feat(ble_mesh): Make alarm number configurable

components/bt/Kconfig

@@ -80,6 +80,12 @@ menu "Bluetooth"
             We cannot split the memory into 3 different regions (IRAM, BLE-IRAM, DRAM).
             So this option will disable the PMP (ESP_SYSTEM_PMP_IDRAM_SPLIT)
 
+    menu "Common Options"
+        visible if (BT_BLUEDROID_ENABLED || BT_NIMBLE_ENABLED)
+
+        source "$IDF_PATH/components/bt/common/Kconfig.in"
+    endmenu
+
 endmenu
 
 menuconfig BLE_MESH

components/bt/common/Kconfig.in

@@ -0,0 +1,6 @@
+config BT_ALARM_MAX_NUM
+    int "Maximum number of Bluetooth alarms"
+    default 50
+    help
+        This option decides the maximum number of alarms which
+        could be used by Bluetooth host.

components/bt/common/include/bt_user_config.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -50,6 +50,15 @@
 #define UC_BTC_TASK_STACK_SIZE              4096
 #endif
 
+/**********************************************************
+ * Alarm reference
+ **********************************************************/
+#ifdef CONFIG_BT_ALARM_MAX_NUM
+#define UC_ALARM_MAX_NUM                    CONFIG_BT_ALARM_MAX_NUM
+#else
+#define UC_ALARM_MAX_NUM                    50
+#endif
+
 /**********************************************************
  * Trace reference
  **********************************************************/

components/bt/common/osi/include/osi/alarm.h

@@ -21,6 +21,7 @@
 
 #include <stdint.h>
 #include "esp_timer.h"
+#include "bt_user_config.h"
 
 typedef struct alarm_t osi_alarm_t;
 typedef uint64_t period_ms_t;
@@ -33,7 +34,7 @@ typedef enum {
     OSI_ALARM_ERR_INVALID_STATE = -3,
 } osi_alarm_err_t;
 
-#define ALARM_CBS_NUM   50
+#define ALARM_CBS_NUM   UC_ALARM_MAX_NUM
 #define ALARM_ID_BASE   1000
 
 int osi_alarm_create_mux(void);