On Wed, Jul 24, 2013 at 11:26 AM, Adán Sánchez de Pedro Crespo <adans...@waalt.com> wrote: > Hello everyone,
Hi, > I hope this is the proper mailing list for asking about standards > implementation. If not, please tell me where to reach instead. This is good. > I'm currently developing Loqui, a open source XMPP client app for FirefoxOS > and the web. It formerly supported Chat State Notifications, but determined > support by using the "business rules" in XEP-0085 5.1 > > Nevertheless, the XEP stands that the preferred way to determine support for > CSN is by using 'Service Discovery' or 'Entity Capabilities' extensions. > > So my question is: > When is it ok to perform that disco/caps queries? Should I query everyone in > my roster upon logged in? Absolutely not! Have a look at XEP-0115, which obviates the need for this. > Or should I query just one user once I open a chat > window? How long may I cache the result of the query? XEP-0115 sorts this out for you as well (for contacts in your roster or for which you otherwise have presence). > What's more: though not said in XEP-0085, I think CSN support is clearly > resource-based. Should I query every available resource from a user and then > obey the one with the highest priority value? For the initial message to the bare JID it's probably best not to send CSN anyway. After you've bound the chat to a full JID you know which resource you need to worry about the caps for. /K
