Merge pull request #2 from romanlum/master

Refactored command handling and added uwp implementation

OBD.NET/OBD.NET.Common/Communication/EventArgs/DataReceivedEventArgs.cs

@@ -0,0 +1,29 @@
+namespace OBD.NET.Common.Communication.EventArgs
+{
+    /// <summary>
+    /// Event args for receiving serial data
+    /// </summary>
+    public class DataReceivedEventArgs:System.EventArgs
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="DataReceivedEventArgs"/> class.
+        /// </summary>
+        /// <param name="count">The count.</param>
+        /// <param name="data">The data.</param>
+        public DataReceivedEventArgs(int count, byte[] data)
+        {
+            Count = count;
+            Data = data;
+        }
+
+        /// <summary>
+        /// Count of valid data bytes in the buffer
+        /// </summary>
+        public int Count { get; private set; }
+
+        /// <summary>
+        /// Data buffer holding the bytes
+        /// </summary>
+        public byte[] Data { get; private set; }
+    }
+}

OBD.NET/OBD.NET.Common/Communication/ISerialConnection.cs

@@ -0,0 +1,59 @@
+using OBD.NET.Common.Communication.EventArgs;
+using System;
+using System.Threading.Tasks;
+
+namespace OBD.NET.Communication
+{
+    /// <summary>
+    /// Serial connection interface
+    /// </summary>
+    /// <seealso cref="System.IDisposable" />
+    public interface ISerialConnection : IDisposable
+    {
+        /// <summary>
+        /// Gets a value indicating whether this instance is open.
+        /// </summary>
+        /// <value>
+        ///   <c>true</c> if this instance is open; otherwise, <c>false</c>.
+        /// </value>
+        bool IsOpen { get; }
+
+        /// <summary>
+        /// Gets a value indicating whether this instance uses asynchronous IO
+        /// </summary>
+        /// <remarks>
+        /// Has to be set to true if asynchronous IO is supported. 
+        /// If true async methods have to be implemented
+        /// </remarks>
+        bool IsAsync { get; }
+
+        /// <summary>
+        /// Occurs when a full line was received
+        /// </summary>
+        event EventHandler<DataReceivedEventArgs> DataReceived;
+
+        /// <summary>
+        /// Connects the serial port.
+        /// </summary>
+        void Connect();
+
+        /// <summary>
+        /// Connects the serial port asynchronous
+        /// </summary>
+        /// <returns></returns>
+        Task ConnectAsync();
+        
+        /// <summary>
+        /// Writes the specified data to the serial connection
+        /// </summary>
+        /// <param name="text">The text.</param>
+        void Write(byte[] data);
+
+        /// <summary>
+        /// Writes the specified data to the serial connection asynchronous
+        /// </summary>
+        /// <param name="text">The text.</param>
+        Task WriteAsync(byte[] data);
+
+    }
+}

OBD.NET/OBD.NET.Common/Devices/Command.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace OBD.NET.Common.Devices
+{
+    /// <summary>
+    /// Class used for queued command
+    /// </summary>
+    public class QueuedCommand
+    {
+
+        /// <summary>
+        /// Initializes a new instance
+        /// </summary>
+        /// <param name="commandText"></param>
+        public QueuedCommand(string commandText)
+        {
+            CommandResult = new CommandResult();
+            CommandText = commandText;
+        }
+
+        public string CommandText { get; set; }
+
+        public CommandResult CommandResult { get; }
+    }
+}

OBD.NET/OBD.NET.Common/Devices/CommandResult.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using OBD.NET.Util;
+
+namespace OBD.NET.Common.Devices
+{
+    public class CommandResult
+    {
+        public CommandResult()
+        {
+            WaitHandle = new AsyncManualResetEvent();
+        }
+
+        public object Result { get; set; }
+        public AsyncManualResetEvent WaitHandle  { get; }
+    }
+}

OBD.NET/OBD.NET.Common/Devices/ELM327.cs

@@ -9,6 +9,7 @@ using OBD.NET.Events.EventArgs;
 using OBD.NET.Extensions;
 using OBD.NET.Logging;
 using OBD.NET.OBDData;
+using System.Threading.Tasks;
 
 namespace OBD.NET.Devices
 {
@@ -22,7 +23,7 @@ namespace OBD.NET.Devices
         protected static Dictionary<byte, Type> DataTypeCache { get; } = new Dictionary<byte, Type>();
 
         protected Mode Mode { get; set; } = Mode.ShowCurrentData; //TODO DarthAffe 26.06.2016: Implement different modes
-
+        
         #endregion
 
