Weather update server in Objective-C

//
// Weather update server
// Binds PUB socket to tcp://*:5556
// Publishes random weather updates
//
#import "ZMQObjC.h"
#import "ZMQHelper.h"

int
main(void)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

// Prepare our context and publisher
ZMQContext *ctx = [[[ZMQContext alloc] initWithIOThreads:1U] autorelease];
ZMQSocket *publisher = [ctx socketWithType:ZMQ_PUB];
[publisher bindToEndpoint:@"tcp://*:5556"];
[publisher bindToEndpoint:@"ipc://weather.ipc"];

// Initialize random number generator
srandom ((unsigned) time (NULL));
for (;;) {
// Get values that will fool the boss
int zipcode, temperature, relhumidity;
zipcode = within (100000);
temperature = within (215) - 80;
relhumidity = within (50) + 10;

// Send message to all subscribers
NSString *update = [NSString stringWithFormat:@"%05d %d %d",
zipcode, temperature, relhumidity];
NSData *data = [update dataUsingEncoding:NSUTF8StringEncoding];
[publisher sendData:data withFlags:0];
}
[publisher close];
[pool drain];
return EXIT_SUCCESS;
}