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To determine the string replacement needed for the namespace:

• each incoming topic:

Consider an incoming MQTT message with the characteristics:

• Topic = a/b
• Payload = { "tag 1": 123, "tag@2": "some.value" }

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• Look at the published MQTT topic and a sample payload, if parsing as JSON, and identify any characters that may be problematic.
• Review these characters against the rules above or open Ignition designer and test if a tag can be created with the specific characters.
• If a tag cannot be created, created a string replacement rule.

Consider Now consider an incoming MQTT message with the characteristics:

• Topic = a/b
• Payload = { "tag 1": 123, "tag@2": "some.value" }

This A custom namespace with a subscription a/# will be able to receive the message however this will fail to be handled by the Custom Namespace and an error will be logged that looks like:

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