From c41b0cef16eb289ecefc330b01d3a3e156bf7c0f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Felix=20Wei=C3=9F?=
 <72068105+Sandoun@users.noreply.github.com>
Date: Mon, 7 Aug 2023 18:05:02 +0200
Subject: [PATCH] Fix queue and dc issues

---
 Examples.BasicEthernet/Program.cs             |   1 -
 Examples.WPF/MainWindow.xaml                  |  11 +-
 Examples.WPF/Views/ConnectView.xaml.cs        |  36 ++-
 Examples.WPF/Views/PlcDataView.xaml           |   4 +
 Examples.WPF/Views/PlcDataView.xaml.cs        |  19 ++
 MewtocolNet/Helpers/MewtocolHelpers.cs        |   1 +
 MewtocolNet/Helpers/PlcBitConverter.cs        |  28 ++
 MewtocolNet/IPlc.cs                           |  19 +-
 MewtocolNet/Mewtocol.cs                       |  61 +++-
 MewtocolNet/MewtocolInterface.cs              | 278 ++++++++++--------
 .../MewtocolInterfaceRegisterHandling.cs      |  44 ++-
 MewtocolNet/MewtocolInterfaceRequests.cs      | 118 ++++++--
 MewtocolNet/MewtocolInterfaceSerial.cs        |   4 +-
 MewtocolNet/MewtocolInterfaceTcp.cs           |  57 ++--
 MewtocolNet/PLCInfo.cs                        |  12 +
 MewtocolNet/PlcMetadata.cs                    |  56 ++++
 MewtocolNet/Registers/Base/Register.cs        |   2 +
 .../Registers/Classes/StringRegister.cs       |   4 +-
 MewtocolNet/SetupClasses/InterfaceSettings.cs |  10 +
 MewtocolNet/UnderlyingRegisters/DTArea.cs     |   8 +-
 .../UnderlyingRegisters/MemoryAreaManager.cs  |   4 +-
 21 files changed, 564 insertions(+), 213 deletions(-)
 create mode 100644 MewtocolNet/Helpers/PlcBitConverter.cs
 create mode 100644 MewtocolNet/PlcMetadata.cs

diff --git a/Examples.BasicEthernet/Program.cs b/Examples.BasicEthernet/Program.cs
index 7ec537c..810981b 100644
--- a/Examples.BasicEthernet/Program.cs
+++ b/Examples.BasicEthernet/Program.cs
@@ -26,7 +26,6 @@ internal class Program {
 
             //connect async to the plc
             await plc.ConnectAsync();
-            await plc.SendCommandAsync($"%EE#RP0000000004");
 
             //check if the connection was established
             if (!plc.IsConnected) {
diff --git a/Examples.WPF/MainWindow.xaml b/Examples.WPF/MainWindow.xaml
index 895407b..57867ca 100644
--- a/Examples.WPF/MainWindow.xaml
+++ b/Examples.WPF/MainWindow.xaml
@@ -8,7 +8,7 @@
         mc:Ignorable="d"
         MinWidth="500"
         MinHeight="400"
-        Height="600"
+        Height="850"
         Width="800"
         Title="MewtocolNet WPF Demo">
     <Grid>
@@ -100,7 +100,14 @@
 
                     <TextBlock Text="{Binding AppViewModel.Plc.BytesPerSecondUpstream, Mode=OneWay}"
                                VerticalAlignment="Center"/>
-                    
+
+                    <Border Width="1"
+                            Margin="5"
+                            Background="Gray"/>
+
+                    <TextBlock Text="{Binding AppViewModel.Plc.QueuedMessages, StringFormat='{}Q: {0}', Mode=OneWay}"
+                               VerticalAlignment="Center"/>
+
                     <StackPanel.Style>
                         <Style TargetType="StackPanel">
                             <Style.Triggers>
diff --git a/Examples.WPF/Views/ConnectView.xaml.cs b/Examples.WPF/Views/ConnectView.xaml.cs
index 637c8e4..6cc631a 100644
--- a/Examples.WPF/Views/ConnectView.xaml.cs
+++ b/Examples.WPF/Views/ConnectView.xaml.cs
@@ -1,6 +1,7 @@
 using Examples.WPF.ViewModels;
 using MewtocolNet;
 using MewtocolNet.ComCassette;
+using MewtocolNet.Registers;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -53,24 +54,28 @@ public partial class ConnectView : UserControl {
 
             var parsedInt = int.Parse(viewModel.SelectedPort);
 
+            IRegister<short> heartbeatSetter = null!;
+
             App.ViewModel.Plc = Mewtocol.Ethernet(viewModel.SelectedIP, parsedInt)
             .WithPoller()
-            .WithInterfaceSettings(s => {
-                s.TryReconnectAttempts = 30;
-                s.TryReconnectDelayMs = 2000;
+            .WithInterfaceSettings(setting => {
+                setting.TryReconnectAttempts = 30;
+                setting.TryReconnectDelayMs = 2000;
+                setting.HeartbeatIntervalMs = 3000;
             })
-            .WithCustomPollLevels(l => {
-                l.SetLevel(2, 3);
-                l.SetLevel(3, TimeSpan.FromSeconds(5));
-                l.SetLevel(4, TimeSpan.FromSeconds(10));
+            .WithCustomPollLevels(lvl => {
+                lvl.SetLevel(2, 3);
+                lvl.SetLevel(3, TimeSpan.FromSeconds(5));
+                lvl.SetLevel(4, TimeSpan.FromSeconds(10));
             })
             .WithRegisters(b => {
-               
+
                 //b.Struct<short>("DT0").Build();
                 //b.Struct<short>("DT0").AsArray(30).Build();
 
-                b.Struct<short>("DT1000").Build();
-                //b.Struct<Word>("DT1000").Build();
+                b.Struct<short>("DT1000").Build(out heartbeatSetter);
+                b.Struct<Word>("DT1000").Build();
+
                 b.Struct<ushort>("DT1001").PollLevel(2).Build();
                 b.Struct<Word>("DT1002").PollLevel(2).Build();
 
@@ -83,6 +88,11 @@ public partial class ConnectView : UserControl {
                 b.String("DT1024", 32).PollLevel(3).Build();
                 b.String("DT1042", 5).PollLevel(4).Build();
 
+            })
+            .WithHeartbeatTask(async () => {
+
+                await heartbeatSetter.WriteAsync((short)new Random().Next(short.MinValue, short.MaxValue));
+
             })
             .Build();
 
@@ -92,12 +102,6 @@ public partial class ConnectView : UserControl {
 
                 App.MainWindow.mainContent.Content = new PlcDataView();
 
