[Standards] Last connection time of friend

Ben Langfeld ben at langfeld.me
Mon Mar 3 17:19:41 UTC 2014


The point here is that this is a normative recommendation against doing
presence probes, because there's often a better way to achieve the result.
It is not denying you the option of doing so.


On 3 March 2014 13:47, Peter Waher <Peter.Waher at clayster.com> wrote:

>  Hello Dave
>
>
>
> Thanks for the quick response. This looks like exactly what I need.
>
>
>
> I'm a little worried about this statement in RFC 6121 though (and the
> explanation a little circular):
>
>
>
>    *Presence probes SHOULD NOT be sent by a client*, because in general a
>
>    client will not need to send them since the task of gathering
>
>    presence from a user's contacts is managed by the user's server.
>
>    However, if a user's client generates an outbound presence probe then
>
>    the user's server SHOULD route the probe (if the contact is at
>
>    another server) or process the probe (if the contact is at the same
>
>    server) and MUST NOT use its receipt of the presence probe from a
>
>    connected client as the sole cause for returning a stanza or stream
>
>    error to the client.
>
>
>
> Sending such probes seems to me to be a great way of finding connection
> problems in Internet of Things networks. Have to do some experiments to
> find out how it works out. Perhaps the explanation for why this should not
> be done by clients can be revised in the RFC?
>
>
>
> Best regards,
>
> Peter Waher
>
>
>
> *From:* Dave Cridland [mailto:dave at cridland.net]
> *Sent:* den 2 mars 2014 16:21
> *To:* XMPP Standards
>
> *Subject:* Re: [Standards] Last connection time of friend
>
>
>
> Some servers also respond to a probe with the last offline presence (with
> a timestamp).
>
>
>
> On 2 March 2014 19:17, Philipp Hancke <fippo at goodadvice.pages.de> wrote:
>
> Am 02.03.2014 20:08, schrieb Peter Waher:
>
>
>
> Is there a means to figure out the last time a friend connected to its
> XMPP server? Can you ask the server hosting the user account for last
> connection time? (You might not have been online to receive the presence
> message when the user went offline.)
>
>
>
> http://xmpp.org/extensions/xep-0012.html#offline -- not sure how many
> servers implement it though.
>
>
>
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