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MQTT Distributor 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-hand navigation panel - Configure → MQTT Distributor → Settings. 

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Once in the Settings section there are two tabs.  Each has a number of configuration options as described below.

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• Allow Anonymous MQTT Connections

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Users

These are the username/password pairs that are allowed to connect to the MQTT Server and also contains the Access Control Lists (ACLs) for each user.  MQTT Distributor requires that every client connecting to the MQTT Server must provide a valid username and password that is provisioned here.  Any client attempting an anonymous connection will be rejected.  ACLs control what topics a given username/password pair is allowed to publish and subscribe on.  These are described later in this page.

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Image AddedEach user has the following configuration:

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• Username
  • The username that must be provided in the MQTT Connect packet
• Password
  • The password that must be provided in the MQTT Connect packet
• ACLs
  • The comma separated list of ACLs that clients connecting with this username and password are allowed to publish and subscribe on

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Image AddedACL Format

ACLs are defined by the following format: [R|W|RW] topic

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