-                //for (int i = 0; i < 300000; i++) {
-
-                //    _ = Task.Run(async () => await App.ViewModel.Plc.SendCommandAsync("%EE#RT"));
-
-                //}
-
             }
 
             viewModel.IsConnecting = false;
diff --git a/Examples.WPF/Views/PlcDataView.xaml b/Examples.WPF/Views/PlcDataView.xaml
index 5dee500..c82fa9a 100644
--- a/Examples.WPF/Views/PlcDataView.xaml
+++ b/Examples.WPF/Views/PlcDataView.xaml
@@ -23,6 +23,10 @@
                           Click="ClickedDisconnect"/>
                 <MenuItem Header="Connect" IsEnabled="{Binding Plc.IsConnected, Converter={StaticResource bInv}}"
                           Click="ClickedConnect"/>
+                <MenuItem Header="Set Random DT1000" IsEnabled="{Binding Plc.IsConnected}"
+                          Click="ClickedSetRandom"/>
+                <MenuItem Header="Toggle OP mode" IsEnabled="{Binding Plc.IsConnected}"
+                          Click="ClickedToggleRunMode"/>
             </MenuItem>
         </Menu>
         
diff --git a/Examples.WPF/Views/PlcDataView.xaml.cs b/Examples.WPF/Views/PlcDataView.xaml.cs
index 11e23f2..d38b2c9 100644
--- a/Examples.WPF/Views/PlcDataView.xaml.cs
+++ b/Examples.WPF/Views/PlcDataView.xaml.cs
@@ -1,4 +1,5 @@
 using Examples.WPF.ViewModels;
+using MewtocolNet.Registers;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -41,4 +42,22 @@ public partial class PlcDataView : UserControl {
 
     }
 
+    private async void ClickedSetRandom(object sender, RoutedEventArgs e) {
+
+        var reg = (IRegister<ushort>?)viewModel.Plc.GetAllRegisters()?.FirstOrDefault(x => x.PLCAddressName == "DT1001");
+
+        if(reg != null) {
+
+            await reg.WriteAsync((ushort)new Random().Next(ushort.MinValue, ushort.MaxValue));
+
+        }
+
+    }
+
+    private async void ClickedToggleRunMode(object sender, RoutedEventArgs e) {
+
+        await viewModel.Plc.ToggleOperationModeAsync();
+
+    }
+
 }
diff --git a/MewtocolNet/Helpers/MewtocolHelpers.cs b/MewtocolNet/Helpers/MewtocolHelpers.cs
index ce8fabc..c63bc36 100644
--- a/MewtocolNet/Helpers/MewtocolHelpers.cs
+++ b/MewtocolNet/Helpers/MewtocolHelpers.cs
@@ -3,6 +3,7 @@ using MewtocolNet.Registers;
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Globalization;
 using System.Linq;
 using System.Reflection;
diff --git a/MewtocolNet/Helpers/PlcBitConverter.cs b/MewtocolNet/Helpers/PlcBitConverter.cs
new file mode 100644
index 0000000..fb01ae3
--- /dev/null
+++ b/MewtocolNet/Helpers/PlcBitConverter.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace MewtocolNet.Helpers {
+
+    internal static class PlcBitConverter {
+
+        internal static string ToVersionNumber(IEnumerable<byte> inBytes, int startIndex = 0) {
+
+            return string.Join(".", inBytes.Skip(startIndex).Take(4).Reverse().Select(x => x.ToString()));
+
+        }
+
+        internal static DateTime ToDateTime(IEnumerable<byte> inBytes, int startIndex = 0) {
+
+            var offDate = new DateTime(2001, 01, 01);
+
+            var secondsOff = BitConverter.ToUInt32(inBytes.ToArray(), startIndex);
+
+            return offDate + TimeSpan.FromSeconds(secondsOff);
+
+        }
+
+    }
+
+}
diff --git a/MewtocolNet/IPlc.cs b/MewtocolNet/IPlc.cs
index c258061..590bc9d 100644
--- a/MewtocolNet/IPlc.cs
+++ b/MewtocolNet/IPlc.cs
@@ -94,24 +94,21 @@ namespace MewtocolNet {
         /// </summary>
         /// <param name="_msg">MEWTOCOL Formatted request string ex: %01#RT</param>
         /// <returns>Returns the result</returns>
-        Task<MewtocolFrameResponse> SendCommandAsync(string _msg, Action<double> onReceiveProgress = null);
-
-        /// <summary>
-        /// Sends a command to the PLC and awaits its arrival<br/>
-        /// The checksum and BCC are appended automatically.<br/>
-        /// <b>Warning!</b> this command is only sent one directional, no error checking or other features included
-        /// </summary>
-        /// <param name="_msg">MEWTOCOL Formatted request string ex: %01#RT</param>
-        /// <returns>Returns true if the message was received</returns>
-        Task<bool> SendNoResponseCommandAsync(string _msg);
+        //Task<MewtocolFrameResponse> SendCommandAsync(string _msg, Action<double> onReceiveProgress = null);
 
         /// <summary>
         /// Changes the PLCs operation mode to the given one
         /// </summary>
-        /// <param name="setRun">True for run mode, false for prog mode</param>
+        /// <param name="setRun">True for RUN mode, false for PROG mode</param>
         /// <returns>The success state of the write operation</returns>
         Task<bool> SetOperationModeAsync(bool setRun);
 
+        /// <summary>
+        /// Toggles between RUN and PROG mode
+        /// </summary>
+        /// <returns>The success state of the write operation</returns>
+        Task<bool> ToggleOperationModeAsync();
+
         /// <summary>
         /// Restarts the plc program
         /// </summary>
diff --git a/MewtocolNet/Mewtocol.cs b/MewtocolNet/Mewtocol.cs
index 0932910..e7ffe2a 100644
--- a/MewtocolNet/Mewtocol.cs
+++ b/MewtocolNet/Mewtocol.cs
@@ -321,10 +321,12 @@ namespace MewtocolNet
                     imew.memoryManager.pollLevelOrMode = res.PollLevelOverwriteMode;
 
                     imew.maxDataBlocksPerWrite = res.MaxDataBlocksPerWrite;
-                    imew.sendReceiveTimeoutMs = res.SendReceiveTimeoutMs;
+                    imew.heartbeatIntervalMs = res.HeartbeatIntervalMs;
                     imew.tryReconnectAttempts = res.TryReconnectAttempts;
                     imew.tryReconnectDelayMs = res.TryReconnectDelayMs;
 
+                    imew.alwaysGetMetadata = res.AlwaysGetMetadata;
+
                 }
 
                 return this;
@@ -352,7 +354,7 @@ namespace MewtocolNet
             /// <summary>
             /// A builder for attaching register collections
             /// </summary>
-            public EndInit<T> WithRegisterCollections(Action<RegCollector> collector) {
+            public PostRegisterSetup<T> WithRegisterCollections(Action<RegCollector> collector) {
 
                 try {
 
@@ -363,7 +365,7 @@ namespace MewtocolNet
                         imew.WithRegisterCollections(res.collections);
                     }
 
-                    return new EndInit<T> {
+                    return new PostRegisterSetup<T> {
                         postInit = this
                     };
 
@@ -378,7 +380,7 @@ namespace MewtocolNet
             /// <summary>
             /// A builder for attaching register collections
             /// </summary>
-            public PostInit<T> WithRegisters(Action<RBuild> builder) {
+            public PostRegisterSetup<T> WithRegisters(Action<RBuild> builder) {
 
                 try {
 
@@ -389,7 +391,9 @@ namespace MewtocolNet
 
                     plc.AddRegisters(regBuilder.assembler.assembled.ToArray());
 
-                    return this;
+                    return new PostRegisterSetup<T> {
+                        postInit = this,
+                    };
 
