uaCap:Robustness Buffering

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URN:          https://opcfoundation.org/wiki/index.php/Robustness/Buffering

Description
Sent notifications of subscribed data or events will be buffered for retransmission until acknowledged by the Client. This ensures reliable delivery of these messages even during short network interrupts.
See Data Model and Services::Durable Subscription Capability that offers even more advanced buffering.

Usage Considerations

  • No loss of information during network interrupts.

Conformance Testing

Client Server
  • Acknowledge received notification messages.
  • Use republish services for missing notification messages.

Maintain a retransmission queue of sent notification messages with a minimum size defined in OPC UA Part 4.