alt Hacker NewsDon't get me wrong, I have been hearing about XMPP forever, and I would love to have an opportunity to try it. Unfortunately it hasn't happened. I have been forced to use Slack, Discord, I have had opportunities to try Matrix, Zulip, of course I have been using IRC for a long time. But XMPP? I may have installed an app, but I haven't had an opportunity to actually use it. Is there a list of communities there?
Then about it being confusing: you're right, that's an outsider point. Because I haven't been able to try it (again nobody ever told me "oh, this project is on XMPP, you can go ask your question with this app/website"), but I have been genuinely interested in it, I ended up on the official pages.
- Check the RFC list: https://xmpp.org/rfcs/#6120. The first one is more than 200 pages, the second more than 100. There are 5 "basic RFCs" and 19 "further RFCs" (whatever "further" is supposed to mean). There is no way I will even open them all. Conclusion: I have no idea how XMPP works, except that there is XML in the mix and a whole bunch of stuff around.
- There is a "technical overview" here: https://xmpp.org/about/technology-overview/. I invite you to have a look at it. Apart from the fact that it seems to use "XMPP" and "Jabber" interchangeably (I think? I'm confused), it kind of loses me at "Jingle", which seems to be a "multimedia specification" (does that mean it's for video?), and has a bunch of implementations, like "pidgin". Isn't pidgin an XMPP client? Here it's under the Jingle section. And then there are extensions, with a whole section just for "Multi User Chats": so the default is that there are no groups, and if my client supports this extension and the server supports it, then I can join a group? I gave up at "PubSub", I did not even read anything from "BOSH".
As a person who wrote his own IRC client, contributed to Signal and looked into the Matrix protocol (which seems more complex than I am comfortable with), I must say that XMPP is in its very own league.
My conclusion with Matrix was that nobody would ever want to write it from scratch, so there has to be some kind of `libmatrix` on top of which people could build. Seems hard in practice because it feels like it keeps changing.
I don't know how fast XMPP is moving, but I would hope that it is now stable. Is there a libxmpp that contains all the necessary features to write a client? Not clear to me. It feels like it's still a complex ecosystem where it depends on the client, and on the server, and on what you want to do.
> XMPP clients mostly work together much better than Matrix clients, from what I've experienced
I can only take your word on it: I don't know a community that is on XMPP, so I haven't had a chance to try. Matrix has been frustrating, that I can say.
XMPP has had less allure as "the new thing" since it's been around for a very long time. It was _the_ chat protocol in the 2000s when it started, and all chat apps used it (when AOL Instant Messenger, Trilian, Purple, Yahoo, ICQ, etc all interoperated). Vendor lock in started taking off not long after though, so Facebook Messenger (also originally XMPP) stopped interoperating and went fully closed along with a number of others, and the ones that interoperated didn't shift business models and disappeared. None of that means there's anything wrong with XMPP, it just means it's not in the public mind.
IRC has been getting the retro nostalgia kick start, and it briefly came back to attention when Slack started as "wrapper" of IRC. In my experience IRC channels are used by about 50% of open source projects, even though it's abysmal for access on mobile devices, very unfriendly for users, and extremely limited in functionality. About 50% of those have a bridge to Matrix so the mobile access is at least somewhat solved, and there are some more usable client options.
It seems because you haven't seen people already adopt it, you believe it must not be good. I'd encourage some basic research for your own benefit so you can see how XMPP is way easier to setup and maintain, far more efficient, and more capable than the oddly more commonly used Matrix/Element. In fact, between the organization issues of the last couple years, everyone finally getting fed up with Matrix being brittle, unmaintainable, and extremely inefficient to run on a server, I would expect Matrix support channels to drop off very rapidly over the next few years.