                 } catch {
 
@@ -408,12 +412,53 @@ namespace MewtocolNet
 
         #endregion
 
-        #region Interface building step 3
-
-        public class EndInit<T> {
+        public class PostRegisterSetup<T> {
 
             internal PostInit<T> postInit;
 
+            /// <summary>
+            /// Repeats the passed method each time the hearbeat is triggered,
+            /// use 
+            /// </summary>
+            /// <param name="heartBeatAsync"></param>
+            /// <returns></returns>
+            public EndInitSetup<T> WithHeartbeatTask(Func<Task> heartBeatAsync, bool executeInProg = false) {
+
+                try {
+
+                    var plc = (MewtocolInterface)(object)postInit.intf;
+
+                    plc.heartbeatCallbackTask = heartBeatAsync;
+                    plc.execHeartBeatCallbackTaskInProg = executeInProg;
+
+                    return new EndInitSetup<T> {
+                        postInit = this.postInit,
+                        postRegSetupInit = this
+                    };
+
+                } catch {
+
+                    throw;
+
+                }
+
+            }
+
+            /// <summary>
+            /// Builds and returns the final plc interface
+            /// </summary>
+            public T Build() => postInit.intf;
+
+        }
+
+        #region Interface building step 4
+
+        public class EndInitSetup<T> {
+
+            internal PostInit<T> postInit;
+
+            internal PostRegisterSetup<T> postRegSetupInit;
+
             /// <summary>
             /// Builds and returns the final plc interface
             /// </summary>
diff --git a/MewtocolNet/MewtocolInterface.cs b/MewtocolNet/MewtocolInterface.cs
index a24e345..d534b37 100644
--- a/MewtocolNet/MewtocolInterface.cs
+++ b/MewtocolNet/MewtocolInterface.cs
@@ -10,6 +10,7 @@ using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Net.Sockets;
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Text;
 using System.Text.RegularExpressions;
@@ -25,6 +26,9 @@ namespace MewtocolNet {
         /// <inheritdoc/>
         public event PlcConnectionEventHandler Connected;
 
+        /// <inheritdoc/>
+        public event PlcConnectionEventHandler Reconnected;
+
         /// <inheritdoc/>
         public event PlcConnectionEventHandler Disconnected;
 
@@ -45,7 +49,6 @@ namespace MewtocolNet {
 
         private int tcpMessagesSentThisCycle = 0;
         private int pollerCycleDurationMs;
-        private volatile int queuedMessages;
         private bool isConnected;
         private PLCInfo plcInfo;
         private protected int stationNumber;
@@ -57,12 +60,14 @@ namespace MewtocolNet {
         private protected int bytesPerSecondUpstream = 0;
         private protected int bytesPerSecondDownstream = 0;
 
-        private protected AsyncQueue queue = new AsyncQueue();
-
         private protected Stopwatch speedStopwatchUpstr;
         private protected Stopwatch speedStopwatchDownstr;
-        private protected Task firstPollTask;
-        private Task reconnectTask;
+
+        protected Task firstPollTask;
+        protected Task reconnectTask;
+        protected Task<MewtocolFrameResponse> regularSendTask;
+        protected Queue<Task<MewtocolFrameResponse>> userInputSendTasks = new Queue<Task<MewtocolFrameResponse>>();
+
 
         private protected bool wasInitialStatusReceived;
         private protected MewtocolVersion mewtocolVersion;
@@ -77,17 +82,22 @@ namespace MewtocolNet {
         internal event Action PolledCycle;
         internal volatile bool pollerTaskStopped = true;
         internal volatile bool pollerFirstCycle;
-        internal bool usePoller = false;
         internal MemoryAreaManager memoryManager;
 
-        private volatile bool isMessageLocked;
+        //configuration
+
+        private protected bool isMessageLocked;
         private volatile bool isReceiving;
         private volatile bool isSending;
 
         internal int sendReceiveTimeoutMs = 1000;
+        internal int heartbeatIntervalMs = 3000;
         internal int tryReconnectAttempts = 0;
         internal int tryReconnectDelayMs = 1000;
 
+        internal bool usePoller = false;
+        internal bool alwaysGetMetadata = true;
+
         #endregion
 
         #region Public Read Only Properties / Fields
@@ -96,7 +106,7 @@ namespace MewtocolNet {
         public bool Disposed { get; private set; }
 
         /// <inheritdoc/>
-        public int QueuedMessages => queuedMessages;
+        public int QueuedMessages => userInputSendTasks.Count;
 
         /// <inheritdoc/>
         public bool IsConnected {
@@ -244,6 +254,20 @@ namespace MewtocolNet {
             Logger.Log($"DIAG ERR: {PlcInfo.SelfDiagnosticError}", LogLevel.Verbose, this);
             Logger.Log($"CPU VER: {PlcInfo.CpuVersion}", LogLevel.Verbose, this);
 
+            if(alwaysGetMetadata) {
+
+                Logger.LogVerbose($"METADATA: {PlcInfo.Metadata.MetaDataVersion}", this);
+                Logger.LogVerbose($"FP-WIN VERSION: {PlcInfo.Metadata.FPWinVersion}", this);
+                Logger.LogVerbose($"Project VERSION: {PlcInfo.Metadata.ProjectVersion}", this);
+                Logger.LogVerbose($"Company ID: {PlcInfo.Metadata.CompanyID}", this);
+                Logger.LogVerbose($"Application ID: {PlcInfo.Metadata.ApplicationID}", this);
+                Logger.LogVerbose($"Project ID: {PlcInfo.Metadata.ProjectID}", this);
+                Logger.LogVerbose($"LAST CONF CHNG: {PlcInfo.Metadata.LastConfigChangeDate}", this);
+                Logger.LogVerbose($"LAST POU CHNG: {PlcInfo.Metadata.LastPouChangeDate}", this);
+                Logger.LogVerbose($"LAST USR-LIB CHNG: {PlcInfo.Metadata.LastUserLibChangeDate}", this);
+
+            }
+
             Logger.Log($">> Intial connection end <<", LogLevel.Verbose, this);
 
             if (callBack != null) {
@@ -348,131 +372,120 @@ namespace MewtocolNet {
 
         }
 
-        internal async Task AwaitReconnectTaskAsync () {
+        //internally used send task
+        internal async Task<MewtocolFrameResponse> SendCommandInternalAsync(string _msg, Action<double> onReceiveProgress = null) {
 
-            if (reconnectTask != null && !reconnectTask.IsCompleted) await reconnectTask;
+            if (regularSendTask != null && !regularSendTask.IsCompleted) {
 
-            await Task.CompletedTask;
+                //queue self
 
-        }
+                var t = new Task<MewtocolFrameResponse>(() => SendCommandInternalAsync(_msg, onReceiveProgress).Result);
+                userInputSendTasks.Enqueue(t);
 
-        private Task<MewtocolFrameResponse> regularSendTask;
+                OnPropChange(nameof(QueuedMessages));
 
-        /// <inheritdoc/>
-        public async Task<MewtocolFrameResponse> SendCommandAsync(string _msg, Action<double> onReceiveProgress = null) {
+                await t;
 
-            if (isMessageLocked)
-                throw new NotSupportedException("Can't send multiple messages in parallel");
+                OnPropChange(nameof(QueuedMessages));
 
