Added stopping for subscriptions handlers and for unsubscription handlers

netty-mqtt/src/main/java/org/thingsboard/mqtt/MqttClientImpl.java

@@ -156,9 +156,11 @@ final class MqttClientImpl implements MqttClient {
                     if (callback != null) {
                         callback.connectionLost(e);
                     }
+                    pendingSubscriptions.forEach((id, mqttPendingSubscription) -> mqttPendingSubscription.onChannelClosed());
                     pendingSubscriptions.clear();
                     serverSubscriptions.clear();
                     subscriptions.clear();
+                    pendingServerUnsubscribes.forEach((id, mqttPendingServerUnsubscribes) -> mqttPendingServerUnsubscribes.onChannelClosed());
                     pendingServerUnsubscribes.clear();
                     qos2PendingIncomingPublishes.clear();
                     pendingPublishes.forEach((id, mqttPendingPublish) -> mqttPendingPublish.onChannelClosed());

netty-mqtt/src/main/java/org/thingsboard/mqtt/MqttPendingPublish.java

@@ -24,7 +24,7 @@ import io.netty.util.concurrent.Promise;
 
 import java.util.function.Consumer;
 
-final class MqttPendingPublish {
+final class MqttPendingPublish{
 
     private final int messageId;
     private final Promise<Void> future;
@@ -99,7 +99,7 @@ final class MqttPendingPublish {
         this.pubrelRetransmissionHandler.stop();
     }
 
-    void onChannelClosed() {
+    void onChannelClosed(){
         this.publishRetransmissionHandler.stop();
         this.pubrelRetransmissionHandler.stop();
     }

netty-mqtt/src/main/java/org/thingsboard/mqtt/MqttPendingSubscription.java

@@ -23,7 +23,7 @@ import java.util.HashSet;
 import java.util.Set;
 import java.util.function.Consumer;
 
-final class MqttPendingSubscription {
+final class MqttPendingSubscription{
 
     private final Promise<Void> future;
     private final String topic;
@@ -99,4 +99,8 @@ final class MqttPendingSubscription {
             return once;
         }
     }
+
+    void onChannelClosed(){
+        this.retransmissionHandler.stop();
+    }
 }

netty-mqtt/src/main/java/org/thingsboard/mqtt/MqttPendingUnsubscription.java

@@ -21,7 +21,7 @@ import io.netty.util.concurrent.Promise;
 
 import java.util.function.Consumer;
 
-final class MqttPendingUnsubscription {
+final class MqttPendingUnsubscription{
 
     private final Promise<Void> future;
     private final String topic;
@@ -52,4 +52,8 @@ final class MqttPendingUnsubscription {
     void onUnsubackReceived(){
         this.retransmissionHandler.stop();
     }
+
+    void onChannelClosed(){
+        this.retransmissionHandler.stop();
+    }
 }