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Yannick Schaus 0965e5ec24 Revert "Clean up the master branch" 
This reverts commit bad6b47ef9.

Signed-off-by: Yannick Schaus <habpanel@schaus.net>
 		2018-06-14 16:43:24 +02:00
..
readme.html Revert "Clean up the master branch" 2018-06-14 16:43:24 +02:00

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<h1 id="tcp--udp-binding">TCP &amp; UDP Binding</h1>

<p>The TCP and UDP bindings provide basic support for simple ASCII-based protocols. They send and receive data as ASCII strings. Data sent out is by default padded with a CR/LF. This should be sufficient for many home automation devices that take simple ASCII-based control commands, or that send back text-based status messages.</p>

<p>The TCP part of the binding has a built-in mechanism to keep connections to remote hosts alive, and will reset connections at regular intervals to overcome the limitation of “stalled” connections or remote hosts.</p>

<p>The TCP &amp; UDP Bindings act as a network client or as a network server.</p>

<h2 id="binding-configuration">Binding Configuration</h2>

<p>The TCP and UDP bindings can be configured in the files <code class="highlighter-rouge">services/tcp.cfg</code> and <code class="highlighter-rouge">services/udp.cfg</code>, respectively.</p>

<blockquote>
  <p>Note: This is optional for the configuration and not necessary for receiving data. Item-defintions are enough for receiving data. (Developer confirm? 20150128). There’s a bug in the binding that requires at least one udp configuration to be defined or the binding will not send UDP messages.</p>
</blockquote>

<p>The indicated default values apply to both bindings unless otherwise noted.</p>

<table>
  <thead>
    <tr>
      <th>Property</th>
      <th>Default</th>
      <th style="text-align: center">Required</th>
      <th>Description</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>refreshinterval</td>
      <td> </td>
      <td style="text-align: center">only for receiving data</td>
      <td>Refresh interval in milliseconds for polling data.  Example: <code class="highlighter-rouge">250</code></td>
    </tr>
    <tr>
      <td>port</td>
      <td> </td>
      <td style="text-align: center">only for receiving data</td>
      <td>Port to listen on for incoming connections</td>
    </tr>
    <tr>
      <td>addressmask</td>
      <td>false</td>
      <td style="text-align: center">No</td>
      <td>Set to <code class="highlighter-rouge">true</code> to allow masks in ip:port addressing, e.g. 192.168.0.1:<code class="highlighter-rouge">**</code> etc.</td>
    </tr>
    <tr>
      <td>reconnectcron</td>
      <td> </td>
      <td style="text-align: center"> </td>
      <td>Cron-like string to reconnect remote ends, e.g for unstable connection or remote ends. Example: <code class="highlighter-rouge">0 0 0 ** * ?</code></td>
    </tr>
    <tr>
      <td>retryinterval</td>
      <td> </td>
      <td style="text-align: center">No</td>
      <td>Interval between reconnection attempts when recovering from a communication error, in seconds.  Example: <code class="highlighter-rouge">5</code></td>
    </tr>
    <tr>
      <td>queue</td>
      <td>false</td>
      <td style="text-align: center">No</td>
      <td>Queue data whilst recovering from a connection problem (TCP only)</td>
    </tr>
    <tr>
      <td>buffersize</td>
      <td>1024</td>
      <td style="text-align: center">No</td>
      <td>Maximum buffer size whilst reading incoming data</td>
    </tr>
    <tr>
      <td>preamble</td>
      <td> </td>
      <td style="text-align: center">No</td>
      <td>Pre-amble string that will be put in front of data being sent</td>
    </tr>
    <tr>
      <td>postamble</td>
      <td><code class="highlighter-rouge">\r\n</code></td>
      <td style="text-align: center">No</td>
      <td>Post-amble that will be appended to data being sent</td>
    </tr>
    <tr>
      <td>blocking</td>
      <td>false`</td>
      <td style="text-align: center">No</td>
      <td>Perform all write/read (send/receive) operations in a blocking mode, e.g. the binding will wait for a reply from the remote end after data has been sent</td>
    </tr>
    <tr>
      <td>timeout</td>
      <td>3000</td>
      <td style="text-align: center">No</td>
      <td>Timeout, in milliseconds, to wait for a reply when initiating a blocking write/read operation</td>
    </tr>
    <tr>
      <td>updatewithresponse</td>
      <td>false</td>
      <td style="text-align: center">No</td>
      <td>Update the status of items using the response received from the remote end (if the remote end sends replies to commands)</td>
    </tr>
    <tr>
      <td>itemsharedconnections</td>
      <td>false</td>
      <td style="text-align: center">No</td>
      <td>Set to <code class="highlighter-rouge">true</code> to share connections within the item binding configurations</td>
    </tr>
    <tr>
      <td>bindingsharedconnections</td>
      <td>false</td>
      <td style="text-align: center">No</td>
      <td>Set to <code class="highlighter-rouge">true</code> to share connections between item binding configurations</td>
    </tr>
    <tr>
      <td>directionssharedconnections</td>
      <td>true</td>
      <td style="text-align: center">No</td>
      <td>Set to <code class="highlighter-rouge">false</code> to not share connections between inbound and outbound connections</td>
    </tr>
  </tbody>
</table>

