Do not send data if we are connected, send it only once we actually are

src/network/socket_handler.hpp

@@ -51,6 +51,10 @@ public:
    * notified when a send event is ready.
    */
   void send_data(std::string&& data);
+  /**
+   * Watch the socket for send events, if our out buffer is not empty.
+   */
+  void send_pending_data();
   /**
    * Returns the socket that should be handled by the poller.
    */