Can we have duplicate name in Payload of a NetworkMessage|OPC UA Standard|Forum|OPC Foundation

Thank you Randy.

The use case which I am trying to address here is, we have Publisher components which fetch data from the UA Server and sent to Mqtt broker.

So, if the publisher is subscribed to a server monitored item, where Queue size is greater than 1 (Say 5).

For every publishing interval, Publishing response may have 5 values for the monitored item.

How to send all the 5 values received from the server, in the Payload to the Broker.

Hi Randy,

Thanks for your Inputs. 

So i created multiple DatasetMessage for a Tag/Item for every Sampling Interval. The Network Message looks as given below:

{“MessageId”:”1287f24d-8229-4580-874f-0eaf142526f9″,”MessageType”:”ua-data”,”PublisherId”:”Publisher”,”DataSetClassId”:”6a4379ac-0adb-4000-8b7e-b57eaca01826″,
“Messages”:{“DataSetWriterId”:1,”SequenceNumber”:15,”MetaDataVersion”:{“MajorVersion”:1,”MinorVersion”:1},”Payload”:{“DataSetId”:{“Value”:{“Type”:12,”Body”:”DataSetId#01″},”SourceTimestamp”:”2021-07-26T01:30:40.1811213Z”,”ServerTimestamp”:”2021-07-26T01:30:40.181122Z”},”NS4|Numeric|1003″:{“Value”:{“Type”:4,”Body”:9},”SourceTimestamp”:”2021-07-26T01:29:56.4537117Z”,”ServerTimestamp”:”2021-07-26T01:29:56.5847112Z”}}},
“Messages”:{“DataSetWriterId”:1,”SequenceNumber”:16,”MetaDataVersion”:{“MajorVersion”:1,”MinorVersion”:1},”Payload”:{“NS4|Numeric|1003”:{“Value”:{“Type”:4,”Body”:10},”SourceTimestamp”:”2021-07-26T01:29:59.0757308Z”,”ServerTimestamp”:”2021-07-26T01:29:59.184747Z”}}},
“Messages”:{“DataSetWriterId”:1,”SequenceNumber”:17,”MetaDataVersion”:{“MajorVersion”:1,”MinorVersion”:1},”Payload”:{“NS4|Numeric|1003”:{“Value”:{“Type”:4,”Body”:11},”SourceTimestamp”:”2021-07-26T01:30:01.3107239Z”,”ServerTimestamp”:”2021-07-26T01:30:01.3847107Z”}}}}

The problem here is, the  JSON validator is failing, with Error “Duplicate key ‘Messages’.

Any inputs on this?

Thank you.