objective c - Connecting to a server with NSNetService but failing- automatic socket disconnect? -

new simpler version of problem:

i'm trying connect , communicate bonjour device using objective-c client , i'm having trouble resolving service (server). tried more complicated example, found basic socket connection port/ip specified wasn't working.

i have barebones possible code using cocoaasyncsocket library:

asyncsocket *xxx = [[[asyncsocket alloc] initwithdelegate:self] autorelease]; nserror **err; [xxx connecttohost: @"localhost" onport: 5000 error: err]; nslog(@"err=%@",err); 

and here's server i'm trying connect (python script):

# tcp server bonjour broadcast!     import select import sys import pybonjour import socket time import sleep  #name    = sys.argv[1] #regtype = sys.argv[2] #port    = int(sys.argv[3])  # bonjour service parameters name = "test" regtype = "_xxx._tcp." port = 5000 # tcp socket stuff server_socket = socket.socket(socket.af_inet, socket.sock_stream) server_socket.bind(("", port)) server_socket.listen(5)   def register_callback(sdref, flags, errorcode, name, regtype, domain):     if errorcode == pybonjour.kdnsserviceerr_noerror:         print 'registered service:'         print '  name    =', name         print '  regtype =', regtype         print '  domain  =', domain  sdref = pybonjour.dnsserviceregister(name = name,                                      regtype = regtype,                                      port = port,                                      callback = register_callback)   # register bonjour service print "registering bonjour service" ready = select.select([sdref], [], []) print "ready=",ready if sdref in ready[0]:     pybonjour.dnsserviceprocessresult(sdref)  def configloop():     data = "entering configuration mode"     client_socket.send (data)     data = "1) network ssid: "     client_socket.send (data)     ssid = client_socket.recv(512)     print "network ssid:",ssid     data = "2) login: "     client_socket.send (data)     login = client_socket.recv(512)     print "login:",login     data = "3) password: "     client_socket.send (data)     passw = client_socket.recv(512)     print "password:",passw     data = "restarting server , attempting connect "+ssid     client_socket.send (data)     sleep(1)     sys.exit(0)    print "tcpserver waiting client on port",port try:     while 1:          client_socket, address = server_socket.accept()         print "i got connection ", address          data = "connection!"         client_socket.send (data)          while 1:             data = client_socket.recv(512)             if ( data == 'q' or data == 'q'):                 client_socket.close()                 break;             elif (data == 'c' or data == 'config'): # enter configuration mode                 configloop();             else:                 print "recieved:" , data  finally:     sdref.close() 

the server never sees incoming connection. on client side, error var has value or something- nothing i'd expect. please?

old (more complicated version, uses same server):

my debug output says service resolved... , socket disconnect after. meanwhile server sits there , hasn't seen incoming connections.

i've walked through debugger when initial connection , print out name of service- , hangs until press continue , socket disconnect after???

i'm new objective-c , event driven programming, perhaps i'm handling wrong? appreciate advice!

client (debugger) output:

running… 2011-05-10 14:10:26.822 client[34709:a0f] test 2011-05-10 14:10:26.850 client[34709:a0f] socket disconnected 2011-05-10 14:10:29.724 client[34709:a0f] not resolve: {     nsnetserviceserrorcode = -72003;     nsnetserviceserrordomain = 10; }  

server output:

registering bonjour service ready= ([<dnsserviceref object @ 0x100583290>], [], []) registered service:   name    = test   regtype = _xxx._tcp.   domain  = local. tcpserver waiting client on port 5000 

the client code (clientcontroller.m, lifted http://www.macresearch.org/cocoa-scientists-part-xxix-message):

#import "clientcontroller.h" #import "asyncsocket.h"   @interface clientcontroller ()  @property (readwrite, retain) nsnetservicebrowser *browser; @property (readwrite, retain) nsmutablearray *services; @property (readwrite, assign) bool isconnected; @property (readwrite, retain) nsnetservice *connectedservice; @property (readwrite, retain) mtmessagebroker *messagebroker;  @end   @implementation clientcontroller  @synthesize browser; @synthesize services; @synthesize isconnected; @synthesize connectedservice; @synthesize socket; @synthesize messagebroker;  -(void)awakefromnib {     services = [nsmutablearray new];     self.browser = [[nsnetservicebrowser new] autorelease];     self.browser.delegate = self;     self.isconnected = no; }  -(void)dealloc {     self.connectedservice = nil;     self.browser = nil;     self.socket = nil;     self.messagebroker = nil;     [services release];     [super dealloc]; }  -(ibaction)search:(id)sender {     [self.browser searchforservicesoftype:@"_xxx._tcp." indomain:@""]; }  -(ibaction)connect:(id)sender {     nsnetservice *remoteservice = servicescontroller.selectedobjects.lastobject;     remoteservice.delegate = self;     [remoteservice resolvewithtimeout:30];     nslog(@"%@",remoteservice.name); }  -(ibaction)send:(id)sender {     nsdata *data = [textview.string datausingencoding:nsutf8stringencoding];     nslog(textview.string);     // use socket send raw text data once connected }  #pragma mark asyncsocket delegate methods -(void)onsocketdiddisconnect:(asyncsocket *)sock {     nslog(@"socket disconnected"); }  -(bool)onsocketwillconnect:(asyncsocket *)sock {     if ( messagebroker == nil ) {         [sock retain];         return yes;     }     return no; }  -(void)onsocket:(asyncsocket *)sock didconnecttohost:(nsstring *)host port:(uint16)port {           //mtmessagebroker *newbroker = [[[mtmessagebroker alloc] initwithasyncsocket:socket] autorelease];     //[sock release];     //newbroker.delegate = self;     //self.messagebroker = newbroker;     self.isconnected = yes; }  #pragma mark net service browser delegate methods -(void)netservicebrowser:(nsnetservicebrowser *)abrowser didfindservice:(nsnetservice *)aservice morecoming:(bool)more {     [servicescontroller addobject:aservice]; }  -(void)netservicebrowser:(nsnetservicebrowser *)abrowser didremoveservice:(nsnetservice *)aservice morecoming:(bool)more {     [servicescontroller removeobject:aservice];     if ( aservice == self.connectedservice ) self.isconnected = no; }  -(void)netservicedidresolveaddress:(nsnetservice *)service {     nserror *error;     self.connectedservice = service;     self.socket = [[[asyncsocket alloc] initwithdelegate:self] autorelease];     [self.socket connecttoaddress:service.addresses.lastobject error:&error]; }  -(void)netservice:(nsnetservice *)service didnotresolve:(nsdictionary *)errordict {     nslog(@"could not resolve: %@", errordict); }  @end 

i having same issue. seems problem connection in place : "attempting connect while connected or accepting connections. disconnect first". unfortunately haven't been able resolve yet. idea ? might delay or ordering process problem.

edit : actually, changing connecttoaddress connecttohost made me ! :)