Question

这是我的代码（节点的javascript）：

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();

这是我的计算机运行节点的ifconfig（我认为唯一相关的事情 - 如果我错了请纠正我）：

inet addr:134.71.146.49  Bcast:134.71.147.255  Mask:255.255.254.0
UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

我的iOS应用程序既没有收到udp broacast，也没有通过数据包检查员看到udp broacast。出了什么问题？！ iOS应用程序使用GCDAsyncUdpSocket框架：

- (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");
}

会发生什么： “didReceiveData”不会从节点广播中调用。但是，当它发送自己的消息时会被调用。

另一方面，iOS应用程序成功广播，我能够拦截我的数据包检查器上的数据包。但是，相同的数据包检查器不会显示应该来自Node的数据包。

我在节点中做错了什么？我认为我在节点中所做的是问题。

节点JS udp广播不读 - 节点js和iOS

0 个答案: