Add statistics of last sent packets to the _ConnectedClient_.

Tests/MQTTnet.TestApp.NetCore/Program.cs

@@ -40,7 +40,7 @@ namespace MQTTnet.TestApp.NetCore
 
             Thread.Sleep(Timeout.Infinite);
         }
-        
+
         // This code is used at the Wiki on GitHub!
         // ReSharper disable once UnusedMember.Local
         private static async void WikiCode()
@@ -71,6 +71,26 @@ namespace MQTTnet.TestApp.NetCore
                 var factory = new MqttFactory();
                 var client = factory.CreateMqttClient();
             }
+
+            {
+                // Write all trace messages to the console window.
+                MqttNetGlobalLogger.LogMessagePublished += (s, e) =>
+                {
+                    var trace = $">> [{e.TraceMessage.Timestamp:O}] [{e.TraceMessage.ThreadId}] [{e.TraceMessage.Source}] [{e.TraceMessage.Level}]: {e.TraceMessage.Message}";
+                    if (e.TraceMessage.Exception != null)
+                    {
+                        trace += Environment.NewLine + e.TraceMessage.Exception.ToString();
+                    }
+
+                    Console.WriteLine(trace);
+                };
+            }
+
+            {
+                // Use a custom log ID for the logger.
+                var factory = new MqttFactory();
+                var mqttClient = factory.CreateMqttClient(new MqttNetLogger("MyCustomId"));
+            }
         }
     }
 
@@ -106,4 +126,4 @@ namespace MQTTnet.TestApp.NetCore
             return Task.FromResult(retainedMessages);
         }
     }
-}
+}