jdev - 2026-01-28

What OMEMO version is recommended for implementation?

depends. What is your goal?

implementing OMEMO into a client

But is your goal compatibility with the largest number of other clients? Or some other goal

yes, compatibility with other clients

Version 0.3

of the XEP?

> What OMEMO version is recommended for implementation? Both 0.3 and 0.9

Got it, thanks

0.3 to talk to everything out there now, 0.9 to futureproof

relatedly; for clients doing this now, what's the best heuristic for deciding which to use

hello . ✏

Hello everyone. I’m new to this protocol and I’m using it together with Stanza.io and ejabberd. Could you guide me on a solution to mark messages as read? I’ve already tried XEP-0333, but it didn’t work very well

devo, you might want to have a look at XEP-0490, it’s much newer and not supported everywhere yet, but for self-read markers it does what you want.

> relatedly; for clients doing this now, what's the best heuristic for deciding which to use Use lowest common denominator?

If all parties support 0.9, then use 0.9, otherwise use 0.3

how could you possibly tell that

you don't know what clients I'm using now, let alone future ones I might use

Thank you very much. I'll take a look

what is the question? how to decide what to implement or what to use when you add a new contact?

omemo is session based per device, encryption is per device, so you can use omemo1 with one device, omemo2 with another device in the same message

and what to use you see in pubsub, every device announces what it supports