Node JS udp broadcast not read -- node js and iOS - ios

Question

here is my code (javascript for node):
var dgram = require('dgram');
var message = new Buffer("why hello beautiful");
var client = dgram.createSocket("udp4");
client.bind(41234);
client.setBroadcast(true);
client.send(message, 0, message.length, 41234, "134.71.147.255");
console.log('msg sent');
client.close();
here is the ifconfig for my computer running node (the only pertinent thing I think -- correct me if im wrong please):
inet addr:134.71.146.49 Bcast:134.71.147.255 Mask:255.255.254.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
The udp broacast is neither recieved on my iOS app nor visible through a packet inspector.
What is going wrong?! The iOS app uses the GCDAsyncUdpSocket framework:
- (void) initUDPlistener {
NSLog(#"initUDPlistener");
udpSocket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()];
NSError *error = nil;
if (![udpSocket bindToPort:UDP_PORT error:&error]) //does the port matter? i dont know
{
return;
}
if (![udpSocket beginReceiving:&error])
{
return;
}
[udpSocket enableBroadcast:YES error:nil];
[udpSocket sendData:[self pack:#"iOS to bcast"] toHost:UDP_BCAST_ADDR port:UDP_PORT withTimeout:-1 tag:0];
}
#pragma mark -
#pragma mark Delegate UDP methods
- (void)udpSocket:(GCDAsyncUdpSocket *)sock didReceiveData:(NSData *)data
fromAddress:(NSData *)address
withFilterContext:(id)filterContext
{
NSLog(#"niets.");
NSString *msg = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
if (msg)
{
NSLog(#"iets gekregen");
}
else
{
NSLog(#"Error convertion");
}
NSLog(#"HMMMM");
}
-(void) udpSocket:(GCDAsyncUdpSocket *) sock didSendDataWithTag:(long)tag {//called. and packet inspector recieves the packet when it is sent OUT from the iOS app.
NSLog(#"written data tag: %ld", tag);
}
-(void) udpSocket:(GCDAsyncUdpSocket *)sock didConnectToAddress:(NSData *)address { //never called
NSLog(#"connected to some address");
}
What happens:
"didReceiveData" does not get called from the node broadcast. It gets called when it sends its own message out, however.
the iOS app, on the other hand, successfully broadcasts and i am able to intercept that packet on my packet inspector. The same packet inspector does not show packets that should be originating from Node, however.
what am I doing wrong in node? I think what I am doing in node is the problem.