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fix(plc4j/opcua): Fix null pointer exception in OPC UA Subscription Handle #2025

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@splatch splatch commented Feb 26, 2025

Closes #2024

…andle.

The 'sampling' mode in case of OPC-UA means that no actual events are generated to the client.
This is a sort of 'suspended' subscription which will deliver its events once monitoring item is switched back to reporting mode.
In essence all UA subscriptions must be in reporting mode to generate data for client.

Closes #2024.

Signed-off-by: Łukasz Dywicki <luke@code-house.org>
@splatch splatch self-assigned this Feb 26, 2025
@ottlukas ottlukas added the OPC-UA https://plc4x.apache.org/users/protocols/opcua.html label Feb 27, 2025
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[Bug]: Usage of OPC-UA cyclic subscription causes driver to fail with errors
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