[milo-dev] Problem reading variable value

[Joaquim Torres <joaquimtorres@xxxxxxxxxxxxxxxxxxx>]

Hello,

I'm writing a Java client to read variable values from a opcua server 
that is a gateway to several machines. I can read the values from the 
server variables, but not from the machine variables. The machine 
variables values allways return null.

The machine variables have ns=2, the server variables have ns=0.

The NodeId for the variable I'm trying to read is created with the 
following code:

public static final NodeId CycleCounter = new NodeId(Unsigned.ushort(2), 
"47.CycleCounter");

A modified ReadExample program called ReadTest:

    @Override
    public void run(OpcUaClient client, CompletableFuture<OpcUaClient> 
future) throws Exception {
        // synchronous connect
        client.connect().get();

        VariableNode node2 = 
client.getAddressSpace().createVariableNode(HuskyIds.CycleCounter);
        DataValue value2 = node2.readValue().get();
        logger.info("CycleCounter = {}   {}", 
value2.getValue().getValue(), value2.getStatusCode());
        future.complete(client);
    }

prints:

[main] INFO org.eclipse.milo.examples.client.ReadTest - CycleCounter = 
null   StatusCode{name=Good, value=0x00000000, quality=good}

I interpret this log as the server recognizing the variable Id as valid, 
but the return value is still null.

The machine variables have ns=2. Is this the problem? If so, How can I 
read their values?

Thank you.
Joaquim Torres