self.udpSocekt = [[GCDAsyncUdpSocket alloc] initWithDelegate:self
                                               delegateQueue:dispatch_get_main_queue()];
NSError *udpError = nil;
[self.udpSocekt enableBroadcast:YES
                          error:&udpError];
[self.udpSocekt sendData:someData
                  toHost:255.255.255.255
                    port:25525
             withTimeout:-1
                     tag:0];