Trying to instantiate optionals

[herculesp17]

This is how I instantiate my object in the server. so far so good.
`

instantiate objects in server

    self.device = await instantiate(await self.server.nodes.objects.get_child('3:Machines'),
                                    await self.server.nodes.base_object_type.get_child('4:WwMachineType'),
                                    bname = 'testServer_SA_OPCUA',
                                    dname = ua.LocalizedText('Dickenhobel'),
                                    idx = 4, instantiate_optional = False)`

but i want to add some optional children of the node type such as variables and properties. I just don't know how to get there.

[AndreasHeine]

instantiate_optional = True

[herculesp17]

yes but that instatiates all optionals; i don't want all of them though. I just want some specific ones.

[AndreasHeine]

thats currently not possible...

[schroeder-]

Delete the unwanted ones afterwards.

[herculesp17]

@schroeder- There are like 100 nodes more beeing instaniated than i actually want

[schroeder-]

You can make a pr for a extended interface if you want. Otherwise you can copy the code from instantiate and adapt it to your needs.

[AndreasHeine]

modify the instantiate method with another optional parameter (list of str) containing the browsenames of the childs to be instantiated? would be a cool new feature!

[herculesp17]

@AndreasHeine I agree

[herculesp17]

@schroeder- Can you tell me exactly how to do that? I tried the following, but it didn't work. My programming skills are not very good, yet and it's hard for me to understand the documention perfectly.

self.device = await instantiate(await self.device, ua.NodeIdType(3), ua.NodeId('ns=1;i=6028'), bname = '4:Location', dname = 'Biel', idx = 4, instantiate_optional = False)

[schroeder-]

Started a pr #1328, this is missing a test.
self.device = await instantiate(await self.device, ua.NodeIdType(3), ua.NodeId('ns=1;i=6028'), bname = '4:Location', dname = 'Biel', idx = 4, instantiate_optional_list=["Optional1", ua.QualifiedName("Optional2", 3)])