ios开发之发送UDP广播并接收数据

用了asyncUdpSocket, 服务端在接收到广播后，就会做出回应，然后就可以开始通讯了。

 

- (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");

}