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- XML-DA. Disable advanced polled refresh
XML-DA. Disable advanced polled refresh
Expected release date is 1-3 weeks.
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Good news are that we are finalizing one large (unrelated) functionality area, so there in fact might be 2020.2 release in matter of weeks (this is not a promise, though).
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Nordex OPC XML-DA server
Unfortunately, this functionality can not be easily adjusted on the server side
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Why don't you ask them to fix it?
If an attribute in a request is optional, it means that the send may or may not include it. It also means that the server must be ready to handle both situations, unless the specification allows for different behavior on server side. Everything the the specification describes is mandatory for the server unless specified optional. Otherwsie, the specification would be useless.
We do not do specific implementation work for pay.
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I don't quite agree with you. According to the description of SubscriptionPolledRefresh request, the attribute "HoldTime" is optional. It means that opc client must implement basic polled refresh approach with delaying on the client side.
Anyway, how much can it cost to speedup implementation?
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I am hesitant to do extra work on an obsoleted protocol for free just to fix a problem that should really be fixed on the server side. If we decide to do it - which is not sure - it will have to go to next version, not to the existing one. There is no date scheduled for the next version yet.
And it needs to be thought through. It cannot be in instance parameters because multiple instances (if they have Isolated = false) share the same subscriptions. It would have to be in EasyDAAdaptableParameters.
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It can a patch that allows me to configure opc client instance parameter "PolledRefreshDelay" in msec.
It should delay next SubScriptionPolledRefresh call for active group.
PolledRefreshDelay = 0 - we have a regular behavior (default value)
PolledRefreshDelay = "opc group update rate" - should fix my problem
Can you do it in this way?
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I have a problem. The OPC XML DA server is not supporting sophisticated polling approach and looks like will never do.
What is needed to implement waiting approach on the client side rather than delegate it to the server?
Maybe you know a trick how to delay SubscriptionPolledRefresh call.
I need the solution ASAP
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AFAIK, all OPC XML-DA servers must support it.
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I figure out that opc library is using sophisticated polling approach passing "Holdtime" and "Waittime" parameters in SubscriptionPolledRefresh call.
I hove a trouble with one of OPC XML-DA server that does not perform a delayed poll and sends an answer immediately.
Can I disable this behavior and delegates the waiting to the client side instead?
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- Forum
- Discussions
- QuickOPC-Classic in .NET
- Reading, Writing, Subscriptions, Property Access
- XML-DA. Disable advanced polled refresh