add debug output for mqtt test project

ADIS_Csharp/MqttTest/Program.cs

@@ -17,6 +17,7 @@ namespace MqttTest
             // generate a clientID and connect to Broker
             string clientId = Guid.NewGuid().ToString();
             client.Connect(clientId);
+            Console.WriteLine($"Connect result: {client.IsConnected}");
             // subscribe to a topic
             client.Subscribe(new string[] { "scada/status" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
             // Endless loop
@@ -29,7 +30,8 @@ namespace MqttTest
                     if (key.Key == ConsoleKey.Spacebar)
                     {
                         Console.WriteLine($"Sending \"Test Message\" to topic 'scada/status'");
-                        client.Publish("scada/status", Encoding.ASCII.GetBytes("Test Message"));
+                        var publishResult = client.Publish("scada/status", Encoding.ASCII.GetBytes("Test Message"));
+                        Console.WriteLine($"Publish result: {publishResult}");
                     }
                 }
             }