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<h2 id="ble-eddystone">BLE Eddystone</h2>
<p><br></p>
<h3 id="eddystone-beacon-protocol">Eddystone Beacon Protocol</h3>
<p>A beaconing device announces its presence to the world by broadcasting
advertisements. The Eddystone protocol is built on top of the standard BLE
advertisement specification. Eddystone supports multiple data packet types</p>
<ul>
<li>Eddystone-UID: a unique, static ID with a 10-byte Namespace component and a 6-byte Instance component.</li>
<li>Eddystone-URL: a compressed URL that, once parsed and decompressed, is directly usable by the client.</li>
<li>Eddystone-TLM: "telemetry" packets that are broadcast alongside the Eddystone-UID or Eddystone-URL packets and contains beacon’s “health status” (e.g., battery life).</li>
<li>Eddystone-EID to broadcast an ephemeral identifier that changes every few minutes and allow only parties that can resolve the identifier to use the beacon. </li>
</ul>
<p><a href="https://developers.google.com/beacons/eddystone">This page</a> describes the Eddystone open beacon format developed by Google.</p>
<p>Apache Mynewt currently supports Eddystone-UID and Eddystone-URL formats only. This tutorial will explain how to get an Eddystone-URL beacon going on a peripheral device.</p>
<p><br></p>
<h3 id="configuration">Configuration</h3>
<p>Use the following function to configure your NimBLE device to send Eddystone-URL beacons:</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">int</span>
<span style="color: #000000">ble_eddystone_set_adv_data_url</span>(<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_hs_adv_fields</span> <span style="color: #000000">*adv_fields</span>,
<span style="color: #A90D91">uint8_t</span> <span style="color: #000000">url_scheme</span>, <span style="color: #A90D91">char</span> <span style="color: #000000">*url_body</span>,
<span style="color: #A90D91">uint8_t</span> <span style="color: #000000">url_body_len</span>, <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">url_suffix</span>)
</code></pre></div>
<p>This function's parameters are documented below.</p>
<table>
<thead>
<tr>
<th><em>Parameter</em></th>
<th><em>Purpose</em></th>
</tr>
</thead>
<tbody>
<tr>
<td>adv_fields</td>
<td>The base advertisement fields to transform into an eddystone beacon.</td>
</tr>
<tr>
<td>url_scheme</td>
<td>The prefix of the URL; one of the BLE_EDDYSTONE_URL_SCHEME values from ble_eddystone.h</td>
</tr>
<tr>
<td>url_body</td>
<td>The middle of the url specified within "".</td>
</tr>
<tr>
<td>url_body_len</td>
<td>The string length of the url_body argument.</td>
</tr>
<tr>
<td>url_suffix</td>
<td>The suffix of the URL; one of the BLE_EDDYSTONE_URL_SUFFIX values from ble_eddystone.h</td>
</tr>
</tbody>
</table>
<p><br></p>
<h3 id="modify-bleprph">Modify bleprph</h3>
<p>To demonstrate how the above function is used, we will now modify the <em>bleprph</em>
example application to send Eddystone beacons. For some background behind the <em>bleprph</em>
app, we recommend you take a look at the <a href="bleprph/bleprph-intro/">bleprph project
tutorial</a>. If you plan on making these modifications
yourself, it might be a good idea to copy <em>bleprph</em> to your local repository
and work with the copy. In general, you should avoid changing a package that
newt downloads, as you will lose your changes the next time you upgrade the
package.</p>
<p><em>bleprph</em> sets its advertisement data and begins advertising as follows (<em>main.c</em>):</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">static</span> <span style="color: #A90D91">void</span>
<span style="color: #000000">bleprph_advertise</span>(<span style="color: #A90D91">void</span>)
{
<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_gap_adv_params</span> <span style="color: #000000">adv_params</span>;
<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_hs_adv_fields</span> <span style="color: #000000">fields</span>;
<span style="color: #A90D91">const</span> <span style="color: #A90D91">char</span> <span style="color: #000000">*name</span>;
<span style="color: #A90D91">int</span> <span style="color: #000000">rc</span>;
<span style="color: #177500">/**</span>
<span style="color: #177500"> * Set the advertisement data included in our advertisements:</span>
<span style="color: #177500"> * o Flags (indicates advertisement type and other general info).</span>
<span style="color: #177500"> * o Advertising tx power.</span>
<span style="color: #177500"> * o Device name.</span>
<span style="color: #177500"> * o 16-bit service UUIDs (alert notifications).</span>
<span style="color: #177500"> */</span>
<span style="color: #000000">memset</span>(<span style="color: #000000">&amp;fields</span>, <span style="color: #1C01CE">0</span>, <span style="color: #A90D91">sizeof</span> <span style="color: #000000">fields</span>);
<span style="color: #177500">/* Advertise two flags:</span>
<span style="color: #177500"> * o Discoverability in forthcoming advertisement (general)</span>
<span style="color: #177500"> * o BLE-only (BR/EDR unsupported).</span>
<span style="color: #177500"> */</span>
<span style="color: #000000">fields</span>.<span style="color: #000000">flags</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_HS_ADV_F_DISC_GEN</span> <span style="color: #000000">|</span>
<span style="color: #000000">BLE_HS_ADV_F_BREDR_UNSUP</span>;
<span style="color: #177500">/* Indicate that the TX power level field should be included; have the</span>
<span style="color: #177500"> * stack fill this value automatically. This is done by assiging the</span>
<span style="color: #177500"> * special value BLE_HS_ADV_TX_PWR_LVL_AUTO.</span>
<span style="color: #177500"> */</span>
<span style="color: #000000">fields</span>.<span style="color: #000000">tx_pwr_lvl_is_present</span> <span style="color: #000000">=</span> <span style="color: #1C01CE">1</span>;
<span style="color: #000000">fields</span>.<span style="color: #000000">tx_pwr_lvl</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_HS_ADV_TX_PWR_LVL_AUTO</span>;
<span style="color: #000000">name</span> <span style="color: #000000">=</span> <span style="color: #000000">ble_svc_gap_device_name</span>();
<span style="color: #000000">fields</span>.<span style="color: #000000">name</span> <span style="color: #000000">=</span> (<span style="color: #A90D91">uint8_t</span> <span style="color: #000000">*</span>)<span style="color: #000000">name</span>;
<span style="color: #000000">fields</span>.<span style="color: #000000">name_len</span> <span style="color: #000000">=</span> <span style="color: #000000">strlen</span>(<span style="color: #000000">name</span>);
<span style="color: #000000">fields</span>.<span style="color: #000000">name_is_complete</span> <span style="color: #000000">=</span> <span style="color: #1C01CE">1</span>;
<span style="color: #000000">fields</span>.<span style="color: #000000">uuids16</span> <span style="color: #000000">=</span> (<span style="color: #000000">ble_uuid16_t</span>[]){
<span style="color: #000000">BLE_UUID16_INIT</span>(<span style="color: #000000">GATT_SVR_SVC_ALERT_UUID</span>)
};
<span style="color: #000000">fields</span>.<span style="color: #000000">num_uuids16</span> <span style="color: #000000">=</span> <span style="color: #1C01CE">1</span>;
<span style="color: #000000">fields</span>.<span style="color: #000000">uuids16_is_complete</span> <span style="color: #000000">=</span> <span style="color: #1C01CE">1</span>;
<span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">ble_gap_adv_set_fields</span>(<span style="color: #000000">&amp;fields</span>);
<span style="color: #A90D91">if</span> (<span style="color: #000000">rc</span> <span style="color: #000000">!=</span> <span style="color: #1C01CE">0</span>) {
<span style="color: #000000">BLEPRPH_LOG</span>(<span style="color: #000000">ERROR</span>, <span style="color: #C41A16">&quot;error setting advertisement data; rc=%d\n&quot;</span>, <span style="color: #000000">rc</span>);
<span style="color: #A90D91">return</span>;
}
<span style="color: #177500">/* Begin advertising. */</span>
<span style="color: #000000">memset</span>(<span style="color: #000000">&amp;adv_params</span>, <span style="color: #1C01CE">0</span>, <span style="color: #A90D91">sizeof</span> <span style="color: #000000">adv_params</span>);
<span style="color: #000000">adv_params</span>.<span style="color: #000000">conn_mode</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GAP_CONN_MODE_UND</span>;
<span style="color: #000000">adv_params</span>.<span style="color: #000000">disc_mode</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GAP_DISC_MODE_GEN</span>;
<span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">ble_gap_adv_start</span>(<span style="color: #000000">BLE_OWN_ADDR_PUBLIC</span>, <span style="color: #A90D91">NULL</span>, <span style="color: #000000">BLE_HS_FOREVER</span>,
<span style="color: #000000">&amp;adv_params</span>, <span style="color: #000000">bleprph_gap_event</span>, <span style="color: #A90D91">NULL</span>);
<span style="color: #A90D91">if</span> (<span style="color: #000000">rc</span> <span style="color: #000000">!=</span> <span style="color: #1C01CE">0</span>) {
<span style="color: #000000">BLEPRPH_LOG</span>(<span style="color: #000000">ERROR</span>, <span style="color: #C41A16">&quot;error enabling advertisement; rc=%d\n&quot;</span>, <span style="color: #000000">rc</span>);
<span style="color: #A90D91">return</span>;
}
}
</code></pre></div>
<p>The call to <code>ble_gap_adv_set_fields()</code> configures the device with normal
(non-Eddystone) advertisements; the call to <code>ble_gap_adv_start()</code> tells the
NimBLE stack to start broadcasting. We are now going to create an Eddystone app
by making the following changes:</p>
<ul>
<li>Call <code>ble_eddystone_set_adv_data()</code> instead of <code>ble_gap_adv_set_fields()</code>. The tutorial shows how to emit "`https://mynewt.apache.org".</li>
<li>Remove advertisement data such as device name, flags, tx levels etc. that are not required. </li>
<li>Remove unnecessary local variables e.g. <code>name</code> pointer. </li>
