+#ifdef CONFIG_DFU_TIMEOUT
+static unsigned long dfu_timeout = 0;
+#endif
+
+/*
+ * The purpose of the dfu_flush_callback() function is to
+ * provide callback for dfu user
+ */
+__weak void dfu_flush_callback(struct dfu_entity *dfu)
+{
+}
+
+/*
+ * The purpose of the dfu_initiated_callback() function is to
+ * provide callback for dfu user
+ */
+__weak void dfu_initiated_callback(struct dfu_entity *dfu)
+{
+}