SyncNode has no add_variable_type()

[roin93]

Hello,
I was told to use the opcua-asyncio library instead of the old library.
The async functions give me a lot of headache, therefore I tried to use the sync wrapper from this library.
Many functions I know form the api of the old library are not working with this library despite the fact that somewhere it is mentions that most (!) of the api is the same.
For example I cannot add variable_types to a server.

Traceback (most recent call last):
File "main.py", line 276, in
main()
File "main.py", line 231, in main
datatype_node = server.get_node("i=93").add_variable_type("ns=3;i=6001", source_node.get_browse_name(), source_node.get_data_type())
AttributeError: 'SyncNode' object has no attribute 'add_variable_type'

Is there a wiki to check which functions are supported between the two libraries and which functions are only available in the async version of this library?

[oroulet]

this is open-source so there not many people wanting to spend time on doc. yes there are some methods missing here and there but the sync api is very very simple: just ad the name and args fo the missing function there:

opcua-asyncio/asyncua/sync.py

Line 454 in 84b4a60

pass

and it will work

[roin93]

I copy nodes from a Siemens OPCUA Server.
There is a Node "Par" which has 512 Components (Variables). But the Parent-Node ("Par") has also a Reference called "HasModellingRule":ExposesItsArray

Can you tell me how I can check if it is that kind or node? Currently I try to differentiate by evaluating the following expression

        elif node_class == NodeClass.Variable:
            values = child.get_value()
            # data_type = child.get_data_type()
            # check if it is variable or property
            if client.get_node(child.read_type_definition()).read_browse_name().to_string() == '0:PropertyType':
                try:
                    print("IS PROPERTY")
                    new_node = target_node.add_property(node_id, browse_name, values, datatype=data_type)
                except ua.UaStatusCodeError as e:
                    print("Error_Property:...", e)
                    # new_node = target_node.add_reference(node_id, "i=46")
            elif client.get_node(child.read_type_definition()).read_browse_name().to_string() == "0:BaseDataVariableType":
                try:
                    new_node = target_node.add_variable(node_id, browse_name, values, datatype=data_type)
                except ua.UaStatusCodeError as e:
                    print("Error:...", e)

                    #### HasComponent to this target_node. Then we should be fine with the tree.
                    new_node = target_node.add_reference(node_id, "i=47")
                    print("Added a reference")
            else:
                # some complex variable type...
                print("Normal variable...")
                print(client.get_node(child.read_type_definition()).read_browse_name().to_string())
                try:
                    new_node = target_node.add_variable(node_id, browse_name, values, datatype=data_type)
                except ua.UaStatusCodeError as e:
                    print("Error:...", e)

[AndreasHeine]

opcua-asyncio/asyncua/common/node.py

Line 378 in 84b4a60

async def get_references(self, refs=ua.ObjectIds.References, direction=ua.BrowseDirection.Both, nodeclassmask=ua.NodeClass.Unspecified, includesubtypes=True):

import asyncio
from asyncua import Client, ua

async def main():
    client = Client("opc.tcp://127.0.0.1:4840")
    await client.connect()
    refs = await client.get_node("ns=0;i=17635").get_references(refs=ua.ObjectIds.HasModellingRule)
    print(refs[0].DisplayName.Text) # for ref in refs -> check if "exposeitsarray"
    await client.disconnect()

asyncio.run(main())

C:\Users\andre\Desktop\Neuer Ordner>C:/Users/andre/AppData/Local/Programs/Python/Python37/python.exe "c:/Users/andre/Desktop/Neuer Ordner/client.py"
Optional

C:\Users\andre\Desktop\Neuer Ordner>

[roin93]

@oroulet

the sync api is very very simple: just ad the name and args fo the missing function there:

Can you also tell me how I can add something like server.address_space to the SyncServer?

[oroulet]

I do not understant. what is server.address_space?

[roin93]

server.address_space
I thought I could use that for some manipulation of the Server Node structure.

[roin93]

Added a pull request #515