https://devzone.nordicsemi.com/f/nordic-q-a/77110/central-address-resolution-characteristicHi there! According to the Bluetooth specification (Version 5.2, Vol 3, Part C, 12 GAP service and characteristics for GATT server) the &#39;Central Address Resolution&#39; characteristic (0x2AA6) is optional for the a Peripheral device: However, even usingen-USTelligent Community 13Tue, 06 Jul 2021 09:01:51 GMThttps://devzone.nordicsemi.com/thread/318742?ContentTypeID=1Tue, 06 Jul 2021 09:01:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bda3b985-fc1c-4e66-8769-1dc3468623c0Mario Amigot<p>Ok, I found the solution:</p> <p>Including this code:</p> <p style="padding-left:30px;">ble_cfg_t ble_cfg;</p> <p style="padding-left:30px;">ble_cfg.gap_cfg.car_include_cfg.include_cfg = BLE_GAP_CHAR_INCL_CONFIG_EXCLUDE_WITHOUT_SPACE;</p> <p style="padding-left:30px;">sd_ble_cfg_set(BLE_GAP_CFG_CAR_INCL_CONFIG, &amp;ble_cfg, ram_start);</p> <p>before calling:</p> <p style="padding-left:30px;">sd_ble_enable(&amp;ram_start);</p> <p>CAR characteristic does not appear under Generic Access anymore.</p><div style="clear:both;"></div>