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

namespace TestObdScanner
{
    public class ObdDevice
    {
        private string PortName;
        private int BaudRate;
        private int ReadTimeOut;
        private SerialPort Port;

        public ObdDevice(string portName, int baudRate)
        {
            PortName = portName;
            BaudRate = baudRate;
            ReadTimeOut = 1000;
            Port = new SerialPort(PortName, BaudRate);
        }

        public ObdDevice(string portName, int baudRate, int readTimeOut)
        {
            PortName = portName;
            BaudRate = baudRate;
            ReadTimeOut = readTimeOut;
            Port = new SerialPort(PortName, BaudRate);
        }

        public bool Connect()
        {
            if (Port != null)
            {
                try
                {
                    Port.Open();
                    Port.DataReceived += new SerialDataReceivedEventHandler(Port_DataReceived);
                }
                catch (Exception OpenExcep)
                {
                    Console.WriteLine(OpenExcep.Message);
                    return false;
                }
            }
            else
            {
                Console.WriteLine("Error: Tried to connect with a null port");
            }
            return true;
        }

        public void TestAllPids()
        {
            int MaxDecimalPid = 78;
            StringBuilder Command = new StringBuilder(6);

            for (int i = 1; i <= MaxDecimalPid; i++)
            {
                Command.AppendFormat("01 {0}", i.ToString("X2"));
                Console.WriteLine(Command.ToString());
                WriteLogFile(Command.ToString());
                Port.WriteLine(Command.ToString());
                Thread.Sleep(ReadTimeOut);
                Command.Remove(0, Command.Length);
            }
        }

        private void Port_DataReceived(object sender, SerialDataReceivedEventArgs args)
        {
            string RawData = Port.ReadExisting();
            // Update some publicly accessible data structure to make this useful
            Console.WriteLine(RawData);
            WriteLogFile(RawData);
        }

        private void WriteLogFile(string message)
        {
            StreamWriter sw = new StreamWriter("log.txt", true);
            sw.WriteLine(message);
            sw.Close();
        }
    }
}

using System;
using TestObdScanner;

namespace ObdConsoleTest
{
    class Program
    {
        static void Main(string[] args)
        {
            ObdDevice dev = new ObdDevice("COM1", 9600);
            if (dev.Connect())
                dev.TestAllPids();
            
        }
    }
}