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ACLs are defined by the following format: [R|W|RW] topic
where:
R = Read or 'subscribe' privileges
W = Write or 'publish' privileges
RW = Read and Write (subscribe and publish) privileges
topic = The topic or wildcard topic representing the scope of the privilege
Below are some example ACL definitions
ACLs should be designed with a 'principal of least privilege' model while also considering device management and maintenance. For example gateways and devices in the field should be limited to publishing and subscribing only on the topics for which they should be expected to. The same should be true of 'consumer' applications that will be either sending commands to devices in the field or consuming data coming from those devices.
It is also important to note that a username is not limited to a single MQTT client. A username/password pair could be used for multiple MQTT clients.
If you are new to MQTT topics, Eclipse provides good information here on the basics and wildcards.
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