<h2 id="item-configuration">Item Configuration</h2>

<p>The syntax for the TCP &amp; UDP binding configuration string is explained here:</p>

<p><strong>Note:</strong> The examples here below are for the TCP protocol. UDP binding configuration are exactly the same, one only has to substitute <code class="highlighter-rouge">"tcp="</code> with <code class="highlighter-rouge">"udp="</code></p>

<p>The format of the binding configuration is simple and looks like this:</p>

<div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>tcp="&lt;direction&gt;[&lt;command&gt;:&lt;ip address&gt;:&lt;port&gt;:&lt;transformationrule&gt;], &lt;direction&gt;[&lt;command&gt;:&lt;ip address&gt;:&lt;port&gt;:&lt;transformationrule&gt;], ..."
</code></pre></div></div>

<p>where <code class="highlighter-rouge">&lt;direction&gt;</code> is one of the following values:</p>

<ul>
  <li><code class="highlighter-rouge">&lt;</code> for inbound-triggered communication, whereby the openHAB runtime will act as a server and listen for incoming connections from the specified <code class="highlighter-rouge">&lt;ip address&gt;:&lt;port&gt;</code></li>
  <li><code class="highlighter-rouge">&gt;</code> for outbound-triggered communication, whereby the openHAB runtime will act as a client and establish an outbound connection to the specified <code class="highlighter-rouge">&lt;ip address&gt;:&lt;port&gt;</code></li>
</ul>

<p><code class="highlighter-rouge">&lt;command&gt;</code> is the openHAB command. For String items, <code class="highlighter-rouge">&lt;command&gt;:</code> can be omitted.</p>

<p><code class="highlighter-rouge">&lt;ip address&gt;</code> is the hostname or IP address in dotted notation of the remote host.</p>

<p><code class="highlighter-rouge">&lt;transformationrule&gt;</code> can be one of:</p>

<ul>
  <li>a string in the form of <code class="highlighter-rouge">TEXT1(TEXT2)</code>, and then it goes through the transformation <code class="highlighter-rouge">TEXT1</code> with the argument <code class="highlighter-rouge">TEXT2</code>;</li>
  <li>empty or the string <code class="highlighter-rouge">default</code>, and then it returns the State or the Command as a String;</li>
  <li>anything else and it sends back the <code class="highlighter-rouge">&lt;transformationrule&gt;</code> string itself.</li>
</ul>

<blockquote>
  <p>:warning: The <code class="highlighter-rouge">&lt;transformationrule&gt;</code> field will be stripped of its single quotes if they are present; this means that in any case, <code class="highlighter-rouge">'TEXT'</code> is treated the same way as <code class="highlighter-rouge">TEXT</code>.</p>
</blockquote>

<h2 id="examples">Examples</h2>

<p>Here are some examples of valid binding configuration strings:</p>

<div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>tcp="&gt;[ON:192.168.0.1:3000:'MAP(my.device.map)')], &gt;[OFF:192.168.0.1:3000:'MAP(my.device.map)']" // for a Switch Item where values are converted using the my.device.map
tcp="&lt;[192.168.0.2:3000:'REGEX((.*))']" // for a String Item that captures some state of a remote device that connects to openHAB
</code></pre></div></div>

    </div>
  </div>
</section>






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