diff --git a/.vscode/settings.json b/.vscode/settings.json
index bfcf6e9..6029e93 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -6,6 +6,7 @@
   ],
   "idf.port": "/dev/ttyACM0",
   "idf.currentSetup": "C:\\esp\\v6.0.1\\esp-idf",
+  "idf.pythonInstallPath": "C:\\Espressif\\tools\\python\\v6.0.1\\venv\\Scripts\\python.exe",
   "idf.customExtraVars": {
     "IDF_TARGET": "esp32s3"
   },
diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 6e843d6..a86b1e8 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -6,12 +6,14 @@ idf_component_register(SRCS
                         "bsp/lvgl_port.c"
                         "bsp/boot_button.c"
                         "services/wifi_manager.c"
+                        "services/ble_manager.c"
                         "ui/ui.c"
                         "ui/ui_helpers.c"
                         "ui/screens/ui_Screen1.c"
                         "ui/screens/ui_Screen2.c"
                         "ui/widgets/ui_comp_hook.c"
                     PRIV_REQUIRES
+                        bt
                         esp_wifi
                         esp_netif
                         nvs_flash
diff --git a/main/Kconfig.projbuild b/main/Kconfig.projbuild
index c78d713..fe5e7d9 100644
--- a/main/Kconfig.projbuild
+++ b/main/Kconfig.projbuild
@@ -66,4 +66,10 @@ menu "Example Configuration"
             bool "WAPI PSK"
     endchoice
 
+    config ESP_BLE_DEVICE_NAME
+        string "BLE device name"
+        default "HeavenlyHeroStar"
+        help
+            GAP device name advertised over BLE.
+
 endmenu
diff --git a/main/app/app_main.c b/main/app/app_main.c
index 27d60ab..87b2d51 100644
--- a/main/app/app_main.c
+++ b/main/app/app_main.c
@@ -8,6 +8,7 @@
 #include "ui.h"
 #include "ui_handlers.h"
 #include "wifi_manager.h"
+#include "ble_manager.h"
 
 static const char *TAG = "app";
 
@@ -40,4 +41,7 @@ void app_main(void)
 
     ESP_LOGI(TAG, "Starting WiFi");
     wifi_manager_init();
+
+    ESP_LOGI(TAG, "Starting BLE");
+    ble_manager_init();
 }
diff --git a/main/bsp/board_config.h b/main/bsp/board_config.h
index 5519d45..f28ca66 100644
--- a/main/bsp/board_config.h
+++ b/main/bsp/board_config.h
@@ -45,6 +45,9 @@
 #define BOARD_PIN_KEY            4
 #define BOARD_PIN_LED            16
 
