-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Someone just poked me offlist about reliable messaging in XMPP. I replied as follows. Perhaps it makes sense to write this up a bit more formally?
*** Here's how the pieces fit together: 1. If I send a message to you but you have no online clients, your server stores the message for delivery when you're online again: http://xmpp.org/extensions/xep-0160.html 2. What if your client went offline but your server hasn't figured that out yet? Your server can use whitespace pings over the XML stream to figure out if you're online or offline: http://tools.ietf.org/html/draft-ietf-xmpp-3920bis-00#section-5.7.3 3. What if whitespace pings are not reliable enough to determine if your client is online or offline? Your server can use the new stream management extension (this spec is in Last Call right now and is not yet implemented or deployed, but several server codebases are building in support even as we speak): http://xmpp.org/extensions/xep-0198.html 4. What about server-to-server connections? Here again we can use whitespace pings and stream management. 5. What about pinging end-to-end? My client can send an XMPP ping to your client: http://xmpp.org/extensions/xep-0199.html 6. What if I want to know if a specific message was delivered to your client? My client can use message receipts (also not widely implemented or deployed, but easy to add to existing clients): http://xmpp.org/extensions/xep-0184.html Hope that helps. ****** Peter - -- Peter Saint-Andre https://stpeter.im/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAko4BMcACgkQNL8k5A2w/vw5zgCfYqypK3Wv/S2BMjO9aLIk0bz8 RJQAoK5goaQLBWD4UsKIv6aZcQKI5clJ =aHff -----END PGP SIGNATURE-----
