How to implement a AttributeHistoryServiceSet in OPC UA Server

[zhanglc]

Hi ,

I want to use milo to implement an opc ua server , in which I can mock some history data.

Looked at the milo code and it seems that I need to implement an AttributeHistoryServiceSet , and then set in the OpcUaServer, when the client call, the subclass of AttributeHistoryServiceSet will return data , which is mocked.

How do I do it? Is there some tutorial here?

Any tips would be greatly appreciated.

[kevinherron]

In your Namespace or AddressSpace implementation you would just implement/override the default implementations of AttributeHistoryServices::historyRead and AttributeHistoryServices::historyUpdate

milo/opc-ua-sdk/sdk-server/src/main/java/org/eclipse/milo/opcua/sdk/server/api/services/AttributeHistoryServices.java

Lines 32 to 73 in 3419235

	/**
	* Read history values from nodes belonging to this {@link AttributeHistoryServices}.
	* <p>
	* Complete the operation with {@link HistoryReadContext#success(Object)}.
	*
	* @param context the {@link HistoryReadContext}.
	* @param timestamps requested timestamp values.
	* @param readValueIds the values to read.
	*/
	default void historyRead(HistoryReadContext context,
	HistoryReadDetails readDetails,
	TimestampsToReturn timestamps,
	List<HistoryReadValueId> readValueIds) {
	HistoryReadResult result = new HistoryReadResult(
	new StatusCode(StatusCodes.Bad_HistoryOperationUnsupported),
	null,
	null
	);
	context.success(Collections.nCopies(readValueIds.size(), result));
	}
	/**
	* Update history values in nodes belonging to this {@link AttributeHistoryServices}.
	* <p>
	* Complete the operation with {@link HistoryUpdateContext#success(Object)}.
	*
	* @param context the {@link HistoryUpdateContext}.
	* @param updateDetails the values to read.
	*/
	default void historyUpdate(HistoryUpdateContext context,
	List<HistoryUpdateDetails> updateDetails) {
	HistoryUpdateResult result = new HistoryUpdateResult(
	new StatusCode(StatusCodes.Bad_HistoryOperationUnsupported),
	null,
	null
	);
	context.success(Collections.nCopies(updateDetails.size(), result));
	}

)

You should not need to replace the service sets.