I am using a device called a WiFly that has ip address:169.254.1.1 and port 2000. I am trying to connect to this device via an iOS application. I use the following code to connect:
CFReadStreamRef readStream;
CFWriteStreamRef writeStream;
UInt32 port = 2000;
CFStringRef host = CFSTR("169.254.1.1");
CFStreamCreatePairWithSocketToHost(kCFAllocatorDefault, host, port, &readStream, &writeStream);
inputStream = (__bridge NSInputStream *)readStream;
outputStream = (__bridge NSOutputStream *)writeStream;
// set the delegates to this view controller
[inputStream setDelegate:self];
[outputStream setDelegate:self];
// Set run loops to continuous receive information
[inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
// Finally, open the connection
[inputStream open];
[outputStream open];
Then I use the following to handle stream events:
- (void)stream:(NSStream *)theStream handleEvent:(NSStreamEvent)streamEvent {
NSLog(@"stream event %i", streamEvent);
switch (streamEvent) {
case NSStreamEventOpenCompleted:
NSLog(@"Stream opened");
break;
case NSStreamEventHasBytesAvailable:
if (theStream == inputStream) {
uint8_t buffer[1024];
int len;
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);
[self messageReceived:output];
}
}
}
}
break;
case NSStreamEventErrorOccurred:
NSLog(@"Can't connect to server");
break;
case NSStreamEventEndEncountered:
[theStream close];
[theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
break;
default:
NSLog(@"Unknown event");
}
So, I can see that the first two streams are opened correctly. Then it follows immediately with a stream event 4, which from my understanding is to be expected. However, I then try to call a function:
- (IBAction)moveForward
{
NSLog(@"move forward called");
NSString *response = [NSString stringWithFormat:@"2"];
NSData *data = [[NSData alloc] initWithData:[response dataUsingEncoding:NSASCIIStringEncoding]];
[outputStream write:[data bytes] maxLength:[data length]];
}
Which should return "forward" from an arduino uno via the wifly. However, when I click, I get another NSStreamEvent 4 for some reason. I also telnetted in to the device via the terminal with:
telnet 169.254.1.1 2000
and subsequently type a "2"... This returned the desired "forward" immediately. What am I doing wrong from the perspective of the iPad?
Additionally, this code was working a couple weeks ago. But once I updated the simulator, it stopped working... The connection is opening properly, but the arduino device does not seem to be getting the output from the iOS.
Help is much appreciated!
