Connecting Siemens WinCC Server with Python FreeOPCUA to suscribe for events

[rajnishnationfirst]

Connecting Siemens WinCC Server with Python FreeOPCUA to suscribe for events

Hi everyone,

I am using FreeOPCUA Python SDK for connecting to Siemens WinCC Server and suscribing to events . By default i am suscribing to Server Node & BaseEventType using As per FreeOPC UA Python SDK , the below code suscribe's to All events at "Server"-node and"BaseEventType" -node by default:

eventSubscription = subscription.subscribe_events().

Also i am and suscribing through root.get_child(....) using browse path.

` # 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() print("Objects node is: ", root)

    # Now getting a variable node using its browse path
    obj = root.get_child(["0:Objects","0:Server"])
    print("MyObject is: ", obj)

    myevent = root.get_child(["0:Types", "0:EventTypes", "0:BaseEventType"])
    print("MyFirstEventType is: ", myevent)

   msclt = SubHandler()
    sub = client.create_subscription(1000, msclt)
    handle = sub.subscribe_events(obj, myevent)

    embed()
    sub.unsubscribe(handle)
    sub.delete()****`

I am able to connect but i am not able to suscribe to the events and getting errors as : Error: opc.tcp://EC2AMAZ-VJQV23P:4862 opc.tcp MessageSecurityMode.None MessageSecurityMode.None http://opcfoundation.org/UA/SecurityPolicy#None http://opcfoundation.org/UA/SecurityPolicy#None

Requested session timeout to be 3600000ms, got 300000ms instead ServiceFault from server received while waiting for publish response

Traceback (most recent call last): File "C:\Users\WinCC\Desktop\Wincc sms project\SDK FILES\Events_Test.py", line 25, in eventSubscription = subscription.subscribe_events() File "C:\Users\WinCC\AppData\Local\Programs\Python\Python38-32\lib\site-packages\opcua\common\subscription.py", line 212, in subscribe_events return self._subscribe(sourcenode, ua.AttributeIds.EventNotifier, evfilter, queuesize=queuesize) File "C:\Users\WinCC\AppData\Local\Programs\Python\Python38-32\lib\site-packages\opcua\common\subscription.py", line 230, in _subscribe mids[0].check() File "C:\Users\WinCC\AppData\Local\Programs\Python\Python38-32\lib\site-packages\opcua\ua\uatypes.py", line 218, in check raise UaStatusCodeError(self.value) opcua.ua.uaerrors._auto.BadMonitoredItemFilterInvalid: The monitored item filter parameter is not valid.(BadMonitoredItemFilterInvalid)

Attachements of WinCC View Tree Nodes & Issue of Python OPC UA Client getting from WinCC:

Code Files For Review : 3 Code Files Tested .

client-events_1.txt client-events_2.txt client-events_3.txt

Request anyonw on how can i suscribe to events on WinCC without errors.

[AndreasHeine]

Hey, i tested your code against the event example from python-opcua client.py.txt server.py.txt

it works! so the error tells you about a timeout what is the server timeout set to?

[rajnishnationfirst]

Thanks AndreasHeine , for your reply.

We have sorted the TimeOut Issue on the server side and set the timeout to 3000000ms to match the OPCUA Client Python SDK Program in the opcua client.py file ( we have set timeout here as 3000000ms) ( Pls check all screenshots .

Also could you pls assit me on what configurations you have done on server side ( configurations ) and client side ( python opcUa SDK Settings in client.py file ) to make the client working for suscribing events with FreeOPCUA Python Client

Pls check all screenshots .

But we are still getting the below error :

Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license()" for more information.

== RESTART: C:\Users\WinCC\Desktop\Wincc sms project\SDK FILES\EventsTest.py == opc.tcp://EC2AMAZ-VJQV23P:4862 opc.tcp MessageSecurityMode.None MessageSecurityMode.None_ http://opcfoundation.org/UA/SecurityPolicy#None http://opcfoundation.org/UA/SecurityPolicy#None ServiceFault from server received while waiting for publish response Traceback (most recent call last): File "C:\Users\WinCC\Desktop\Wincc sms project\SDK FILES\Events_Test.py", line 25, in eventSubscription = subscription.subscribe_events() File "C:\Users\WinCC\AppData\Local\Programs\Python\Python38-32\lib\site-packages\opcua\common\subscription.py", line 212, in subscribe_events return self._subscribe(sourcenode, ua.AttributeIds.EventNotifier, evfilter, queuesize=queuesize) File "C:\Users\WinCC\AppData\Local\Programs\Python\Python38-32\lib\site-packages\opcua\common\subscription.py", line 230, in _subscribe mids[0].check() File "C:\Users\WinCC\AppData\Local\Programs\Python\Python38-32\lib\site-packages\opcua\ua\uatypes.py", line 218, in check raise UaStatusCodeError(self.value) opcua.ua.uaerrors._auto.BadMonitoredItemFilterInvalid: The monitored item filter parameter is not valid.(BadMonitoredItemFilterInvalid)

Also pls check the attachement of the Server Time Out Configuration File / Python Error Console & the opcua client.py file settings.

Now i am only getting the error : ServiceFault from server received while waiting for publish response

AndreasHeine , pls check the below code files on which file willbe running ok without this errors.

Pls find the below attached files of codes : All 3 clients

client-events_1.txt client-events_2.txt client-events_3.txt

Thanks , AndreasHeine will wait for your reply.

[ts4iot]

Hi rajnishnationfirst,

I'm facing the same problem. Did you get it run?