add resources

add worker
fix process logic

Packages/com.tivadar.best.mqtt/Runtime/MQTT/MQTTClient.Public.cs

@@ -7,6 +7,7 @@ using Best.MQTT.Packets.Utils;
 using Best.MQTT.Transports;
 
 using System;
+using System.Diagnostics;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -295,12 +296,14 @@ namespace Best.MQTT
                 throw new ArgumentNullException(nameof(topicName));
 
             if (this.State != ClientStates.Connected)
-                throw new Exception("Can add an alias only when connected!");
+                throw new Exception($"{topicName} Can add an alias only when connected!");
 
             UInt16 aliases = this.Session.ClientTopicAliasMapping.Count();
             if (aliases >= this.NegotiatedOptions.ServerOptions.TopicAliasMaximum)
                 throw new Exception($"Can't add more alias, already reached the server's Topic Alias Maximum setting ({this.NegotiatedOptions.ServerOptions.TopicAliasMaximum})!");
 
+
+            
             this.Session.ClientTopicAliasMapping.Add(topicName, this.NegotiatedOptions.ServerOptions.TopicAliasMaximum);
         }