diff --git a/2.0/feed.xml b/2.0/feed.xml
index 50750a9..a945747 100644
--- a/2.0/feed.xml
+++ b/2.0/feed.xml
@@ -5,8 +5,8 @@
         <description>Announcements, tutorials and examples around Eclipse Ditto and Digital Twins</description>
         <link>https://www.eclipse.org/ditto/</link>
         <atom:link href="https://www.eclipse.org/ditto/feed.xml" rel="self" type="application/rss+xml"/>
-        <pubDate>Fri, 25 Jun 2021 06:19:41 +0000</pubDate>
-        <lastBuildDate>Fri, 25 Jun 2021 06:19:41 +0000</lastBuildDate>
+        <pubDate>Fri, 25 Jun 2021 11:37:15 +0000</pubDate>
+        <lastBuildDate>Fri, 25 Jun 2021 11:37:15 +0000</lastBuildDate>
         <generator>Jekyll v3.6.2</generator>
         
         <item>
diff --git a/2021-06-17-hmac-credentials.html b/2021-06-17-hmac-credentials.html
index c5eb5a7..65a4565 100644
--- a/2021-06-17-hmac-credentials.html
+++ b/2021-06-17-hmac-credentials.html
@@ -5,7 +5,7 @@
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <meta name="description" content="">
-<meta name="keywords" content="blogarchitectureconnectivityhmacazureazure iot hubazure service busazure monitoraws snssnsawssigningexample,  ">
+<meta name="keywords" content="blogarchitectureconnectivity,  ">
 <title>  Support for HMAC-SHA256 signing for connections </title>
 
 <link rel="stylesheet" href="css/syntax.css">
@@ -238,27 +238,7 @@
             
             
             
-            <a href="tag_connectivity.html">connectivity</a>, 
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
-            
+            <a href="tag_connectivity.html">connectivity</a>
             
             
             
diff --git a/blog.html b/blog.html
index 7db1cd6..0022638 100644
--- a/blog.html
+++ b/blog.html
@@ -246,47 +246,7 @@
 
                 
 
-                <a href="tag_connectivity.html">connectivity</a>, 
-
-                
-
-                <a href="tag_hmac.html">hmac</a>, 
-
-                
-
-                <a href="tag_azure.html">azure</a>, 
-
-                
-
-                <a href="tag_azure iot hub.html">azure iot hub</a>, 
-
-                
-
-                <a href="tag_azure service bus.html">azure service bus</a>, 
-
-                
-
-                <a href="tag_azure monitor.html">azure monitor</a>, 
-
-                
-
-                <a href="tag_aws sns.html">aws sns</a>, 
-
-                
-
-                <a href="tag_sns.html">sns</a>, 
-
-                
-
-                <a href="tag_aws.html">aws</a>, 
-
-                
-
-                <a href="tag_signing.html">signing</a>, 
-
-                
-
-                <a href="tag_example.html">example</a>
+                <a href="tag_connectivity.html">connectivity</a>
 
