Objective-C class for sending data via UDP

UDPClient.h

//
//  UDPClient.h
//  ParticleCar
//
//  Created by Jakob Egger on 06/11/2016.
//  Copyright © 2016 Egger Apps. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface UDPClient : NSObject

@property uint16_t destPort;
@property NSString * __nullable destIP;
@property BOOL broadcast;

-(__nonnull instancetype)initWithDestinationIP:(NSString* __nonnull)destIP port:(uint16_t)destPort;
-(BOOL)sendMessage:(NSData* __nonnull)data error:(NSError* __null_unspecified * __nullable)error;

@end

UDPClient.m

//
//  UDPClient.m
//  ParticleCar
//
//  Created by Jakob Egger on 06/11/2016.
//  Copyright © 2016 Egger Apps. All rights reserved.
//

#import "UDPClient.h"

#import <sys/types.h>
#import <sys/uio.h>
#import <sys/socket.h>
#import <sys/un.h>
#import <sys/select.h>
#import <sys/time.h>
#import <netdb.h>
#import <unistd.h>
#include <arpa/inet.h>

@implementation UDPClient

-(instancetype)initWithDestinationIP:(NSString*)destIP port:(uint16_t)destPort;
{
	self = [super init];
	if (self) {
		_destIP = destIP;
		_destPort = destPort;
	}
	return self;
}

-(BOOL)sendMessage:(NSData*)data error:(NSError**)error;
{
	struct sockaddr_in addr;
	bzero(&addr, sizeof addr);
	addr.sin_family = AF_INET;
	addr.sin_len = sizeof addr;
	addr.sin_port = htons(self.destPort); // <-- doesn't really matter, not sending from receiver
	inet_pton(AF_INET, self.destIP.UTF8String, &addr.sin_addr);
	
	NSLog(@"sending to %@", self.destIP);
	
	int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
	if (sock<0) {
		if (error) {
			*error = [NSError errorWithDomain:@"UDPClient" code:errno userInfo:@{NSLocalizedDescriptionKey:[NSString stringWithFormat:@"socket() failed: %s", strerror(errno)]}];
		}
		return NO;
	}
	
	if (self.broadcast) {
		int yes = 1;
		if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &yes, sizeof yes) == -1) {
			if (error) {
				*error = [NSError errorWithDomain:@"UDPClient" code:errno userInfo:@{NSLocalizedDescriptionKey:[NSString stringWithFormat:@"setsockopt() failed: %s", strerror(errno)]}];
			}
			close(sock);
			return NO;
		}
	}
	
	if (connect(sock, (struct sockaddr*)&addr, addr.sin_len) == -1) {
		if (error) {
			*error = [NSError errorWithDomain:@"UDPClient" code:errno userInfo:@{NSLocalizedDescriptionKey:[NSString stringWithFormat:@"connect() failed: %s", strerror(errno)]}];
		}
		close(sock);
		return NO;
	}
	
	int bytesSent = send(sock, data.bytes, data.length, 0);
	
	if (bytesSent == -1) {
		if (error) {
			*error = [NSError errorWithDomain:@"UDPClient" code:errno userInfo:@{NSLocalizedDescriptionKey:[NSString stringWithFormat:@"send() failed: %s", strerror(errno)]}];
		}
		close(sock);
		return NO;
	}
	else if (bytesSent != data.length) {
		if (error) {
			*error = [NSError errorWithDomain:@"UDPClient" code:errno userInfo:@{NSLocalizedDescriptionKey:[NSString stringWithFormat:@"Unexpected number of bytes sent (%d instead of %d", bytesSent, (int)data.length]}];
		}
		close(sock);
		return NO;
	}
	
	close(sock);
	return YES;
}

@end