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Note

When creating an Access Control List (ACL) for an MQTT Engine client:

  • There must be RW privilege's for the MQTT Sparkplug™ B STATE message
  • There must be W privilege's for the Sparkplug NCMD message
    • This is used by MQTT Engine to publish the Sparkplug Rebirth request
  • The MQTT Engine SparkplugB Namespace Filter must be configured for the same Group or Group/EdgeNode combination used in the ACL entry


Client Connection Issues

Subscribe on topic not allowed by the ACL

If MQTT Engine or MQTT Transmission client attempts to subscribe on a topic that is not allowed by the ACL for that client, the connection will fail and the client will not attempt to reconnect.

For example with R spBv1.0/My MQTT Group/NDEATH/PLC 1, W # the Transmission client is not able to subscribe to the NCMD and DCMD topics

Publish on a topic not allowed by the ACL

If MQTT Engine or MQTT Transmission client attempts to publish on a topic that is not allowed by the ACL for that client, the connection will be forcefully closed and the client will attempt to reconnect.

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