Browsing S7 OPCUA Server, Outputs not returned (FunctionalGroupType?)

[game4automation]

Hi Nauful,

we are trying to browse Nodes in a S7 OPCUA Server. We are browsing with this command: client.Browse(new BrowseDescription[] { new BrowseDescription( topnodeid, BrowseDirection.Forward, NodeId.Zero, true, 0xFFFFFFFFu, BrowseResultMask.All) }, 10000, out browseResults);

In OPCWatch we are seeing several Outputs (Q_Test....) but the browse result by the code above just gives us 2 results, the icon and a Node FunctionalGroupType of NodeClass ObjectType. Do you know how to browse the Outputs?

Thanks a lot Thomas

[nauful]

Hello Thomas,

Could you share a Wireshark capture of browsing without encryption? I would guess it has something to do with references but I need to see to make sure.

Thanks, Nauful

[game4automation]

Hi Nauful,

here is the capture: opcuacapture.zip

[nauful]

Can you capture the browse operation in the other client which shows the correct list of children?

Thanks, Nauful

[game4automation]

It should be somewhere in here: opcuacapture2.zip

[nauful]

Looks like Browse returns a continuation point for you to call BrowseNext:

client.Browse(new BrowseDescription[]
{
        new BrowseDescription(
            new NodeId(2, 0),
            BrowseDirection.Both,
            NodeId.Zero,
            true, 0xFFFFFFFFu, BrowseResultMask.All)
}, 1000, out browseResults);

while (browseResults[0].ContinuationPoint != null)
{
    client.BrowseNext(new[] { browseResults[0].ContinuationPoint }, false, out browseResults);
}

At every step, browseResults will be recreated as a new array.

[game4automation]

Hi Nauful,

thanks a lot for your great support again. This resolved our issue. Something I did not knew.

Best regards Thomas

[nauful]

Great! It's uncommon but if results overflow Browse, servers support continuation points to continue a browse with BrowseNext.

Thanks, Nauful