From 59e8d059c265c5487f23a2520a6d6ed44c6cd5fd Mon Sep 17 00:00:00 2001
From: Simon Duquennoy <simon.duquennoy@ri.se>
Date: Fri, 18 May 2018 05:52:33 -0700
Subject: [PATCH] RPL: print links at root periodically

---
 os/net/routing/rpl-lite/rpl-dag-root.c | 23 +++++++++++++++++++++++
 os/net/routing/rpl-lite/rpl-dag-root.h |  6 ++++++
 os/net/routing/rpl-lite/rpl-timers.c   |  1 +
 3 files changed, 30 insertions(+)

diff --git a/os/net/routing/rpl-lite/rpl-dag-root.c b/os/net/routing/rpl-lite/rpl-dag-root.c
index 0d5cebe92..c96fd6656 100644
--- a/os/net/routing/rpl-lite/rpl-dag-root.c
+++ b/os/net/routing/rpl-lite/rpl-dag-root.c
@@ -42,12 +42,35 @@
 
 #include "net/routing/rpl-lite/rpl.h"
 #include "net/ipv6/uip-ds6-route.h"
+#include "net/ipv6/uip-sr.h"
 
 /* Log configuration */
 #include "sys/log.h"
 #define LOG_MODULE "RPL"
 #define LOG_LEVEL LOG_LEVEL_RPL
 
+/*---------------------------------------------------------------------------*/
+void
+rpl_dag_root_print_links(const char *str)
+{
+  if(rpl_dag_root_is_root()) {
+    if(uip_sr_num_nodes() > 0) {
+      uip_sr_node_t *link;
+      /* Our routing links */
+      LOG_INFO("links: %u routing links in total (%s)\n", uip_sr_num_nodes(), str);
+      link = uip_sr_node_head();
+      while(link != NULL) {
+        char buf[100];
+        uip_sr_link_snprint(buf, sizeof(buf), link);
+        LOG_INFO("links: %s\n", buf);
+        link = uip_sr_node_next(link);
+      }
+      LOG_INFO("links: end of list\n");
+    } else {
+      LOG_INFO("No routing links\n");
+    }
+  }
+}
 /*---------------------------------------------------------------------------*/
 static void
 set_global_address(uip_ipaddr_t *prefix, uip_ipaddr_t *iid)
diff --git a/os/net/routing/rpl-lite/rpl-dag-root.h b/os/net/routing/rpl-lite/rpl-dag-root.h
index af0048c4d..71b999765 100644
--- a/os/net/routing/rpl-lite/rpl-dag-root.h
+++ b/os/net/routing/rpl-lite/rpl-dag-root.h
@@ -63,6 +63,12 @@ int rpl_dag_root_start(void);
  * \return 1 if we are dag root, 0 otherwise
 */
 int rpl_dag_root_is_root(void);
+/**
+ * Prints a summary of all routing links
+ *
+ * \param str A descriptive text on the caller
+*/
+void rpl_dag_root_print_links(const char *str);
 
  /** @} */
 
diff --git a/os/net/routing/rpl-lite/rpl-timers.c b/os/net/routing/rpl-lite/rpl-timers.c
index 6fb00ca17..c41b92948 100644
--- a/os/net/routing/rpl-lite/rpl-timers.c
+++ b/os/net/routing/rpl-lite/rpl-timers.c
@@ -521,6 +521,7 @@ handle_periodic_timer(void *ptr)
 
   if(LOG_INFO_ENABLED) {
     rpl_neighbor_print_list("Periodic");
+    rpl_dag_root_print_links("Periodic");
   }
 
   ctimer_reset(&periodic_timer);