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9:02, EEST
October 17, 2013
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Hi, im looking into creating an application useing OPC-UA and OSGi. But OSGi focuses on dynamically modifying the application after the users needs. So I would like to look into how I can have an application running and later on deploy some hardware and a corresponding data-model from OPC-UA into the currently running server?
Are there any support for dynanamism in OPC-UA or do I have to stop and start the server if I want to deploy another data-model. Either another or an update to the older one.
13:22, EEST
December 21, 2011
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Sorry for the late response. Yes, OPC UA enables modifying the address space dynamically. You can do that easily in the server with the methods of the NodeManagerUaName, for example. And you can also enable the changes from clients, if that is necessary (in your case I assume it’s not important).
You can also use the NodeVersion property in Objects, which enables also ModelChange events, which can be used to notify clients about the changes.
14:41, EET
October 17, 2013
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Ok so after the server has been initialized I can create my initial models and events right?
Then I decide to start the server, and one can after the server is running add more components to the UA server?
This can be done through NodeManagerUaNode.addNodeAndReference for example?
And this will be displayed on the client side without any sort of refresh or reconnect?
17:29, EET
December 21, 2011
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Yes, you can add nodes. The client must of course rebrowse the nodes that get new references. But it can also listen to ModelChangeEvents (GeneralModelChangeEventType) on the Server object, which will tell it which nodes are changed in the server.
13:17, EET
October 17, 2013
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Yeah iv gotten it to work now. So deleting and adding was not a big problem. Do you have any experience with someone using OPC-UA and OSGi?
Also if I want things to update on client side then the client must listen to these events and implement and update\redraw event itself right? Just as you basically said?
14:29, EET
December 21, 2011
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Fine. Yes, I have heard of other customers using it with OSGi without a problem.
Exactly. The clients can notice the changes, if you prepare the server properly. See the SampleConsoleServer.addNode() for a complete example.
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