EAAccessory Notification problem

Question

Hi,

I am using a POS device for card swipe. its working good. i have used following codes.

- (id) init
{
self = [super init];
if (self != nil)
{
NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
EAAccessoryManager *accessoryMamaner  = [EAAccessoryManager sharedAccessoryManager];

[accessoryMamaner registerForLocalNotifications];
[notificationCenter addObserver: self  selector: @selector (accessoryDidConnect:)   name: EAAccessoryDidConnectNotification object: nil];
[notificationCenter addObserver: self  selector: @selector (accessoryDidDisconnect:)   name: EAAccessoryDidDisconnectNotification object: nil];

NSArray *accessories = [accessoryMamaner connectedAccessories]; 
accessory = nil; 

session = nil; 

for (EAAccessory *obj in accessories)
{ 
if ([[obj protocolStrings] containsObject:@"com.XXXXX"] || [[obj protocolStrings] containsObject:@"com.YYYYYY"] )
{ 
accessory = obj; 
break;
}
} 

if (accessory)
{ 
session = [[EASession alloc] initWithAccessory:accessory  forProtocol:@"com.dailysystems.DS247"]; 
if (!session) session = [[EASession alloc] initWithAccessory:accessory  forProtocol:@"com.usaepay.ipos"];

if (session)
{
self.deviceConnected = YES;
[[session inputStream] setDelegate:self]; 
[[session inputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop]  forMode:NSDefaultRunLoopMode]; 
[[session inputStream] open]; 

[[session outputStream] setDelegate:self]; 
[[session outputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop]  forMode:NSDefaultRunLoopMode]; 
[[session outputStream] open]; 
}
else
{
UIAlertView *accessoryInfo = [[UIAlertView alloc] initWithTitle:@"Alert!" message:@"Hardware is not connected." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[accessoryInfo show]; [accessoryInfo release];
}
} 
}
return self;
}

When i disconnect the accessory it gives me accessoryDidDisconnect and when i connect it gives me accessoryDidConnect, But Problem is after that accessory stop working it does not respond to command. i tried to release the alloc and alloc again but no use. Please tell me if some one have any idea how to get the accessory work again. Thanks in advance.