-            isMessageLocked = true;
-
-            await AwaitReconnectTaskAsync();
-
-            if (!IsConnected && !isConnectingStage)
-                throw new NotSupportedException("The device must be connected to send a message");
-
-            //send request
-            queuedMessages++;
-
-            //wait for the last send task to complete
-            if (regularSendTask != null && !regularSendTask.IsCompleted) await regularSendTask;
-
-            regularSendTask = SendFrameAsync(_msg, onReceiveProgress, false);
-
-            if (await Task.WhenAny(regularSendTask, Task.Delay(2000)) != regularSendTask) {
-
-                isMessageLocked = false;
-
-                // timeout logic
-                return MewtocolFrameResponse.Timeout;
+                return t.Result;
 
             }
 
-            //canceled
-            if (regularSendTask.IsCanceled) {
+            if (tSource.Token.IsCancellationRequested) return MewtocolFrameResponse.Canceled;
+
+            if (!IsConnected && !isConnectingStage && !isReconnectingStage)
+                throw new NotSupportedException("The device must be connected to send a message");
+
+            isMessageLocked = true;
+
+            //wait for the last send task to complete
+            //if (regularSendTask != null && !regularSendTask.IsCompleted) await regularSendTask;
+
+            //send request
+            regularSendTask = SendTwoDirectionalFrameAsync(_msg, onReceiveProgress);
+
+            //if (regularSendTask == null) return MewtocolFrameResponse.Canceled;
+
+            try {
+
+                var timeoutAwaiter = await Task.WhenAny(regularSendTask, Task.Delay(2000, tSource.Token));
+
+                if (timeoutAwaiter != regularSendTask) {
+
+                    isMessageLocked = false;
+                    regularSendTask = null;
+
+                    // timeout logic
+                    return MewtocolFrameResponse.Timeout;
+
+                }
+
+            } catch (OperationCanceledException) {
 
-                isMessageLocked = false;
                 return MewtocolFrameResponse.Canceled;
 
-            } 
-
-            tcpMessagesSentThisCycle++;
-            queuedMessages--;
-
-            //success
-            if (regularSendTask.Result.Success) {
-
-                isMessageLocked = false;
-                return regularSendTask.Result;
-
-            }
-
-            //no success
-            if(reconnectTask == null) StartReconnectTask();
-
-            //await the single reconnect task
-            await AwaitReconnectTaskAsync();
-
-            //re-send the command
-            if (IsConnected) {
-
-                isMessageLocked = false;
-                return await SendCommandAsync(_msg, onReceiveProgress);
-
-            }
-
-            isMessageLocked = false;
-            return regularSendTask.Result;
-
-        }
-
-        /// <inheritdoc/>
-        public async Task<bool> SendNoResponseCommandAsync(string _msg) {
-
-            if (isMessageLocked)
-                throw new NotSupportedException("Can't send multiple messages in parallel");
-
-            isMessageLocked = true;
-
-            await AwaitReconnectTaskAsync();
-
-            if (!IsConnected && !isConnectingStage)
-                throw new NotSupportedException("The device must be connected to send a message");
-
-            //send request
-            queuedMessages++;
-
-            //wait for the last send task to complete
-            if (regularSendTask != null && !regularSendTask.IsCompleted) await regularSendTask;
-
-            regularSendTask = SendFrameAsync(_msg, null, true);
-
-            if (await Task.WhenAny(regularSendTask, Task.Delay(2000)) != regularSendTask) {
-
-                isMessageLocked = false;
-
-                // timeout logic
-                return false;
-
             }
 
             //canceled
             if (regularSendTask.IsCanceled) {
 
                 isMessageLocked = false;
-                return false;
+                regularSendTask = null;
+
+                return MewtocolFrameResponse.Canceled;
 
             }
 
+            MewtocolFrameResponse responseData = regularSendTask.Result;
+
             tcpMessagesSentThisCycle++;
-            queuedMessages--;
 
             isMessageLocked = false;
-            return true;
+            regularSendTask = null;
+
+            return responseData;
 
         }
 
-        private protected async Task<MewtocolFrameResponse> SendFrameAsync(string frame, Action<double> onReceiveProgress, bool noResponse) {
+        private protected async Task<MewtocolFrameResponse> SendOneDirectionalFrameAsync (string frame) {
+
+            try {
+
+                if (stream == null) return MewtocolFrameResponse.NotIntialized;
+
+                frame = $"{frame.BCC_Mew()}\r";
+
+                SetUpstreamStopWatchStart();
+
+                IsSending = true;
+
+                if (tSource.Token.IsCancellationRequested) return MewtocolFrameResponse.Canceled;
+
+                //write inital command
+                byte[] writeBuffer = Encoding.UTF8.GetBytes(frame);
+                await stream.WriteAsync(writeBuffer, 0, writeBuffer.Length, tSource.Token);
+
+                IsSending = false;
+
+                //calc upstream speed
+                CalcUpstreamSpeed(writeBuffer.Length);
+
+                OnOutMsg(frame);
+                OnEndMsg();
+
+            } catch (Exception ex) {
+
+                IsSending = false;
+                return new MewtocolFrameResponse(400, ex.Message.ToString());
+
+            }
+
+            return MewtocolFrameResponse.EmptySuccess;
+
+        }
+
+        private protected async Task<MewtocolFrameResponse> SendTwoDirectionalFrameAsync(string frame, Action<double> onReceiveProgress = null) {
 
             try {
 
@@ -511,13 +524,6 @@ namespace MewtocolNet {
 
                 OnOutMsg(frame);
 
-                if(noResponse) {
-
-                    Logger.Log($"[---------CMD END----------]", LogLevel.Critical, this);
-                    return MewtocolFrameResponse.EmptySuccess;
-
-                }
-
                 var readResult = await ReadCommandAsync(wordsCountRequested, onReceiveProgress);
 
                 //did not receive bytes but no errors, the com port was not configured right
@@ -724,6 +730,12 @@ namespace MewtocolNet {
             var formatted = $"R <- : {inMsg.Replace("\r", "(CR)")}";
             AddToLastMsgs(formatted);
             Logger.Log(formatted, LogLevel.Critical, this);
+            OnEndMsg();
+
+        }
+
+        private protected void OnEndMsg () {
+
             Logger.Log($"[---------CMD END----------]", LogLevel.Critical, this);
 
         }
@@ -742,6 +754,7 @@ namespace MewtocolNet {
             if (IsConnected) {
 
                 tSource.Cancel();
+                isMessageLocked = false;
 
                 Logger.Log("The PLC connection timed out", LogLevel.Error, this);
                 OnDisconnect();
@@ -755,6 +768,7 @@ namespace MewtocolNet {
             if (IsConnected) {
 
                 tSource.Cancel();
+                isMessageLocked = false;
 
                 Logger.Log("The PLC connection was closed", LogLevel.Error, this);
                 OnDisconnect();
@@ -774,9 +788,11 @@ namespace MewtocolNet {
         private protected void OnSocketExceptionWhileConnected () {
 
             tSource.Cancel();
-
+            isMessageLocked = false;
             IsConnected = false;
 
+            if (reconnectTask == null) StartReconnectTask();
+
         }
 
         private protected virtual void OnConnected(PLCInfo plcinf) {
@@ -809,10 +825,30 @@ namespace MewtocolNet {
 
