private string PackSlipMessage_temp(string message)
        {
            var resp = new StringBuilder();

            resp.Append(message);
            //resp.Replace("\r\n", "\0");
            //resp.Replace("\\", "\0x01");
            //resp.Replace("`", "\0x02");
            //resp.Replace("\n", "\0x03");
            //resp.Append('\0');
            resp.Append(CrcCalculator.CRC_8(Encoding.UTF8.GetBytes(resp.ToString())));
            return(resp.ToString());
        }
        private string PackSlipMessage(string message)
        {
            var resp = new StringBuilder();

            resp.Append(message);
            resp.Replace("\r\n", "\0");
            resp.Replace("\\", "\0x01");
            resp.Replace("`", "\0x02");
            resp.Replace("\n", "\0x03");
            resp.Append('\0');
            resp.Append(CrcCalculator.CRC_8(Encoding.UTF8.GetBytes(resp.ToString())));
            //Console.WriteLine("Pack message is:----------{0}",resp);
            return(resp.ToString());
        }