build packet header, (header + payload)

来源：互联网发布：centos 6.7 修改ip 编辑：程序博客网时间：2024/04/29 14:52

public class Header
    {
        public static byte command = 0x03;
        public static byte[] uName = new byte[] { 0x20, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x01, 0x01, 0x00 };
        public static byte[] password = new byte[] { 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00 };
        public static byte desc;
        public static byte param = 0x00;
        public static byte[] seq = new byte[2];

// desc = 0x01; // change relay
// desc = 0x04; // query output

        public static byte[] getChangeRelayHeader(byte[] _seq)
        {
            desc = 0x01; // change relay status

_seq[0] += Convert.ToByte(1);

seq[0] = _seq[0];
seq[1] = _seq[1];

            List<byte> byteList = new List<byte>();
            byteList.Add(command);
            byteList.AddRange(uName);
            byteList.AddRange(password);
            byteList.Add(desc);
            byteList.Add(param);
            byteList.AddRange(seq);

return byteList.ToArray();
}

        public static byte[] getQueryRelayHeader(byte[] _seq)
        {
            desc = 0x04; // query relay output status

_seq[0] += Convert.ToByte(1);

seq[0] = _seq[0];
seq[1] = _seq[1];

            return byteList.ToArray();
        }
    }

}

// concat header and payload then send
/////////////////////////////////

byte[] headerBytes = Header.getChangeRelayHeader(seq);

byte[] payloadByte = Payload.getControlPayload(_channel, onOff);   // channel, status

IEnumerable<byte> bytesSent = headerBytes.Concat(payloadByte);   // concat header and payload
byte[] bs = bytesSent.ToArray();

socket.Send(bs, 0, 49, SocketFlags.None);

/////////////////////////////////

//byte[] header = { 0x03, // command

    //                                0x20, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55,   //user U 55        len = 23
    //                                0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x01, 0x01, 0x00,

    //                                0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, // passwd P 50       len = 19
    //                                0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x50, 0x00,

    //                                0x01,            // desc 0x01
    //                                0x00,            // param
    //                                0x00, 0x00      // seq
    //                            };