NimBLE: Add Host based privacy (RPA) feature support (v4.0)

- This feature removes dependency on controller to use privacy (RPA)

components/bt/CMakeLists.txt

@@ -464,6 +464,7 @@ if(CONFIG_BT_ENABLED)
                     "host/nimble/nimble/nimble/host/src/ble_hs_adv.c"
                     "host/nimble/nimble/nimble/host/src/ble_hs_hci.c"
                     "host/nimble/nimble/nimble/host/src/ble_hs_hci_util.c"
+                    "host/nimble/nimble/nimble/host/src/ble_hs_resolv.c"
                     "host/nimble/nimble/nimble/host/store/ram/src/ble_store_ram.c"
                     "host/nimble/nimble/nimble/host/store/config/src/ble_store_config.c"
                     "host/nimble/nimble/nimble/host/store/config/src/ble_store_nvs.c"

components/bt/host/nimble/Kconfig.in

@@ -257,6 +257,15 @@ config BT_NIMBLE_HS_FLOW_CTRL_TX_ON_DISCONNECT
         Enable this option to send number-of-completed-packets event to
         controller after disconnection
 
+config BT_NIMBLE_RPA_TIMEOUT
+    int "RPA timeout in seconds"
+    range 1 41400
+    depends on BT_NIMBLE_ENABLED
+    default 900
+    help
+        Time interval between RPA address change. This is applicable in case of
+        Host based RPA
+
 menuconfig BT_NIMBLE_MESH
     bool "Enable BLE mesh functionality"
     select BT_NIMBLE_SM_SC

components/bt/host/nimble/nimble

@@ -1 +1 @@
-Subproject commit d4ba1367c8cb093c414154f5ce9d8a3af1c0a1b1
+Subproject commit 0eb95974b6f58db017bb63330aa9654330c1301d

components/bt/host/nimble/port/include/esp_nimble_cfg.h

@@ -535,8 +535,12 @@
 #define MYNEWT_VAL_BLE_MONITOR_UART_DEV ("uart0")
 #endif
 
+#ifndef MYNEWT_VAL_BLE_HOST_BASED_PRIVACY
+#define MYNEWT_VAL_BLE_HOST_BASED_PRIVACY (1)
+#endif
+
 #ifndef MYNEWT_VAL_BLE_RPA_TIMEOUT
-#define MYNEWT_VAL_BLE_RPA_TIMEOUT (300)
+#define MYNEWT_VAL_BLE_RPA_TIMEOUT (CONFIG_BT_NIMBLE_RPA_TIMEOUT)
 #endif
 
 #ifndef MYNEWT_VAL_BLE_SM_BONDING

examples/bluetooth/nimble/bleprph/README.md

@@ -10,9 +10,11 @@ This example aims at understanding GATT database configuration, advertisement an
 
 It also demonstrates security features of NimBLE stack. SMP parameters like I/O capabilities of device, Bonding flag, MITM protection flag and Secure Connection only mode etc., can be configured through menuconfig options.
 
+For RPA feature (currently Host based privacy feature is supported), use API `ble_hs_pvcy_rpa_config` to enable/disable host based privacy, `own_addr_type` needs to be set to `BLE_ADDR_RANDOM` to use this feature. Please include `ble_hs_pvcy.h` while using this API. As `ble_hs_pvcy_rpa_config` configures host privacy and sets address in controller, it is necessary to call this API after host-controller are synced (e.g. in `bleprph_on_sync` callback).
+
 To test this demo, any BLE scanner app can be used.
 
-A Python based utility `bleprph_test.py` is also provided (which will run as a BLE GATT Client) and can be used to test this example.   
+A Python based utility `bleprph_test.py` is also provided (which will run as a BLE GATT Client) and can be used to test this example.
 
 Note :