jdev - 2023-05-09

when i subscribe to a pubsub node

not with the +notify stuff, rather in the classical sense

does the pubsub server then send me each update to the node as event message, even if im not online?

go these messages into MAM?

lovetox, yes it does, and... "it depends" :)

When you configure a pubsub node you determine if it will send event notifications or not, and if they should include reference to item, or include the payload in the event message. Event message “should”™ be sent even if recipient is offline, if offline messaging is supported.

ok but its type = normal, will it be stored in MAM?

lovetox, notifications from Prosody (and I think ejabberd?) are type=headline

There is a per-node config option for that in XEP-0060, but at least Prosody doesn't implement it for PEP (maybe we do for standalone pubsub, not sure)

Looks like we do support it for standalone pubsub, but not PEP. That's something we could probably improve.

I thought pep and pubsub was the same thing backed by the same code?

The code that generates PEP notifications does not honour the notification type config option

Oh

There’s also a not-so-much-documented option for pubsubnodes called pubsub#presence_based_delivery, which allows you to configure a node (it seems, or as I interpret it) to only send notifications if IM is online. ✏

Really should have been a subscription option anyway

ok but if its type=headline then its probably not stored by MAM

lovetox, right

how would a client use this subscription then? subscribe while online, and on restart and coming online, poll every node you are subscribed for updates?

Well, PEP is almost exclusively used with +notify instead to prevent the need for that

Explicit subscriptions weren't even supported in Prosody a version or two ago

pep works only if i have presence subscription with a contact or?

Yes

yeah im thinking about ways to do this without having pres sub

Is this related to OMEMO at all?

yes that was the usecase

how do i get updates from the devicelist

which is openly published

i would need to subscribe, and then poll on coming online

if i understood it correctly

pubsub since, except that needs presence subscription too?

There was a discussion about this recently, somewhere. There was one client (maybe Kaidan?) which does explicit subscriptions this way, I think

but its weird, then i need to manage myself to what contacts im subscribed, and ihave no real trigger to unsubscribe

as contacts are not in my roster

i could only go with some defined time without message or something

or don't subscribe at all, poll for devices, keystuffs at intervals while communicating, or if you see a new device on incoming messages?

if that even works

how often do people who aren't developers add new devices anyway?

What if we had temporary (presence) subscriptions with PEP support? Like, exchange mutual directed presence. Server would unsubscribe you automagically when you go unavailable.

yeah its probably easier for the omemo case to simply query when a conversations starts

and yes your way also works

if i see a new device in a message i dont know, i can trigger a query

I think that's what Conversations does

> Really should have been a subscription option anyway Yes ↺

Can i contact crd2life company