Add priority to presence about jsxc

[sualko]

@davodego maybe you want to test this.

[zauberstuhl]

@sualko hi, I just finished implementing offline support for our xmpp server (see diaspora/vines#30)
and I discovered that jsxc sends zero presence-priority's on default. In my opinion you should send at least for the 'Online'-presence a positive priority. Otherwise jsxc will receive no offline messages on default.

(source 8.5.2.1.1 xmpp message rules)

[sualko]

Next time, it would be create if you would open a new issue, because it's easier to organize.

On default jsxc sends no priority, not even a zero and on init you can set some default values. So I see no problem.

[zauberstuhl]

Next time, it would be create if you would open a new issue, because it's easier to organize.

next time :)

On default jsxc sends no priority, not even a zero

if you are not sending something a xmpp server will handle it as zero.

on init you can set some default values. So I see no problem.

perfect! was not aware of that I can change priority, too. Thanks.

[sualko]

if you are not sending something a xmpp server will handle it as zero.

You are right. But I don't get the next point:

Otherwise jsxc will receive no offline messages on default.

In the spec theres nothing about a positive priority for offline messages:

For message stanzas, the server MAY choose to store the stanza on behalf of the user and deliver it when the user next becomes available

[zauberstuhl]

checkout the rule section:

If all of the available resources have a negative presence priority then the server SHOULD either (a) store the message offline for later delivery or (b) return a stanza error to the sender, which SHOULD be <service-unavailable/>.

but you are right I made a mistake. The RFC is talking only about non-negative values. Means I should deliver to zero and positive values. Sorry for the confusion :(