                 
         </span>
diff --git a/connectivity-mapping.html b/connectivity-mapping.html
index 8f52ca7..e653304 100644
--- a/connectivity-mapping.html
+++ b/connectivity-mapping.html
@@ -2349,6 +2349,30 @@
       <span class="c1">// parsing failed (no JSON document); return null to drop the message</span>
       <span class="k">return</span> <span class="kc">null</span><span class="p">;</span>
     <span class="p">}</span>
+  <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="nx">contentType</span> <span class="o">===</span> <span class="s1">'application/json'</span><span class="p">)</span> <span class="p">{</span>
+    <span class="kd">let</span> <span class="nx">parsedJson</span> <span class="o">=</span> <span class="nx">JSON</span><span class="p">.</span><span class="nx">parse</span><span class="p">(</span><span class="nx">textPayload</span><span class="p">);</span>
+    <span class="c1">// the following variables would be determined from the "parsedJson" and from the "headers":</span>
+    <span class="kd">let</span> <span class="nx">namespace</span> <span class="o">=</span> <span class="s2">""</span><span class="p">;</span>
+    <span class="kd">let</span> <span class="nx">name</span> <span class="o">=</span> <span class="s2">""</span><span class="p">;</span>
+    <span class="kd">let</span> <span class="nx">group</span> <span class="o">=</span> <span class="s2">"things"</span><span class="p">;</span>
+    <span class="kd">let</span> <span class="nx">channel</span> <span class="o">=</span> <span class="s2">"twin"</span><span class="p">;</span>
+    <span class="kd">let</span> <span class="nx">criterion</span> <span class="o">=</span> <span class="s2">"commands"</span><span class="p">;</span>
+    <span class="kd">let</span> <span class="nx">action</span> <span class="o">=</span> <span class="s2">"modify"</span><span class="p">;</span>
+    <span class="kd">let</span> <span class="nx">path</span> <span class="o">=</span> <span class="s2">"/attributes"</span><span class="p">;</span>
+    <span class="kd">let</span> <span class="nx">dittoHeaders</span> <span class="o">=</span> <span class="p">{};</span>
+    <span class="kd">let</span> <span class="nx">value</span> <span class="o">=</span> <span class="p">{</span>
+      <span class="s2">"a"</span><span class="p">:</span> <span class="mi">1</span>
+    <span class="p">};</span>
+    <span class="k">return</span> <span class="nx">Ditto</span><span class="p">.</span><span class="nx">buildDittoProtocolMsg</span><span class="p">(</span>
+      <span class="nx">namespace</span><span class="p">,</span> 
+      <span class="nx">name</span><span class="p">,</span> 
+      <span class="nx">group</span><span class="p">,</span> 
+      <span class="nx">channel</span><span class="p">,</span> 
+      <span class="nx">criterion</span><span class="p">,</span> 
+      <span class="nx">action</span><span class="p">,</span> 
+      <span class="nx">path</span><span class="p">,</span> 
+      <span class="nx">dittoHeaders</span><span class="p">,</span> 
+      <span class="nx">value</span><span class="p">)</span>
   <span class="p">}</span>
   <span class="c1">// no mapping logic matched; return null to drop the message</span>
   <span class="k">return</span> <span class="kc">null</span><span class="p">;</span>
@@ -2356,8 +2380,32 @@
 </code></pre></div></div>
 
 <p>The result of the function has to be a JavaScript object in <a href="protocol-overview.html">Ditto Protocol</a> or an array of 
-such JavaScript objects. That’s where the helper method <code class="highlighter-rouge">Ditto.buildDittoProtocolMsg</code> is useful: it explicitly 
-defines which parameters are required for the Ditto Protocol message.</p>
+such JavaScript objects. That’s where the helper method <code class="highlighter-rouge">Ditto.buildDittoProtocolMsg</code> is useful: 
+it explicitly defines which parameters are required for the Ditto Protocol message.</p>
+
+<p>There is another JavaScript function which is helpful when access to the complete external message is needed.
+It is possible to define the <code class="highlighter-rouge">mapToDittoProtocolMsgWrapper</code> in the incoming payload mapping and access the original
+<code class="highlighter-rouge">externalMsg</code>.</p>
+
+<p>This is the default implementation of <code class="highlighter-rouge">mapToDittoProtocolMsgWrapper</code>, delegating to <code class="highlighter-rouge">mapToDittoProtocolMsg</code>:</p>
+<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cm">/**
+ * Maps the passed external message to a Ditto Protocol message.
+ * @param {ExternalMessage} externalMsg - The external message to map to a Ditto Protocol message
+ * @returns {(DittoProtocolMessage|Array&lt;DittoProtocolMessage&gt;)} dittoProtocolMessage(s) -
+ *  The mapped Ditto Protocol message,
+ *  an array of Ditto Protocol messages or
+ *  &lt;code&gt;null&lt;/code&gt; if the message could/should not be mapped
+ */</span>
+<span class="kd">function</span> <span class="nx">mapToDittoProtocolMsgWrapper</span><span class="p">(</span><span class="nx">externalMsg</span><span class="p">)</span> <span class="p">{</span>
+
+  <span class="kd">let</span> <span class="nx">headers</span> <span class="o">=</span> <span class="nx">externalMsg</span><span class="p">.</span><span class="nx">headers</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">textPayload</span> <span class="o">=</span> <span class="nx">externalMsg</span><span class="p">.</span><span class="nx">textPayload</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">bytePayload</span> <span class="o">=</span> <span class="nx">externalMsg</span><span class="p">.</span><span class="nx">bytePayload</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">contentType</span> <span class="o">=</span> <span class="nx">externalMsg</span><span class="p">.</span><span class="nx">contentType</span><span class="p">;</span>
+
+  <span class="k">return</span> <span class="nx">mapToDittoProtocolMsg</span><span class="p">(</span><span class="nx">headers</span><span class="p">,</span> <span class="nx">textPayload</span><span class="p">,</span> <span class="nx">bytePayload</span><span class="p">,</span> <span class="nx">contentType</span><span class="p">);</span>
+<span class="p">}</span>
+</code></pre></div></div>
 
