add Csharp Mqtt Test

ADIS_Csharp/MqttTest/MqttTest.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="M2MqttDotnetCore" Version="1.1.0" />
+  </ItemGroup>
+
+</Project>

ADIS_Csharp/MqttTest/Program.cs

@@ -0,0 +1,44 @@
+using System.Text;
+using System.Threading;
+using uPLibrary.Networking.M2Mqtt;
+using uPLibrary.Networking.M2Mqtt.Messages;
+
+namespace MqttTest
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello MQTT World! Press Space to send test message to topic 'scada/status'.");
+            // creating an MqttClient object
+            var client = new uPLibrary.Networking.M2Mqtt.MqttClient("10.180.254.80");
+            // register to message received
+            client.MqttMsgPublishReceived += client_MqttMsgPublishReceived;
+            // generate a clientID and connect to Broker
+            string clientId = Guid.NewGuid().ToString();
+            client.Connect(clientId);
+            // subscribe to a topic
+            client.Subscribe(new string[] { "scada/status" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
+            // Endless loop
+            while (true)
+            {
+                Thread.Sleep(50);
+                if (Console.KeyAvailable)
+                {
+                    var key = Console.ReadKey();
+                    if (key.Key == ConsoleKey.Spacebar)
+                    {
+                        Console.WriteLine($"Sending \"Test Message\" to topic 'scada/status'");
+                        client.Publish("scada/status", Encoding.ASCII.GetBytes("Test Message"));
+                    }
+                }
+            }
+        }
+        static void client_MqttMsgPublishReceived(object sender, MqttMsgPublishEventArgs e)
+        {
+            // handle message received 
+            Console.Write("Message received: ");
+            Console.Write(Encoding.UTF8.GetString(e.Message) + "\n");
+        }
+    }
+}