do not send periodic DIO messages if DAO registration is not done

Author: Mika Tervonen

source/RPL/rpl_upward.c

@@ -1666,6 +1666,10 @@ void rpl_upward_dio_timer(rpl_instance_t *instance, uint16_t ticks)
     if (rpl_dodag_am_leaf(dodag) && !instance->poison_count) {
         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;
         rpl_instance_dio_trigger(instance, NULL, NULL);