 <h3 id="mapping-outgoing-messages">Mapping outgoing messages</h3>
 
@@ -2416,9 +2464,56 @@
 <span class="p">}</span>
 </code></pre></div></div>
 
-<p>The result of the function has to be a JavaScript object or an array of JavaScript objects with the fields <code class="highlighter-rouge">headers</code>, 
-<code class="highlighter-rouge">textPayload</code>, <code class="highlighter-rouge">bytePayload</code> and <code class="highlighter-rouge">contentType</code>. That’s where the helper method <code class="highlighter-rouge">Ditto.buildExternalMsg</code> is useful: it
-explicitly defines which parameters are required for the external message.</p>
+<p>The result of the function has to be a JavaScript object or, an array of JavaScript objects with the fields <code class="highlighter-rouge">headers</code>, 
+<code class="highlighter-rouge">textPayload</code>, <code class="highlighter-rouge">bytePayload</code> and <code class="highlighter-rouge">contentType</code>. That’s where the helper method <code class="highlighter-rouge">Ditto.buildExternalMsg</code> is useful: 
+it explicitly defines which parameters are required for the external message.</p>
+
+<p>There is another JavaScript function which is helpful when access to the complete Ditto protocol message is needed.
+It is possible to define the <code class="highlighter-rouge">mapFromDittoProtocolMsgWrapper</code> in the outgoing payload mapping and access the
+original <code class="highlighter-rouge">dittoProtocolMsg</code>.<br />
+Please refer to the <a href="protocol-specification.html#dittoProtocolEnvelope">Ditto Protocol specification</a>
+to inspect which JSON fields are available when.</p>
+
+<p>This is the default implementation of <code class="highlighter-rouge">mapFromDittoProtocolMsgWrapper</code>, delegating to <code class="highlighter-rouge">mapFromDittoProtocolMsg</code>:</p>
+<div class="language-javascript highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cm">/**
+ * Maps the passed Ditto Protocol message to an external message.
+ * @param {DittoProtocolMessage} dittoProtocolMsg - The Ditto Protocol message to map
+ * @returns {(ExternalMessage|Array&lt;ExternalMessage&gt;)} externalMessage -
+ *  The mapped external message,
+ *  an array of external messages or
+ *  &lt;code&gt;null&lt;/code&gt; if the message could/should not be mapped
+ */</span>
+<span class="kd">function</span> <span class="nx">mapFromDittoProtocolMsgWrapper</span><span class="p">(</span><span class="nx">dittoProtocolMsg</span><span class="p">)</span> <span class="p">{</span>
+
+  <span class="kd">let</span> <span class="nx">topic</span> <span class="o">=</span> <span class="nx">dittoProtocolMsg</span><span class="p">.</span><span class="nx">topic</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">splitTopic</span> <span class="o">=</span> <span class="nx">topic</span><span class="p">.</span><span class="nx">split</span><span class="p">(</span><span class="s2">"/"</span><span class="p">);</span>
+
+  <span class="kd">let</span> <span class="nx">namespace</span> <span class="o">=</span> <span class="nx">splitTopic</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span>
+  <span class="kd">let</span> <span class="nx">name</span> <span class="o">=</span> <span class="nx">splitTopic</span><span class="p">[</span><span class="mi">1</span><span class="p">];</span>
+  <span class="kd">let</span> <span class="nx">group</span> <span class="o">=</span> <span class="nx">splitTopic</span><span class="p">[</span><span class="mi">2</span><span class="p">];</span>
+
+  <span class="kd">let</span> <span class="nx">channel</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">criterion</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">action</span><span class="p">;</span>
+  <span class="k">if</span> <span class="p">(</span><span class="nx">hasChannel</span><span class="p">(</span><span class="nx">group</span><span class="p">))</span> <span class="p">{</span>
+    <span class="nx">channel</span> <span class="o">=</span> <span class="nx">splitTopic</span><span class="p">[</span><span class="mi">3</span><span class="p">];</span>
+    <span class="nx">criterion</span> <span class="o">=</span> <span class="nx">splitTopic</span><span class="p">[</span><span class="mi">4</span><span class="p">];</span>
+    <span class="nx">action</span> <span class="o">=</span> <span class="nx">splitTopic</span><span class="p">[</span><span class="mi">5</span><span class="p">];</span>
+  <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
+    <span class="nx">channel</span> <span class="o">=</span> <span class="s1">'none'</span><span class="p">;</span>
+    <span class="nx">criterion</span> <span class="o">=</span> <span class="nx">splitTopic</span><span class="p">[</span><span class="mi">3</span><span class="p">];</span>
+    <span class="nx">action</span> <span class="o">=</span> <span class="nx">splitTopic</span><span class="p">[</span><span class="mi">4</span><span class="p">];</span>
+  <span class="p">}</span>
+
+  <span class="kd">let</span> <span class="nx">path</span> <span class="o">=</span> <span class="nx">dittoProtocolMsg</span><span class="p">.</span><span class="nx">path</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">dittoHeaders</span> <span class="o">=</span> <span class="nx">dittoProtocolMsg</span><span class="p">.</span><span class="nx">headers</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">value</span> <span class="o">=</span> <span class="nx">dittoProtocolMsg</span><span class="p">.</span><span class="nx">value</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">status</span> <span class="o">=</span> <span class="nx">dittoProtocolMsg</span><span class="p">.</span><span class="nx">status</span><span class="p">;</span>
+  <span class="kd">let</span> <span class="nx">extra</span> <span class="o">=</span> <span class="nx">dittoProtocolMsg</span><span class="p">.</span><span class="nx">extra</span><span class="p">;</span>
+
+  <span class="k">return</span> <span class="nx">mapFromDittoProtocolMsg</span><span class="p">(</span><span class="nx">namespace</span><span class="p">,</span> <span class="nx">name</span><span class="p">,</span> <span class="nx">group</span><span class="p">,</span> <span class="nx">channel</span><span class="p">,</span> <span class="nx">criterion</span><span class="p">,</span> <span class="nx">action</span><span class="p">,</span> <span class="nx">path</span><span class="p">,</span> <span class="nx">dittoHeaders</span><span class="p">,</span> <span class="nx">value</span><span class="p">,</span> <span class="nx">status</span><span class="p">,</span> <span class="nx">extra</span><span class="p">);</span>
+<span class="p">}</span>
+</code></pre></div></div>
 
