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MQTT Engine provides a configuration section to the Ignition Gateway.  These can be seen in the Configure section of the Ignition Gateway web UI in the left panel.

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Once in the configuration section there are three tabs: Servers, Advanced, and Namespaces.  Each of these tabs is described in detail in the following sections.

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  • Block Node Commands
    • Whether or not to block outgoing commands from MQTT Engine to Edge Nodes. This is true by default and provides a security mechanism for preventing accidental outgoing commands from MQTT Engine.
  • Block Device Commands
    • Whether or not to block outgoing commands from MQTT Engine to Devices. This is true by default and provides a security mechanism for preventing accidental outgoing commands from MQTT Engine.
  • File Policy
    • The policy for handling Files contained within a Sparkplug payload.
      • Ignore: The default policy. The file will be ignored.
      • Store: The file will be stored to the local file system in the directory specified by the File Location field.  A Tag will be created with a String value representing the file URI.
  • File Location
    • The directory to store the files when using the Store policy described above.
  • Store Historical Events
    • Whether or not to write historical change events directly to the Historian (if history is enabled on a Tag) instead of updating the live Tag value.

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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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Additional or alternative MQTT Servers can be configured in MQTT Engine.  Often times more than one will be configured to handle fail-over in redundant or geographically distributed systems.  The configuration options for servers are listed below.

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