iphone socket stream buffer different on simulator and iPhone 6 plus?

I have this sample code taken from the example of this iPhone chat server.

In my case I need to send larger amounts of data, 100k-200k thus I changed the buffer size to something that can accommodate what I want.

On the iOS simulator (emulating a 6plus) everything works perfectly, as soon as I try to debug on my iPhone 6plus I get only the first 3-4k?? Is there a way to get over this and if so how do I concatenate all the incoming messages to one single message as this is an XML file I need to parse...

@interface ViewController ()

@end

@implementation ViewController

bool connectionError = false;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //[self initNetworkCommunication];

    messages = [[NSMutableArray alloc] init];

}


- (void)initNetworkCommunication {
    CFReadStreamRef readStream;
    CFWriteStreamRef writeStream;
    CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"192.168.1.1", 6035, &readStream, &writeStream);
    inputStream = (__bridge NSInputStream *)readStream;
    outputStream = (__bridge NSOutputStream *)writeStream;

    [inputStream setDelegate:self];
    [outputStream setDelegate:self];

    [inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
    [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

    [inputStream open];
    [outputStream open];

}


- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {

    switch (streamEvent) {

    case NSStreamEventOpenCompleted:
    NSLog(@"Stream opened");
    break;

    case NSStreamEventHasBytesAvailable:

    connectionError = false;
    if (theStream == inputStream) {

    uint8_t buffer[204800];
    int len;

    while ([inputStream hasBytesAvailable]) {
        len = [inputStream read:buffer maxLength:sizeof(buffer)];
        if (len > 0) {

        NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSUTF8StringEncoding];

        if (nil != output) {
        //NSLog(@"server said: %@", output);
        //NSLog(@"message received!");

        [self messageReceived:output];
        }
        }
    }
    }
    break;

    case NSStreamEventErrorOccurred:
    NSLog(@"Can not connect to the host!");
    connectionError = true;
    [self connectionLost];
    break;

    case NSStreamEventEndEncountered:
    break;

    default:
    NSLog(@"Unknown event");
    }

}

- (void) connectionLost {

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alert"
                message:@"Connection to the server lost!"
               delegate:nil
              cancelButtonTitle:@"OK"
              otherButtonTitles:nil];

    [alert show];

}

- (void) messageReceived:(NSString *)message {

    [messages addObject:message];
    //NSLog(@"server said: %@", message);
    //NSLog(@"message received!");

    syncDevices *syncDev = [syncDevices new];
    NSData *data = [message dataUsingEncoding:NSUTF8StringEncoding];

    NSArray *devArr;

    devArr = [syncDev parseDeviceXMLData:data];

    // extra parsing blah blah...

}

- (IBAction)joinChat:(id)sender {

    [self initNetworkCommunication];

    [self sendSocketMessage: @"iam:" message: _inputNameField.text];    
}


- (void) sendSocketMessage:(NSString*) sendCommand message:(NSString*) sendMessage
{
    // do something...

    if (connectionError == true) {
    [self initNetworkCommunication];
    }

    NSString *response  = [NSString stringWithFormat: @"%@%@", sendCommand, sendMessage];
    NSData *data = [[NSData alloc] initWithData:[response dataUsingEncoding:NSASCIIStringEncoding]];
    [outputStream write:[data bytes] maxLength:[data length]];
    NSLog(@"clint sent: %@", response);
}



@end