 <h2 id="javascript-payload-types">JavaScript payload types</h2>
 
@@ -2442,7 +2537,7 @@
 
 <h3 id="byte-payloads">Byte payloads</h3>
 
-<p>Working with byte payloads is also possible but does require a little bit of knowledge about JavaScipt’s 
+<p>Working with byte payloads is also possible but does require a little bit of knowledge about JavaScript’s 
 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer">ArrayBuffer</a> 
 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray">TypedArrays</a> and
 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView">DataView</a>.</p>
@@ -2502,7 +2597,7 @@
 <h3 id="text-payload-example">Text payload example</h3>
 
 <p>Let’s assume your device sends telemetry data via <a href="https://www.eclipse.org/hono/">Eclipse Hono’s</a> MQTT adapter 
-into the cloud. And that an example payload of your device is:</p>
+into the cloud. And, that an example payload of your device is:</p>
 
 <div class="language-json highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="p">{</span><span class="w">
   </span><span class="s2">"temp"</span><span class="p">:</span><span class="w"> </span><span class="s2">"23.42 °C"</span><span class="p">,</span><span class="w">
diff --git a/connectivity-protocol-bindings-kafka2.html b/connectivity-protocol-bindings-kafka2.html
index 9326f08..2f8bbb3 100644
--- a/connectivity-protocol-bindings-kafka2.html
+++ b/connectivity-protocol-bindings-kafka2.html
@@ -1804,8 +1804,8 @@
   </span><span class="s2">"consumerCount"</span><span class="p">:</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="w">
   </span><span class="s2">"authorizationContext"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"ditto:inbound-auth-subject"</span><span class="p">],</span><span class="w">
   </span><span class="s2">"enforcement"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
-    </span><span class="s2">"input"</span><span class="p">:</span><span class="w"> </span><span class="s2">""</span><span class="p">,</span><span class="w">
-    </span><span class="s2">"filters"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">""</span><span class="p">]</span><span class="w">
+    </span><span class="s2">"input"</span><span class="p">:</span><span class="w"> </span><span class="s2">"{{ header:device_id }}"</span><span class="p">,</span><span class="w">
+    </span><span class="s2">"filters"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"{{ entity:id }}"</span><span class="p">]</span><span class="w">
   </span><span class="p">},</span><span class="w">
   </span><span class="s2">"headerMapping"</span><span class="p">:</span><span class="w"> </span><span class="p">{},</span><span class="w">
   </span><span class="s2">"payloadMapping"</span><span class="p">:</span><span class="w"> </span><span class="p">[</span><span class="s2">"Ditto"</span><span class="p">],</span><span class="w">
diff --git a/feed.xml b/feed.xml
index 2561131..e2f7df9 100644
--- a/feed.xml
+++ b/feed.xml
@@ -5,8 +5,8 @@
         <description>Announcements, tutorials and examples around Eclipse Ditto and Digital Twins</description>
         <link>https://www.eclipse.org/ditto/</link>
         <atom:link href="https://www.eclipse.org/ditto/feed.xml" rel="self" type="application/rss+xml"/>
-        <pubDate>Fri, 25 Jun 2021 06:18:36 +0000</pubDate>
-        <lastBuildDate>Fri, 25 Jun 2021 06:18:36 +0000</lastBuildDate>
+        <pubDate>Fri, 25 Jun 2021 11:35:48 +0000</pubDate>
+        <lastBuildDate>Fri, 25 Jun 2021 11:35:48 +0000</lastBuildDate>
         <generator>Jekyll v3.6.2</generator>
         
