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+# PubSub
+
+## Qos 
+
+PubQos | SubQos | In Message | Out Message
+-------|--------|------------|-------------
+   0   |   0    |   -        | - 
+   0   |   1    |   -        | - 
+   0   |   2    |   -        | - 
+   1   |   0    |   -        | - 
+   1   |   1    |   -        | - 
+   1   |   2    |   -        | - 
+   2   |   0    |   -        | - 
+   2   |   1    |   -        | - 
+   2   |   2    |   -        | - 
+
+## Publish
+
+
diff --git a/doc/retain.md b/doc/retain.md
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+# Retained Message
+
+## API
+
+store(
+
diff --git a/doc/user-guide.md b/doc/user-guide.md
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+# eMQTT User Guide
+
+## Introduction
+
+## Installation
+
+### Install Requirements
+
+## Configuration
+
+## Cluster
+
+## Bridge
+