         #region Events 
@@ -36,7 +37,7 @@ namespace OBD.NET.Devices
 
         #region Constructors
 
-        public ELM327(SerialConnection connection, IOBDLogger logger = null)
+        public ELM327(ISerialConnection connection, IOBDLogger logger = null)
             : base(connection, logger: logger)
         { }
 
@@ -44,17 +45,26 @@ namespace OBD.NET.Devices
 
         #region Methods
 
+        public override async Task InitializeAsync()
+        {
+            await base.InitializeAsync();
+            InternalInitialize();
+        }
+
         public override void Initialize()
         {
             base.Initialize();
+            InternalInitialize();
+        }
 
+        private void InternalInitialize()
+        {
             Logger?.WriteLine("Initializing ...", OBDLogLevel.Debug);
 
             try
             {
                 Logger?.WriteLine("Resetting Device ...", OBDLogLevel.Debug);
                 SendCommand(ATCommand.ResetDevice);
-                Thread.Sleep(1000);
 
                 Logger?.WriteLine("Turning Echo Off ...", OBDLogLevel.Debug);
                 SendCommand(ATCommand.EchoOff);
@@ -71,7 +81,6 @@ namespace OBD.NET.Devices
                 Logger?.WriteLine("Setting the Protocol to 'Auto' ...", OBDLogLevel.Debug);
                 SendCommand(ATCommand.SetProtocolAuto);
 
-                Thread.Sleep(1000);
             }
             // DarthAffe 21.02.2017: This seems to happen sometimes, i don't know why - just retry.
             catch
@@ -81,11 +90,20 @@ namespace OBD.NET.Devices
             }
         }
 
+
+        /// <summary>
+        /// Sends the AT command.
+        /// </summary>
+        /// <param name="command">The command.</param>
         public virtual void SendCommand(ATCommand command)
         {
             SendCommand(command.Command);
         }
 
+        /// <summary>
+        /// Requests the data and calls the handler
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
         public virtual void RequestData<T>()
             where T : class, IOBDData, new()
         {
@@ -101,13 +119,33 @@ namespace OBD.NET.Devices
             SendCommand(((byte)Mode).ToString("X2") + pid.ToString("X2"));
         }
 
-        protected override void ProcessMessage(string message)
+        /// <summary>
+        /// Requests the data asynchronous and return the data when available
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <returns></returns>
+        public virtual async Task<T> RequestDataAsync<T>()
+            where T : class, IOBDData, new()
+        {
+            Logger?.WriteLine("Requesting Type " + typeof(T).Name + " ...", OBDLogLevel.Debug);
+            byte pid = ResolvePid<T>();
+            Logger?.WriteLine("Requesting PID " + pid.ToString("X2") + " ...", OBDLogLevel.Debug);
+            var result = SendCommand(((byte)Mode).ToString("X2") + pid.ToString("X2"));
+
+            await result.WaitHandle.WaitAsync();
+            return result.Result as T;
+        }
+
+        
+
+        protected override object ProcessMessage(string message)
         {
             DateTime timestamp = DateTime.Now;
 
             RawDataReceived?.Invoke(this, new RawDataReceivedEventArgs(message, timestamp));
 
             if (message.Length > 4)
+            { 
                 if (message[0] == '4')
                 {
                     byte mode = (byte)message[1].GetHexVal();
@@ -119,13 +157,17 @@ namespace OBD.NET.Devices
                         {
                             IOBDData obdData = (IOBDData)Activator.CreateInstance(dataType);
                             obdData.Load(message.Substring(4, message.Length - 4));
-
+                            
                             IDataEventManager dataEventManager;
                             if (_dataReceivedEventHandlers.TryGetValue(dataType, out dataEventManager))
                                 dataEventManager.RaiseEvent(this, obdData, timestamp);
+
+                            return obdData;
                         }
                     }
                 }
+            }
+            return null;
         }
 
         protected virtual byte ResolvePid<T>()
@@ -155,12 +197,11 @@ namespace OBD.NET.Devices
                 if (sendCloseProtocol)
                 {
                     SendCommand(ATCommand.CloseProtocol);
-                    Thread.Sleep(500);
                 }
             }
             catch { }
 
-            _dataReceivedEventHandlers = null;
+            _dataReceivedEventHandlers.Clear();
 
             base.Dispose();
         }

OBD.NET/OBD.NET.Common/Devices/STN1170.cs

@@ -9,7 +9,7 @@ namespace OBD.NET.Devices
 
         #region Constructors
 
-        public STN1170(SerialConnection connection, IOBDLogger logger = null)
+        public STN1170(ISerialConnection connection, IOBDLogger logger = null)
             : base(connection, logger)
         { }
 

