iosGCDAsyncSocket收不到服务器的数据，发送数据正常

问题： ios GCDAsyncSocket收不到服务器的数据，发送数据正常
描述:

-(void)startConnectSocket{
self.socket =[[GCDAsyncSocket alloc]initWithDelegate:self delegateQueue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0)];
    if (![self.socket isConnected]) {
        NSError * error=nil;
        if ( [self.socket connectToHost:HOST onPort:POST error:&error]) {
            NSLog(@"%@",[error description]);
        }
        else{
            
            NSLog(@"失败");
        }
    }
    
  }
#pragma mark当链接成功时就会调用
-(void)socket:(GCDAsyncSocket *)sock didConnectToHost:(NSString *)host port:(uint16_t)port{
      NSLog(@"%@",host);
    //    self.HearTimer=[NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector(checkLongConnectByServe) userInfo:nil repeats:YES];
    
   // [self checkLongConnectByServe];
      // [sock readDataToData:[GCDAsyncSocket LFData] withTimeout:-1 tag:200];
   // [self.HearTimer fire];
    
        //等待服务器消息，
    NSLog(@"%@",[NSThread currentThread]);
         [sock readDataWithTimeout:-1 tag:200];
}
#pragma mark当服务器给客服端发送消息时调用
-(void)socket:(GCDAsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{
    
        NSMutableDictionary  * dicData=   [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
        
        NSLog(@"%@",dicData);
       [sock readDataWithTimeout:-1 tag:200];
   }
[size=16px]  第一次链接，服务器就会给客服端发送数据，可是接受不到，为什么？？[/size]