Add ModBus communication with hardcoded values

TestApp/Program.cs

@@ -1,10 +1,50 @@
-namespace TestApp
+using NModbus;
+using System.Net.Sockets;
+
+namespace TestApp
 {
     internal class Program
     {
         static void Main(string[] args)
         {
-            Console.WriteLine("Hello, World!");
+            while (true)
+            {
+                try
+                {
+                    ConnectToModBus();
                 }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"Error connecting to ModBus slave: {ex.Message}");
+                    Thread.Sleep(5000);
+                }
+            }
+        }
+
+        private static void ConnectToModBus()
+        {
+            var factory = new ModbusFactory();
+            var tcpClient = new TcpClient("192.168.188.21", 502);
+            var master = factory.CreateMaster(tcpClient);
+            Console.WriteLine("ModBus TCP Connection established!");
+
+            while (tcpClient.Connected)
+            {
+                try
+                {
+                    ushort input = master.ReadHoldingRegisters(1, 1000, 1)[0];
+                    ushort output = (ushort)(input + 50);
+                    master.WriteMultipleRegisters(1, 1100, new ushort[] { output });
+                    Console.WriteLine($"Register values updated to {input} + 50 = {output}");
+                    Thread.Sleep(100);
+                }
+                catch (Exception e)
+                {
+                    Console.WriteLine($"Error updating ModBus registers: {e.Message}");
+                    Thread.Sleep(1000);
+                }
+            }
+        }
+
     }
 }

TestApp/TestApp.csproj

@@ -7,4 +7,8 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="NModbus" Version="3.0.72" />
+  </ItemGroup>
+
 </Project>