OBD.NET/OBD.NET.Common/Devices/SerialDevice.cs

@@ -0,0 +1,256 @@
+using System;
+using OBD.NET.Communication;
+using OBD.NET.Exceptions;
+using OBD.NET.Logging;
+using System.Threading.Tasks;
+using OBD.NET.Common.Communication.EventArgs;
+using System.Text;
+using System.Threading;
+using System.Collections.Concurrent;
+using OBD.NET.Common.Devices;
+
+namespace OBD.NET.Devices
+{ 
+    /// <summary>
+    /// Base class used for communicating with the device
+    /// </summary>
+    public abstract class SerialDevice : IDisposable
+    {
+        private BlockingCollection<QueuedCommand> commandQueue;
+
+        private readonly StringBuilder _lineBuffer = new StringBuilder();
+
+        private readonly AutoResetEvent commandFinishedEvent = new AutoResetEvent(false);
+
+        private Task commandWorkerTask;
+
+        private CancellationTokenSource commandCancellationToken;
+
+        protected QueuedCommand currentCommand;
+        
+        /// <summary>
+        /// Logger instance
+        /// </summary>
+        protected IOBDLogger Logger { get; }
+
+        /// <summary>
+        /// Low level connection
+        /// </summary>
+        protected ISerialConnection Connection { get; }
+
+        /// <summary>
+        /// Terminator of the protocol message
+        /// </summary>
+        protected char Terminator { get; set; }
+
+
+        #region Constructors
+
+        /// <summary>
+        /// Prevents a default instance of the <see cref="SerialDevice"/> class from being created.
+        /// </summary>
+        private SerialDevice()
+        {
+            commandQueue = new BlockingCollection<QueuedCommand>();
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SerialDevice"/> class.
+        /// </summary>
+        /// <param name="connection">connection.</param>
+        /// <param name="terminator">terminator used for terminating the command message</param>
+        /// <param name="logger">logger instance</param>
+        protected SerialDevice(ISerialConnection connection, char terminator = '\r', IOBDLogger logger = null)
+            :this()
+        {
+            Connection = connection;
+            Terminator = terminator;
+            Logger = logger;
+
+            connection.DataReceived += OnDataReceived;
+        }
+
+
+        #endregion
+        
+        #region Methods
+
+        
+        /// <summary>
+        /// Initializes the device
+        /// </summary>
+        public virtual void Initialize()
+        {
+            Connection.Connect();
+            CheckConnectionAndStartWorker();
+        }
+
+        /// <summary>
+        /// Initializes the device
+        /// </summary>
+        public virtual async Task InitializeAsync()
+        {
+            await Connection.ConnectAsync();
+            CheckConnectionAndStartWorker();
+        }
+
+        /// <summary>
+        /// Checks the connection and starts background worker which is sending the commands
+        /// </summary>
+        /// <exception cref="SerialException">Failed to open Serial-Connection.</exception>
+        private void CheckConnectionAndStartWorker()
+        {
+            if (!Connection.IsOpen)
+            {
+                Logger?.WriteLine("Failed to open Serial-Connection.", OBDLogLevel.Error);
+                throw new SerialException("Failed to open Serial-Connection.");
+            }
+            else
+            { 
+                Logger?.WriteLine("Opened Serial-Connection!", OBDLogLevel.Debug);
+            }
+
+            commandCancellationToken = new CancellationTokenSource();
+            commandWorkerTask = Task.Factory.StartNew(CommandWorker);
+        }
+
+
+        /// <summary>
+        /// Sends the command.
+        /// </summary>
+        /// <param name="command">command string</param>
+        /// <exception cref="System.InvalidOperationException">Not connected</exception>
+        protected virtual CommandResult SendCommand(string command)
+        {
+            if (!Connection.IsOpen)
+            {
+                throw new InvalidOperationException("Not connected");
+            }
+
+            
+            command = PrepareCommand(command);
+            Logger?.WriteLine("Queuing Command: '" + command.Replace('\r', '\'') + "'", OBDLogLevel.Verbose);
+
+            var cmd = new QueuedCommand(command);
+            commandQueue.Add(cmd);
+            return cmd.CommandResult;
+        }
+        
+        /// <summary>
+        /// Prepares the command
+        /// </summary>
+        /// <param name="command"></param>
+        /// <returns></returns>
+        protected virtual string PrepareCommand(string command)
+        {
+            if (command == null) throw new ArgumentNullException(nameof(command));
+
+            if (!command.EndsWith(Terminator.ToString(), StringComparison.Ordinal))
+                command += Terminator;
+
+            return command;
+        }
+
+        /// <summary>
+        /// Called when data is received from the serial device
+        /// </summary>
+        /// <param name="sender">The sender.</param>
+        /// <param name="e">The <see cref="DataReceivedEventArgs"/> instance containing the event data.</param>
+        private void OnDataReceived(object sender, DataReceivedEventArgs e)
+        {
+            for (int i = 0; i < e.Count; i++)
+            {
+                char c = (char)e.Data[i];
+                switch (c)
+                {
+                    case '\r':
+                        FinishLine();
+                        break;
+
+                    case '>':
+                        currentCommand.CommandResult.WaitHandle.Set();
+                        commandFinishedEvent.Set();
+                        break;
+
+                    case '\n':
+                    case (char)0x00:
+                        break; // ignore
+
+                    default:
+                        _lineBuffer.Append(c);
+                        break;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Signals a final message
+        /// </summary>
+        private void FinishLine()
+        {
+            string line = _lineBuffer.ToString().Trim();
+            _lineBuffer.Clear();
+
+            if (string.IsNullOrWhiteSpace(line)) return;
+            Logger?.WriteLine("Response: '" + line + "'", OBDLogLevel.Verbose);
+
+            InternalProcessMessage(line);
+        }
+
+        /// <summary>
+        /// Process message and sets the result 
+        /// </summary>
+        /// <param name="message">The message.</param>
+        private void InternalProcessMessage(string message)
+        {
+            var data = ProcessMessage(message);
+            currentCommand.CommandResult.Result = data;
+        }
+
+        /// <summary>
+        /// Processes the message.
+        /// </summary>
+        /// <param name="message">message received</param>
+        /// <returns>result data</returns>
+        protected abstract object ProcessMessage(string message);
+
+        /// <summary>
+        /// Worker method for sending commands
+        /// </summary>
+        private async void CommandWorker()
+        {
+            while (!commandCancellationToken.IsCancellationRequested)
+            {
+                currentCommand = null;
+                if(commandQueue.TryTake(out currentCommand, Timeout.Infinite, commandCancellationToken.Token))
+                {
+                    Logger?.WriteLine("Writing Command: '" + currentCommand.CommandText.Replace('\r', '\'') + "'", OBDLogLevel.Verbose);
+
+                    if (Connection.IsAsync)
+                    {
+                        await Connection.WriteAsync(Encoding.ASCII.GetBytes(currentCommand.CommandText));
+                    }
+                    else
+                    {
+                        Connection.Write(Encoding.ASCII.GetBytes(currentCommand.CommandText));
+
+                    }
+                    //wait for command to finish
+                    commandFinishedEvent.WaitOne();   
+                }
+            }
+        }
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        public virtual void Dispose()
+        {
+            commandCancellationToken?.Cancel();
+            commandWorkerTask?.Wait();
+            Connection?.Dispose();
+        }
+
+        #endregion
+    }
+}

