Quick test of a MQTT client to control PowerPoint slides

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MQTTnet;
using MQTTnet.Client;
using PPt = Microsoft.Office.Interop.PowerPoint;
using System.Runtime.InteropServices;

namespace MqttToPPt
{
    class Program
    {
        static void Main(string[] args)
        {
            MainAsync(args);
            Console.ReadLine();
        }

        static async void MainAsync(string[] args)
        {
            PPt.Application pptApplication = Marshal.GetActiveObject("PowerPoint.Application") as PPt.Application;
            PPt.Presentation presentation = pptApplication.ActivePresentation;


            // Create a new MQTT client.
            var factory = new MqttFactory();
            var mqttClient = factory.CreateMqttClient();

            // Create TCP based options using the builder.
            var options = new MqttClientOptionsBuilder()
                .WithClientId(/* Random GUID */)
                .WithTcpServer("io.adafruit.com")
                .WithCredentials(/* Your Adafruit IO username */, /* Your Adafruit IO key */)
                .WithTls()
                .WithCleanSession()
                .Build();

            mqttClient.ApplicationMessageReceived += (s, e) =>
            {
                Console.WriteLine("### RECEIVED APPLICATION MESSAGE ###");
                Console.WriteLine($"+ Topic = {e.ApplicationMessage.Topic}");
                Console.WriteLine($"+ Payload = {Encoding.UTF8.GetString(e.ApplicationMessage.Payload)}");
                Console.WriteLine($"+ QoS = {e.ApplicationMessage.QualityOfServiceLevel}");
                Console.WriteLine($"+ Retain = {e.ApplicationMessage.Retain}");
                Console.WriteLine();
                switch (Encoding.UTF8.GetString(e.ApplicationMessage.Payload))
                {
                    case "next":
                        Console.WriteLine("next slide");
                        pptApplication.SlideShowWindows[1].View.Next();
                        break;
                    case "prev":
                        Console.WriteLine("prev slide");
                        pptApplication.SlideShowWindows[1].View.Previous();
                        break;
                }
            };

            mqttClient.Connected += async (s, e) =>
            {
                Console.WriteLine("### CONNECTED WITH SERVER ###");

                // Subscribe to a topic
                await mqttClient.SubscribeAsync(new TopicFilterBuilder().WithTopic("jamesbulpin/feeds/testfeed").Build());

                Console.WriteLine("### SUBSCRIBED ###");
            };

            Console.WriteLine("Connecting to server...");
            await mqttClient.ConnectAsync(options);

        }
    }
}