From d3f5a8d09909e9cd81dcbd0d76a31501b529ca26 Mon Sep 17 00:00:00 2001
From: Marcos Pereira <marcos.pereira@tecwash.pt>
Date: Wed, 9 Mar 2016 14:26:54 +0000
Subject: [PATCH 1/3] Write struct and multiple bytes from a specific start
 bytes address.

---
 S7.Net.Core/PLC.cs | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/S7.Net.Core/PLC.cs b/S7.Net.Core/PLC.cs
index f7d32a9..b1fa1d4 100644
--- a/S7.Net.Core/PLC.cs
+++ b/S7.Net.Core/PLC.cs
@@ -803,9 +803,14 @@ namespace S7.Net
         }
 
         public ErrorCode WriteStruct(object structValue, int db)
+        {
+            return WriteStruct(structValue, db, 0);
+        }
+
+        public ErrorCode WriteStruct(object structValue, int db, int startByteAdr)
         {
             var bytes = Types.Struct.ToBytes(structValue).ToList();
-            var errCode = WriteMultipleBytes(bytes, db);
+            var errCode = WriteMultipleBytes(bytes, db, startByteAdr);
             return errCode;
         }
 
@@ -823,9 +828,14 @@ namespace S7.Net
         /// <param name="db">The DB number</param>
         /// <returns>ErrorCode when writing (NoError if everything was ok)</returns>
         private ErrorCode WriteMultipleBytes(List<byte> bytes, int db)
+        {
+            return WriteMultipleBytes(bytes, db, 0);
+        }
+
+        private ErrorCode WriteMultipleBytes(List<byte> bytes, int db, int startByteAdr)
         {
             ErrorCode errCode = ErrorCode.NoError;
-            int index = 0;
+            int index = startByteAdr;
             try
             {
                 while (bytes.Count > 0)

From 3e877cad7c3f7a3c3ec141b84173cf2c7e2bc085 Mon Sep 17 00:00:00 2001
From: Marcos Pereira <marcos.pereira@tecwash.pt>
Date: Wed, 9 Mar 2016 14:30:20 +0000
Subject: [PATCH 2/3] Read structs recursively on get struct size and build
 struct from bytes.

---
 S7.Net.Common/Types/Struct.cs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/S7.Net.Common/Types/Struct.cs b/S7.Net.Common/Types/Struct.cs
index 9ecf2bf..15214b2 100644
--- a/S7.Net.Common/Types/Struct.cs
+++ b/S7.Net.Common/Types/Struct.cs
@@ -49,6 +49,9 @@ namespace S7.Net.Types
                             numBytes++;
                         numBytes += 4;
                         break;
+                    default:
+                        numBytes += GetStructSize(info.FieldType);
+                        break;
                 }
             }
             return (int)numBytes;
@@ -146,6 +149,14 @@ namespace S7.Net.Types
                                                                            bytes[(int)numBytes + 3] }));
                         numBytes += 4;
                         break;
+                    default:
+                        var buffer = new byte[GetStructSize(info.FieldType)];
+                        if (buffer.Length == 0)
+                            continue;
+                        Buffer.BlockCopy(bytes, (int)Math.Ceiling(numBytes), buffer, 0, buffer.Length);
+                        info.SetValue(structValue, FromBytes(info.FieldType, buffer));
+                        numBytes += buffer.Length;
+                        break;
                 }
             }
             return structValue;

From 5dcd52e9d2ccaf6f20745d8d486c442e0f815355 Mon Sep 17 00:00:00 2001
From: Marcos Pereira <marcos.pereira@tecwash.pt>
Date: Wed, 9 Mar 2016 14:32:19 +0000
Subject: [PATCH 3/3] Write struct and multiple bytes from a specific start
 bytes address.

---
 S7.Net/PLC.cs | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/S7.Net/PLC.cs b/S7.Net/PLC.cs
index a0b4abf..554b89a 100644
--- a/S7.Net/PLC.cs
+++ b/S7.Net/PLC.cs
@@ -803,9 +803,14 @@ namespace S7.Net
         }
 
         public ErrorCode WriteStruct(object structValue, int db)
+        {
+            return WriteStruct(structValue, db, 0);
+        }
+
+        public ErrorCode WriteStruct(object structValue, int db, int startByteAdr)
         {
             var bytes = Types.Struct.ToBytes(structValue).ToList();
-            var errCode = WriteMultipleBytes(bytes, db);
+            var errCode = WriteMultipleBytes(bytes, db, startByteAdr);
             return errCode;
         }
 
@@ -823,9 +828,14 @@ namespace S7.Net
         /// <param name="db">The DB number</param>
         /// <returns>ErrorCode when writing (NoError if everything was ok)</returns>
         private ErrorCode WriteMultipleBytes(List<byte> bytes, int db)
+        {
+            return WriteMultipleBytes(bytes, db, 0);
+        }
+
+        private ErrorCode WriteMultipleBytes(List<byte> bytes, int db, int startByteAdr)
         {
             ErrorCode errCode = ErrorCode.NoError;
-            int index = 0;
+            int index = startByteAdr;
             try
             {
                 while (bytes.Count > 0)