DIO advertisment fix

Wi-sun bootsratap rules was broke DIO advertisment aat error case when RANK start goes worster.

Change-Id: I776882bc5d5da7bb223825ed6a9236cfe7be9799

Author: Juha Heiskanen

source/RPL/rpl_upward.c

@@ -1833,17 +1833,21 @@ void rpl_upward_dio_timer(rpl_instance_t *instance, uint16_t ticks)
     if (rpl_dodag_am_leaf(dodag) && !instance->poison_count) {
         return;
     }
-    // We dont have any valid address in interface
-    if (ns_list_count(&instance->dao_targets) == 0) {
-        return;
-    }
-    /* Address registrations for parent ongoing*/
-    if (rpl_policy_parent_confirmation_requested() && instance->pending_neighbour_confirmation) {
-        return;
-    }
-    /* If we are waiting for DAO or DAO registration is needed we dont send periodic DIOs */
-    if (instance->dao_in_transit || instance->delay_dao_timer > 0) {
-        return;
+    /* Delay sending first DIO if we are still potentially gathering info */
+    /* Important to always send DIOs if we ever have sent any, so we can indicate problems to others */
+    if (!instance->last_advertised_dodag_version && rpl_policy_parent_confirmation_requested()) {
+        // We dont have any valid address in interface
+        if (ns_list_count(&instance->dao_targets) == 0) {
+            return;
+        }
+        /* Address registrations for parent ongoing*/
+        if (instance->pending_neighbour_confirmation) {
+            return;
+        }
+        /* If we are waiting for DAO or DAO registration is needed we dont send periodic DIOs */
+        if (instance->dao_in_transit || instance->delay_dao_timer > 0) {
+            return;
+        }
     }
     if (trickle_timer(&instance->dio_timer, &dodag->dio_timer_params, ticks)) {
         instance->dio_not_consistent = false;