meshlink_channel_aio_send() 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, or 0 if there is no data to send.
+ * @param cb A pointer to the function which will be called when MeshLink has finished using the buffer.
+ *
+ * @return True if the buffer was enqueued, false otherwise.
+ */
+ bool channel_aio_send(channel *channel, const void *data, size_t len, meshlink_aio_cb_t cb, void *priv) {
+ return meshlink_channel_aio_send(handle, channel, data, len, cb, 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.
+ *
+ * @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.
+ *
+ * @return True if the buffer was enqueued, false otherwise.
+ */
+ bool channel_aio_receive(channel *channel, const void *data, size_t len, meshlink_aio_cb_t cb, void *priv) {
+ return meshlink_channel_aio_receive(handle, channel, data, len, cb, priv);
+ }
+
+ /// 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.
+ *
+ * @param channel A handle for the channel.
+ *
+ * @return The amount of un-ACKed bytes in the send buffer.
+ */
+ size_t channel_get_sendq(channel *channel) {
+ return meshlink_channel_get_sendq(handle, 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.
+ *
+ * @param channel A handle for the channel.
+ *
+ * @return The amount of bytes in the receive buffer.
+ */
+ size_t channel_get_recvq(channel *channel) {
+ return meshlink_channel_get_recvq(handle, channel);
+ }
+
+ /// 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.
+ *
+ * @param enable Set to true to enable discovery, false to disable.
+ */
+ void enable_discovery(bool enable = true) {
+ meshlink_enable_discovery(handle, enable);
+ }
+
+private:
+ // non-copyable:
+ mesh(const mesh &) /* TODO: C++11: = delete */;
+ void operator=(const mesh &) /* TODO: C++11: = delete */;
+
+ /// static callback trampolines:
+ static void receive_trampoline(meshlink_handle_t *handle, meshlink_node_t *source, const void *data, size_t length) {
+ if(!(handle->priv)) {
+ return;