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| <div class="section" id="advertising"> |
| <h1>Advertising<a class="headerlink" href="#advertising" title="Permalink to this headline">¶</a></h1> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#overview" id="id1">Overview</a></p></li> |
| <li><p><a class="reference internal" href="#setting-advertisement-data" id="id2">Setting advertisement data</a></p></li> |
| <li><p><a class="reference internal" href="#begin-advertising" id="id3">Begin advertising</a></p></li> |
| </ul> |
| </div> |
| <div class="section" id="overview"> |
| <h2><a class="toc-backref" href="#id1">Overview</a><a class="headerlink" href="#overview" title="Permalink to this headline">¶</a></h2> |
| <p>A peripheral announces its presence to the world by broadcasting |
| advertisements. An advertisement typically contains additional |
| information about the peripheral sending it, such as the device name and |
| an abbreviated list of supported services. The presence of this |
| information helps a listening central to determine whether it is |
| interested in connecting to the peripheral. Advertisements are quite |
| limited in the amount of information they can contain, so only the most |
| important information should be included.</p> |
| <p>When a listening device receives an advertisement, it can choose to |
| connect to the peripheral, or query the sender for more information. |
| This second action is known as an <em>active scan</em>. A peripheral responds |
| to an active scan with some extra information that it couldn’t fit in |
| its advertisement. This additional information is known as <em>scan |
| response data</em>. <em>bleprph</em> does not configure any scan response data, so |
| this feature is not discussed in the remainder of this tutorial.</p> |
| <p><em>bleprph</em> constantly broadcasts advertisements until a central connects |
| to it. When a connection is terminated, <em>bleprph</em> resumes advertising.</p> |
| <p>Let’s take a look at <em>bleprph</em>’s advertisement code (<em>main.c</em>):</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cm">/**</span> |
| <span class="cm"> * Enables advertising with the following parameters:</span> |
| <span class="cm"> * o General discoverable mode.</span> |
| <span class="cm"> * o Undirected connectable mode.</span> |
| <span class="cm"> */</span> |
| <span class="k">static</span><span class="w"> </span><span class="kt">void</span> |
| <span class="nf">bleprph_advertise</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">ble_hs_adv_fields</span><span class="w"> </span><span class="n">fields</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rc</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="cm">/* Set the advertisement data included in our advertisements. */</span> |
| <span class="w"> </span><span class="n">memset</span><span class="p">(</span><span class="o">&</span><span class="n">fields</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="k">sizeof</span><span class="w"> </span><span class="n">fields</span><span class="p">);</span> |
| <span class="w"> </span><span class="n">fields</span><span class="p">.</span><span class="n">name</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="o">*</span><span class="p">)</span><span class="n">bleprph_device_name</span><span class="p">;</span> |
| <span class="w"> </span><span class="n">fields</span><span class="p">.</span><span class="n">name_len</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">strlen</span><span class="p">(</span><span class="n">bleprph_device_name</span><span class="p">);</span> |
| <span class="w"> </span><span class="n">fields</span><span class="p">.</span><span class="n">name_is_complete</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span> |
| <span class="w"> </span><span class="n">rc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ble_gap_adv_set_fields</span><span class="p">(</span><span class="o">&</span><span class="n">fields</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">rc</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">BLEPRPH_LOG</span><span class="p">(</span><span class="n">ERROR</span><span class="p">,</span><span class="w"> </span><span class="s">"error setting advertisement data; rc=%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">rc</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">return</span><span class="p">;</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="cm">/* Begin advertising. */</span> |
| <span class="w"> </span><span class="n">rc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ble_gap_adv_start</span><span class="p">(</span><span class="n">BLE_GAP_DISC_MODE_GEN</span><span class="p">,</span><span class="w"> </span><span class="n">BLE_GAP_CONN_MODE_UND</span><span class="p">,</span> |
| <span class="w"> </span><span class="nb">NULL</span><span class="p">,</span><span class="w"> </span><span class="mi">0</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">,</span><span class="w"> </span><span class="n">bleprph_on_connect</span><span class="p">,</span><span class="w"> </span><span class="nb">NULL</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">rc</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">BLEPRPH_LOG</span><span class="p">(</span><span class="n">ERROR</span><span class="p">,</span><span class="w"> </span><span class="s">"error enabling advertisement; rc=%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">rc</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">return</span><span class="p">;</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>Now let’s examine this code in detail.</p> |
| </div> |
| <div class="section" id="setting-advertisement-data"> |
