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| <div class="section" id="bluetooth-mesh"> |
| <h1>Bluetooth Mesh<a class="headerlink" href="#bluetooth-mesh" title="Permalink to this headline">¶</a></h1> |
| <div class="toctree-wrapper compound"> |
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| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#introduction-to-mesh" id="id1">Introduction to Mesh</a></p></li> |
| <li><p><a class="reference internal" href="#topology" id="id2">Topology</a></p></li> |
| <li><p><a class="reference internal" href="#bearers" id="id3">Bearers</a></p></li> |
| <li><p><a class="reference internal" href="#provisioning" id="id4">Provisioning</a></p></li> |
| <li><p><a class="reference internal" href="#models" id="id5">Models</a></p></li> |
| <li><p><a class="reference internal" href="#mesh-node-features-supported-by-apache-mynewt" id="id6">Mesh Node features supported by Apache Mynewt</a></p></li> |
| </ul> |
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| <div class="section" id="introduction-to-mesh"> |
| <h2><a class="toc-backref" href="#id1">Introduction to Mesh</a><a class="headerlink" href="#introduction-to-mesh" title="Permalink to this headline">¶</a></h2> |
| <p>Bluetooth Mesh is a new standard from Bluetooth SIG that was released in 2017. It enables many-to-many device |
| communication (as opposed to point-to-point approach in BLE) and is optimised for large-scale networks like building |
| automation or sensors network. It utilizes managed flood based approach where only mains-powered nodes relay messages |
| making it very power efficient (battery powered low-power nodes that don’t relay messages can operate in mesh network for years).</p> |
| <p>Bluetooth Mesh is complementary to Bluetooth specification and requires features from 4.0 release only. This allows |
| deployment of networks using hardware already available on the market.</p> |
| </div> |
| <div class="section" id="topology"> |
| <h2><a class="toc-backref" href="#id2">Topology</a><a class="headerlink" href="#topology" title="Permalink to this headline">¶</a></h2> |
| <div class="figure align-default"> |
| <img alt="Bluetooth Mesh Topology (source: Mesh Profile Specification 1.0)" src="../../_images/mesh_topology.jpg" /> |
| </div> |
| <p>Bluetooth Mesh defines few features (roles) for devices in network. Those are:</p> |
| <ul class="simple"> |
| <li><p>Relay - receive and retransmit mesh messages over the advertising bearer to enable larger networks</p></li> |
| <li><p>Proxy - receive and retransmit mesh messages between GATT and advertising bearers.</p></li> |
| <li><p>Low Power - operate within a mesh network at significantly reduced receiver duty cycles only in conjunction with a |
| node supporting the Friend feature</p></li> |
| <li><p>Friend - the ability to help a node supporting the Low Power feature to operate by storing messages destined for those nodes</p></li> |
| </ul> |
| </div> |
| <div class="section" id="bearers"> |
| <h2><a class="toc-backref" href="#id3">Bearers</a><a class="headerlink" href="#bearers" title="Permalink to this headline">¶</a></h2> |
| <p>Mesh Profile specification allows two kinds of bearers for transmitting data:</p> |
| <ul class="simple"> |
| <li><p>Advertising Bearer</p> |
| <ul> |
| <li><p>Uses LE advertising to broadcast messages to all nodes that are listening at this time</p></li> |
| <li><p>Uses non-connectable advertising only</p></li> |
| <li><p>29 octets of network message</p></li> |
| </ul> |
| </li> |
| <li><p>GATT Bearer</p> |
| <ul> |
| <li><p>Uses LE Connections to send messages</p></li> |
| <li><p>Uses standard GATT service (one for Provisioning and one for Proxy)</p></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="section" id="provisioning"> |
| <h2><a class="toc-backref" href="#id4">Provisioning</a><a class="headerlink" href="#provisioning" title="Permalink to this headline">¶</a></h2> |
| <p>Provisioning is a process of adding an unprovisioned device to a mesh network managed by a Provisioner. A Provisioner |
| provides the unprovisioned device with provisioning data that allows it to become a mesh node (network key, current IV |
| index and unicast address). A Provisioner is typically a smart phone or other mobile computing device.</p> |
| </div> |
| <div class="section" id="models"> |
| <h2><a class="toc-backref" href="#id5">Models</a><a class="headerlink" href="#models" title="Permalink to this headline">¶</a></h2> |
| <p>Models define basic functionality of nodes on a mesh network. Mesh Profile Specification defines foundation models used |
| to configure and manage network. Mesh Model Specification includes models defininig functionality that is standard |
| across device types. Those consists of:</p> |
| <ul class="simple"> |
| <li><p>Generics - root models</p> |
| <ul> |
| <li><p>On/Off</p></li> |
| <li><p>Level</p></li> |
| <li><p>Battery Server</p></li> |
| <li><p>Location</p></li> |
| <li><p>Client Property</p></li> |
| <li><p>and others</p></li> |
| </ul> |
| </li> |
| <li><p>Sensors - defines a standard way of interfacing with sensors</p></li> |
| <li><p>Time and Scenes - defines a set of functionalities related to time and saved states on devices</p></li> |
| <li><p>Lighting - defines a set functionalities related to lighting control</p></li> |
| </ul> |
| <p>Complex models e.g. Lighting may contain other models eg Generic On/Off. The following image shows an example of Light |
| Lightness Server Model.</p> |
| <div class="figure align-default"> |
| <img alt="Light Lightness Server model (source: Mesh Model Specification 1.0)" src="../../_images/mesh_lightning_model.jpg" /> |
| </div> |
| </div> |
| <div class="section" id="mesh-node-features-supported-by-apache-mynewt"> |
| <h2><a class="toc-backref" href="#id6">Mesh Node features supported by Apache Mynewt</a><a class="headerlink" href="#mesh-node-features-supported-by-apache-mynewt" title="Permalink to this headline">¶</a></h2> |
| <ul class="simple"> |
| <li><p>Advertising and GATT bearers</p></li> |
| <li><p>PB-GATT and PB-ADV provisioning</p></li> |
| <li><p>Foundation Models (server role)</p></li> |
| <li><p>Relay support</p></li> |
| <li><p>GATT Proxy</p></li> |
| </ul> |
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