         }
 
-        private void OnGenericUpdateTimerTick(object sender, System.Timers.ElapsedEventArgs e) {
+        private protected void OnReconnected () {
 
-            GetAllRegisters().Cast<Register>()
-            .ToList().ForEach(x => x.OnInterfaceCyclicTimerUpdate((int)cyclicGenericUpdateCounter.Interval));
+            IsReceiving = false;
+            IsSending = false;
+            BytesPerSecondDownstream = 0;
+            BytesPerSecondUpstream = 0;
+            PollerCycleDurationMs = 0;
+
+            isMessageLocked = false;
+
+            ClearRegisterVals();
+            KillPoller();
+
+            //GetAllRegisters().Cast<Register>().ToList().ForEach(x => x.OnPlcDisconnected());
+
+            //generate a new cancellation token source
+            tSource = new CancellationTokenSource();
+
+            IsConnected = true;
+            isReconnectingStage = false;
+            isConnectingStage = false;
+            reconnectTask = null;
+
+            Reconnected?.Invoke(this, new PlcConnectionArgs());
 
         }
 
@@ -823,8 +859,9 @@ namespace MewtocolNet {
             BytesPerSecondDownstream = 0;
             BytesPerSecondUpstream = 0;
             PollerCycleDurationMs = 0;
-            PlcInfo = null; 
+            PlcInfo = null;
 
+            isMessageLocked = false;
             IsConnected = false;
             ClearRegisterVals();
 
@@ -845,6 +882,13 @@ namespace MewtocolNet {
 
         }
 
+        private void OnGenericUpdateTimerTick(object sender, System.Timers.ElapsedEventArgs e) {
+
+            GetAllRegisters().Cast<Register>()
+            .ToList().ForEach(x => x.OnInterfaceCyclicTimerUpdate((int)cyclicGenericUpdateCounter.Interval));
+
+        }
+
         private void SetUpstreamStopWatchStart() {
 
             if (speedStopwatchUpstr == null) {
diff --git a/MewtocolNet/MewtocolInterfaceRegisterHandling.cs b/MewtocolNet/MewtocolInterfaceRegisterHandling.cs
index 42bd923..1cd0e57 100644
--- a/MewtocolNet/MewtocolInterfaceRegisterHandling.cs
+++ b/MewtocolNet/MewtocolInterfaceRegisterHandling.cs
@@ -19,6 +19,9 @@ namespace MewtocolNet {
 
         internal Task heartbeatTask = Task.CompletedTask;
 
+        internal Func<Task> heartbeatCallbackTask;
+        internal bool execHeartBeatCallbackTaskInProg = false;
+
         internal Task pollCycleTask;
 
         private List<RegisterCollection> registerCollections = new List<RegisterCollection>();
@@ -43,6 +46,8 @@ namespace MewtocolNet {
 
         private System.Timers.Timer heartBeatTimer;
 
+        internal volatile bool pollerFirstCycleCompleted;
+
         #region Register Polling
 
         internal void WatchPollerDemand() {
@@ -50,6 +55,7 @@ namespace MewtocolNet {
             memoryManager.MemoryLayoutChanged += () => TestPollerStartNeeded();
 
             Connected += (s, e) => TestPollerStartNeeded();
+            Reconnected += (s, e) => TestPollerStartNeeded();
 
             Disconnected += (s, e) => {
 
@@ -93,6 +99,7 @@ namespace MewtocolNet {
         /// </summary>
         internal void KillPoller() {
 
+            pollerFirstCycleCompleted = false;
             pollerTaskStopped = true;
 
         }
@@ -104,6 +111,7 @@ namespace MewtocolNet {
 
             if (!pollerTaskStopped) return;
 
+            pollerFirstCycleCompleted = false;
             PollerCycleDurationMs = 0;
             pollerFirstCycle = true;
 
@@ -113,7 +121,9 @@ namespace MewtocolNet {
 
         private void PollTimerTick(object sender, System.Timers.ElapsedEventArgs e) {
 
-            if(!IsConnected || isConnectingStage) return;
+            if(!IsConnected || isConnectingStage || isReconnectingStage) return;
+
+            heartBeatTimer.Stop();
 
             heartbeatNeedsRun = true;
 
@@ -127,15 +137,24 @@ namespace MewtocolNet {
 
             Logger.LogVerbose("Sending heartbeat", this);
 
-            if (await GetPLCInfoAsync(2000) == null) {
+            if (await GetInfoAsync() == null) {
 
                 Logger.LogError("Heartbeat timed out", this);
 
-                OnSocketExceptionWhileConnected();
-                StartReconnectTask();
+                //OnSocketExceptionWhileConnected();
+                //StartReconnectTask();
+
+                return;
 
             }
 
+            if(heartbeatCallbackTask != null && (plcInfo.IsRunMode || execHeartBeatCallbackTaskInProg)) 
+                await heartbeatCallbackTask();
+
+            Logger.LogVerbose("End heartbeat", this);
+
+            heartBeatTimer.Start();
+
         }
 
         /// <summary>
@@ -196,15 +215,30 @@ namespace MewtocolNet {
             if (heartbeatNeedsRun) {
 
                 await HeartbeatTickTask();
+                
                 heartbeatNeedsRun = false;
             
             }
 
             var sw = Stopwatch.StartNew();
 
-            await memoryManager.PollAllAreasAsync();
+            await memoryManager.PollAllAreasAsync(async () => {
+
+                if (userInputSendTasks != null && userInputSendTasks.Count > 0) {
+
+                    var t = userInputSendTasks.Dequeue();
+
+                    t.Start();
+
+                    await t;
+
+                }
+
+            });
 
             sw.Stop();
+
+            pollerFirstCycleCompleted = true;
             PollerCycleDurationMs = (int)sw.ElapsedMilliseconds;
 
         }
diff --git a/MewtocolNet/MewtocolInterfaceRequests.cs b/MewtocolNet/MewtocolInterfaceRequests.cs
index 6537024..94a0760 100644
--- a/MewtocolNet/MewtocolInterfaceRequests.cs
+++ b/MewtocolNet/MewtocolInterfaceRequests.cs
@@ -7,6 +7,8 @@ using System.Net.Sockets;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
+using MewtocolNet.Helpers;
+using System.Reflection;
 
 namespace MewtocolNet {
 
@@ -14,6 +16,8 @@ namespace MewtocolNet {
 
         internal bool isConnectingStage = false;
 
+        internal protected bool isReconnectingStage = false;
+
         internal int maxDataBlocksPerWrite = 8;
 
         private CancellationTokenSource tTaskCancelSource = new CancellationTokenSource();
@@ -24,17 +28,17 @@ namespace MewtocolNet {
         /// Gets generic information about the PLC
         /// </summary>
         /// <returns>A PLCInfo class</returns>
-        public async Task<PLCInfo> GetPLCInfoAsync(int timeout = -1) {
+        public async Task<PLCInfo> GetInfoAsync(bool detailed = true) {
 
-            MewtocolFrameResponse resRT = await SendCommandAsync("%EE#RT");
+            MewtocolFrameResponse resRT = await SendCommandInternalAsync("%EE#RT");
 
-            if (!resRT.Success) return null;
+            if (!resRT.Success || tSource.Token.IsCancellationRequested) return null;
 
