ble_mesh: stack: Make unprovisioned beacon interval configurable.

Closes https://github.com/espressif/esp-idf/issues/6722

components/bt/esp_ble_mesh/Kconfig.in

@@ -265,6 +265,19 @@ if BLE_MESH
             advertising bearer. This option should be enabled if PB-ADV is
             going to be used during provisioning procedure.
 
+    config BLE_MESH_UNPROVISIONED_BEACON_INTERVAL
+        int "Interval between two consecutive Unprovisioned Device Beacon"
+        depends on BLE_MESH_NODE && BLE_MESH_PB_ADV
+        default 5
+        default 3 if BLE_MESH_FAST_PROV
+        range 1 100
+        help
+            This option specifies the interval of sending two consecutive unprovisioned
+            device beacon, users can use this option to change the frequency of sending
+            unprovisioned device beacon. For example, if the value is 5, it means the
+            unprovisioned device beacon will send every 5 seconds. When the option of
+            BLE_MESH_FAST_PROV is selected, the value is better to be 3 seconds, or less.
+
     config BLE_MESH_PB_GATT
         bool "Provisioning support using GATT (PB-GATT)"
         select BLE_MESH_PROXY

components/bt/esp_ble_mesh/mesh_core/beacon.c

@@ -22,11 +22,11 @@
 #include "provisioner_prov.h"
 #include "provisioner_main.h"
 
-#if defined(CONFIG_BLE_MESH_FAST_PROV)
-#define UNPROVISIONED_INTERVAL     K_SECONDS(3)
+#if defined(CONFIG_BLE_MESH_UNPROVISIONED_BEACON_INTERVAL)
+#define UNPROVISIONED_INTERVAL     K_SECONDS(CONFIG_BLE_MESH_UNPROVISIONED_BEACON_INTERVAL)
 #else
 #define UNPROVISIONED_INTERVAL     K_SECONDS(5)
-#endif /* CONFIG_BLE_MESH_FAST_PROV */
+#endif
 #define PROVISIONED_INTERVAL       K_SECONDS(10)
 
 #define BEACON_TYPE_UNPROVISIONED  0x00