diff --git a/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttClientStore.java b/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttClientStore.java
index 4a9abe8d92e20fbcd91927074f82f271b3b74fff..06b8e834176900b95e05a896318f18008caa4344 100644
--- a/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttClientStore.java
+++ b/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttClientStore.java
@@ -29,7 +29,6 @@ import java.util.*;
  * @author L.cm
  */
 final class MqttClientStore {
-
 	/**
 	 * 订阅的数据承载
 	 */
@@ -39,23 +38,23 @@ final class MqttClientStore {
 	private final Map<Integer, MqttPendingPublish> pendingPublishData = new LinkedHashMap<>();
 	private final Map<Integer, MqttPendingQos2Publish> pendingQos2PublishData = new LinkedHashMap<>();
 
-	void addPaddingSubscribe(int messageId, MqttPendingSubscription pendingSubscription) {
+	protected void addPaddingSubscribe(int messageId, MqttPendingSubscription pendingSubscription) {
 		pendingSubscriptions.put(messageId, pendingSubscription);
 	}
 
-	MqttPendingSubscription getPaddingSubscribe(int messageId) {
+	protected MqttPendingSubscription getPaddingSubscribe(int messageId) {
 		return pendingSubscriptions.get(messageId);
 	}
 
-	MqttPendingSubscription removePaddingSubscribe(int messageId) {
+	protected MqttPendingSubscription removePaddingSubscribe(int messageId) {
 		return pendingSubscriptions.remove(messageId);
 	}
 
-	void addSubscription(MqttSubscription subscription) {
+	protected void addSubscription(MqttSubscription subscription) {
 		subscriptions.add(subscription.getTopicFilter(), subscription);
 	}
 
-	List<MqttSubscription> getAndCleanSubscription() {
+	protected List<MqttSubscription> getAndCleanSubscription() {
 		List<MqttSubscription> subscriptionList = new ArrayList<>();
 		for (List<MqttSubscription> mqttSubscriptions : subscriptions.values()) {
 			subscriptionList.addAll(mqttSubscriptions);
@@ -65,7 +64,7 @@ final class MqttClientStore {
 		return data;
 	}
 
-	List<MqttSubscription> getMatchedSubscription(String topicName) {
+	protected List<MqttSubscription> getMatchedSubscription(String topicName) {
 		List<MqttSubscription> subscriptionList = new ArrayList<>();
 		for (List<MqttSubscription> mqttSubscriptions : subscriptions.values()) {
 			for (MqttSubscription subscription : mqttSubscriptions) {
@@ -77,43 +76,43 @@ final class MqttClientStore {
 		return Collections.unmodifiableList(subscriptionList);
 	}
 
-	void removeSubscriptions(String topicFilter) {
+	protected void removeSubscriptions(String topicFilter) {
 		subscriptions.remove(topicFilter);
 	}
 
-	void addPaddingUnSubscribe(int messageId, MqttPendingUnSubscription pendingUnSubscription) {
+	protected void addPaddingUnSubscribe(int messageId, MqttPendingUnSubscription pendingUnSubscription) {
 		pendingUnSubscriptions.put(messageId, pendingUnSubscription);
 	}
 
-	MqttPendingUnSubscription getPaddingUnSubscribe(int messageId) {
+	protected MqttPendingUnSubscription getPaddingUnSubscribe(int messageId) {
 		return pendingUnSubscriptions.get(messageId);
 	}
 
-	MqttPendingUnSubscription removePaddingUnSubscribe(int messageId) {
+	protected MqttPendingUnSubscription removePaddingUnSubscribe(int messageId) {
 		return pendingUnSubscriptions.remove(messageId);
 	}
 
-	void addPendingPublish(int messageId, MqttPendingPublish pendingPublish) {
+	protected void addPendingPublish(int messageId, MqttPendingPublish pendingPublish) {
 		pendingPublishData.put(messageId, pendingPublish);
 	}
 
-	MqttPendingPublish getPendingPublish(int messageId) {
+	protected MqttPendingPublish getPendingPublish(int messageId) {
 		return pendingPublishData.get(messageId);
 	}
 
