Sending Multicast UDP by GCDAsyncUdpSocket fails, no activity in Wireshark

问题

It works okay for any known IP like this:

[udpSocket sendData:datatosend toHost:@"192.168.1.113" port:port withTimeout:-1 tag:0];

But when i'm trying to use broadband multicast, nothing logged and nothing goes on

[udpSocket sendData:datatosend toHost:@"192.168.1.255" port:port withTimeout:-1 tag:0];

receiving works okay, i also tried 255.255.255.255 - the same. it doesn't give any error.

回答1:

I found the solution:

[udpSocket enableBroadcast:YES error:nil]; 

来源：https://stackoverflow.com/questions/9728285/sending-multicast-udp-by-gcdasyncudpsocket-fails-no-activity-in-wireshark