             MewtocolFrameResponse? resEXRT = null;
 
-            if(isConnectingStage) {
+            if (isConnectingStage && detailed) {
 
-                resEXRT = await SendCommandAsync("%EE#EX00RT00");
+                resEXRT = await SendCommandInternalAsync("%EE#EX00RT00");
 
             }
 
@@ -50,19 +54,21 @@ namespace MewtocolNet {
 
             }
 
+            if(!detailed) return plcInf;
+
             //overwrite first with EXRT only on connecting stage
             if (isConnectingStage && resEXRT != null && resEXRT.Value.Success && !plcInf.TryExtendFromEXRT(resEXRT.Value.Response)) {
 
                 throw new Exception("The EXRT message could not be parsed");
 
-            } 
+            }
 
-            if(isConnectingStage) {
+            if (isConnectingStage) {
                 //set the intial obj
                 PlcInfo = plcInf;
             } else {
                 //update the obj with RT dynamic values only
-                PlcInfo.SelfDiagnosticError = plcInf.SelfDiagnosticError;   
+                PlcInfo.SelfDiagnosticError = plcInf.SelfDiagnosticError;
                 PlcInfo.OperationMode = plcInf.OperationMode;
             }
 
@@ -70,6 +76,55 @@ namespace MewtocolNet {
 
         }
 
+        /// <summary>
+        /// Gets the metadata information for the PLC program
+        /// </summary>
+        /// <returns>The metadata or null of it isn't used by the PLC program</returns>
+        /// <exception cref="NotSupportedException"></exception>
+        public async Task<PlcMetadata> GetMetadataAsync() {
+
+            //if the prog capacity and plc type are unknown retrieve them first
+            if (PlcInfo == null) await GetInfoAsync();
+
+            //still 0 
+            if (PlcInfo.ProgramCapacity == 0) throw new NotSupportedException("Unable to access the program capacity of the PLC");
+
+            //meta data is always at last dt addresses of the plc
+            //so we take the capacity in k and multiply by 1024 to get the last register index and sub 3
+            //to get the last readable registers
+
+            var endAddress = (int)PlcInfo.ProgramCapacity * 1024 - 3; //32765 for 32k
+            var readBytes = 42;
+
+            var metaMarker = new byte[] { 0x4D, 0x65, 0x74, 0x41 };
+
+            var data = await ReadByteRangeNonBlocking(endAddress - 2 - (readBytes / 2), readBytes);
+
+            if (data != null && data.SearchBytePattern(metaMarker) == readBytes - 4) {
+
+                var meta = new PlcMetadata {
+
+                    LastUserLibChangeDate = PlcBitConverter.ToDateTime(data, 0),
+                    LastPouChangeDate = PlcBitConverter.ToDateTime(data, 4),
+                    LastConfigChangeDate = PlcBitConverter.ToDateTime(data, 8),
+                    FPWinVersion = PlcBitConverter.ToVersionNumber(data, 12),
+                    ProjectVersion = PlcBitConverter.ToVersionNumber(data, 16),
+                    ProjectID = BitConverter.ToUInt32(data, 20),
+                    ApplicationID = BitConverter.ToUInt32(data, 24),
+                    CompanyID = BitConverter.ToUInt32(data, 28),
+                    MetaDataVersion = PlcBitConverter.ToVersionNumber(data, 32),
+                };
+
+                PlcInfo.Metadata = meta;
+
+                return meta;
+
+            }
+
+            return null;
+
+        }
+
         #endregion
 
         #region Operation mode changing 
@@ -80,7 +135,7 @@ namespace MewtocolNet {
             string modeChar = setRun ? "R" : "P";
 
             string requeststring = $"%{GetStationNumber()}#RM{modeChar}";
-            var result = await SendCommandAsync(requeststring);
+            var result = await SendCommandInternalAsync(requeststring);
 
             if (result.Success) {
                 Logger.Log($"Operation mode was changed to {(setRun ? "Run" : "Prog")}", LogLevel.Info, this);
@@ -93,7 +148,7 @@ namespace MewtocolNet {
         }
 
         /// <inheritdoc/>
-        public async Task<bool> RestartProgramAsync () {
+        public async Task<bool> RestartProgramAsync() {
 
             return await SetOperationModeAsync(false) &&
                    await SetOperationModeAsync(true);
@@ -101,14 +156,23 @@ namespace MewtocolNet {
         }
 
         /// <inheritdoc/>
-        public async Task FactoryResetAsync () {
+        public async Task<bool> ToggleOperationModeAsync() {
+
+            var currMode = await GetInfoAsync(false);
+
+            return await SetOperationModeAsync(!currMode.IsRunMode);
+
+        }
+
+        /// <inheritdoc/>
+        public async Task FactoryResetAsync() {
 
             //set to prog mode
             await SetOperationModeAsync(false);
 
             //reset plc
-            await SendCommandAsync($"%{GetStationNumber()}#0F");
-            await SendCommandAsync($"%{GetStationNumber()}#21");
+            await SendCommandInternalAsync($"%{GetStationNumber()}#0F");
+            await SendCommandInternalAsync($"%{GetStationNumber()}#21");
 
         }
 
@@ -116,13 +180,13 @@ namespace MewtocolNet {
 
         #region Program Read / Write
 
-        public async Task<PlcBinaryProgram> ReadProgramAsync () {
+        public async Task<PlcBinaryProgram> ReadProgramAsync() {
 
             var steps = new List<byte[]>();
 
             int i = 0;
             int stepsPerReq = 50;
-            while(i < int.MaxValue) {
+            while (i < int.MaxValue) {
 
                 var sb = new StringBuilder($"%{GetStationNumber()}#RP");
                 var stp1 = (i * stepsPerReq);
@@ -131,7 +195,7 @@ namespace MewtocolNet {
                 sb.Append(stp1.ToString().PadLeft(5, '0'));
                 sb.Append(stp2.ToString().PadLeft(5, '0'));
 
-                var res = await SendCommandAsync(sb.ToString());
+                var res = await SendCommandInternalAsync(sb.ToString());
 
                 if (res.Success) {
 
@@ -143,8 +207,8 @@ namespace MewtocolNet {
                         if (split[0] == 0xFF && split[1] == 0xFF) break;
                         steps.Add(split);
                     }
-                
-                    if (foundEndPattern != -1) {    
+
+                    if (foundEndPattern != -1) {
 
                         break;
 
@@ -156,8 +220,8 @@ namespace MewtocolNet {
 
             }
 
-            return new PlcBinaryProgram { 
-                rawSteps = steps,   
+            return new PlcBinaryProgram {
+                rawSteps = steps,
             };
 
         }
@@ -188,7 +252,7 @@ namespace MewtocolNet {
             string endStr = (start + wordLength - 1).ToString().PadLeft(5, '0');
 
             string requeststring = $"%{GetStationNumber()}#WDD{startStr}{endStr}{byteString}";
-            var result = await SendCommandAsync(requeststring);
+            var result = await SendCommandInternalAsync(requeststring);
 
             return result.Success;
 
@@ -216,9 +280,9 @@ namespace MewtocolNet {
             int blocksOverflow = wordLength % maxReadBlockSize;
             int totalBlocksToRead = blocksOverflow != 0 ? blocksToReadNoOverflow + 1 : blocksToReadNoOverflow;
 
