how can i Iphone EAAccessory callback speed modify?

Question

i'am test my bluetooth device connectting and data read.

but data read callback time is very slow. callback Interval time 100ms..

how can i read callback time fastest?

- (void)openSessionForProtocol
{
  NSString *protocolString = @"com.company.datapath";
  NSArray *accessories = [[EAAccessoryManager sharedAccessoryManager] connectedAccessories];
     EAAccessory *accessory = nil;

     for (EAAccessory *obj in accessories)
    {
        if ([[obj protocolStrings] containsObject:protocolString])
        {
            accessory = obj;
            break;
        }
    }

 NSLog(@"%@",accessory);

    if (accessory)
    {
        m_session = [[EASession alloc] initWithAccessory:accessory
         forProtocol:protocolString];

        if (m_session)
        {
            [[m_session inputStream] setDelegate:self];
            [[m_session inputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

            [[m_session inputStream] open];

        }

    } 
}

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

   int len;
            char buffer[1024];
   while ([[m_session inputStream] hasBytesAvailable])
   {
    len = [[m_session inputStream] read:buffer maxLength:sizeof(buffer)];
            }
  }
    }
}

i'm sorry. I can't speak English well. thank you