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From release 4.0.14, MQTT Engine will match ALL namespaces for any incoming message. For example, two custom namespaces can be created where both subscribe on the same topic but one can be configured to parse the payload as JSON and one to parse the payload as string based.

If MQTT Engine is receiving only custom namespace messages, we recommend disabling the Sparkplug B default namespace.

If MQTT Engine is receiving messages from both the Sparkplug B default namespace and a custom namespace, you will need to ensure that your custom namespace subscription is refined so as not to pick up the messages from the Sparkplug B namespace (spBv1.0/......)