Add sample controller with deserialization payload

Author: seikosantana

ExampleServer/MqttControllers/ViewModelController.cs

@@ -0,0 +1,29 @@
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using MQTTnet.AspNetCore.Routing;
+using MQTTnet.AspNetCore.Routing.Attributes;
+
+namespace ExampleServer.MqttControllers;
+
+[MqttController]
+public class ViewModelController: MqttBaseController
+{
+    private ILogger<ViewModelController> Logger { get; }
+    
+    public ViewModelController(ILogger<ViewModelController> logger)
+    {
+        Logger = logger;
+    }
+
+    [MqttRoute("viewmodel/{sender}")]
+    public Task DeserializeViewModel(string sender, [FromPayload] SamplePayload payload)
+    {
+        Logger.LogInformation("{Sender} says {Message}", sender, payload.Message);
+        return Accepted();
+    }
+}
+
+public class SamplePayload
+{
+    public string Message { get; set; }
+}