Importing OPCUA.Di

[roin93]

Hello,

I tried to import the OPCUA.Di Models and Nodes from https://opcfoundation.org/UA/schemas/DI/1.2/

server.import_xml("Opc.Ua.Di.NodeSet2.xml")
server.import_xml("OpcUaDiModel.xml")

Right at the beginning I get an Error that something is missing. Do I need to Import something else first?

WARNING:asyncua.common.xmlparser:Parsing value of type 'QualifiedName' not implemented
WARNING:asyncua.client.ua_client.UaClient:close_session was called but connection is closed
WARNING:asyncua.client.ua_client.UaClient:close_secure_channel was called but connection is closed
WARNING:asyncua.client.ua_client.UaClient:disconnect_socket was called but connection is closed
Traceback (most recent call last):
File "main.py", line 272, in
main()
File "main.py", line 210, in main
server.import_xml("OpcUaDiModel.xml")
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/site-packages/asyncua-0.9.14-py3.7.egg/asyncua/sync.py", line 94, in wrapper
result = self.tloop.post(aio_func(*args, **kwargs))
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/site-packages/asyncua-0.9.14-py3.7.egg/asyncua/sync.py", line 52, in post
return futur.result()
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/concurrent/futures/_base.py", line 435, in result
return self.__get_result()
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/concurrent/futures/_base.py", line 384, in __get_result
raise self._exception
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/site-packages/asyncua-0.9.14-py3.7.egg/asyncua/server/server.py", line 562, in import_xml
return await importer.import_xml(path, xmlstring)
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/site-packages/asyncua-0.9.14-py3.7.egg/asyncua/common/xmlimporter.py", line 101, in import_xml
dnodes = self.parser.get_node_datas()
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/site-packages/asyncua-0.9.14-py3.7.egg/asyncua/common/xmlparser.py", line 166, in get_node_datas
node = self._parse_node(tag, child)
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/site-packages/asyncua-0.9.14-py3.7.egg/asyncua/common/xmlparser.py", line 181, in _parse_node
self._parse_attr(el, obj)
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/site-packages/asyncua-0.9.14-py3.7.egg/asyncua/common/xmlparser.py", line 224, in _parse_attr
self._parse_refs(el, obj)
File "/home/msauser/.conda/envs/opcua_test/lib/python3.7/site-packages/asyncua-0.9.14-py3.7.egg/asyncua/common/xmlparser.py", line 372, in _parse_refs
struct.reftype = ref.attrib["ReferenceType"]
KeyError: 'ReferenceType'
ERROR:asyncio:Task was destroyed but it is pending!
task: <Task pending coro=<Client._renew_channel_loop() running at /home/msauser/.conda/envs/opcua_test/lib/python3.7/site-packages/asyncua-0.9.14-py3.7.egg/asyncua/client/client.py:398> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x7feaa9943510>()]>>

I started building an opcua aggregator for servers generated by siemens plcs. Therefore I need to import plenty of DataTypes and such.

Would be nice if someone knows that problem and can point me to the right files...

[swamper123]

The Opc.Ua.Di.NodeSet2.xml File from here:
https://github.com/OPCFoundation/UA-Nodeset/tree/v1.04/DI

This imports the DI spec.

The second file you import (seems to be a self made one from you?), seems to miss a ReferenceType for a Reference in the xml-File. This blows things up.

[roin93]

As you saw, I am using python 3.7.

The relevant part of the code is lookig as following:

import logging
import asyncio
from asyncua.sync import Client
from asyncua.sync import Server as opcuaServer
from asyncua import ua
import socket
import threading
import time

from asyncua.ua import NodeClass, LocalizedText, QualifiedName
from asyncua.sync import ThreadLoop

def main():
    logging.basicConfig(level=logging.WARN)
    # logger = logging.getLogger("KeepAlive")
    # logger.setLevel(logging.DEBUG)
    address = "opc.tcp://192.168.178.2:4840"
    # client = Client("opc.tcp://localhost:4840/freeopcua/server/")
    with ThreadLoop() as tloop:
        with Client(address, tloop=tloop) as client:
            # client = Client("opc.tcp://admin@localhost:4840/freeopcua/server/") #connect using a user

            # eigenen server starten
            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            s.connect(("8.8.8.8", 80))
            ip_addr = s.getsockname()[0]

            server = opcuaServer(tloop=tloop)
            server.set_endpoint("opc.tcp://%s:4840/opcua/" % ip_addr)
            server.set_server_name("OwnServer")
            print("server online")

            try:
                client.connect()

                # Client has a few methods to get proxy to UA nodes that should always be in address space such as Root or Objects
                # root = client.get_root_node()
                root = client.nodes.root
                print("Root node is: ", root)
                # objects = client.get_objects_node()
                objects = client.nodes.objects
                print("Objects node is: ", objects)

                # Node objects have methods to read and write node attributes as well as browse or populate address space
                children = root.get_children()
                print("Children of root are: ", children)

                # server_root = server.get_root_node()
                server_root = server.nodes.root
                # server_objects = server.get_objects_node()
                server_objects = server.nodes.objects

                # Namespaces
                # 0: Default opcua namespace http://opcfoundation.org/UA/
                # 1: freeopcua / urn:freeopcua:python:server
                # 2: opcua.di http://opcfoundation.org/UA/DI/
                # 3: simatic http://www.siemens.com/simatic-s7-opcua

                # Add Datatype of the opcua.di specs

                if True: # Im just testing out different parts of the code and use this kind for disabling blocks. If I comment it out, I will remove it...
                    print("Importing opcua.di")
                    server.import_xml("Opc.Ua.Di.NodeSet2.xml")
                    # server.import_xml("OpcUaDiModel.xml")

                    print("Imported opcua.di")
                else:
                    server.register_namespace("http://opcfoundation.org/UA/DI/")

                # Some other stuff...
if __name__ == "__main__":
    main()

The file is located in the same folder as my main.py

[swamper123]

I am not very familiar with Threadloop (and the whole sync stuff, I just know that it exist).
I think you are missing server.init() (after server = opcuaServer(tloop=tloop)) as well?

Still wondering why the parser has a problem to parse this xml file ....

[roin93]

The init function for the (sync) Server class does not exist. Therefore I guess it is not needed, besides the fact I never used it.

I currently parsing my old xml file, just getting the Warning, that parsing QualifiedName is not implemented.

[roin93]

The mentioned warning is WARNING:asyncua.common.xmlparser:Parsing value of type 'QualifiedName' not implemented when I try to use server.import_xml(my_linked_xml).
When I try to load the file you mentioned I get the other errors I cannot work around at the moment.

[swamper123]

The init function for the (sync) Server class does not exist. Therefore I guess it is not needed, besides the fact I never used it.

You are right. It is already executed in the init:

opcua-asyncio/asyncua/sync.py

Line 248 in 0a1cce0

self.tloop.post(self.aio_obj.init(shelf_file))

The mentioned warning is WARNING:asyncua.common.xmlparser:Parsing value of type 'QualifiedName' not implemented

Yes, that is correct, we have some missing values:

opcua-asyncio/asyncua/common/xmlparser.py

Line 304 in 0a1cce0

else:

            # Missing according to string_to_val: XmlElement, ExpandedNodeId,
            # QualifiedName, StatusCode.
            # Missing according to ua.VariantType (also missing in string_to_val):
            # DataValue, Variant, DiagnosticInfo.

@oroulet Do you know, if we support some of these mentioned values now? Git Blame says, it's a while ago since somebody touched these lines. If yes, we may provide an update on that.