Function UA_Client_addVariableTypeNode_async 

pub unsafe extern "C" fn UA_Client_addVariableTypeNode_async(
    client: *mut UA_Client,
    requestedNewNodeId: UA_NodeId,
    parentNodeId: UA_NodeId,
    referenceTypeId: UA_NodeId,
    browseName: UA_QualifiedName,
    attr: UA_VariableTypeAttributes,
    outNewNodeId: *mut UA_NodeId,
    callback: UA_ClientAsyncAddNodesCallback,
    userdata: *mut c_void,
    reqId: *mut UA_UInt32,
) -> UA_StatusCode