短信发送报告AT命令

我正在做一个项目，我必须向人发送短信。如果对方没有收到短信，我就得再发一次。所以，我需要成功的短信交付报告。如何获取和阅读短信发送状态或报告?我使用SIMCOM 800设备，项目语言是c#.net(控制台应用程序)。

Program.cs

public void SendSMS(string sim, string message)
        {
            //.............................................. Send SMS ....................................................
            try
            {
                if (objclsSMS.sendMsg(this.port, sim, message))
                {
                    //MessageBox.Show("Message has sent successfully");
                    Console.WriteLine("Message has sent successfully");
                }
                else
                {
                    //MessageBox.Show("Failed to send message");
                    Console.WriteLine("Failed to send message");
                }
                //Console.ReadLine();
            }
            catch (Exception ex)
            {
                ErrorLog(ex.Message);
            }
        }

clcSMS.cs

    #region Send SMS
            static AutoResetEvent readNow = new AutoResetEvent(false);
            public bool sendMsg(SerialPort port, string PhoneNo, string Message)
             {
                bool isSend = false;
                try
                {
                    string recievedData = ExecCommand(port, conncetioncmd, 300, "No phone connected");
                    recievedData = ExecCommand(port, msgformatcmd, 300, "Failed to set message format.");
                    //recievedData = ExecCommand(port, "AT+CSMP=49,167,0,242", 300, "Failed to accept phoneNo");
                    //recievedData = ExecCommand(port, "AT+CNMI=1.0.0.1.0", 300, "Failed to accept phoneNo");
                    //recievedData = ExecCommand(port, "AT+CNMI=1,1,0,0,0", 300, "Failed to accept phoneNo");
                    //recievedData = ExecCommand(port, "AT+CNMI=1,0,0,1,0", 300, "Failed to accept phoneNo");
                    //recievedData = ExecCommand(port, "AT+CNMI=2,2,0,0,0", 300, "Failed to accept phoneNo");
                    //recievedData = ExecCommand(port, "AT+CNMI=2", 300, "Failed to accept phoneNo");
                    //recievedData = ExecCommand(port, "AT+CSMP=49,167,0,0", 300, "Failed to accept phoneNo");
                    //recievedData = ExecCommand(port, "AT+CNMI=2,2,0,1,0", 300, "Failed to accept phoneNo");
                    //recievedData = ExecCommand(port, "AT+CSAS", 300, "Failed to accept phoneNo"); 
                    String command = msgcmd + PhoneNo + "'"";
                    recievedData = ExecCommand(port,command, 300, "Failed to accept phoneNo");
                    command = Message + char.ConvertFromUtf32(26) + "'r";
                    recievedData = ExecCommand(port,command, 3000, "Failed to send message"); //3 seconds
                    if (recievedData.EndsWith("'r'nOK'r'n"))
                    {
                        isSend = true;
                    }
                    else if (recievedData.Contains("ERROR"))
                    {
                        isSend = false;
                    }
                    return isSend;
                }
                catch (Exception ex)
                {
                    throw ex; 
                }
            }     
            static void DataReceived(object sender, SerialDataReceivedEventArgs e)
            {
                try
                {
                    if (e.EventType == SerialData.Chars)
                        readNow.Set();
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
            #endregion
  public string ExecCommand(SerialPort port,string command, int responseTimeout, string errorMessage)
        {
            try
            {
                port.DiscardOutBuffer();
                port.DiscardInBuffer();
                receiveNow.Reset();
                port.Write(command + "'r");
                string input = ReadResponse(port, responseTimeout);
                if ((input.Length == 0) || ((!input.EndsWith("'r'n> ")) && (!input.EndsWith("'r'nOK'r'n"))))
                    throw new ApplicationException("No success message was received.");
                return input;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }   

谁能给我指个正确的方向?