Daniel's Blog Doing some things in .NET

using System;
using System.IO.Ports;
using System.Text;
using System.Threading;

namespace EasySms
{
    public class GsmModem : IDisposable
    {
        private string comPortName;
        private int baudRate;
        private Parity parity;
        private int dataBits;
        private StopBits stopBits;

        private SerialPort comPort;

        public GsmModem()
        {
            this.comPortName = string.IsNullOrEmpty(SerialPort.GetPortNames()[0]) ? "COM1" : SerialPort.GetPortNames()[0];
            this.baudRate = 115200;
            this.parity = Parity.None;
            this.dataBits = 8;
            this.stopBits = StopBits.One;

            this.SetUpComport();
            this.comPort.Open();
        }

        public GsmModem(string ComPortName)
        {
            this.comPortName = ComPortName;
            this.baudRate = 115200;
            this.parity = Parity.None;
            this.dataBits = 8;
            this.stopBits = StopBits.One;

            this.SetUpComport();
            this.comPort.Open();
        }

        public GsmModem(string ComPortName, int BaudRate, Parity ComParity, int DataBits, StopBits ComStopBits)
        {
            this.comPortName = ComPortName;
            this.baudRate = BaudRate;
            this.parity = ComParity;
            this.dataBits = DataBits;
            this.stopBits = ComStopBits;

            this.SetUpComport();
            this.comPort.Open();
        }

        public bool ModemReady
        {
            get
            {
                comPort.Write("AT" + SpecialCharacter.Return);
                Thread.Sleep(50);
                string answer = ReadComPort();

                if (answer.ToLower().Contains("ok"))
                    return true;
                else
                    return false;
            }
        }

        public bool SimReady
        {
            get
            {
                comPort.Write("AT+CPIN=?" + SpecialCharacter.Return);
                Thread.Sleep(50);
                string answer = ReadComPort();

                if (answer.ToLower().Contains("ready"))
                    return true;
                else
                    return false;
            }
        }

        public SimState ModemSimState
        {
            get
            {
                comPort.Write("AT+CPIN=?" + SpecialCharacter.Return);
                Thread.Sleep(50);
                string answer = ReadComPort();

                string pre = "+cpin: ";

                if (answer.ToLower().Contains(pre + "ready"))
                    return SimState.READY;
                else if (answer.ToLower().Contains(pre + "sim pin"))
                    return SimState.SIM_PIN;
                else if (answer.ToLower().Contains(pre + "sim puk"))
                    return SimState.SIM_PUK;
                else if (answer.ToLower().Contains(pre + "sim pin2"))
                    return SimState.SIM_PIN2;
                else if (answer.ToLower().Contains(pre + "sim puk2"))
                    return SimState.SIM_PUK2;
                else if (answer.ToLower().Contains(pre + "ph-sim pin"))
                    return SimState.PH_SIM_PIN;
                else if (answer.ToLower().Contains(pre + "blocked"))
                    return SimState.BLOCKED;
                else
                    return SimState.ERROR;
            }
        }

        public Encoding ModemEncoding
        {
            get { return this.comPort.Encoding; }
        }

        private string ReadComPort()
        {
            try
            {
                return comPort.ReadExisting();
            }
            catch
            {
                return "ERROR";
            }
            finally
            {
                comPort.DiscardInBuffer();
                comPort.DiscardOutBuffer();
            }
        }

        private void SetUpComport()
        {
            this.comPort = new SerialPort(this.comPortName, this.baudRate, this.parity, this.dataBits, this.stopBits);
            this.comPort.ErrorReceived += new SerialErrorReceivedEventHandler(comPort_ErrorReceived);
            this.comPort.Encoding = Encoding.Default;
            this.comPort.NewLine = SpecialCharacter.Return;
            this.comPort.ReadTimeout = 2500;
            this.comPort.WriteTimeout = 2500;
        }

        private void comPort_ErrorReceived(object sender, SerialErrorReceivedEventArgs e)
        {
            throw new GsmModemException("Error on " + this.comPortName, e.EventType);
        }

        public string ExecuteATCommand(string Command)
        {
            comPort.Write(Command);
            Thread.Sleep(50);
            return ReadComPort();
        }

        public ModemAnswer SetTextMode(SmsTextMode TextMode)
        {
            comPort.Write("AT+CMGF=" + ((int)TextMode).ToString() + SpecialCharacter.Return);
            Thread.Sleep(50);
            string answer = ReadComPort();

            if (answer.ToLower().Contains("ok"))
                return ModemAnswer.OK;
            else
                return ModemAnswer.ERROR;
        }

        public ModemAnswer SetPin(string Pin)
        {
            comPort.Write("AT+CPIN=\"" + Pin + "\"" + SpecialCharacter.Return);
            Thread.Sleep(50);
            string answer = ReadComPort();

            if (answer.ToLower().Contains("ok"))
                return ModemAnswer.OK;
            else
                return ModemAnswer.ERROR;
        }

        public ModemAnswer SendSms(string PhoneNumber, string Message)
        {
            comPort.Write("AT+CMGS=\"" + PhoneNumber + "\"" + SpecialCharacter.Return);
            Thread.Sleep(10);
            comPort.Write(Message + SpecialCharacter.CtrlZ);
            Thread.Sleep(50);
            string answer = ReadComPort();

            if (answer.ToLower().Contains("ok"))
                return ModemAnswer.OK;
            else
                return ModemAnswer.ERROR;
        }

        public ModemAnswer SendSms(string PhoneNumber, string Message, out string CompleteModemAnswer)
        {
            comPort.Write("AT+CMGS=\"" + PhoneNumber + "\"" + SpecialCharacter.Return);
            Thread.Sleep(10);
            comPort.Write(Message + SpecialCharacter.CtrlZ);
            Thread.Sleep(50);
            string answer = ReadComPort();
            CompleteModemAnswer = answer;

            if (answer.ToLower().Contains("ok"))
                return ModemAnswer.OK;
            else
                return ModemAnswer.ERROR;
        }

        #region IDisposable Member

        public void Dispose()
        {
            if (this.comPort != null && this.comPort.IsOpen)
            {
                this.comPort.Close();
            }

            this.comPort.Dispose();
        }

        #endregion
    }
}

namespace EasySms
{
    public enum ModemAnswer
    {
        OK,
        ERROR
    }

    public enum SmsTextMode
    {
        PDU = 0,
        TEXT = 1
    }

    public enum SimState
    {
        READY,
        SIM_PIN,
        SIM_PUK,
        SIM_PIN2,
        SIM_PUK2,
        PH_SIM_PIN,
        BLOCKED,
        ERROR
    }
}