+
+ /* Graphical explanation of how we get to the head of the
+ * footer in the following code
+ * <---------------------- payloadLen ------------------->
+ * -------------------------------------------------------
+ * linkest_header_t | payload | linkest_footer_t* ...|
+ * -------------------------------------------------------
+ * ^ ^ ^
+ * | | |
+ * subpayload | payloadEnd
+ * |
+ * payloadEnd - footersize*num footers
+ */
+