+/* BLE (ESP32-S3 built-in radio) */
+#define BOARD_BLE_ENABLED        1
+
 /* LVGL port */
 #define BOARD_LVGL_DRAW_BUF_LINES    20
 #define BOARD_LVGL_TICK_PERIOD_MS    2
diff --git a/main/services/ble_manager.c b/main/services/ble_manager.c
new file mode 100644
index 0000000..c3a474c
--- /dev/null
+++ b/main/services/ble_manager.c
@@ -0,0 +1,271 @@
+#include "ble_manager.h"
+
+#include "board_config.h"
+#include "esp_log.h"
+#include "sdkconfig.h"
+
+#if BOARD_BLE_ENABLED
+
+#include "driver/gpio.h"
+#include "host/ble_hs.h"
+#include "host/ble_uuid.h"
+#include "host/util/util.h"
+#include "nimble/nimble_port.h"
+#include "nimble/nimble_port_freertos.h"
+#include "services/gap/ble_svc_gap.h"
+#include "services/gatt/ble_svc_gatt.h"
+#include "store/config/ble_store_config.h"
+
+#include <string.h>
+
+#define BLE_DEVICE_NAME CONFIG_ESP_BLE_DEVICE_NAME
+
+#define HHS_SVC_UUID16 0xFFF0
+#define HHS_CHR_UUID16 0xFFF1
+
+static const char *TAG = "ble_manager";
+
+static ble_status_cb_t s_status_cb;
+static bool s_connected;
+static uint8_t s_own_addr_type;
+static uint16_t s_conn_handle = BLE_HS_CONN_HANDLE_NONE;
+
+static uint8_t s_chr_val[20] = "HeavenlyHeroStar";
+static uint16_t s_chr_val_handle;
+static const ble_uuid16_t s_hhs_svc_uuid = BLE_UUID16_INIT(HHS_SVC_UUID16);
+static const ble_uuid16_t s_hhs_chr_uuid = BLE_UUID16_INIT(HHS_CHR_UUID16);
+
+static void start_advertising(void);
+static int gap_event_handler(struct ble_gap_event *event, void *arg);
+
+static int chr_access(uint16_t conn_handle, uint16_t attr_handle,
+                      struct ble_gatt_access_ctxt *ctxt, void *arg)
+{
+    (void)arg;
+
+    if (attr_handle != s_chr_val_handle) {
+        return BLE_ATT_ERR_UNLIKELY;
+    }
+
+    switch (ctxt->op) {
+    case BLE_GATT_ACCESS_OP_READ_CHR:
+        return os_mbuf_append(ctxt->om, s_chr_val, sizeof(s_chr_val)) == 0
+                   ? 0
+                   : BLE_ATT_ERR_INSUFFICIENT_RES;
+
+    case BLE_GATT_ACCESS_OP_WRITE_CHR: {
+        uint16_t len = OS_MBUF_PKTLEN(ctxt->om);
+        if (len > sizeof(s_chr_val)) {
+            return BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
+        }
+        memset(s_chr_val, 0, sizeof(s_chr_val));
+        int rc = ble_hs_mbuf_to_flat(ctxt->om, s_chr_val, sizeof(s_chr_val), NULL);
+        if (rc != 0) {
+            return BLE_ATT_ERR_UNLIKELY;
+        }
+        ESP_LOGI(TAG, "characteristic write from conn=%d, len=%u", conn_handle, len);
+        return 0;
+    }
+
+    default:
+        return BLE_ATT_ERR_UNLIKELY;
+    }
+}
+
+static const struct ble_gatt_svc_def s_gatt_svcs[] = {
+    {
+        .type = BLE_GATT_SVC_TYPE_PRIMARY,
+        .uuid = &s_hhs_svc_uuid.u,
+        .characteristics =
+            (struct ble_gatt_chr_def[]){
+                {
+                    .uuid = &s_hhs_chr_uuid.u,
+                    .access_cb = chr_access,
+                    .flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_WRITE,
+                    .val_handle = &s_chr_val_handle,
+                },
+                {0},
+            },
+    },
+    {0},
+};
+
+static void notify_status(bool connected)
+{
+    s_connected = connected;
+    gpio_set_level(BOARD_PIN_LED, connected ? 1 : 0);
+    if (s_status_cb != NULL) {
+        s_status_cb(connected);
+    }
+}
+
+static void start_advertising(void)
+{
+    struct ble_hs_adv_fields fields = {0};
+    struct ble_gap_adv_params adv_params = {0};
+    const char *name = ble_svc_gap_device_name();
+    int rc;
+
+    fields.flags = BLE_HS_ADV_F_DISC_GEN | BLE_HS_ADV_F_BREDR_UNSUP;
+    fields.name = (uint8_t *)name;
+    fields.name_len = strlen(name);
+    fields.name_is_complete = 1;
+
+    rc = ble_gap_adv_set_fields(&fields);
+    if (rc != 0) {
+        ESP_LOGE(TAG, "failed to set advertising data: %d", rc);
+        return;
+    }
+
+    adv_params.conn_mode = BLE_GAP_CONN_MODE_UND;
+    adv_params.disc_mode = BLE_GAP_DISC_MODE_GEN;
+
+    rc = ble_gap_adv_start(s_own_addr_type, NULL, BLE_HS_FOREVER, &adv_params,
+                           gap_event_handler, NULL);
