Fixed exception handling on receive

MewtocolNet/Mewtocol/MewtocolInterface.cs

@@ -101,6 +101,8 @@ namespace MewtocolNet {
 
         internal List<Task> PriorityTasks { get; set; } = new List<Task>();
 
+        internal int SendExceptionsInRow = 0;
+
         #region Initialization
 
         /// <summary>
@@ -600,9 +602,12 @@ namespace MewtocolNet {
                     await client.ConnectAsync(ip, port);
 
                     using (NetworkStream stream = client.GetStream()) {
+
                         var message = _blockString.ToHexASCIIBytes();
                         var messageAscii = BitConverter.ToString(message).Replace("-", " ");
+
                         //send request
+                        try {
                             using (var sendStream = new MemoryStream(message)) {
                                 await sendStream.CopyToAsync(stream);
                                 Logger.Log($"OUT MSG: {_blockString}", LogLevel.Critical, this);
@@ -610,33 +615,44 @@ namespace MewtocolNet {
                                 ASCIIEncoding enc = new ASCIIEncoding();
                                 string characters = enc.GetString(message);
                             }
+                        } catch (IOException) {
+                            return null;
+                        }
+
                         //await result
                         StringBuilder response = new StringBuilder();
+                        try {
+                            
                             byte[] responseBuffer = new byte[256];
                             do {
                                 int bytes = stream.Read(responseBuffer, 0, responseBuffer.Length);
                                 response.Append(Encoding.UTF8.GetString(responseBuffer, 0, bytes));
                             }
                             while (stream.DataAvailable);
+                        } catch (IOException) {
+                            return null;
+                        }
+                       
                         sw.Stop();
                         var curCycle = (int)sw.ElapsedMilliseconds;
                         if (Math.Abs(CycleTimeMs - curCycle) > 2) {
                             CycleTimeMs = curCycle;
                         }
                         Logger.Log($"IN MSG ({(int)sw.Elapsed.TotalMilliseconds}ms): {_blockString}", LogLevel.Critical, this);
+                        SendExceptionsInRow = 0;
                         return response.ToString();
                     }
 
-                } catch (Exception) {
+                } catch (SocketException) {
 
                     if (IsConnected) {
                         CycleTimeMs = 0;
                         IsConnected = false;
                         Disconnected?.Invoke();
-                    }
-
                         KillPoller();
                         Logger.Log("The PLC connection was closed", LogLevel.Error, this);
+                    }
+
                     return null;
 
                 }

MewtocolNet/MewtocolNet.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <PackageId>MewtocolNet</PackageId>
-    <Version>0.4.0</Version>
+    <Version>0.4.1</Version>
     <Authors>Felix Weiss</Authors>
     <Company>Womed</Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>