Вот пример готовых методов использования XEP-0333, особенно для статусов доставки и чтения:
Strophe.addNamespace('CHAT_MARKERS', "urn:xmpp:chat-markers:0");
...
sendDeliveredMarker: function(to, from, originalMessageId) {
var stanzaParams = {
type: 'chat',
from: from,
id: "<id>",
to: to
};
var messageStanza = $msg(stanzaParams);
messageStanza
.c('received', {
xmlns: "urn:xmpp:chat-markers:0",
id: originalMessageId
})
.up();
this.xmppClient.send(messageStanza);
},
sendReadMarker: function(to, from, originalMessageId) {
var stanzaParams = {
type: 'chat',
from: from,
id: "<id>",
to: to
};
var messageStanza = $msg(stanzaParams);
messageStanza
.c('displayed', {
xmlns: "urn:xmpp:chat-markers:0",
id: originalMessageId
})
.up();
this.xmppClient.send(messageStanza);
},