pub unsafe extern "C" fn UA_Client_modifyAsyncCallback(
client: *mut UA_Client,
requestId: UA_UInt32,
userdata: *mut c_void,
callback: UA_ClientAsyncServiceCallback,
) -> UA_StatusCodepub unsafe extern "C" fn UA_Client_modifyAsyncCallback(
client: *mut UA_Client,
requestId: UA_UInt32,
userdata: *mut c_void,
callback: UA_ClientAsyncServiceCallback,
) -> UA_StatusCode