-            List<byte> readBytes = new List<byte>();    
+            List<byte> readBytes = new List<byte>();
 
-            async Task ReadBlock (int wordStart, int wordEnd, Action<double> readProg) {
+            async Task ReadBlock(int wordStart, int wordEnd, Action<double> readProg) {
 
                 int blockSize = wordEnd - wordStart + 1;
                 string startStr = wordStart.ToString().PadLeft(5, '0');
@@ -226,13 +290,13 @@ namespace MewtocolNet {
 
                 string requeststring = $"%{GetStationNumber()}#RDD{startStr}{endStr}";
 
-                var result = await SendCommandAsync(requeststring, onReceiveProgress: readProg);
+                var result = await SendCommandInternalAsync(requeststring, onReceiveProgress: readProg);
 
                 if (result.Success && !string.IsNullOrEmpty(result.Response)) {
 
                     var bytes = result.Response.ParseDTRawStringAsBytes();
 
-                    if(bytes != null)
+                    if (bytes != null)
                         readBytes.AddRange(bytes);
 
                 }
@@ -253,7 +317,7 @@ namespace MewtocolNet {
                         var toplevelProg = (double)(i + 1) / totalBlocksToRead;
                         onProgress(toplevelProg * p);
                     }
-                        
+
                 });
 
                 //read remaining block
@@ -265,7 +329,7 @@ namespace MewtocolNet {
                     curWordStart = start + ((i + 1) * maxReadBlockSize);
                     curWordEnd = curWordStart + blocksOverflow - 1;
 
-                    await ReadBlock(curWordStart, curWordEnd, (p) => {});
+                    await ReadBlock(curWordStart, curWordEnd, (p) => { });
 
                 }
 
diff --git a/MewtocolNet/MewtocolInterfaceSerial.cs b/MewtocolNet/MewtocolInterfaceSerial.cs
index 83f826b..3828c50 100644
--- a/MewtocolNet/MewtocolInterfaceSerial.cs
+++ b/MewtocolNet/MewtocolInterfaceSerial.cs
@@ -252,10 +252,12 @@ namespace MewtocolNet {
 
                 Logger.Log($"Opened [SERIAL]: {GetConnectionInfo()}", LogLevel.Critical, this);
 
-                var plcinf = await GetPLCInfoAsync(100);
+                var plcinf = await GetInfoAsync();
 
                 if (plcinf == null) CloseClient();
 
+                if (alwaysGetMetadata) await GetMetadataAsync();
+
                 return plcinf;
 
             } catch (UnauthorizedAccessException) {
diff --git a/MewtocolNet/MewtocolInterfaceTcp.cs b/MewtocolNet/MewtocolInterfaceTcp.cs
index 0fe3a2b..4e10e69 100644
--- a/MewtocolNet/MewtocolInterfaceTcp.cs
+++ b/MewtocolNet/MewtocolInterfaceTcp.cs
@@ -140,14 +140,13 @@ namespace MewtocolNet {
                 stream = client.GetStream();
                 stream.ReadTimeout = 1000;
 
-                //try to abort any non read message
-                //await SendNoResponseCommandAsync($"%{GetStationNumber()}#AB");
-
                 //get plc info
-                var plcinf = await GetPLCInfoAsync(ConnectTimeout);
+                var plcinf = await GetInfoAsync();
 
                 if (plcinf != null) {
 
+                    if(alwaysGetMetadata) await GetMetadataAsync();
+
                     IsConnected = true;
                     await base.ConnectAsync(callBack);
                     OnConnected(plcinf);
@@ -177,57 +176,73 @@ namespace MewtocolNet {
                 firstPollTask = new Task(() => { });
 
                 Logger.Log($">> Reconnect start <<", LogLevel.Verbose, this);
-
+                
+                isReconnectingStage = true; 
                 isConnectingStage = true;
+                IsConnected = false;
 
                 BuildTcpClient();
 
                 var result = client.BeginConnect(ipAddr, Port, null, null);
-                var success = result.AsyncWaitHandle.WaitOne(TimeSpan.FromMilliseconds(conTimeout));
+                var success = result.AsyncWaitHandle.WaitOne(TimeSpan.FromMilliseconds(ConnectTimeout));
 
                 if (!success || !client.Connected) {
 
                     Logger.Log("The PLC connection timed out", LogLevel.Error, this);
                     OnMajorSocketExceptionWhileConnecting();
                     return;
+
                 }
 
                 Logger.LogVerbose("TCP/IP Client connected", this);
 
                 if (HostEndpoint == null) {
                     var ep = (IPEndPoint)client.Client.LocalEndPoint;
-                    Logger.Log($"Connecting [AUTO] endpoint: {ep.Address.MapToIPv4()}:{ep.Port}", LogLevel.Info, this);
+                    Logger.Log($"Connecting [AUTO] from: {ep.Address.MapToIPv4()}:{ep.Port} to {GetConnectionInfo()}", LogLevel.Info, this);
                 }
 
                 //get the stream
                 stream = client.GetStream();
                 stream.ReadTimeout = 1000;
 
-                Logger.LogVerbose("Attached stream, getting PLC info", this);
+                isMessageLocked = false;
 
-                //get plc info
-                var plcinf = await GetPLCInfoAsync(ConnectTimeout);
+                //null ongoing tasks
+                regularSendTask = null;
+                reconnectTask = Task.CompletedTask;
 
-                if (plcinf != null) {
+                //try to abort any non read message
+                //await SendNoResponseCommandAsync($"%{GetStationNumber()}#AB");
 
-                    IsConnected = true;
-                    await base.ConnectAsync();
+                //get plc info 2 times to clear old stuff from the buffer
 
-                    Logger.LogVerbose("Connection re-established", this);
-                    OnConnected(plcinf);
+                OnReconnected();
 
-                } else {
+                //var plcinf = await SendCommandAsync($"%{GetStationNumber()}#RT");
 
-                    Logger.Log("Initial connection failed", LogLevel.Error, this);
-                    OnDisconnect();
+                //if (plcinf != null) {
 
-                }
+                //    Logger.Log("Reconnect successfull");
+
+                //    OnReconnected();
+
+                //    //await base.ConnectAsync();
+                //    //OnConnected(plcinf);
+
+                //} else {
+
+                //    Logger.Log("Initial connection failed", LogLevel.Error, this);
+                //    OnDisconnect();
+
+                //}
 
                 await Task.CompletedTask;
 
-            } catch (Exception ex) {
+            } catch (SocketException) {
 
-                Logger.LogError($"Reconnect exception: {ex.Message}");
+                OnMajorSocketExceptionWhileConnecting();
+                isConnectingStage = false;
+                isReconnectingStage = false;
 
             }
 
diff --git a/MewtocolNet/PLCInfo.cs b/MewtocolNet/PLCInfo.cs
index e01f299..4a91348 100644
--- a/MewtocolNet/PLCInfo.cs
+++ b/MewtocolNet/PLCInfo.cs
@@ -18,6 +18,7 @@ namespace MewtocolNet {
         private OPMode operationMode;
         private HWInformation hardwareInformation;
         private string selfDiagnosticError;
+        private PlcMetadata metadata;
        
