package yaokong;

public class BluetoothProtocol {
    // 协议常量
    public static final byte[] FRAME_HEADER = {(byte) 0xAA, (byte) 0x55};
    public static final byte FRAME_FOOTER = 0x0D;
    
    // 指令类型
    public static final byte CMD_PATH = 0x01;
    public static final byte CMD_BASE_STATION = 0x02;
    public static final byte CMD_STEERING = 0x03;
    public static final byte CMD_CONTROL = 0x04;
    public static final byte CMD_RESPONSE = (byte) 0x80;
    
    // 错误码
    public static final byte ERROR_SUCCESS = 0x00;
    public static final byte ERROR_CRC = 0x01;
    public static final byte ERROR_LENGTH = 0x02;
    
    private static int sequenceNumber = 0;
    
    // 获取下一个递增的序列号用于区分指令
    public static synchronized int getNextSequence() {
        sequenceNumber = (sequenceNumber + 1) & 0xFFFF;
        return sequenceNumber;
    }
}