Subscription issues in python client

General Discussion
1

Hello all,

I’ve just run into a peculiar problem subscribing to nodes from an external python client :

PublishService	Returning ServiceFault for request: [PublishRequest requestHandle=9]. StatusCode=StatusCode[Severity=Bad, Subcode=Bad_InternalError]
 	
java.lang.IllegalArgumentException: fromIndex(0) > toIndex(-1)
at java.util.ArrayList.subListRangeCheck(ArrayList.java:1006)
at java.util.ArrayList.subList(ArrayList.java:996)
at com.inductiveautomation.xopc.server.subscriptions.NotificationMessageFactory.createMessageForItems(NotificationMessageFactory.java:118)
at com.inductiveautomation.xopc.server.subscriptions.BaseSubscription.returnNotifications(BaseSubscription.java:583)
at com.inductiveautomation.xopc.server.subscriptions.BaseSubscription.requestReceivedNormal(BaseSubscription.java:453)
at com.inductiveautomation.xopc.server.subscriptions.BaseSubscription.consume(BaseSubscription.java:409)
at com.inductiveautomation.xopc.server.sessions.UaSession.publishRequestReceived(UaSession.java:313)
at com.inductiveautomation.xopc.server.core.services.subscription.PublishService.executeInternal(PublishService.java:38)
at com.inductiveautomation.xopc.server.core.services.subscription.PublishService.executeInternal(PublishService.java:18)
at com.inductiveautomation.xopc.server.core.services.AbstractService.execute(AbstractService.java:51)
at com.inductiveautomation.xopc.server.stack.AbstractUAServer$RequestServer.serveRequest(AbstractUAServer.java:77)
at com.inductiveautomation.xopc.server.stack.AbstractUAServer$RequestServer.run(AbstractUAServer.java:66)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Has anyone ever run into this? I’ve tested the client with other OPC servers, with no problems.

Thanks for your help.

2

Do you know what MaxNotificationsPerPublish parameter your client is creating the subscription with?

3

The default MaxNotificationsPerPublish is 4294967295

4

Here are all the parameters:

RequestedPublishingInterval = period
RequestedLifetimeCount = 3000
RequestedMaxKeepAliveCount = 10000
MaxNotificationsPerPublish = 4294967295
PublishingEnabled = True
Priority = 0

5

Looks like a bug in the server dealing with a value over a certain size. As a workaround you could probably change that value to 0, which let’s the server choose, or use a value <= 2147483647.

6

Ok, I’ll give it a go.

Thanks for looking into this.

7

Brilliant, that did the trick.