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| <h2 id="configure-an-address">Configure an Address</h2> |
| <p>A BLE device needs an address to do just about anything. For information on |
| the various types of Bluetooth addresses, see the |
| <a href="../../ble_hs/ble_hs_id/ble_hs_id/">NimBLE Host Identity Reference</a>.</p> |
| <p>There are several methods for assigning an address to a NimBLE device. The |
| available options are documented below:</p> |
| <h3 id="method-1-configure-nrf-hardware-with-a-public-address">Method 1: Configure nRF hardware with a public address</h3> |
| <p>When Mynewt is running on a Nordic nRF platform, the NimBLE controller will |
| attempt to read a public address out of the board's FICR or UICR registers. |
| The controller uses the following logic while trying to read an address from |
| hardware:</p> |
| <ol> |
| <li>If the <em>DEVICEADDRTYPE</em> FICR register is written, read the address |
| programmed in the <em>DEVICEADDR[0]</em> and <em>DEVICEADDR[1]</em> FICR registers.</li> |
| <li>Else if the upper 16 bits of the <em>CUSTOMER[1]</em> UICR register are 0, read the address programmed in the <em>CUSTOMER[0]</em> and <em>CUSTOMER[1]</em> UCI registers.</li> |
| <li>Else, no address available.</li> |
| </ol> |
| <h3 id="method-2-hardcode-a-public-address-in-the-mynewt-target">Method 2: Hardcode a public address in the Mynewt target</h3> |
| <p>The NimBLE controller package exports a |
| <a href="../../../../os/modules/sysinitconfig/sysinitconfig/">syscfg</a> setting called |
| <code>BLE_PUBLIC_DEV_ADDR</code>. This setting can be overridden at the application or |
| target level to configure a public Bluetooth address. For example, a target |
| can assign the public address <em>11:22:33:44:55:66</em> as follows:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>syscfg.vals: |
| BLE_PUBLIC_DEV_ADDR: '(uint8_t[6]){0x66, 0x55, 0x44, 0x33, 0x22, 0x11}' |
| </code></pre></div> |
| |
| <p>This setting takes the form of a C expression. Specifically, the value is a |
| designated initializer expressing a six-byte array. Also note that the bytes |
| are reversed, as an array is inherently little-endian, while addresses are |
| generally expressed in big-endian.</p> |
| <p>Note: this method takes precedence over method 1. Whatever is written to the |
| <code>BLE_PUBLIC_DEV_ADDR</code> setting is the address that gets used.</p> |
| <h3 id="method-3-configure-a-random-address-at-runtime">Method 3: Configure a random address at runtime</h3> |
| <p>Random addresses get configured through the NimBLE host. The following two |
| functions are used in random address configuration:</p> |
| <ul> |
| <li><a href="../../../network/ble/ble_hs/ble_hs_id/functions/ble_hs_id_gen_rnd/">ble_hs_id_gen_rnd</a>: Generates a new random address.</li> |
| <li><a href="../../../network/ble/ble_hs/ble_hs_id/functions/ble_hs_id_set_rnd/">ble_hs_id_set_rnd</a>: Sets the device's random address.</li> |
| </ul> |
| <p>For an example of how this is done, see the |
| <a href="../../../os/tutorials/ibeacon/">BLE iBeacon tutorial</a>.</p> |
| <p><br></p> |
| <p><em>Note:</em> A NimBLE device can be configured with multiple addresses; at most one |
| of each address type.</p> |
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