NSStream not giving any data - ios

Question

I'm trying to write telnet client on iOS and I can't set up streams correctly. I think that they work, but I am getting empty buffer each time I get delegate method triggered.
Here is how I set up streams:
self.manager = [[TelnetManager alloc] init];
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)[[NSURL URLWithString:#"arda.pp.ru"] host], 7000, &readStream, &writeStream);
NSInputStream *inputStream = (__bridge_transfer NSInputStream *)readStream;
NSOutputStream *outputStream = (__bridge_transfer NSOutputStream *)writeStream;
[inputStream setDelegate:self.manager];
[outputStream setDelegate:self.manager];
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[inputStream open];
[outputStream open];
Here is the delegate method that is on manager that handles events:
-(void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
{
if (eventCode == NSStreamEventHasBytesAvailable) {
NSLog(#"We got some data over here");
if(!_data) {
_data = [NSMutableData data];
}
uint8_t buf[1024];
unsigned int len = 0;
len = [(NSInputStream *)aStream read:buf maxLength:1024];
NSLog(#"length - %d", len);
NSLog(#"buf:%s", buf);
if(len) {
[_data appendBytes:(const void *)buf length:len];
_bytesRead = #([_bytesRead intValue]+len);
} else {
NSLog(#"no buffer!");
}
}
}
It is getting fired, but buffer is always empty and "no buffer" is logged.
What's wrong with my code?

Answer 1

There actually is nothing wrong with your code. I have used it to connect to a telnet server and it worked fine.
In your code, "no buffer" is logged when len is 0, which means the buffer's end has been reached. In the case of a telnet server, this usually means that either the server disconnected your connection or the server quit.