Update ua_client_highlevel.h

include/ua_client_highlevel.h

@@ -275,7 +275,7 @@ UA_Client_Subscriptions_new(UA_Client *client, UA_SubscriptionSettings settings,
 UA_StatusCode UA_EXPORT
 UA_Client_Subscriptions_remove(UA_Client *client, UA_UInt32 subscriptionId);
 
-void UA_EXPORT UA_Client_Subscriptions_manuallySendPublishRequest(UA_Client *client);
+UA_StatusCode UA_EXPORT UA_Client_Subscriptions_manuallySendPublishRequest(UA_Client *client);
 
 UA_StatusCode UA_EXPORT
 UA_Client_Subscriptions_addMonitoredItem(UA_Client *client, UA_UInt32 subscriptionId,