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Chunked Messages
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Steffan Sørenes
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03/26/2020 - 01:42
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Hi,

In OPC UA Pub/Sub (Part 14) the UADP mapping defines requirements around chunked messages if a DataSetMessages are distributed/chunked over more than one NetworkMessage. Have you discussed a similar requirement around the JSON encoding since common cloud message brokers have message size limitations. Or should this be implementation-specific details for the JSON mapping? The only statement I find on this in the JSON encoding is "If the JSON encoded NetworkMessage size exceeds the Broker limits the message is dropped and a PubSubTransportLimitsExceeded Event is reported"

Will you also publish a "PubSub AMQP JSON" profile at https://apps.opcfoundation.org.....Reporting/?

Br,

Steffan Sørenes

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Randy Armstrong
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03/26/2020 - 17:45
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The JSON encoding is intended primarily for sending data to destinations that do not understand UA and would therefore not be able to receive an arbitrarily chunked message.

When creating a DataSet for publishing in JSON you need to ensure the broker limits are not exceeded by choosing fields carefully.

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