Added check when weighting rule update must do network scan.

Network scan is only enabled if current network weighting is smaller than we support a rule when weighting has stringer rule than partition ID.

Change-Id: I1322e90f0e76425c97dfc189faa1f842695b2053

Author: Juha Heiskanen

source/6LoWPAN/Thread/thread_common.c

@@ -379,6 +379,9 @@ thread_leader_data_t *thread_leader_data_generate(void)
 {
     thread_leader_data_t *leader_data;
     leader_data = ns_dyn_mem_alloc(sizeof(thread_leader_data_t));
+    if (leader_data) {
+        memset(leader_data,0,sizeof(thread_leader_data_t));
+    }
     return leader_data;
 }
 

source/6LoWPAN/Thread/thread_management_if.c

@@ -62,6 +62,7 @@
 #include "6LoWPAN/Thread/thread_tmfcop_lib.h"
 #include "6LoWPAN/Thread/thread_constants.h"
 #include "6LoWPAN/Thread/thread_extension_bootstrap.h"
+#include "6LoWPAN/Thread/thread_extension.h"
 #include "6LoWPAN/Bootstraps/protocol_6lowpan.h"
 #include "RPL/rpl_control.h" // insanity - bootstraps shouldn't be doing each others' clean-up
 #include "MLE/mle.h"
@@ -1455,10 +1456,21 @@ int thread_management_partition_weighting_set(int8_t interface_id, uint8_t parti
         return 0;
     }
 
+    bool trig_network_scan = false;
+    if (cur->thread_info->thread_leader_data) {
+        if (cur->thread_info->thread_leader_data->weighting < partition_weighting) {
+            trig_network_scan = true;
+        }
+    }
+
     cur->thread_info->partition_weighting = partition_weighting;
+
     if (cur->lowpan_info & INTERFACE_NWK_ACTIVE) {
-        // bootstrap active and weighting has changed
-        thread_bootstrap_reset_restart(interface_id);
+        if (trig_network_scan && thread_extension_enabled(cur)) {
+            thread_nvm_store_link_info_clear();
+            // bootstrap active and weighting has changed
+            thread_bootstrap_reset_restart(interface_id);
+        }
     }
 
     return 0;