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<h1 id="amazon-dash-button-binding">Amazon Dash Button Binding</h1>
<p>The <a href="https://www.amazon.com/Dash-Buttons/b?node=10667898011">Amazon Dash Button</a> is a cheap and small Wi-Fi connected device to order products from Amazon with the simple press of a button.
This Binding allows you to integrate Dash Buttons into your home automation setup.</p>
<p>The Binding code is inspired by <a href="https://github.com/hortinstein/node-dash-button">hortinstein/node-dash-button</a>.</p>
<p><strong>Warning:</strong>
The Dash Button will try to contact the Amazon servers every time the button is pressed.
This might not be in line with your privacy preferences but can be prevented.
Please refer to the <a href="#no-phonehome">“Preventing Communication with Amazon Servers”</a> section for details.</p>
<p><strong>Response Time:</strong>
Please be aware, that due to the operation method of this binding, the response time for a button press can be rather high (up to five seconds).
You might want to keep that in mind during product selection or task assignment.</p>
<h2 id="prerequisites">Prerequisites</h2>
<p>The Binding uses <a href="https://www.pcap4j.org/">Pcap4J</a> in order to capture <code class="highlighter-rouge">ARP</code> and <code class="highlighter-rouge">BOOTP</code> requests send by the Amazon Dash Button.
Buttons will hence only be usable within the same network as your openHAB instance.</p>
<p>Start with installing libpcap (for Mac/Linux/UNIX) or WinPcap (for Windows) on your computer.
They are native libraries that power the core functionalities of Pcap4J.</p>
<p><strong>Note:</strong>
Pcap4J needs administrator/root privileges.
Instructions for Debian/Ubuntu are given below.</p>
<h3 id="installing-libpcap-on-debianubuntu">Installing libpcap on Debian/Ubuntu</h3>
<p>Installing <a href="http://www.tcpdump.org/">libpcap</a> should be as simple as:</p>
<div class="language-shell highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">sudo </span>apt-get install libpcap-dev
</code></pre></div></div>
<p>You can run Pcap4J with a non-root openHAB user by granting capabilities <code class="highlighter-rouge">CAP_NET_RAW</code> and <code class="highlighter-rouge">CAP_NET_ADMIN</code> to the openHAB java environment by the following command:</p>
<div class="language-shell highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">sudo </span>setcap cap_net_raw,cap_net_admin<span class="o">=</span>eip <span class="k">$(</span>realpath /usr/bin/java<span class="k">)</span>
</code></pre></div></div>
<p>Be aware of other capabilities which were previously set by setcap.
<strong>These capabilities will be overwritten!</strong>
You can see which capabilities have already been set with the command:</p>
<div class="language-shell highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">sudo </span>getcap <span class="k">$(</span>realpath /usr/bin/java<span class="k">)</span>
</code></pre></div></div>
<p>If you need mulitple capabilities (like “cap_net_bind_service” for the Network binding), you have to add them like this:</p>
<div class="language-shell highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">sudo </span>setcap <span class="s1">'cap_net_raw,cap_net_admin=+eip cap_net_bind_service=+ep'</span> <span class="k">$(</span>realpath /usr/bin/java<span class="k">)</span>
</code></pre></div></div>
<h3 id="installing-winpcap-on-windows">Installing WinPcap on Windows</h3>
<p>On a Windows system there are two options to go with.</p>
<ol>
<li>The preferred solution is <a href="https://www.winpcap.org">WinPcap</a> if your network interface is supported.</li>
<li>An alternative option is <a href="https://github.com/nmap/npcap">npcap</a> with the settings “WinPcap 4.1.3 compatibility” and “Raw 802.11 Packet Capture”</li>
</ol>
<h3 id="installing-libpcap-on-other-operating-systems">Installing libpcap on Other Operating Systems</h3>
<p>The installation methods might differ.
A few known operating systems are:</p>
<table>
<thead>
<tr>
<th style="text-align: left">Operating System</th>
<th style="text-align: left">Command</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align: left">CentOS</td>
<td style="text-align: left"><code class="highlighter-rouge">yum install libpcap-devel</code></td>
</tr>
<tr>
<td style="text-align: left">Mac</td>
<td style="text-align: left"><code class="highlighter-rouge">brew install libpcap</code></td>
</tr>
</tbody>
</table>
<h2 id="setup-dash-button">Setup Dash Button</h2>
<p>Setting up your Dash Button is as simple as following the instructions provided by <a href="https://www.amazon.com/Dash-Buttons/b?node=10667898011">Amazon</a> <strong>EXCEPT FOR THE LAST STEP</strong>.
Follow the instructions to set up the Dash Button in their mobile app.
When you get to the step where it asks you to pick which product you want to map it to, just quit the setup process.</p>
<h2 id="no-phonehome">Preventing Communication with Amazon Servers</h2>
<p>Every time a Dash Button is pressed a request will be sent to the Amazon servers.
If no product was configured for the Button, a notification will be presented by the Amazon app on your smartphone.</p>
<p>To prevent the Dash Button from contacting the Amazon Servers, block Internet access for the device.
Please refer to the documentation of your network’ ’
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