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<div id="projectname">esp-nimble-cpp
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 <span id="projectnumber">1.3.2</span>
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<div class="title">Overview </div> </div>
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<div class="textblock"><p><a class="anchor" id="md_index"></a> This is a C++ BLE library for the ESP32 that uses the NimBLE host stack instead of bluedroid. <br />
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The aim is to maintain, as much as reasonable, the original bluedroid C++ & Arduino BLE API by while adding new features <br />
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and making improvements in performance, resource use, and stability. <br />
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</p>
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<p><b>Testing shows a nearly 50% reduction in flash use and approx. 100kB less ram consumed vs the original!</b> <br />
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<em>Your results may vary</em> <br />
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<br />
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</p>
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<h1><a class="anchor" id="autotoc_md33"></a>
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What is NimBLE?</h1>
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<p>NimBLE is a completely open source Bluetooth Low Energy stack produced by <a href="https://github.com/apache/mynewt-nimble">Apache</a>. <br />
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It is more suited to resource constrained devices than bluedroid and has now been ported to the ESP32 by Espressif. <br />
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<br />
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</p>
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<h1><a class="anchor" id="autotoc_md34"></a>
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Arduino Installation</h1>
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<p><b>Arduino Library manager:</b> Go to <code>sketch</code> -> <code>Include Library</code> -> <code>Manage Libraries</code> and search for NimBLE and install. <br />
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</p>
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<p><b>Alternatively:</b> Download as .zip and extract to Arduino/libraries folder, or in Arduino IDE from Sketch menu -> Include library -> Add .Zip library. <br />
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</p>
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<p><code>#include "NimBLEDevice.h"</code> at the beginning of your sketch. <br />
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</p>
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<p>Call <code><a class="el" href="class_nim_b_l_e_device.html#a674d2e68d4ba0e3f84d7993f9da7d15b" title="Initialize the BLE environment.">NimBLEDevice::init</a></code> in <code>setup</code>.</p>
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<p>Tested and working with esp32-arduino in Arduino IDE and platform IO. <br />
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<br />
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<br />
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</p>
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<h1><a class="anchor" id="autotoc_md35"></a>
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ESP-IDF Installation</h1>
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<h3><a class="anchor" id="autotoc_md36"></a>
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v4.0+</h3>
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<p>Download as .zip and extract or clone into the components folder in your esp-idf project.</p>
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<p>Run menuconfig, go to <code>Component config->Bluetooth</code> enable Bluetooth and in <code>Bluetooth host</code> NimBLE. <br />
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Configure settings in <code>NimBLE Options</code>. <br />
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<code>#include "NimBLEDevice.h"</code> in main.cpp. <br />
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Call <code><a class="el" href="class_nim_b_l_e_device.html#a674d2e68d4ba0e3f84d7993f9da7d15b" title="Initialize the BLE environment.">NimBLEDevice::init</a></code> in <code>app_main</code>. <br />
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<br />
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</p>
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<h3><a class="anchor" id="autotoc_md37"></a>
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v3.2 & v3.3</h3>
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<p>The NimBLE component does not come with these versions of IDF (now included in 3.3.2 and above). <br />
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A backport that works in these versions has been created and is <a href="https://github.com/h2zero/esp-nimble-component">available here</a>. <br />
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Download or clone that repo into your project/components folder and run menuconfig. Configure settings in <code>main menu -> NimBLE Options</code>. <br />
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</p>
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<p><code>#include "NimBLEDevice.h"</code> in main.cpp. <br />
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Call <code><a class="el" href="class_nim_b_l_e_device.html#a674d2e68d4ba0e3f84d7993f9da7d15b" title="Initialize the BLE environment.">NimBLEDevice::init</a></code> in <code>app_main</code>. <br />
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<br />
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<br />
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</p>
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<h1><a class="anchor" id="autotoc_md38"></a>
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Using</h1>
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<p>This library is intended to be compatible with the original ESP32 BLE functions and types with minor changes. <br />
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</p>
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<p>If you have not used the original Bluedroid library please refer to the <a class="el" href="md__new_user_guide.html">New user guide</a>.</p>
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<p>If you are familiar with the original library, see: <a class="el" href="md__migration_guide.html">The migration guide</a> for details. <br />
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</p>
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<p>Also see <a class="el" href="md__improvements_and_updates.html">Improvements and updates</a> for information about non-breaking changes. <br />
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</p>
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<p>For more advanced usage see <a class="el" href="md__usage_tips.html">Usage tips</a> for more performance and optimization. <br />
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<br />
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</p>
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<h3><a class="anchor" id="autotoc_md39"></a>
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Arduino specific</h3>
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<p>See the Refactored_original_examples in the examples folder for highlights of the differences with the original library. <br />
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</p>
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<p>More advanced examples highlighting many available features are in examples/NimBLE_Server, NimBLE_Client. <br />
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</p>
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<p>Beacon examples provided by <a href="https://github.com/beegee-tokyo">beegee-tokyo</a> are in examples/BLE_Beacon_Scanner, BLE_EddystoneTLM_Beacon, BLE_EddystoneURL_Beacon. <br />
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</p>
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<p>Change the settings in the <a class="el" href="nimconfig_8h.html">nimconfig.h</a> file to customize NimBLE to your project, such as increasing max connections (default is 3). <br />
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<br />
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</p>
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<h3><a class="anchor" id="autotoc_md40"></a>
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Arduino command line and platformio</h3>
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<p>As an alternative to changing the configuration in <a class="el" href="nimconfig_8h.html">nimconfig.h</a>, Arduino command line and platformio.ini options are available. <br />
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See the command line configuration options available in <a class="el" href="md__command_line_config.html">Command line config</a>. <br />
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<br />
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<br />
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</p>
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<h1><a class="anchor" id="autotoc_md41"></a>
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Need help? Have a question or suggestion?</h1>
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<p>Come chat on <a href="https://gitter.im/NimBLE-Arduino/community?utm_source=share-link&utm_medium=link&utm_campaign=share-link">gitter</a> or open an issue at <a href="https://github.com/h2zero/NimBLE-Arduino/issues">NimBLE-Arduino</a> or <a href="https://github.com/h2zero/esp-nimble-cpp/issues">esp-nimble-cpp</a> <br />
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<br />
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</p>
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<h1><a class="anchor" id="autotoc_md42"></a>
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Acknowledgments</h1>
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<ul>
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<li><a href="https://github.com/nkolban">nkolban</a> and <a href="https://github.com/chegewara">chegewara</a> for the <a href="https://github.com/nkolban/esp32-snippets/tree/master/cpp_utils">original esp32 BLE library</a> this project was derived from.</li>
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<li><a href="https://github.com/beegee-tokyo">beegee-tokyo</a> for contributing your time to test/debug and contributing the beacon examples.</li>
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<li><a href="https://github.com/Jeroen88">Jeroen88</a> for the amazing help debugging and improving the client code. <br />
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<br />
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</li>
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</ul>
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