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• Enable Tag Latching

  • Whether or not to enable Tag latching to synchronize MQTT Tag updates with events in Ignition.

• Latch Timeout

  • The amount of time to wait for a Tag latch to be released before timing out.

• Latch Tags

  • A list of Trigger Tag and Latch Tag pairs.

• Enable Primary Host Subscriptions

  • Whether or not to enable MQTT Engine subscriptions on STATE/# and State/# topics even when a PrimaryHostID is not configured within MQTT Engine. This setting is for debugging purposes only.

• Enable BD Sequence Validation

  • Whether or not to enable BIRTH/DEATH sequence number validation (required by Sparkplug specification).
• Custom Properties
  • Custom configuration properties that are fed into MQTT Engine. Custom properties should only be used at the direction of CIrrus Link and the specific properties will be provided.

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Servers

The second tab is a list of MQTT Servers that MQTT Engine should connect to.  By default, MQTT Engine is configured to connect to the local MQTT Distributor based MQTT Server.  It is set up to connect to localhost, port 1883, using the default username/password pair of admin/changeme.  Out of the box MQTT Engine will work with MQTT Distributor and its default configuration.  The connection status of each server can be seen in the 'Status' column.  Clicking on the 'Create new MQTT Server' link will bring up the following form for adding a new MQTT Server setting.

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Clicking on the 'Create new MQTT Server...' link will bring up the following form to add a new Server.

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Namespaces

The third tab is used for configuring namespaces.  Each namespace configuration represents a family of devices and/or data that MQTT Engine will support.  A namespace defines the topics that each MQTT Engine client will subscribe on as well as indicates how the payload will be handled.  There are two types of namespaces: Default and Custom.  

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Clicking on the 'Create new Custom Namespace...' link will bring up the following form to add a new Custom Namespace.

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Custom Namespace Example  

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