Exception of type 'uPLibrary.Networking.M2Mqtt.Exceptions.MqttClientException' was thrown
<p>I am connecting to the <strong>mqtt</strong> and I am receiving an un-helpful exception.</p>

<p><strong>Code</strong></p>

<pre><code>string smsTopic = ConfigurationManager.AppSettings["MQTT_SMS_Topic"];
string emailTopic = ConfigurationManager.AppSettings["MQTT_Email_Topic"];
string pushTopic = ConfigurationManager.AppSettings["MQTT_PUSH_Topic"];
string socialTopic = ConfigurationManager.AppSettings["MQTT_SOCIAL_Topic"];

client = new MqttClient("somehostname");
string clientId = Guid.NewGuid().ToString();
client.Connect(clientId);
client.MqttMsgPublishReceived += client_MqttMsgPublishReceived;
client.Subscribe(new string[] { smsTopic, emailTopic, pushTopic, socialTopic }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
</code></pre>

<p><strong>Exception Message</strong></p>

<blockquote>
  <p>Exception of type 'uPLibrary.Networking.M2Mqtt.Exceptions.MqttClientException' was thrown</p>
</blockquote>

<p><strong>Stacktrace of the exception</strong></p>

<pre><code>at uPLibrary.Networking.M2Mqtt.Messages.MqttMsgSubscribe.GetBytes(Byte protocolVersion) in c:\Users\ppatierno\Source\Repos\m2mqtt\M2Mqtt\Messages\MqttMsgSubscribe.cs:line 187
at uPLibrary.Networking.M2Mqtt.MqttClient.Send(MqttMsgBase msg) in c:\Users\ppatierno\Source\Repos\m2mqtt\M2Mqtt\MqttClient.cs:line 1028
at uPLibrary.Networking.M2Mqtt.MqttClient.ProcessInflightThread() in c:\Users\ppatierno\Source\Repos\m2mqtt\M2Mqtt\MqttClient.cs:line 1954
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
</code></pre>

<p>I founded a <a href="https://github.com/eclipse/paho.mqtt.m2mqtt/issues/5" rel="noreferrer">bug on the github</a>, but without solution</p>

<p>The exception Message is not helpful at all, and there is NO inner exception inside it.</p>