Send new a/sd immediately after address change (#1576)

When new address is assigned to Thread BR it will:
 - cancel previous a/sd and a/as messages
 - send a/sd (Server Data Notification) immediately

Author: Arto Kinnunen

source/6LoWPAN/Thread/thread_bootstrap.c

@@ -1010,7 +1010,13 @@ void thread_tasklet(arm_event_s *event)
             thread_bootstrap_child_id_request(cur);
             if (thread_nd_own_service_list_data_size(&cur->thread_info->localServerDataBase)) {
                 // publish our services to allow leader to remove old ones
-                thread_border_router_publish(cur->id);
+                if (!cur->thread_info->localServerDataBase.publish_active) {
+                    /*
+                     * publish only when publish is not active, otherwise let resubmit timer check
+                     * handle publish after short time period.
+                     */
+                    thread_border_router_publish(cur->id);
+                }
             }
             thread_router_bootstrap_address_change_notify_send(cur);
             // Validate network data after a short period

source/6LoWPAN/Thread/thread_border_router_api.c

@@ -884,9 +884,16 @@ int thread_border_router_publish(int8_t interface_id)
     tr_debug("Border router old: %x, new: %x", cur->thread_info->localServerDataBase.registered_rloc16, rloc16);
 
     if (cur->thread_info->localServerDataBase.publish_active) {
-        cur->thread_info->localServerDataBase.publish_pending = true;
-        tr_debug("Activate pending status for publish");
-        return 0;
+        if (rloc16 != cur->thread_info->localServerDataBase.registered_rloc16) {
+            /*
+             * Device short address has changed, cancel previous a/sd and a/as requests
+             * */
+            thread_management_client_pending_coap_request_kill(cur->id);
+        } else {
+            cur->thread_info->localServerDataBase.publish_pending = true;
+            tr_debug("Activate pending status for publish");
+            return 0;
+        }
     }
 
     //Allocate Memory for Data