-	MqttPendingPublish removePendingPublish(int messageId) {
+	protected MqttPendingPublish removePendingPublish(int messageId) {
 		return pendingPublishData.remove(messageId);
 	}
 
-	void addPendingQos2Publish(int messageId, MqttPendingQos2Publish pendingQos2Publish) {
+	protected void addPendingQos2Publish(int messageId, MqttPendingQos2Publish pendingQos2Publish) {
 		pendingQos2PublishData.put(messageId, pendingQos2Publish);
 	}
 
-	MqttPendingQos2Publish getPendingQos2Publish(int messageId) {
+	protected MqttPendingQos2Publish getPendingQos2Publish(int messageId) {
 		return pendingQos2PublishData.get(messageId);
 	}
 
-	MqttPendingQos2Publish removePendingQos2Publish(int messageId) {
+	protected MqttPendingQos2Publish removePendingQos2Publish(int messageId) {
 		return pendingQos2PublishData.remove(messageId);
 	}
 
diff --git a/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttPendingSubscription.java b/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttPendingSubscription.java
index 1ed24c690a254ba00f702e1d9e2b08bc1d133235..ee02f3d3d8a0100468c7c579840d3d17f27511fd 100644
--- a/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttPendingSubscription.java
+++ b/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttPendingSubscription.java
@@ -30,15 +30,15 @@ final class MqttPendingSubscription {
 		this.retryProcessor.setOriginalMessage(message);
 	}
 
-	MqttQoS getMqttQoS() {
+	protected MqttQoS getMqttQoS() {
 		return mqttQoS;
 	}
 
-	String getTopicFilter() {
+	protected String getTopicFilter() {
 		return topicFilter;
 	}
 
-	MqttMessageListener getListener() {
+	protected MqttMessageListener getListener() {
 		return listener;
 	}
 
@@ -46,13 +46,13 @@ final class MqttPendingSubscription {
 		return new MqttSubscription(getMqttQoS(), getTopicFilter(), getListener());
 	}
 
-	void startRetransmitTimer(ScheduledThreadPoolExecutor executor, Consumer<MqttMessage> sendPacket) {
+	protected void startRetransmitTimer(ScheduledThreadPoolExecutor executor, Consumer<MqttMessage> sendPacket) {
 		this.retryProcessor.setHandle((fixedHeader, originalMessage) ->
 			sendPacket.accept(new MqttSubscribeMessage(fixedHeader, originalMessage.variableHeader(), originalMessage.payload())));
 		this.retryProcessor.start(executor);
 	}
 
-	void onSubAckReceived() {
+	protected void onSubAckReceived() {
 		this.retryProcessor.stop();
 	}
 
diff --git a/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttPendingUnSubscription.java b/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttPendingUnSubscription.java
index b802cc65f6384348d79a5712e4d4a48708cd8b9b..ce4065f4c3fb487729a31c22f23d19a66a0599b6 100644
--- a/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttPendingUnSubscription.java
+++ b/mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/client/MqttPendingUnSubscription.java
@@ -11,7 +11,6 @@ import java.util.function.Consumer;
  * MqttPendingSubscription，参考于 netty-mqtt-client
  */
 final class MqttPendingUnSubscription {
-
 	private final String topic;
 	private final RetryProcessor<MqttUnsubscribeMessage> retryProcessor = new RetryProcessor<>();
 
@@ -20,17 +19,17 @@ final class MqttPendingUnSubscription {
 		this.retryProcessor.setOriginalMessage(unSubscribeMessage);
 	}
 
-	String getTopic() {
+	protected String getTopic() {
 		return topic;
 	}
 
-	void startRetransmissionTimer(ScheduledThreadPoolExecutor executor, Consumer<MqttMessage> sendPacket) {
+	protected void startRetransmissionTimer(ScheduledThreadPoolExecutor executor, Consumer<MqttMessage> sendPacket) {
 		this.retryProcessor.setHandle((fixedHeader, originalMessage) ->
 			sendPacket.accept(new MqttUnsubscribeMessage(fixedHeader, originalMessage.variableHeader(), originalMessage.payload())));
 		this.retryProcessor.start(executor);
 	}
 
-	void onUnSubAckReceived() {
+	protected void onUnSubAckReceived() {
 		this.retryProcessor.stop();
 	}