Broadcast message to LAN

[savage309]

Hi.
I need to broadcast message at a specific port to all devices, that are in my LAN.
I have done that on Android just by sending message to 255.255.255.255:PORT. This is my obj-c code, which does not seems to work :

-(void) initNetworkCommunication
{
    CFReadStreamRef readStream;
    
    CFWriteStreamRef writeStream;
    CFStreamCreatePairWithSocketToHost(NULL, (CFStringRef)@"255.255.255.255", 8888, &readStream, &writeStream);
    inputStream = objc_unretainedObject(readStream);
    outputStream = objc_unretainedObject(writeStream);
    
    [inputStream setDelegate:self];
    [outputStream setDelegate:self];
    
    [inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
    [outputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
    
    [inputStream open];
    [outputStream open];
    
    [self sendMessage];
}

-(void) sendMessage
{
    NSString *response  = [NSString stringWithFormat:@"Ping"];
	NSData *data = [[NSData alloc] initWithData:[response dataUsingEncoding:NSASCIIStringEncoding]];
	[outputStream write:[data bytes] maxLength:[data length]];
}

If i type some real IP (192.168.X.X) everything works fine ..

So .. is there a way to broadcast message to all the devices with an iOS

[newDev]

Maybe this will help:
RSU: iPhone Programming: Creating Network Socket Connections

[savage309]

Nope.
I do basically the same. The point is that I want to send message not to a specific IP address, but to all devices in the local network ..

[savage309]

Sorry, I am an idiot.
255.255.255.255 send to everybody ELSE and since Im testing on ONE MAC I don't receive the message
But it should work .. will write later if this theory gets confirmed.

[newDev]

Is the port on the mac accepting incoming messages? I dont think you can send a message to a device that isn't open to accepting it. I have done something like this with a mini python chat server.