Ndtyjky

I have an iOS app in the app store. I'm working on some new features for it. I am working on Weighing Machine & requirement to register weight in system using telnet connection.
Using following code I make telnet connection with Weighing Machine

- (void)initNetworkCommunication {



uint portNo = 23;

CFReadStreamRef readStream;

CFWriteStreamRef writeStream;

CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"227.3.4.56", portNo, &readStream, &writeStream);

inputStream = (__bridge NSInputStream *)readStream;



[inputStream setDelegate:self];



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

[inputStream open];}

Received data in delegate method

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

uint8_t buffer[1024];

int len;



switch (streamEvent) {



    case NSStreamEventOpenCompleted:

        NSLog(@"Stream opened now");

        break;

    case NSStreamEventHasBytesAvailable:

        NSLog(@"has bytes");

        if (theStream == inputStream) {

            while ([inputStream hasBytesAvailable]) {

                len = [inputStream read:buffer maxLength:sizeof(buffer)];

                if (len > 0) {



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



                    if (nil != output) {

                        NSLog(@"server said: %@", output);

                    }

                }

            }

        } else {

            NSLog(@"it is NOT theStream == inputStream");

        }

        break;

    case NSStreamEventHasSpaceAvailable:

        NSLog(@"Stream has space available now");

        break;





    case NSStreamEventErrorOccurred:

        NSLog(@"Can not connect to the host!");

        break;





    case NSStreamEventEndEncountered:



        [theStream close];

        [theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];



        break;



    default:

        NSLog(@"Unknown event %i", streamEvent);

}}

Weighing Machine is continuously posting same data in fraction of seconds because of that thread is blocked & not able to execute further code. To avoid this situation What I did is close connection of inputStream once I will get data very first time in NSStreamEventHasBytesAvailable.

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

uint8_t buffer[1024];

int len;



switch (streamEvent) {



    case NSStreamEventOpenCompleted:

        NSLog(@"Stream opened now");

        break;

    case NSStreamEventHasBytesAvailable:

        NSLog(@"has bytes");

        if (theStream == inputStream) {

            while ([inputStream hasBytesAvailable]) {

                len = [inputStream read:buffer maxLength:sizeof(buffer)];

                if (len > 0) {



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



                    if (nil != output) {

                        NSLog(@"server said: %@", output);



                        [theStream close];

                        [theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

                   }

                }

            }

        } else {

            NSLog(@"it is NOT theStream == inputStream");

        }

        break;

    case NSStreamEventHasSpaceAvailable:

        NSLog(@"Stream has space available now");

        break;





    case NSStreamEventErrorOccurred:

        NSLog(@"Can not connect to the host!");

        break;





    case NSStreamEventEndEncountered:



        [theStream close];

        [theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];



        break;



    default:

        NSLog(@"Unknown event %i", streamEvent);

}}

Problem Statement

After closing Connection when I am try to get data on next time after reconnection it is always giving blank response & connection closes. I need data when I make reconnection always. Please guide