On 18.03.2017 09:43, Dave Cridland wrote: > On 17 Mar 2017 21:52, "Ruslan N. Marchenko" <m...@ruff.mobi > <mailto:m...@ruff.mobi>> wrote: > On 11.02.2017 21:43, Florian Schmaus wrote: > It should be explicitly stated that the CSI state is *not* > (because it > can not) restored after a stream resumption. I've created a PR to > address this: https://github.com/xsf/xeps/pull/402 > <https://github.com/xsf/xeps/pull/402> > > Why *not* btw? Device may detect the connection is dropped (by > server) while still being inactive. The fact it waked from deep > sleep does not indicate it's active. > I convinced it should be quite opposite. The only reason to not > being restored is because (at the moment) it is nonza and nonzas are > not smacked. > > If handheld emits csi/csa events based on user interaction and not > power-management events it may be a bit complicated *not*-restoring > state and then pushing it back to inactive. > The sole fact of resumption means all undelivered (eg. queued) > stanzas are to be delivered - as on any other message delivery. Then > it may continue sleeping as it was before. > Unless it's really active now. > > Perhaps it should be kind of conditional statement - unless CSI is > acked - the state *must not* be assumed to be either restored or > reset - hence it's responsibility of the client to set it back to > the desired state. > > > You can't rely on the state being acknowledged, because that would > require both sides to know that the client has seen the ack.
Does the server really need to know if the client received the ack? Right now I think along the lines of: - the server simply always restores the CSI state - the client keeps track if the last CSI state change was acknowledged - if it was not acknowledged, the client resets the CSI state to its desired state What am I missing here? > Luckily all this doesn't matter. We can set the CSI state during > resumption without additional round trips using SASL2 and IBR2 extensions. I see how XEP-0388/SASL2 could achieve this, but how does XEP-0389/IBR2 fit into this? - Florian
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