RFC3996-Internet Printing Protocol (IPP): The ippget Delivery Method for Event Notifications

5.2.1.  notify-get-interval (integer(0:MAX))

   The value of this operation attribute is the number of seconds that
   the Notification Recipient SHOULD wait before trying the Get-
   Notifications operation again.  The Printer MUST return this
   operation attribute if (1) it is too busy to return events, (2) the
   Notification Recipient client did not request Event Wait Mode, or (3)
   the Printer is terminating Event Wait Mode.  The client MUST accept
   this attribute and SHOULD reissue the Get-Notifications operation
   (with or without "notify-wait" = 'true') at the indicated number of
   seconds in the future in order to get more Event Notifications  This
   value is intended to help the client be a good network citizen.

   The value of this attribute MUST be at least as large as that of the
   Printer's "ippget-event-life" Printer Description attribute (see
   section 8.1).  The Printer MAY return a value that is larger than
   that of the "ippget-event-life" Printer Description attribute
   provided that the Printer increases the Event Life for this
   Subscription object so that Notification Recipients taking account of
   the larger value and polling with a longer interval will not miss
   events.  Note:  Implementing such an algorithm requires some hidden
   attributes in the Subscription object that are IMPLEMENTATION
   DEPENDENT.

   If the Printer wants to remain in Event Wait Mode, then the Printer
   MUST NOT return this attribute in the response.

   Here is a complete table of combinations of "notify-wait", "status-
   code", "notify-get-interval", and Event Notification Attributes
   Groups for Get-Notification initial (Wait and No Wait) Responses and
   subsequent Event Wait Mode Responses (which may stay in Event Wait
   Mode or may request the Notification Recipient to leave Event Wait
   Mode):

       Table 2.  Combinations of "notify-wait", "status-code", and

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