[nrfconnect] Fix BLE random static address generation (project-chip#13218)

Author: Damian-Nordic

config/nrfconnect/app/overlay-bt_private_addresses.conf

@@ -30,11 +30,6 @@ if (EXISTS boards/${BOARD}.conf)
   list(APPEND CONF_FILE boards/${BOARD}.conf)
 endif()
 
-# TODO: temporary fix to remove after solving static addressing problem on nrf5340
-if(BOARD STREQUAL "nrf5340dk_nrf5340_cpuapp")
-    list(INSERT OVERLAY_CONFIG 0 ${CHIP_ROOT}/config/nrfconnect/app/overlay-bt_private_addresses.conf)
-endif()
-
 option(BUILD_WITH_DFU "Build target with Device Firmware Upgrade support" OFF)
 if(BUILD_WITH_DFU)
     list(INSERT OVERLAY_CONFIG 0 ${CHIP_ROOT}/config/nrfconnect/app/overlay-ota_requestor.conf)

examples/lighting-app/nrfconnect/CMakeLists.txt

@@ -29,11 +29,6 @@ if (EXISTS boards/${BOARD}.conf)
   list(APPEND CONF_FILE boards/${BOARD}.conf)
 endif()
 
-# TODO: temporary fix to remove after solving static addressing problem on nrf5340
-if(${BOARD} STREQUAL "nrf5340dk_nrf5340_cpuapp")
-    list(INSERT OVERLAY_CONFIG 0 ${CHIP_ROOT}/config/nrfconnect/app/overlay-bt_private_addresses.conf)
-endif()
-
 option(BUILD_WITH_DFU "Build target with Device Firmware Upgrade support" OFF)
 if(BUILD_WITH_DFU)
     if(${BOARD} STREQUAL "nrf5340dk_nrf5340_cpuapp")

examples/lock-app/nrfconnect/CMakeLists.txt

@@ -29,11 +29,6 @@ if (EXISTS boards/${BOARD}.conf)
   list(APPEND CONF_FILE boards/${BOARD}.conf)
 endif()
 
-# TODO: temporary fix to remove after solving static addressing problem on nrf5340
-if(${BOARD} STREQUAL "nrf5340dk_nrf5340_cpuapp")
-    list(INSERT OVERLAY_CONFIG 0 ${CHIP_ROOT}/config/nrfconnect/app/overlay-bt_private_addresses.conf)
-endif()
-
 option(BUILD_WITH_DFU "Build target with Device Firmware Upgrade support" OFF)
 if(BUILD_WITH_DFU)
     if(${BOARD} STREQUAL "nrf5340dk_nrf5340_cpuapp")

examples/pump-app/nrfconnect/CMakeLists.txt

@@ -29,11 +29,6 @@ if (EXISTS boards/${BOARD}.conf)
   list(APPEND CONF_FILE boards/${BOARD}.conf)
 endif()
 
-# TODO: temporary fix to remove after solving static addressing problem on nrf5340
-if(${BOARD} STREQUAL "nrf5340dk_nrf5340_cpuapp")
-    list(INSERT OVERLAY_CONFIG 0 ${CHIP_ROOT}/config/nrfconnect/app/overlay-bt_private_addresses.conf)
-endif()
-
 option(BUILD_WITH_DFU "Build target with Device Firmware Upgrade support" OFF)
 if(BUILD_WITH_DFU)
     if(${BOARD} STREQUAL "nrf5340dk_nrf5340_cpuapp")

examples/pump-controller-app/nrfconnect/CMakeLists.txt

@@ -35,6 +35,7 @@
 #include <bluetooth/addr.h>
 #include <bluetooth/gatt.h>
 #include <logging/log.h>
+#include <random/rand32.h>
 #include <sys/byteorder.h>
 #include <sys/util.h>
 
@@ -85,22 +86,40 @@ struct bt_gatt_service sChipoBleService = BT_GATT_SERVICE(sChipoBleAttributes);
 // This value should be adjusted accordingly if the service declaration changes.
 constexpr int kCHIPoBLE_CCC_AttributeIndex = 3;
 
-void InitRandomStaticAddress()
+CHIP_ERROR InitRandomStaticAddress()
 {
-#if !CONFIG_BT_PRIVACY
-    // When the BT privacy feature is disabled, generate a random static address once per boot.
-    // This must be done before bt_enable() has been called.
+    // Generate a random static address for the default identity.
+    // This must be done before bt_enable() as after that updating the default identity is not possible.
+    int error = 0;
     bt_addr_le_t addr;
 
-    int error = bt_addr_le_create_static(&addr);
-    VerifyOrReturn(error == 0, ChipLogError(DeviceLayer, "Failed to create BLE address: %d", error));
+#if CONFIG_BT_HOST_CRYPTO
+    // When CONFIG_BT_HOST_CRYPTO is enabled, bt_addr_le_create_static() depends on HCI transport
+    // which is not yet started at this point, so use a different method for generating the address
+    addr.type = BT_ADDR_LE_RANDOM;
+    error     = sys_csrand_get(addr.a.val, sizeof(addr.a.val));
+    BT_ADDR_SET_STATIC(&addr.a);
+#else
+    error = bt_addr_le_create_static(&addr);
+#endif
+
+    if (error)
+    {
+        ChipLogError(DeviceLayer, "Failed to create BLE address: %d", error);
+        return System::MapErrorZephyr(error);
+    }
 
     error = bt_id_create(&addr, nullptr);
-    VerifyOrReturn(error == 0, ChipLogError(DeviceLayer, "Failed to create BLE identity: %d", error));
 
-    ChipLogProgress(DeviceLayer, "BLE address was set to %02X:%02X:%02X:%02X:%02X:%02X", addr.a.val[5], addr.a.val[4],
-                    addr.a.val[3], addr.a.val[2], addr.a.val[1], addr.a.val[0]);
-#endif
+    if (error)
+    {
+        ChipLogError(DeviceLayer, "Failed to create BLE identity: %d", error);
+        return System::MapErrorZephyr(error);
+    }
+
+    ChipLogProgress(DeviceLayer, "BLE address: %02X:%02X:%02X:%02X:%02X:%02X", addr.a.val[5], addr.a.val[4], addr.a.val[3],
+                    addr.a.val[2], addr.a.val[1], addr.a.val[0]);
+    return CHIP_NO_ERROR;
 }
 
 } // unnamed namespace
@@ -116,7 +135,7 @@ CHIP_ERROR BLEManagerImpl::_Init()
 
     memset(mSubscribedConns, 0, sizeof(mSubscribedConns));
 
-    InitRandomStaticAddress();
+    ReturnErrorOnFailure(InitRandomStaticAddress());
     int err = bt_enable(NULL);
     VerifyOrReturnError(err == 0, MapErrorZephyr(err));