Check status of sent messages.

include/neocomm.h

@@ -47,6 +47,15 @@ struct message {
 	struct user from; ///< Info on the peer who sent the message.
 };
 
+/**
+ * @brief Status of a message.
+ */
+enum {
+	NC_PENDING  = 1, ///< Status of message is pending.
+	NC_GOOD     = 2, ///< Message was sent properly.
+	NC_BAD      = 3, ///< Message failed to send.
+};
+
 /**
  * @brief Initialize a local DHT node. If port is 0 then the default port
  * number will be used.
@@ -137,10 +146,23 @@ void NeoComm_free_message(struct message *msg);
  * @param channel_name Name of the channel to send the message to.
  * @param message A message to send to the channel.
  *
- * @return 1 upon success, 0 upon failure. Use NeoComm_get_last_error for a
- * text description of the error.
+ * @return Upon success it returns the time that the message was sent which
+ * can be used as a token to see if the message was sent properly using
+ * NeoComm_check_message, if the function failed then 0 will be returned.
  */
-int NeoComm_send_message(const char *channel_name, const char *message);
+time_t NeoComm_send_message(const char *channel_name, const char *message);
+
+/**
+ * @brief Check the status of a sent message.
+ *
+ * @param token The token of a message to check its status.
+ *
+ * @return The status of the message (NC_GOOD, NC_BAD, or NC_PENDING). If the
+ * token does not exist then 0 is returned.
+ *
+ * @warning Once checked the token becomes invalid.
+ */
+int NeoComm_check_message(const time_t token);
 
 /**
  * @brief Get the last error that occurred in text.