<li>Modify the call to <code>ble_gap_adv_start()</code> such that the device is non-discoverable and non-connectable.</li>
</ul>
<p><br></p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">static</span> <span style="color: #A90D91">void</span>
<span style="color: #000000">bleprph_advertise</span>(<span style="color: #A90D91">void</span>)
{
<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_gap_adv_params</span> <span style="color: #000000">adv_params</span>;
<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_hs_adv_fields</span> <span style="color: #000000">fields</span>;
<span style="color: #A90D91">int</span> <span style="color: #000000">rc</span>;
<span style="color: #177500">/** </span>
<span style="background-color: #ffffcc"><span style="color: #177500"> * Remove the advertisement data typically included in our advertisements: </span>
</span><span style="color: #177500"> * o Flags (indicates advertisement type and other general info).</span>
<span style="color: #177500"> * o Advertising tx power.</span>
<span style="color: #177500"> * o Device name.</span>
<span style="color: #177500"> * o 16-bit service UUIDs (alert notifications).</span>
<span style="color: #177500"> */</span>
<span style="color: #000000">memset</span>(<span style="color: #000000">&amp;fields</span>, <span style="color: #1C01CE">0</span>, <span style="color: #A90D91">sizeof</span> <span style="color: #000000">fields</span>);
<span style="background-color: #ffffcc"> <span style="color: #177500">/* No flags are needed for Eddystone URL. Remove all from default app.*/</span>
</span>
<span style="background-color: #ffffcc"> <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">ble_eddystone_set_adv_data_url</span>(<span style="color: #000000">&amp;fields</span>, <span style="color: #000000">BLE_EDDYSTONE_URL_SCHEME_HTTPS</span>, <span style="color: #C41A16">&quot;mynewt.apache&quot;</span>,
</span> <span style="color: #1C01CE">13</span>, <span style="color: #000000">BLE_EDDYSTONE_URL_SUFFIX_ORG</span>);
<span style="color: #A90D91">if</span> (<span style="color: #000000">rc</span> <span style="color: #000000">!=</span> <span style="color: #1C01CE">0</span>) {
<span style="color: #000000">BLEPRPH_LOG</span>(<span style="color: #000000">ERROR</span>, <span style="color: #C41A16">&quot;error setting eddystone advertisement data; rc=%d\n&quot;</span>, <span style="color: #000000">rc</span>);
<span style="color: #A90D91">return</span>;
}
<span style="color: #177500">/* Begin advertising. */</span>
<span style="color: #000000">memset</span>(<span style="color: #000000">&amp;adv_params</span>, <span style="color: #1C01CE">0</span>, <span style="color: #A90D91">sizeof</span> <span style="color: #000000">adv_params</span>);
<span style="background-color: #ffffcc"> <span style="color: #000000">adv_params</span>.<span style="color: #000000">conn_mode</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GAP_CONN_MODE_NON</span>;
</span><span style="background-color: #ffffcc"> <span style="color: #000000">adv_params</span>.<span style="color: #000000">disc_mode</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GAP_DISC_MODE_NON</span>;
</span> <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">ble_gap_adv_start</span>(<span style="color: #000000">BLE_OWN_ADDR_PUBLIC</span>, <span style="color: #A90D91">NULL</span>, <span style="color: #000000">BLE_HS_FOREVER</span>,
<span style="color: #000000">&amp;adv_params</span>, <span style="color: #000000">bleprph_gap_event</span>, <span style="color: #A90D91">NULL</span>);
<span style="color: #A90D91">if</span> (<span style="color: #000000">rc</span> <span style="color: #000000">!=</span> <span style="color: #1C01CE">0</span>) {
<span style="color: #000000">BLEPRPH_LOG</span>(<span style="color: #000000">ERROR</span>, <span style="color: #C41A16">&quot;error enabling advertisement; rc=%d\n&quot;</span>, <span style="color: #000000">rc</span>);
<span style="color: #A90D91">return</span>;
}
}
</code></pre></div>
<p>Also include the header file for the eddystone beacon <code>ble_eddystone.h</code> in the app's main.c file. </p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #633820">#include</span> <span style="color: #177500">&quot;host/ble_eddystone.h&quot;</span>
</code></pre></div>
<p>If you have copied the bleprph app into your local repository then make sure that the pkg.yml for the app has the <code>@apache-mynewt-core/</code> prefix; otherwise the package dependencies will not be resolved correctly.</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.deps:
- &quot;@apache-mynewt-core/boot/split&quot;
- &quot;@apache-mynewt-core/kernel/os&quot;
&lt;snip&gt;
</code></pre></div>
<p>Finally, enable the <code>BLE_EDDYSTONE</code> sysconfig in the syscfg.yml of either your target or your app.</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>syscfg.vals:
&lt;snip&gt;
BLE_EDDYSTONE: 1
</code></pre></div>
<p>Now when you run this app on your board, you should be able to see it with all
your Eddystone-aware devices.</p>
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