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| <div class="section" id="respond-to-sync-and-reset-events"> |
| <h1>Respond to <em>sync</em> and <em>reset</em> events<a class="headerlink" href="#respond-to-sync-and-reset-events" title="Permalink to this headline">¶</a></h1> |
| <div class="section" id="sync"> |
| <h2>sync<a class="headerlink" href="#sync" title="Permalink to this headline">¶</a></h2> |
| <p>The NimBLE stack is inoperable while the host and controller are out of |
| sync. In a combined host-controller app, the sync happens immediately at |
| startup. When the host and controller are separate, sync typically |
| occurs in under a second after the application starts. An application |
| learns when sync is achieved by configuring the host’s <em>sync callback</em>: |
| <code class="docutils literal notranslate"><span class="pre">ble_hs_cfg.sync_cb</span></code>. The host calls the sync callback whenever sync |
| is acquired. The sync callback has the following form:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">typedef</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">ble_hs_sync_fn</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>Because the NimBLE stack begins in the unsynced state, the application |
| should delay all BLE operations until the sync callback has been called.</p> |
| </div> |
| <div class="section" id="reset"> |
| <h2>reset<a class="headerlink" href="#reset" title="Permalink to this headline">¶</a></h2> |
| <p>Another event indicated by the host is a <em>controller reset</em>. The NimBLE |
| stack resets itself when a catastrophic error occurs, such as loss of |
| communication between the host and controller. Upon resetting, the host |
| drops all BLE connections and loses sync with the controller. After a |
| reset, the application should refrain from using the host until sync is |
| again signaled via the sync callback.</p> |
| <p>An application learns of a host reset by configuring the host’s <em>reset |
| callback</em>: <code class="docutils literal notranslate"><span class="pre">ble_hs_cfg.reset_cb</span></code>. This callback has the following |
| form:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">typedef</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">ble_hs_reset_fn</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">reason</span><span class="p">);</span> |
| </pre></div> |
| </div> |
| <p>The <code class="docutils literal notranslate"><span class="pre">reason</span></code> parameter is a <a class="reference internal" href="../ble_hs/ble_hs_return_codes.html"><span class="doc">NimBLE host return |
| code</span></a>.</p> |
| </div> |
| <div class="section" id="example"> |
| <h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> |
| <p>The following example demonstrates the configuration of the sync and |
| reset callbacks.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"sysinit/sysinit.h"</span> |
| <span class="cp">#include</span><span class="w"> </span><span class="cpf">"console/console.h"</span> |
| <span class="cp">#include</span><span class="w"> </span><span class="cpf">"host/ble_hs.h"</span> |
| |
| <span class="k">static</span><span class="w"> </span><span class="kt">void</span> |
| <span class="nf">on_sync</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* Begin advertising, scanning for peripherals, etc. */</span> |
| <span class="p">}</span> |
| |
| <span class="k">static</span><span class="w"> </span><span class="kt">void</span> |
| <span class="nf">on_reset</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">reason</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="n">console_printf</span><span class="p">(</span><span class="s">"Resetting state; reason=%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span><span class="w"> </span><span class="n">reason</span><span class="p">);</span> |
| <span class="p">}</span> |
| |
| <span class="kt">int</span> |
| <span class="nf">main</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* Initialize all packages. */</span> |
| <span class="w"> </span><span class="n">sysinit</span><span class="p">();</span> |
| |
| <span class="w"> </span><span class="n">ble_hs_cfg</span><span class="p">.</span><span class="n">sync_cb</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">on_sync</span><span class="p">;</span> |
| <span class="w"> </span><span class="n">ble_hs_cfg</span><span class="p">.</span><span class="n">reset_cb</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">on_reset</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="cm">/* As the last thing, process events from default event queue. */</span> |
| <span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="n">os_eventq_run</span><span class="p">(</span><span class="n">os_eventq_dflt_get</span><span class="p">());</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="p">}</span> |
| </pre></div> |
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