release：6.0.3.71

fix(s7): 打包时pdulength不需要再次减去其他字节量

fix(s7): 打包时尝试连接一次

src/Version.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <Version>6.0.3.71-beta.2</Version>
+    <Version>6.0.3.71</Version>
   </PropertyGroup>
 
   <ItemGroup>

src/adapter/ThingsGateway.Foundation.SiemensS7/S7/Helper/PackHelper.cs

@@ -177,7 +177,7 @@ internal static class PackHelper
 
         while (maxAddress >= minAddress) // 循环，直到最大地址小于最小地址
         {
-            int readLength = siemensS7Net.PduLength == 0 ? 200 : siemensS7Net.PduLength - 28; // 读取长度为PDU长度减去28，避免超出限制
+            int readLength = siemensS7Net.PduLength == 0 ? 200 : siemensS7Net.PduLength; // 读取长度为PDU长度减去28，避免超出限制
 
             List<SiemensAddress> tempAddresses = new(); // 临时地址列表用于存储分配给单个数据包的地址
 

src/adapter/ThingsGateway.Foundation.SiemensS7/S7/SiemensS7Master.cs

@@ -102,6 +102,13 @@ public partial class SiemensS7Master : ProtocolBase
     /// <inheritdoc/>
     public override List<T> LoadSourceRead<T>(IEnumerable<IVariable> deviceVariables, int maxPack, int defaultIntervalTime)
     {
+        try
+        {
+            this.Channel.Connect();
+        }
+        catch
+        {
+        }
         return PackHelper.LoadSourceRead<T>(this, deviceVariables, maxPack, defaultIntervalTime);
     }