| <h2><a class="toc-backref" href="#id2">Setting advertisement data</a><a class="headerlink" href="#setting-advertisement-data" title="Permalink to this headline">¶</a></h2> |
| <p>A NimBLE peripheral specifies what information to include in its |
| advertisements with the following function:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span> |
| <span class="n">ble_gap_adv_set_fields</span><span class="p">(</span><span class="k">struct</span><span class="w"> </span><span class="nc">ble_hs_adv_fields</span><span class="w"> </span><span class="o">*</span><span class="n">adv_fields</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>The <em>adv_fields</em> argument specifies the fields and their contents to |
| include in subsequent advertisements. The Bluetooth <a class="reference external" href="https://www.bluetooth.org/DocMan/handlers/DownloadDoc.ashx?doc_id=302735">Core Specification |
| Supplement</a> |
| defines a set of standard fields that can be included in an |
| advertisement; the member variables of the <em>struct ble_hs_adv_fields</em> |
| type correspond to these standard fields. Information that doesn’t fit |
| neatly into a standard field should be put in the <em>manufacturing |
| specific data</em> field.</p> |
| <p>As you can see in the above code listing, the |
| <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">ble_hs_adv_fields</span></code> instance is allocated on the stack. It is |
| OK to use the stack for this struct and the data it references, as the |
| <code class="docutils literal notranslate"><span class="pre">ble_gap_adv_set_fields()</span></code> function makes a copy of all the |
| advertisement data before it returns. <em>bleprph</em> doesn’t take full |
| advantange of this; it stores its device name in a static array.</p> |
| <p>The code sets three members of the <em>struct ble_hs_adv_fields</em> |
| instance:</p> |
| <ul class="simple"> |
| <li><p>name</p></li> |
| <li><p>name_len</p></li> |
| <li><p>name_is_complete</p></li> |
| </ul> |
| <p>The first two fields are used to communicate the device’s name and are |
| quite straight-forward. The third field requires some explanation. |
| Bluetooth specifies two name-related advertisement fields: <em>Shortened |
| Local Name</em> and <em>Complete Local Name</em>. Setting the <code class="docutils literal notranslate"><span class="pre">name_is_complete</span></code> |
| variable to 1 or 0 tells NimBLE which of these two fields to include in |
| advertisements. Some other advertisement fields also correspond to |
| multiple variables in the field struct, so it is a good idea to review |
| the <em>ble_hs_adv_fields</em> reference to make sure you get the details |
| right in your app.</p> |
| </div> |
| <div class="section" id="begin-advertising"> |
| <h2><a class="toc-backref" href="#id3">Begin advertising</a><a class="headerlink" href="#begin-advertising" title="Permalink to this headline">¶</a></h2> |
| <p>An app starts advertising with the following function:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span> |
| <span class="n">ble_gap_adv_start</span><span class="p">(</span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">discoverable_mode</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">connectable_mode</span><span class="p">,</span> |
| <span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="o">*</span><span class="n">peer_addr</span><span class="p">,</span><span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">peer_addr_type</span><span class="p">,</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">hci_adv_params</span><span class="w"> </span><span class="o">*</span><span class="n">adv_params</span><span class="p">,</span> |
| <span class="w"> </span><span class="n">ble_gap_conn_fn</span><span class="w"> </span><span class="o">*</span><span class="n">cb</span><span class="p">,</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">cb_arg</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>This function allows a lot of flexibility, and it might seem daunting at |
| first glance. <em>bleprph</em> specifies a simple set of arguments that is |
| appropriate for most peripherals. When getting started on a typical |
| peripheral, we recommend you use the same arguments as <em>bleprph</em>, with |
| the exception of the last two (<em>cb</em> and <em>cb_arg</em>). These last two |
| arguments will be specific to your app, so let’s talk about them.</p> |
| <p><em>cb</em> is a callback function. It gets executed when a central connects to |
| your peripheral after receiving an advertisement. The <em>cb_arg</em> argument |
| gets passed to the <em>cb</em> callback. If your callback doesn’t need the |
| <em>cb_arg</em> parameter, you can do what <em>bleprph</em> does and pass <em>NULL</em>. |
| Once a connection is established, the <em>cb</em> callback becomes permanently |
| associated with the connection. All subsequent events related to the |
| connection are communicated to your app via calls to this callback |
| function. Connection callbacks are an important part of building a BLE |
| app, and we examine <em>bleprph</em>’s connection callback in detail in the |
| next section of this tutorial.</p> |
| <p><strong>One final note:</strong> Your peripheral automatically stops advertising when |
| a central connects to it. You can immediately resume advertising if you |
| want to allow another central to connect, but you will need to do so |
| explicitly by calling <code class="docutils literal notranslate"><span class="pre">ble_gap_adv_start()</span></code> again. Also, be aware |
| NimBLE’s default configuration only allows a single connection at a |
| time. NimBLE supports multiple concurrent connections, but you must |
| configure it to do so first.</p> |
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