Intermittent issues occur during automatic reconnection when testing OPC server disconnection

[lrs-960]

Describe the bug
After losing connection with OPC server, recreated new monitoredItems via SubscriptionListener.onSubscriptionTransferFailed callback, but reconnection throws UaServiceFaultException: status=Bad_NoSubscription, description=There is no subscription available for this session
This issue does not reproduce consistently — it occurs intermittently during reconnection testing.
Once it occurs, subscription data will no longer be received thereafter. Logs show: ServerState: Running Active
KeepAlive

Additional context
version 0.6.12

[kevinherron]

When SubscriptionListener.onSubscriptionTransferFailed is called you also have to create a new Subscription first.

If you can provide some logs or Wireshark capture or something when it occurs I might be able to offer advice, but 0.6.x is not supported, so if there's actually a bug here it would need to exist in 1.x to get triaged and fixed.

[lrs-960]

Okay, thank you. I'll try upgrading to 1.1.2. Is the upgrade seamless? What should I be aware of when upgrading?

[lrs-960]

Hello, I have another question. After defining a node tree on the server side, when the node tree changes, I need to delete my entire custom node tree and then redefine it. However, the getNodeManager().removeNode() method doesn't remove the node tree from the list. Am I doing something wrong? Are there any examples of changing nodes? See the pseudocode below:

private void clearNodes() {
getNodeManager().removeNode(rootNode.getNodeId());
ioChannelNodeMap.forEach((k, v) -> getNodeManager().removeNode(v.getNodeId()));
ioDeviceNodeMap.forEach((k, v) -> getNodeManager().removeNode(v.getNodeId()));
ioPointNodeMap.forEach((k, v) -> getNodeManager().removeNode(v.getNodeId()));
ioChannelNodeMap.clear();
ioDeviceNodeMap.clear();
ioPointNodeMap.clear();
}

[kevinherron]

Something like rootNode.delete() should be enough if the Node is the single root of everything else you've added.

delete() removes the node from the UaNodeManager and also cleans up all the references.

milo/opc-ua-sdk/sdk-server/src/main/java/org/eclipse/milo/opcua/sdk/server/nodes/UaNode.java

Lines 256 to 276 in bd15067

	/**
	* Delete this Node, its References, and all its child Nodes and their References, recursively.
	*/
	public final void delete() {
	NodeManager<UaNode> nodeManager = context.getNodeManager();
	nodeManager.removeNode(getNodeId());
	for (Reference reference : nodeManager.getReferences(getNodeId())) {
	if (reference.isForward() && reference.subtypeOf(Identifiers.HasChild)) {
	Optional<UaNode> targetNode = nodeManager.getNode(
	reference.getTargetNodeId(),
	getNodeContext().getServer().getNamespaceTable()
	);
	targetNode.ifPresent(UaNode::delete);
	}
	nodeManager.removeReferences(reference, context.getNamespaceTable());
	}
	}