NimBLE: Add Host based privacy (RPA) feature support

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

components/bt/CMakeLists.txt

@@ -480,6 +480,7 @@ 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 d60a322f54cdad95f842b9fabb026615745da1a3
+Subproject commit e4e2b501410bf60d2f09e62bfd8230074dfaa2c9

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

@@ -543,8 +543,12 @@
 #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.
+
 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 :