OBD.NET/OBD.NET.Common/Exceptions/SerialException.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Runtime.Serialization;
 
 namespace OBD.NET.Exceptions
 {
@@ -17,10 +16,7 @@ namespace OBD.NET.Exceptions
         public SerialException(string message, Exception innerException)
             : base(message, innerException)
         { }
-
+        
-        protected SerialException(SerializationInfo info, StreamingContext context)
-            : base(info, context)
-        { }
 
         #endregion
     }

OBD.NET/OBD.NET.Common/Exceptions/UnexpectedResultException.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Runtime.Serialization;
 
 namespace OBD.NET.Exceptions
 {
@@ -34,13 +33,7 @@ namespace OBD.NET.Exceptions
             this.Result = result;
             this.ExpectedResult = expectedResult;
         }
-
+        
-        protected UnexpectedResultException(SerializationInfo info, StreamingContext context, string result, string expectedResult)
-            : base(info, context)
-        {
-            this.Result = result;
-            this.ExpectedResult = expectedResult;
-        }
 
         #endregion
     }

OBD.NET/OBD.NET.Common/Logging/OBDDebugLogger.cs

@@ -0,0 +1,17 @@
+using OBD.NET.Logging;
+using System.Diagnostics;
+
+namespace OBD.NET.Common.Logging
+{
+    /// <summary>
+    /// Simple debug logger
+    /// </summary>
+    /// <seealso cref="OBD.NET.Logging.IOBDLogger" />
+    public class OBDDebugLogger : IOBDLogger
+    {
+        public void WriteLine(string text, OBDLogLevel level)
+        {
+            Debug.WriteLine($"{level}: {text}");
+        }
+    }
+}

OBD.NET/OBD.NET.Common/OBD.NET.Common.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard1.4</TargetFramework>
+    <Authors>Wyrez / Roman Lumetsberger</Authors>
+    <Company>-</Company>
+    <Product>OBD.NET</Product>
+    <Description>C#-Library to read/write data from/to a car through an ELM327-/STN1170-Adapter</Description>
+    <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
+    <Version>1.1.0</Version>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Properties\" />
+  </ItemGroup>
+
+</Project>