Suprress dio sending whenRPL is not yet ready

Dont send periodic DIOs
if there are no addresses generated
if address registration is ongoing

Author: Mika Tervonen

source/RPL/rpl_upward.c

@@ -1708,6 +1708,14 @@ 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;