用了
asyncudpsocket, 服務端在接收到廣播後，就會做出回應，然後就可以開始通訊了。
- (void)init{
asyncudpsocket *socket=[[asyncudpsocketalloc]initwithdelegate:self];
[socketlocalport:16747];
nstimeinterval timeout=5000;
nsstring *request=@"quick_stat";
nsdata *data=[nsdatadatawithdata:[request datausingencoding:nsasciistringencoding] ];
uint16 port=8081;
nserror *error;
[socket enablebroadcast:yeserror:&error];
[socket senddata :data tohost:@"255.255.255.255" port:port withtimeout:timeout tag:1];
[socket receivewithtimeout:-1tag:0];
nslog(@"begin scan");
- (bool)onudpsocket:(asyncudpsocket *)sock didreceivedata:(nsdata *)data withtag:(long)tag fromhost:(nsstring *)host port:(uint16)port{
nsstring* result;
result = [[nsstringalloc] initwithdata:data encoding:nsasciistringencoding];
nslog(@"%@",result);
nslog(@"received");
-(bool)onudpsocket:(asyncudpsocket *)sock didnotreceivedatawithtag:(long)tag duetoerror:(nserror *)error{
nslog(@"not received");
-(bool)onudpsocket:(asyncudpsocket *)sock didnotsenddatawithtag:(long)tag duetoerror:(nserror *)error{
nslog(@"%@",error);
nslog(@"not send");
-(bool)onudpsocket:(asyncudpsocket *)sock didsenddatawithtag:(long)tag{
nslog(@"send");
-(bool)onudpsocketdidclose:(asyncudpsocket *)sock{
nslog(@"closed");
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