iOS VoIP Socket connections

Creating a socket connection and sending some data over the socket connection is pretty simple. 

Configuring the connection 

        CFReadStreamRef readStream;

        CFWriteStreamRef writeStream;

        CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"192.168.1.6",5060, &readStream, &writeStream);

        

        self.inputStream = (__bridge_transfer NSInputStream *)readStream;

        self.outputStream = (__bridge_transfer NSOutputStream *)writeStream;

        [self.inputStream setProperty:NSStreamNetworkServiceTypeVoIP forKey:NSStreamNetworkServiceType];

        // Setting the self delegate in input/output stream

        [self.inputStream setDelegate:self];

        [self.outputStream setDelegate:self];

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

        [self.outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

        

        // Open the Connection

        [self.inputStream open];

        [self.outputStream open];

Handlign callbacks 

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode

{

    switch (eventCode) {

        case NSStreamEventNone:

            break;

            

        case NSStreamEventEndEncountered:

            [self printLog:@"Stream Event End"];

            break;

            

        case NSStreamEventErrorOccurred:

            [self printLog:[NSString stringWithFormat:@"Stream error: %@", aStream.streamError]];

            break;

            

        case NSStreamEventHasBytesAvailable:

            if (aStream == self.inputStream)

            {

                uint8_t buffer[1024];

                uint8_t *pongString = (uint8_t *)"Plong!\r\n";

                NSInteger bytesRead = [self.inputStream read:buffer maxLength:1024];

                NSString *stringRead = [[NSString alloc] initWithBytes:buffer length:bytesRead encoding:NSUTF8StringEncoding];

                stringRead = [stringRead stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]];

                

                [self printLog:[NSString stringWithFormat:@"Received: %@", stringRead]];

                [self.outputStream write:pongString maxLength:strlen((char*)pongString)];

                

            }

            break;

            

        case NSStreamEventHasSpaceAvailable:

            if (aStream == self.outputStream)

            {

                if (aStream == self.outputStream)

                {

                    [self.outputStream write:(const uint8_t *)"Plong!\r\n" maxLength:strlen("Plong\r\n")];

                    [self printLog:@"Plong sent"];

                }

            }

            break;

            

        case NSStreamEventOpenCompleted:

            if (aStream == self.inputStream)

            {

                [self printLog:@"NSStreamEventOpenCompleted"];

            }

            break;

            

        default:

            break;

    }

}

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