iOS-GCDAsyncUdpSocket抛出错误域=NSPOSIXErrorDomain Code=65“；“没有到主机的路线”；

有时我会犯这样的错误

错误域=NSposiXerorDomain代码=65“没有到主机的路由” UserInfo={NSLocalizedDescription=没有到主机的路由， NSLocalizedFailureReason=发送（）函数中出现错误。}

在某些路由器中打开udp套接字时。我不知道这是什么原因

这是我打开udp套接字的代码：

- (void)openSocket
{
    if(_asyncUdpSocket == nil)
    {
        _asyncUdpSocket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)];
    }

    if(![_asyncUdpSocket isClosed])
    {
        return;
    }

    NSError *error;

    if (![_asyncUdpSocket enableBroadcast:YES error:&error])
    {
        NSLog(@"AsyncUdp: enable broadcast failed error: %@", error);
    }

    if (![_asyncUdpSocket bindToPort:_port error:&error])
    {
        NSLog(@"AsyncUdp: bind to port %li failed error: %@", (unsigned long)_port, error);
    }

    if (![_asyncUdpSocket joinMulticastGroup:_address error:&error])
    {
        NSLog(@"AsyncUdp: join multicast group %@ failed error: %@", _address, error);
    }

    if(![_asyncUdpSocket beginReceiving:&error])
    {
        NSLog(@"AsynUdp: begin receiving error: %@", error);
    }

    if(error != nil)
    {
        NSLog(@"Udp failed to open!");

        [_delegate onUdpSocketDidOpenfailed];
    }

    else
    {
        NSLog(@"UdpSocket - opend udp socket successful!");

        [_delegate onUdpSocketDidOpen];
    }
}

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请注意，这种情况在iPhone 7中经常发生

在将Xcode更新到12.5版后，我在运行DLNA应用程序项目时遇到了同样的问题。我通过将Xcode降级到12.4版来修复它