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POTrying to send telnet commands to a server
 

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  1. POTrying to send telnet commands to a server
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    <p>I'm trying to connect to a telnet server (running NetLinx by AMX, in case it matters) and send it a few commands as if I opened Terminal and did "telnet (address)" and started typing commands. I can receive messages but can't send them using this code I found from a tutorial at <a href="http://www.raywenderlich.com/3932/how-to-create-a-socket-based-iphone-app-and-server" rel="nofollow">http://www.raywenderlich.com/3932/how-to-create-a-socket-based-iphone-app-and-server</a>:</p> <pre><code>- (void)sendMessage: (NSString*) message{ //called when the user interacts with UISwitches, is supposed to send message to server NSData *data = [[NSData alloc] initWithData:[message dataUsingEncoding:NSASCIIStringEncoding]]; //is ASCIIStringEncoding what I want? [outputStream write:[data bytes] maxLength:[data length]]; NSLog(@"Sent message to server: %@", message); } - (void)initNetworkCommunication { //called in viewDidLoad of the view controller CFReadStreamRef readStream; CFWriteStreamRef writeStream; CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"192.168.1.90", 23, &amp;readStream, &amp;writeStream); //192.168.1.90 is the server address, 23 is standard telnet port inputStream = (__bridge NSInputStream *)readStream; outputStream = (__bridge NSOutputStream *)writeStream; [inputStream setDelegate:self]; [outputStream setDelegate:self]; [inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [inputStream open]; [outputStream open]; } </code></pre> <p>It appears to send some kind of message to the server <em>but maybe in the wrong format</em>. My guess is that it's a string formatting problem. Is ASCII what I want to use for telnet? If I take the message it prints when it sends a command and paste that right into Terminal with telnet running, the server receives and processes the command normally.</p> <p>Here is an example command that I'm trying to send: SEND_STRING dvJAND,"'#AUX2=0',$0D"</p> <p>Another mystery is that, reading the input stream and printing, I see this when the above is sent:</p> <pre><code>2013-08-20 00:20:23.791 [7548:907] server said: S 2013-08-20 00:20:23.793 [7548:907] server said: END_STRING dvJAND,"'#AUX 2013-08-20 00:20:23.795 [7548:907] server said: 2=0',$0D" </code></pre> <p>But when I type that command in Terminal, the server does not respond at all and does its job as it should.</p>
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    1. COThe telnet protocol is defined in http://tools.ietf.org/html/rfc854, if that helps.
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