Publishers do not have to register with a broker. This saves the programming overhead of performing the registration, and of deregistering when the publisher has finished. However, other applications cannot find out about unregistered publishers because they do not appear in metatopics (see Metatopics for information about these). Unregistered publishers can send Publish command messages to the broker, specifying that they do not want the broker to perform an implicit registration, provided that both of the following statements are true:
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