Persistent XMPP MUC (XEP-45), like WhatsApp groupchats

Question

From the spec —

7.14 Exiting a Room

In order to exit a multi-user chat room, an occupant sends a presence stanza of type \"unavailable\"

Answer 1

Yes you can make your group persistent by setting its configurations this way:

NSString *var = [field attributeStringValueForName:@"var"];
if ([var isEqualToString:@"muc#roomconfig_persistentroom"])
{
    [field removeChildAtIndex:0];
    [field addChild:[NSXMLElement elementWithName:@"value" stringValue:@"1"]];
}