         <item>
@@ -358,26 +358,6 @@
             
             <category>connectivity</category>
             
-            <category>hmac</category>
-            
-            <category>azure</category>
-            
-            <category>azure iot hub</category>
-            
-            <category>azure service bus</category>
-            
-            <category>azure monitor</category>
-            
-            <category>aws sns</category>
-            
-            <category>sns</category>
-            
-            <category>aws</category>
-            
-            <category>signing</category>
-            
-            <category>example</category>
-            
             
         </item>
         
diff --git a/jsonschema/protocol-envelope.json b/jsonschema/protocol-envelope.json
index a7ef294..94f7186 100644
--- a/jsonschema/protocol-envelope.json
+++ b/jsonschema/protocol-envelope.json
@@ -80,6 +80,15 @@
     "extra": {
       "type": "object",
       "description": "The `extra` object contains the `extraFields` which have optionally been selected to additionally be included."
+    },
+    "revision": {
+      "type": "number",
+      "description": "For events this field contains the revision number of the event."
+    },
+    "timestamp": {
+      "type": "string",
+      "format": "date-time",
+      "description": "For events this field contains the modification timestamp of the event."
     }
   },
   "required": [
diff --git a/protocol-specification.html b/protocol-specification.html
index cd05769..1742b61 100644
--- a/protocol-specification.html
+++ b/protocol-specification.html
@@ -1871,7 +1871,7 @@
     </tr>
     <tr>
       <td><code class="highlighter-rouge">correlation-id</code></td>
-      <td>Used for correlating protocol messages (e.g. a <strong>command</strong> would have the same correlation-id as the sent back <strong>response</strong> message.</td>
+      <td>Used for correlating protocol messages (e.g. a <strong>command</strong> would have the same correlation-id as the sent back <strong>response</strong> message).</td>
       <td><code class="highlighter-rouge">String</code></td>
     </tr>
     <tr>
diff --git a/search.json b/search.json
index 385e774..e40d0ca 100644
--- a/search.json
+++ b/search.json
@@ -1526,7 +1526,7 @@
 
 {
 "title": "Support for HMAC-SHA256 signing for connections",
-"tags": "blogarchitectureconnectivityhmacazureazure iot hubazure service busazure monitoraws snssnsawssigningexample",
+"tags": "blogarchitectureconnectivity",
 "keywords": "",
 "url": "2021-06-17-hmac-credentials.html",
 "summary": ""
diff --git a/tag_advanced.html b/tag_advanced.html
index b2b0a2f..9dffb5e 100644
--- a/tag_advanced.html
+++ b/tag_advanced.html
@@ -2719,26 +2719,6 @@
         
         
         
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
 
    </tbody>
 </table>
diff --git a/tag_architecture.html b/tag_architecture.html
index 7a008b8..c530654 100644
--- a/tag_architecture.html
+++ b/tag_architecture.html
@@ -2583,26 +2583,6 @@
         
         
         
-        
-        
-        
-        
-        
-        
-        
-        
-        
-        
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         <tr><td><a href="2021-03-31-ssh-tunneling-for-managed-connections.html">Support SSH tunneling for managed connections</a></td>
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diff --git a/tag_blog.html b/tag_blog.html
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diff --git a/tag_getting_started.html b/tag_getting_started.html
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diff --git a/tag_http.html b/tag_http.html
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diff --git a/tag_installation.html b/tag_installation.html
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diff --git a/tag_protocol.html b/tag_protocol.html
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diff --git a/tag_release_notes.html b/tag_release_notes.html
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