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If you are new to MQTT topics, the Eclipse Foundation's Paho project provides good information here on the basics of wildcards.

For subscriptions, two wildcard characters are supported:

• A '#' character represents a complete sub-tree of the hierarchy and thus must be the last character in a subscription topic string, such as SENSOR/#. This will match any topic starting with SENSOR/, such as SENSOR/1/TEMP and SENSOR/2/HUMIDITY.
• A '+' character represents a single level of the hierarchy and is used between delimiters. For example, SENSOR/+/TEMP will match SENSOR/1/TEMP and SENSOR/2/TEMP.

Definition

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

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