Update Pan information when it heard from Parent.

Change-Id: Id2494c996c304eae1bf1e2d39ea76d823de1befc

source/6LoWPAN/ws/ws_bootstrap.c

@@ -845,6 +845,7 @@ static void ws_bootstrap_pan_advertisement_analyse(struct protocol_interface_inf
 
     // Save route cost for all neighbours
     llc_neighbour_req_t neighbor_info;
+    neighbor_info.neighbor = NULL;
     if (ws_bootstrap_neighbor_info_request(cur, data->SrcAddr, &neighbor_info, false)) {
         neighbor_info.ws_neighbor->routing_cost = pan_information.routing_cost;
     }
@@ -921,12 +922,16 @@ static void ws_bootstrap_pan_advertisement_analyse(struct protocol_interface_inf
     ws_bootstrap_pan_advertisement_analyse_active(cur, &pan_information);
 
     // Learn latest network information
-    if (cur->bootsrap_mode != ARM_NWK_BOOTSRAP_MODE_6LoWPAN_BORDER_ROUTER) {
-        cur->ws_info->pan_information.pan_size = pan_information.pan_size;
-        cur->ws_info->pan_information.routing_cost = pan_information.routing_cost;
-        cur->ws_info->pan_information.rpl_routing_method = pan_information.rpl_routing_method;
-        cur->ws_info->pan_information.use_parent_bs = pan_information.use_parent_bs;
-        cur->ws_info->pan_information.version = pan_information.version;
+    if (cur->bootsrap_mode != ARM_NWK_BOOTSRAP_MODE_6LoWPAN_BORDER_ROUTER && neighbor_info.neighbor) {
+
+        if (neighbor_info.neighbor->link_role == PRIORITY_PARENT_NEIGHBOUR) {
+            cur->ws_info->pan_information.pan_size = pan_information.pan_size;
+            cur->ws_info->pan_information.routing_cost = pan_information.routing_cost;
+            cur->ws_info->pan_information.rpl_routing_method = pan_information.rpl_routing_method;
+            cur->ws_info->pan_information.use_parent_bs = pan_information.use_parent_bs;
+            cur->ws_info->pan_information.version = pan_information.version;
+        }
+
     }
 }