/**
 *包的類型的定義,
 */
public class PacketCode {
    public static final byte RRQ 	 = 1;  //讀請求讀取包
    public static final byte WRQ 	 = 2;  //寫請求發(fā)送包
    public static final byte DATA 	 = 3;  //數據包
    public static final byte ACK 	 = 4;  //確認包
    public static final byte ERROR	 = 5;  //錯誤包
}