[Standards] presence TTL

Peter Saint-Andre stpeter at stpeter.im
Tue Jul 16 18:25:11 UTC 2013

On 7/15/13 11:31 PM, Justin Karneges wrote:
> Hey folks,
> For awhile I've been designing systems whereby any entity announcing
> presence has the responsibility of continuously refreshing this
> presence. I've even done this within XMPP by including a <ttl> element
> in the presence stanza indicating a timeout value. If the receiving
> entity does not receive a new presence stanza within this time period
> then it considers the sending entity to be unavailable. I prefer this to
> the practice of the receiving entity having to periodically probe
> whoever it has received presence from. The end result is pretty much the
> same, but to me it feels cleaner to put this responsibility on the sender.
> I wonder if it couldn't hurt to standardize a simple thing like this?
> <presence from="alice" to="bob">
>   <status>I'm here</status>
>   <ttl xmlns="urn:xmpp:tmp:ttl">600</ttl>
> </presence>
> Given the above directed presence, Bob would expect another presence
> stanza from Alice within 10 minutes.

Seems useful.

Would it apply only to presence?


Peter Saint-Andre

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