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| <h2 id="gatt-feature-api-for-bletiny">GATT feature API for bletiny</h2> |
| <p><br></p> |
| <p>GATT(GENERIC ATTRIBUTE PROFILE) describes a service framework using the Attribute Protocol for discovering services, and for reading and writing characteristic values on a peer device. There are 11 features defined in the GATT Profile, and each of the features is mapped to procedures and sub-procedures: </p> |
| <table> |
| <thead> |
| <tr> |
| <th><strong>Item No.</strong></th> |
| <th><strong>Feature</strong></th> |
| <th><strong>Sub-Procedure</strong></th> |
| <th><strong>nimBLE command</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>1</td> |
| <td>Server Configuration</td> |
| <td>Exchange MTU</td> |
| <td><code>b mtu</code></td> |
| </tr> |
| <tr> |
| <td>2</td> |
| <td>Primary Service Discovery</td> |
| <td>Discover All Primary Services</td> |
| <td><code>b disc svc conn=x</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Discover Primary Services By Service UUID</td> |
| <td><code>b disc svc conn=x uuid=x</code></td> |
| </tr> |
| <tr> |
| <td>3</td> |
| <td>Relationship Discovery</td> |
| <td>Find Included Services</td> |
| <td><code>b find inc_svcs conn=x start=x end=x</code></td> |
| </tr> |
| <tr> |
| <td>4</td> |
| <td>Characteristic Discovery</td> |
| <td>Discover All Characteristic of a Service</td> |
| <td><code>b disc chr conn=x start=x end=x</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Discover Characteristic by UUID</td> |
| <td><code>b disc chr conn=x start=x end=x uuid=x</code></td> |
| </tr> |
| <tr> |
| <td>5</td> |
| <td>Characteristic Descriptor Discovery</td> |
| <td>Discover All Characteristic Descriptors</td> |
| <td><code>b disc dsc conn=x start=x end=x</code></td> |
| </tr> |
| <tr> |
| <td>6</td> |
| <td>Reading a Characteristic Value</td> |
| <td>Read Characteristic Value</td> |
| <td><code>b read conn=x attr=x</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Read Using Characteristic UUID</td> |
| <td><code>b read conn=x start=x end=x uuid=x</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Read Long Characteristic Values</td> |
| <td><code>b read conn=x attr=x long=1</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Read Multiple Characteristic Values</td> |
| <td><code>b read conn=x attr=x attr=y attr=z</code></td> |
| </tr> |
| <tr> |
| <td>7</td> |
| <td>Writing a Characteristic Value</td> |
| <td>Write Without Response</td> |
| <td><code>b write conn=x value=0xXX:0xXX no_rsp=1</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Signed Write Without Response</td> |
| <td>NOT SUPPORTED</td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Write Characteristic Value</td> |
| <td><code>b write conn=x attr=x value=0xXX:0xXX</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Write Long Characteristic Values</td> |
| <td><code>b write conn=x attr=x value=0xXX:0xXX long=1</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Characteristic Value Reliable Writes</td> |
| <td><code>b write conn=x attr=x value=0xXX:0xXX attr=y value=0xYY:0xYY</code></td> |
| </tr> |
| <tr> |
| <td>8</td> |
| <td>Notification of a Characteristic Value</td> |
| <td>Notifications</td> |
| <td>Write <em>0x01:0x00</em> to CLIENT CONFIGURATION characteristic</td> |
| </tr> |
| <tr> |
| <td>9</td> |
| <td>Indication of a Characteristic Value</td> |
| <td>Indications</td> |
| <td>Write <em>0x02:0x00</em> to CLIENT CONFIGURATION characteristic</td> |
| </tr> |
| <tr> |
| <td>10</td> |
| <td>Reading a Characteristic Descriptor</td> |
| <td>Read Characteristic Descriptors</td> |
| <td><code>b read conn=x attr=x</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Read Long Characteristic Descriptors</td> |
| <td><code>b read conn=x attr=x long=1</code></td> |
| </tr> |
| <tr> |
| <td>11</td> |
| <td>Writing a Characteristic Descriptor</td> |
| <td>Write Characteristic Descriptors</td> |
| <td><code>b write conn=x value=0xXX:0xXX</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td>Write Long Characteristic Descriptors</td> |
| <td><code>b write conn=x value=0xXX:0xXX long=1</code></td> |
| </tr> |
| </tbody> |
| </table> |
| <p><br></p> |
| <h3 id="using-nimble-commands">Using NimBLE commands</h3> |
| <p>Assuming you have discovered and established a BLE connection with at least one peer device (as explained earlier in <a href="../bletiny_api/">API for bletiny app</a>, you can find out what characteristics and services are available over these connections. Here is a recap.</p> |
| <p>To show established connections:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>b show conn |
| </code></pre></div> |
| |
| <p>To show discovered services, characteristics, and descriptors:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>b show chr |
| </code></pre></div> |
| |
| <p>To show connection RSSI:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>b show rssi conn=x |
| </code></pre></div> |
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