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| <div class="section" id="using-the-oic-framework"> |
| <h1>Using the OIC Framework<a class="headerlink" href="#using-the-oic-framework" title="Permalink to this headline">¶</a></h1> |
| <p>Apache Mynewt includes support for the OIC interoperability standard |
| through the <code class="docutils literal notranslate"><span class="pre">oicmgr</span></code> framework. Mynewt defines and exposes oicmgr as |
| an OIC Server resource with the following identity and properties:</p> |
| <table style="width:50%" align="center"><tr><td><p><strong>URI</strong></p> |
| </td><td><p>/omgr</p> |
| </td></tr><tr><td><p><strong>Resource Type</strong>(rt)</p> |
| </td><td><p>x.mynewt.nmgr</p> |
| </td></tr><td><p><strong>Interface</strong>(if)</p> |
| </td><td><p>oic.if_rw (default), oic.if.baseline</p> |
| </td></tr><td><p><strong>Discoverable</strong></p> |
| </td><td><p>Yes</p> |
| </td></tr></table><p>The newtmgr application tool uses CoAP (Constrained ApplicationProtocol) requests to send commands to oicmgr. |
| It sends a CoAP request for <strong>/omgr</strong> as follows:</p> |
| <ul class="simple"> |
| <li><p>Specifies the newtmgr command to execute in the URI query string.</p></li> |
| <li><p>Initially the GET method was used for newtmgr commands that retreive information from |
| your application, for example, the <code class="docutils literal notranslate"><span class="pre">taskstat</span></code> and <code class="docutils literal notranslate"><span class="pre">mpstat</span></code> |
| commands. Now it uses the PUT operation as described below..</p></li> |
| <li><p>Uses a PUT method for newtmgr commands that send data to or modify |
| the state of your application, for example, the <code class="docutils literal notranslate"><span class="pre">echo</span></code> or |
| <code class="docutils literal notranslate"><span class="pre">datetime</span></code> commands.</p></li> |
| <li><p>Sends the CBOR-encoded command request data in the CoAP message |
| payload.</p></li> |
| </ul> |
| <p>The <code class="docutils literal notranslate"><span class="pre">oicmgr</span></code> framework supports transport over BLE, serial, and IP |
| connections to the device.</p> |
| <div class="section" id="newtmgr-protocol-specifics"> |
| <h2>NewtMgr Protocol Specifics<a class="headerlink" href="#newtmgr-protocol-specifics" title="Permalink to this headline">¶</a></h2> |
| <div class="section" id="requests"> |
| <h3>Requests<a class="headerlink" href="#requests" title="Permalink to this headline">¶</a></h3> |
| <ol class="arabic simple"> |
| <li><p>The NMP op is indicated by the OIC op. The OIC op is always the same: put.</p></li> |
| <li><p>There are no URI Query CoAP options.</p></li> |
| <li><p>The NMP header is included in the payload as a key-value pair (key=”_h”). This pair is in the root map of the request and is a sibling of the other request fields. The value of this pair is the big-endian eight-byte NMP header with a length field of 0.</p></li> |
| </ol> |
| </div> |
| <div class="section" id="responses"> |
| <h3>Responses<a class="headerlink" href="#responses" title="Permalink to this headline">¶</a></h3> |
| <ol class="arabic simple"> |
| <li><p>As with requests, the NMP header is included in the payload as a key-value pair (key=”_h”).</p></li> |
| <li><p>There is no “r” or “w” field. The response fields are inserted into the root map as a sibling of the “_h” pair.</p></li> |
| <li><p>Errors encountered during processing of NMP requests are reported identically to other NMP responses (embedded NMP response).</p></li> |
| </ol> |
| </div> |
| <div class="section" id="notes"> |
| <h3>Notes<a class="headerlink" href="#notes" title="Permalink to this headline">¶</a></h3> |
| <p>Keys that start with an underscore are reserved to the OIC manager protocol (e.g., “_h”). NMP requests and responses must not name any of their fields with a leading underscore.</p> |
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