[Bug 23963] New: Support for presence optimisations

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=23963

           Summary: Support for presence optimisations
           Product: Telepathy
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: low
         Component: telepathy-spec
        AssignedTo: telepathy-bugs at lists.freedesktop.org
        ReportedBy: mikhail.zabaluev at nokia.com


For the power-saving needs of mobile platforms, and to optimise network usage
in general, some IM protocols may offer control over delivery of presence
updates for contacts in the subscription list. Consider adding two possible
optimizations to SimplePresence or a dedicated extension interface:
1. Possibility to disable remote presence updates completely (e.g. when the
screen is locked).
2. Explicit control over the list of contacts for which presence updates are to
be received.

On support in well-known protocols:
* As a general case, no optimizations are offered. This means the feature
should be negotiable and optional to implement.
* In XMPP, we know no XEPs to control presence updates, though such an
extension is not inconceivable.
* As one existing, but not really compelling use case, a non-XCAP presence
implementation in SIP could subscribe to select SIP URIs. Some degrees of
fine-grained control should be possible with XCAP as well, but I can't confirm
this before reading up the voluminous specifications, and server-side support
may be spotty.


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