         /// <summary>
         /// The type of the PLC named by Panasonic
@@ -103,6 +104,17 @@ namespace MewtocolNet {
         /// </summary>
         public bool IsRunMode => OperationMode.HasFlag(OPMode.RunMode);
 
+        /// <summary>
+        /// Contains useful information about the PLC program and metadata
+        /// </summary>
+        public PlcMetadata Metadata {
+            get => metadata;
+            internal set {
+                metadata = value;   
+                OnPropChange(); 
+            }
+        }
+
         public event PropertyChangedEventHandler PropertyChanged;
 
         internal bool TryExtendFromEXRT(string msg) {
diff --git a/MewtocolNet/PlcMetadata.cs b/MewtocolNet/PlcMetadata.cs
new file mode 100644
index 0000000..23635bf
--- /dev/null
+++ b/MewtocolNet/PlcMetadata.cs
@@ -0,0 +1,56 @@
+using System;
+
+namespace MewtocolNet {
+    /// <summary>
+    /// Contains useful information about the PLC program and metadata
+    /// </summary>
+    public class PlcMetadata {
+
+        /// <summary>
+        /// The last date the used user librarys were changed
+        /// </summary>
+        public DateTime LastUserLibChangeDate { get; internal set; }
+
+        /// <summary>
+        /// The last date the program Pou's were changed
+        /// </summary>
+        public DateTime LastPouChangeDate { get; internal set; }
+
+        /// <summary>
+        /// The last date the PLC configuration was changed
+        /// </summary>
+        public DateTime LastConfigChangeDate { get; internal set; }
+
+        /// <summary>
+        /// The used FP-Win version to create the PLC program
+        /// </summary>
+        public string FPWinVersion { get; internal set; }
+
+        /// <summary>
+        /// The custom project version of the PLC program
+        /// </summary>
+        public string ProjectVersion { get; internal set; }
+
+        /// <summary>
+        /// Metadata format version
+        /// </summary>
+        public string MetaDataVersion { get; internal set; }
+
+        /// <summary>
+        /// The project ID of the PLC program
+        /// </summary>
+        public uint ProjectID { get; internal set; }
+
+        /// <summary>
+        /// The application / machine specific ID for the PLC program
+        /// </summary>
+        public uint ApplicationID { get; internal set; }
+
+        /// <summary>
+        /// The company ID of the PLC program creator
+        /// </summary>
+        public uint CompanyID { get; internal set; }
+
+    }
+
+}
\ No newline at end of file
diff --git a/MewtocolNet/Registers/Base/Register.cs b/MewtocolNet/Registers/Base/Register.cs
index 57cf62b..f448195 100644
--- a/MewtocolNet/Registers/Base/Register.cs
+++ b/MewtocolNet/Registers/Base/Register.cs
@@ -134,6 +134,8 @@ namespace MewtocolNet.Registers {
 
         protected void TriggerUpdateReceived () {
 
+            if (timeSinceLastUpdate == null) return;
+
             updateCountTimerCycle++;
             
             if(updateCountTimerCycle >= 1) {
diff --git a/MewtocolNet/Registers/Classes/StringRegister.cs b/MewtocolNet/Registers/Classes/StringRegister.cs
index 6a8d348..40b7cbf 100644
--- a/MewtocolNet/Registers/Classes/StringRegister.cs
+++ b/MewtocolNet/Registers/Classes/StringRegister.cs
@@ -123,7 +123,9 @@ namespace MewtocolNet.Registers {
             //if string correct the sizing of the byte hint was wrong
             var reservedSize = BitConverter.ToInt16(bytes, 0);
 
-            if (reservedStringLength != reservedSize)
+            if (reservedStringLength != reservedSize && 
+                attachedInterface.PlcInfo.IsRunMode && 
+                (attachedInterface.pollerTaskStopped || attachedInterface.pollerFirstCycleCompleted))
                 throw new NotSupportedException(
                     $"The STRING register at {GetMewName()} is not correctly sized, " +
                     $"the size should be STRING[{reservedSize}] instead of STRING[{reservedStringLength}]"
diff --git a/MewtocolNet/SetupClasses/InterfaceSettings.cs b/MewtocolNet/SetupClasses/InterfaceSettings.cs
index 8db7485..fc0a0c6 100644
--- a/MewtocolNet/SetupClasses/InterfaceSettings.cs
+++ b/MewtocolNet/SetupClasses/InterfaceSettings.cs
@@ -41,6 +41,11 @@ namespace MewtocolNet.SetupClasses {
         /// </summary>
         public int SendReceiveTimeoutMs { get; set; } = 1000;
 
+        /// <summary>
+        /// The heartbeat interval in milliseconds, it is recommended to use 3000ms
+        /// </summary>
+        public int HeartbeatIntervalMs { get; set; } = 3000;
+
         /// <summary>
         /// Number of attempts to try and reconnect to the plc, 0 for none
         /// </summary>
@@ -51,6 +56,11 @@ namespace MewtocolNet.SetupClasses {
         /// </summary>
         public int TryReconnectDelayMs { get; set; } = 2000;
 
+        /// <summary>
+        /// Sets wether or not the interface should always retrieve metadata on connection start
+        /// </summary>
+        public bool AlwaysGetMetadata { get; set; } = true; 
+
     }
 
 }
diff --git a/MewtocolNet/UnderlyingRegisters/DTArea.cs b/MewtocolNet/UnderlyingRegisters/DTArea.cs
index ad8c675..d745547 100644
--- a/MewtocolNet/UnderlyingRegisters/DTArea.cs
+++ b/MewtocolNet/UnderlyingRegisters/DTArea.cs
@@ -106,9 +106,13 @@ namespace MewtocolNet.UnderlyingRegisters {
         private void SetUnderlyingBytes(byte[] bytes, ulong addStart) {
 
             int copyOffset = (int)((addStart - addressStart) * 2);
-            bytes.CopyTo(underlyingBytes, copyOffset);
 
-            UpdateAreaRegisterValues();
+            if(bytes.Length + copyOffset <= underlyingBytes.Length) {
+
+                bytes.CopyTo(underlyingBytes, copyOffset);
+                UpdateAreaRegisterValues();
+
+            }
 
         }
 
diff --git a/MewtocolNet/UnderlyingRegisters/MemoryAreaManager.cs b/MewtocolNet/UnderlyingRegisters/MemoryAreaManager.cs
index 60be99b..5d63054 100644
--- a/MewtocolNet/UnderlyingRegisters/MemoryAreaManager.cs
+++ b/MewtocolNet/UnderlyingRegisters/MemoryAreaManager.cs
@@ -314,7 +314,7 @@ namespace MewtocolNet.UnderlyingRegisters {
 
         }
 
-        internal async Task PollAllAreasAsync() {
+        internal async Task PollAllAreasAsync(Func<Task> inbetweenCallback) {
 
             foreach (var pollLevel in pollLevels) {
 
@@ -363,6 +363,8 @@ namespace MewtocolNet.UnderlyingRegisters {
                     //set the whole memory area at once
                     await dtArea.RequestByteReadAsync(dtArea.AddressStart, dtArea.AddressEnd);
 
+                    await inbetweenCallback();
+
                 }
 
                 pollLevel.lastReadTimeMs = (int)sw.Elapsed.TotalMilliseconds;