XMPP push notifications causing problems (delay + duplications) in messages -

xmpp push notifications causing problems (delay + duplications) in messages.

i have created chat application using xmpp + ejabberd.

without push notifications:

both single , group chat messages working perfectly.

with push notifications:

sometimes works perfectly.notifications triggered , messages received out delay or duplications.

sometimes no notifications triggered (while app in background) messages received perfectly.

sometimes notifications triggered messages received delay , duplications.

everything on sever side configured correctly.they advised fix issues making sure each session connects 1 persistent resource, making connection stable using whitespace keep alive , when connection lost rebinding same resource.

i have stream management,xmppstream.enablebackgroundingonsocket , app provides voice on ip services background mode enabled.

when user logs out or app terminated teardown stream , send unavailable presence.

below code xmpp stream push notifications , connect/disconnect.

i pulling out hair on this.if guys have idea please let me know.

thanks.

#pragma mark - connect/disconnect  - (bool)connect {  if (!_xmppstream) {     nslog(@"setting stream");     [self setupstream]; }  if (![_xmppstream isdisconnected]) {     return yes; }  nsstring *jabberid = [[nsuserdefaults standarduserdefaults] stringforkey:@"userid"]; nsstring *mypassword = [[nsuserdefaults standarduserdefaults] stringforkey:@"userpassword"];   if (jabberid == nil || mypassword == nil) {     return no; } [_xmppstream setmyjid:[xmppjid jidwithstring:jabberid]]; _password = mypassword;  nserror *error = nil;  if (![_xmppstream connectwithtimeout:xmppstreamtimeoutnone error:&error]){      uialertview *alert = [[uialertview alloc] initwithtitle:@"error" message:[nsstring stringwithformat:@"can't connect server! %@", [error localizeddescription]] delegate:nil cancelbuttontitle:@"ok" otherbuttontitles:nil];     [alert show];     return no; }  return yes;  }  - (void)disconnect {  [self gooffline]; [self teardownstream];  }  - (void)xmppstreamdidauthenticate:(xmppstream *)sender {    [self goonline];  //stream management  nsxmlelement *enable = [nsxmlelement elementwithname:@"enable" xmlns:@"urn:xmpp:sm:3"]; [enable addattributewithname:@"resume" stringvalue:@"true"]; [_xsm.xmppstream sendelement:enable];  //push [self configurepushnotifications]; //  }  -(void)configurepushnotifications{  nsstring *jabberid = [[nsuserdefaults standarduserdefaults] stringforkey:@"userid"];  nsxmlelement *iq = [nsxmlelement elementwithname:@"iq"]; [iq addattributewithname:@"type" stringvalue:@"set"]; [iq addattributewithname:@"id" stringvalue:idstring];  nsxmlelement *push = [nsxmlelement elementwithname:@"push" xmlns:@"p1:push"];  nsxmlelement *keepalive = [nsxmlelement elementwithname:@"keepalive"]; [keepalive addattributewithname:@"max" integervalue:30];  nsxmlelement *session = [nsxmlelement elementwithname:@"session"]; [session addattributewithname:@"duration" integervalue:60];  nsxmlelement *body = [nsxmlelement elementwithname:@"body"]; [body addattributewithname:@"send" stringvalue:@"all"]; [body addattributewithname:@"groupchat" stringvalue:@"true"]; [body addattributewithname:@"from" stringvalue:jabberid];  nsxmlelement *status = [nsxmlelement elementwithname:@"status"]; [status addattributewithname:@"type" stringvalue:[nsstring stringwithformat:@"new message %@",jabberid]];  nsxmlelement *offline = [nsxmlelement elementwithname:@"offline" stringvalue:@"true"];  [push addchild:keepalive]; [push addchild:session]; [push addchild:body]; [push addchild:status]; [push addchild:offline];  nsxmlelement *notification = [nsxmlelement elementwithname:@"notification"]; [notification addchild:[nsxmlelement elementwithname:@"type" stringvalue:@"applepush"]]; [notification addchild:[nsxmlelement elementwithname:@"id" stringvalue:_userdevicetoken]];  [push addchild:notification];  nsxmlelement *appid = [nsxmlelement elementwithname:@"appid" stringvalue:@"appid"];  [push addchild:appid];  [iq addchild:push];  [[self xmppstream] sendelement:iq];    }  - (void)setupstream {  _xmppstream = [[xmppstream alloc] init]; _xmppstream.hostname = khostname; _xmppstream.hostport = khostport; _xmppstream.enablebackgroundingonsocket = yes; [_xmppstream adddelegate:self delegatequeue:dispatch_get_main_queue()];  //xmppreconnect  _xmppreconnect = [[xmppreconnect alloc] init]; [_xmppreconnect activate:_xmppstream];  //stream management  _xsm = [[xmppstreammanagement alloc] init]; [_xsm enablestreammanagementwithresumption:yes maxtimeout:0]; [_xsm activate:_xmppstream];  //last activity  _xmpplastactivity = [[xmpplastactivity alloc] initwithdispatchqueue:dispatch_get_main_queue()]; [_xmpplastactivity adddelegate:self delegatequeue:dispatch_get_main_queue()]; [_xmpplastactivity activate:_xmppstream];   }   - (void)goonline { xmpppresence *presence = [xmpppresence presence]; [[self xmppstream] sendelement:presence];  }   - (void)gooffline { xmpppresence *presence = [xmpppresence presencewithtype:@"unavailable"]; [[self xmppstream] sendelement:presence]; }  - (void)teardownstream {  [_xmppstream disconnect];  [_xmppstream removedelegate:self]; [_xmppreconnect removedelegate:self];  [_xmpplastactivity removedelegate:self];  [_xmppreconnect deactivate];   _xmppstream = nil; _xmppreconnect = nil; _xmpplastactivity = nil;    } 

you need make sure passing resource when connect ejabberd. resource should randomly generated on first app install , on subsequent login, should use same resource. otherwise created new long running detached session on each new login on server , causing messages routed pending sessions. when expires routed again etc.

in xmpp, resource identifier of device basically. need generate jid login string of form "user@domain/resource"