Re: [milo-dev] Structured Data

[Kevin Herron <kevinherron@xxxxxxxxx>]

Hi,

Do not confuse the DataType id (ns=4;i=337), with its encoding ID, which is different. This is likely the server indicating its encoded in the OPC UA binary encoding.

Unfortunately the root of your problem is that the S7-1200, when using the "Service Interface" to define an address space and types, does not support the "legacy" DataType Dictionary mechanism. Only the DataTypeDefinition attribute introduced in OPC UA 1.04. So unfortunately with the Milo 0.6.x release series there is no way to decode these custom types.

Support for this new attribute and decoding custom types has already been implemented in the `dev/1.0` branch but unfortunately I can't say the API in the 1.0 branch is stable enough to use yet.

https://github.com/eclipse/milo/blob/071e4b5a91b17c0c41d600c7ddf3b084f4ee932e/milo-examples/client-examples/src/main/java/org/eclipse/milo/examples/client/UnifiedAutomationReadCustomDataTypeExample2.java#L58

On Mon, Feb 5, 2024 at 6:17 AM Florian Bachmair via milo-dev <milo-dev@xxxxxxxxxxx> wrote:

Hi!

I have structured data with NodeId{ns=4; i=339}

After reading the subscription and decoding I get following Exception:

 no codec registered for encodingId=NodeId{ns=4, id=338}

altough in my Opinion the NodeId of the Datatype should be  NodeId{ns=4, id=337}.


Any Idea what the Problem could be? on a S7-1500 it works just fine, but on an S7-1200 I have the mentioned Problem

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