Reset children when no response from parent (ARMmbed#1698)

Reset children if old parent does not respond to child_id_request.

Author: Arto Kinnunen

source/6LoWPAN/Thread/thread_host_bootstrap.c

@@ -1023,8 +1023,13 @@ static bool thread_child_id_req_timeout(int8_t interface_id, uint16_t msgId, boo
         ll64[8] ^= 2;
 
         entry_temp = mle_class_get_entry_by_ll64(cur->id, scanned_parent->linkMarginToParent, ll64, false, NULL);
-        if (entry_temp && !thread_check_is_this_my_parent(cur, entry_temp)) {
-            // remove scanned_parent entry only if it is not my parent
+        if (entry_temp) {
+            if (thread_check_is_this_my_parent(cur, entry_temp)) {
+                tr_debug("No parent resp - any-attach");
+                thread_bootstrap_connection_error(interface_id, CON_ERROR_NETWORK_ATTACH_FAIL, NULL);
+                goto exit;
+            }
+            // remove scanned_parent mle-entry as it was not my parent
             mle_class_remove_entry(cur->id, entry_temp);
         }
     }