FreeOpcUa / python-opcua

    attrs = ua.DataTypeAttributes()

    attrs.Description = ua.LocalizedText(qname.Name)

    attrs.DisplayName = ua.LocalizedText(qname.Name)

    attrs.WriteMask = 0

    attrs.UserWriteMask = 0

    attrs.Historizing = 0

    attrs.IsAbstract = False  # True mean they cannot be instanciated

    addnode.NodeAttributes = attrs

    results = server.add_nodes([addnode])

    results[0].StatusCode.check()

    return results[0].AddedNodeId

def _create_method(parent, nodeid, qname, callback, inputs, outputs):

    addnode = ua.AddNodesItem()

    addnode.RequestedNewNodeId = nodeid

    addnode.BrowseName = qname

    addnode.NodeClass = ua.NodeClass.Method

    addnode.ParentNodeId = parent.nodeid

    addnode.ReferenceTypeId = ua.NodeId(ua.ObjectIds.HasComponent)

    #node.TypeDefinition = ua.NodeId(ua.ObjectIds.BaseObjectType)

    attrs = ua.MethodAttributes()

    attrs.Description = ua.LocalizedText(qname.Name)

    attrs.DisplayName = ua.LocalizedText(qname.Name)

    attrs.WriteMask = 0

    attrs.IsAbstract = False

    attrs.Description = ua.LocalizedText(qname.Name)

    attrs.DisplayName = ua.LocalizedText(qname.Name)

    attrs.WriteMask = 0

    attrs.UserWriteMask = 0

    addnode.NodeAttributes = attrs

    results = server.add_nodes([addnode])

    results[0].StatusCode.check()

    return results[0].AddedNodeId

def _to_variant(val, vtype=None):

    return _to_variant_with_datatype(val, vtype, datatype=None)[0]

def _to_variant_with_datatype(val, vtype=None, datatype=None):

    if isinstance(val, ua.Variant):

        if vtype:

            datatype = vtype

        return val, datatype

    else:

        return ua.Variant(val, vtype), datatype