Unable to establish a Socket connection through IOS - ios

Question

Im writing an IOS application for my first time. It is supposed to connect to a static IP device, and send certain "known" commands to it. But for some reason Im unable to establish a connection.
Bellow are the functions I use to establish my connection, and write data to the port.
-(void)connection//:(NSString *)serviceName forIpAddress:(NSString *)ipAddress forPort:(NSString *)portNo
{
if(input && output)
[self close];
NSString *urlString = [NSString stringWithFormat:#"%.%.%.%", "192.168.3.120"];
NSURL *website = [NSURL URLWithString:urlString];
if (!website) {
NSLog(#"%# is not a valid URL", website);
}
CFStreamCreatePairWithSocketToHost(NULL, (__bridge CFStringRef)[website host], 43, &readStream, &writeStream);
CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
NSInputStream *input = (__bridge NSInputStream *)readStream;
NSOutputStream *output= (__bridge NSOutputStream *)writeStream;
}
- (void)open {
[input setDelegate:self];
[output setDelegate:self];
[input scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode];
[output scheduleInRunLoop:[NSRunLoop currentRunLoop]
forMode:NSDefaultRunLoopMode]; [input open];
[output open];
}
-(void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent
{
NSString *event;
switch (streamEvent)
{
case NSStreamEventNone:
event = #"NSStreamEventNone";
break;
case NSStreamEventOpenCompleted:
event = #"NSStreamEventOpenCompleted";
break;
case NSStreamEventHasBytesAvailable:
event = #"NSStreamEventHasBytesAvailable";
if (theStream == input)
{
uint8_t buffer[1024];
NSInteger len;
while ([input hasBytesAvailable])
{
len = [input read:buffer maxLength:1024];
if (len > 0)
{
NSMutableString *output = [[NSMutableString alloc]initWithBytes:buffer length:len encoding:NSUTF8StringEncoding]; NSLog(#"Received data--------------------%#", output);
}
}
}
break;
case NSStreamEventHasSpaceAvailable:
event = #"NSStreamEventHasSpaceAvailable";
break;
case NSStreamEventErrorOccurred:
event = #"NSStreamEventErrorOccurred";
//[self close];
break;
case NSStreamEventEndEncountered:
break; default:
event = #"NSStreamEventEndEncountered";
//[self close];
event = #"Unknown"; break;
}
NSLog(#"event------%#",event);
}
- (void)close
{
[input close];
[output close];
[input removeFromRunLoop:[NSRunLoop currentRunLoop]forMode:NSDefaultRunLoopMode];
[output removeFromRunLoop:[NSRunLoop currentRunLoop]forMode:NSDefaultRunLoopMode];
[input setDelegate:nil];
[output setDelegate:nil];
input = nil;
output = nil;
}
- (void)dataSending:(NSString*)data
{
if(output)
{
if(![output hasSpaceAvailable])
return;
NSData *_data=[data dataUsingEncoding:NSUTF8StringEncoding];
NSInteger data_len = [_data length];
uint8_t *readBytes = (uint8_t *)[_data bytes];
int byteIndex=0;
unsigned int len=0;
while (TRUE)
{
len = ((data_len - byteIndex >= 40960) ? 40960 : (data_len-byteIndex));
if(len==0)
break;
uint8_t buf[len];
(void)memcpy(buf, readBytes, len);
len = [output write:(const uint8_t *)buf maxLength:len];
byteIndex += len;
readBytes += len;
}
NSLog(#"Sent data----------------------%#",data);
}
}
I do call the mentioned functions through that code as a test, and nothing happens
- (IBAction)pumpchange:(id)sender {
[self connection];
[self open];
if ([self.pump backgroundImageForState:(UIControlStateNormal)]==[UIImage imageNamed:#"PumpOff.png"])
{
[self.pump setBackgroundImage:[UIImage imageNamed:#"PumpOn.png"] forState:(UIControlStateNormal)];
[self dataSending:#"pump_on"];
}
else //if ([self.pump backgroundImageForState:(UIControlStateNormal)]==[UIImage imageNamed:#"PumpOn.png"])
{
[self.pump setBackgroundImage:[UIImage imageNamed:#"PumpOff.png"] forState:(UIControlStateNormal)];
[self dataSending:#"pump_off"];
}
[self close];
}
Thanks in Advance

Answer 1

There seem to be some misunderstandings how format strings work, because
NSString *urlString = [NSString stringWithFormat:#"%.%.%.%", "192.168.3.120"];
just gives you the string #"...". Perhaps you meant
NSString *urlString = [NSString stringWithFormat:#"%d.%d.%d.%d", 192, 168, 3, 120];
or
NSString *urlString = [NSString stringWithFormat:#"%s", "192.168.3.120"];
But you don't need a format string at all:
NSString *urlString = #"192.168.3.120";