Question

I am trying to build a simple Jabber client.
I have downloaded this sample project, which uses xmpp-framework https://github.com/funkyboy/Building-a-Jabber-client-for-iOS
I am running it in the iOS Simulator. I have installed Openfire locally so that I can interact with a user logged into iChat.

Unfortunately the app only receives messages. It fails in sending messages giving the error “TURN Connection failed!”.

This is the code attempting to connect:

- (void)viewDidLoad 
{
    [super viewDidLoad];
    self.tView.delegate = self;
    self.tView.dataSource = self;
    [self.tView setSeparatorStyle:UITableViewCellSeparatorStyleNone];

    messages = [[NSMutableArray alloc ] init];

    JabberClientAppDelegate *del = [self appDelegate];
    del._messageDelegate = self;

    [self.messageField becomeFirstResponder];

    XMPPJID *jid = [XMPPJID jidWithString:@"[e-mail]"];

    NSLog(@"Attempting TURN connection to %@", jid);

    TURNSocket *turnSocket = [[TURNSocket alloc] initWithStream:[self xmppStream] toJID:jid];

    [turnSockets addObject:turnSocket];

    [turnSocket startWithDelegate:self delegateQueue:dispatch_get_main_queue()];
    [turnSocket release];   
}

And those are the methods called on success/failure:

- (void)turnSocket:(TURNSocket *)sender didSucceed:(GCDAsyncSocket *)socket 
{   
    NSLog(@"TURN Connection succeeded!");
    NSLog(@"You now have a socket that you can use to send/receive data to/from the other person.");

    [turnSockets removeObject:sender];
}

- (void)turnSocketDidFail:(TURNSocket *)sender 
{   
    NSLog(@"TURN Connection failed!");
    [turnSockets removeObject:sender];
}

Can anyone please help?
Thank you.

Answer 1

There is no reason to use TURN for normal messaging. TURN is required for media streaming only. Just use XMPPFramework. There are some good getting-started guides.

Next, use code of this nature to create and send stanzas:

XMPPMessage *msg = [XMPPMessage message];
[msg addAttributeWithName:@"type" stringValue:@"chat"];
[msg addAttributeWithName:@"to" stringValue:@"[e-mail]"];
NSXMLElement *body = [NSXMLElement elementWithName:@"body" stringValue:@"Hello"];
[msg addChild:body];
[[self xmppStream] sendElement:msg];

Note that msg is just a subclass of NSXMLElement, so you can modify the XML at will to craft the protocol you’re going to send.