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Changing an application's registration

When a subscriber has registered, it can use the Register Subscriber command message again to increase the range of topics that it wants to receive information for, or to change the options for topics that it has already registered for.

When a subscription is reregistered, the values you set for the Expiry attribute in the message descriptor (MQMD) of the Register Subscriber command message determines when the subscription expires. This is measured from the time the subscription request is put. Thus the Register Subscriber command message can be used to refresh a subscription before it expires.

 

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