writeData: does not send out data for 5-10 minutes

[Andreas Höschler]

Hi all,

I am opening a socket on one machine and do

      [[NSNotificationCenter defaultCenter] addObserver:self 
selector:@selector(connectionAccepted:)
        name:FBConnectionAcceptedNotification object: nil];
      [self acceptConnectionInBackgroundAndNotify];     

I connect to this socket from another machine. This fires the following 
method:

- (void)connectionAccepted:(NSNotification *)notification
{
   NSFileHandle *clientHandle = [[notification userInfo] 
objectForKey:NSFileHandleNotificationFileHandleItem];
   [clientHandle readInBackgroundAndNotify];
}

On the remote machine I send stuff using

        - [NSFileHandle writeData:]

and wait for

        - (void)readCompleted:(NSNotification *)notification

being called on the server end. This basically works. However, 
sometimes it takes 5 or more minutes before the data is received by the 
server. I assume that since I only sent a few bytes only and the data 
is kept until either more data is queued for transmission or a timeout 
occurs before the data is actually sent over the line. Can anybody 
confirm this assumption? What can i do about it? What I am looking for 
is some kind of flush mechanism (in NSFileHandle or directly on the 
socket) that sends out the data immediately regardless of how small the 
package is.

Thanks a lot!

Regards,

  Andreas