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Monitored Data Item filter initial value
February 20, 2025
12:07, EET
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opcua_1232141232321
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Hello,

I’m working with OPC UA’s MonitoredItems and have a specific use case where I want to avoid receiving the initial value notification when creating a monitored item. According to the OPC UA specification (Part 4, Section 5.12.2 https://reference.opcfoundation.org/Core/Part4/v104/docs/5.12.2), the server performs initialization processing when a MonitoredItem is added.

Currently, I can work around this by implementing a boolean flag in my data change listener to skip the first notification. However, I’m wondering if there’s any native filtering mechanism in the Java Client SDK to suppress this initial value notification without requiring custom filtering logic.

Is there a more elegant solution available in the SDK?

February 20, 2025
13:02, EET
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Jouni Aro
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The initial values are sent by the server and there is nothing on the client side that you can do to control that. So, your solution is the best option, if you need this.

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