+    if (rc != 0) {
+        ESP_LOGE(TAG, "failed to start advertising: %d", rc);
+        return;
+    }
+
+    ESP_LOGI(TAG, "advertising as \"%s\"", name);
+}
+
+static int gap_event_handler(struct ble_gap_event *event, void *arg)
+{
+    (void)arg;
+
+    switch (event->type) {
+    case BLE_GAP_EVENT_CONNECT:
+        if (event->connect.status == 0) {
+            s_conn_handle = event->connect.conn_handle;
+            ESP_LOGI(TAG, "connected, handle=%d", s_conn_handle);
+            notify_status(true);
+        } else {
+            ESP_LOGW(TAG, "connection failed, status=%d", event->connect.status);
+            start_advertising();
+        }
+        return 0;
+
+    case BLE_GAP_EVENT_DISCONNECT:
+        ESP_LOGI(TAG, "disconnected, reason=%d", event->disconnect.reason);
+        s_conn_handle = BLE_HS_CONN_HANDLE_NONE;
+        notify_status(false);
+        start_advertising();
+        return 0;
+
+    case BLE_GAP_EVENT_ADV_COMPLETE:
+        start_advertising();
+        return 0;
+
+    default:
+        return 0;
+    }
+}
+
+static void on_stack_sync(void)
+{
+    int rc = ble_hs_util_ensure_addr(0);
+    if (rc != 0) {
+        ESP_LOGE(TAG, "no available BT address");
+        return;
+    }
+
+    rc = ble_hs_id_infer_auto(0, &s_own_addr_type);
+    if (rc != 0) {
+        ESP_LOGE(TAG, "failed to infer address type: %d", rc);
+        return;
+    }
+
+    start_advertising();
+}
+
+static void on_stack_reset(int reason)
+{
+    ESP_LOGW(TAG, "nimble stack reset, reason=%d", reason);
+}
+
+static void gatt_register_cb(struct ble_gatt_register_ctxt *ctxt, void *arg)
+{
+    (void)ctxt;
+    (void)arg;
+}
+
+static int gatt_svc_init(void)
+{
+    int rc;
+
+    ble_svc_gatt_init();
+    rc = ble_gatts_count_cfg(s_gatt_svcs);
+    if (rc != 0) {
+        return rc;
+    }
+
+    return ble_gatts_add_svcs(s_gatt_svcs);
+}
+
+void ble_store_config_init(void);
+
+static void nimble_host_task(void *param)
+{
+    (void)param;
+    nimble_port_run();
+    vTaskDelete(NULL);
+}
+
+#endif /* BOARD_BLE_ENABLED */
+
+void ble_manager_set_status_cb(ble_status_cb_t cb)
+{
+#if BOARD_BLE_ENABLED
+    s_status_cb = cb;
+#else
+    (void)cb;
+#endif
+}
+
+bool ble_manager_is_connected(void)
+{
+#if BOARD_BLE_ENABLED
+    return s_connected;
+#else
+    return false;
+#endif
+}
+
+void ble_manager_init(void)
+{
+#if BOARD_BLE_ENABLED
+    int rc;
+
+    gpio_reset_pin(BOARD_PIN_LED);
+    gpio_set_direction(BOARD_PIN_LED, GPIO_MODE_OUTPUT);
+    gpio_set_level(BOARD_PIN_LED, 0);
+
+    ESP_ERROR_CHECK(nimble_port_init());
+
+    ble_svc_gap_init();
+    rc = ble_svc_gap_device_name_set(BLE_DEVICE_NAME);
+    if (rc != 0) {
+        ESP_LOGE(TAG, "failed to set device name");
+        return;
+    }
+
+    rc = gatt_svc_init();
+    if (rc != 0) {
+        ESP_LOGE(TAG, "failed to init GATT service: %d", rc);
+        return;
+    }
+
+    ble_hs_cfg.reset_cb = on_stack_reset;
+    ble_hs_cfg.sync_cb = on_stack_sync;
+    ble_hs_cfg.gatts_register_cb = gatt_register_cb;
+    ble_hs_cfg.store_status_cb = ble_store_util_status_rr;
+    ble_store_config_init();
+
+    nimble_port_freertos_init(nimble_host_task);
+
+    ESP_LOGI(TAG, "BLE peripheral started");
+#else
+    ESP_LOGI("ble_manager", "BLE disabled by board config");
+#endif
+}
diff --git a/main/services/ble_manager.h b/main/services/ble_manager.h
new file mode 100644
index 0000000..a939972
--- /dev/null
+++ b/main/services/ble_manager.h
@@ -0,0 +1,9 @@
+#pragma once
+
+#include <stdbool.h>
+
+typedef void (*ble_status_cb_t)(bool connected);
+
+void ble_manager_init(void);
+void ble_manager_set_status_cb(ble_status_cb_t cb);
+bool ble_manager_is_connected(void);
diff --git a/sdkconfig.defaults b/sdkconfig.defaults
index 24b6396..c4a1e49 100644
--- a/sdkconfig.defaults
+++ b/sdkconfig.defaults
@@ -1,2 +1,11 @@
 CONFIG_ESP_WIFI_SOFTAP_SUPPORT=n
 CONFIG_ESP_LCD_TOUCH_CST816S_DISABLE_READ_ID=y
+
+# App partition: BLE + WiFi + LVGL exceed default 1MB
+CONFIG_PARTITION_TABLE_SINGLE_APP=n
+CONFIG_PARTITION_TABLE_SINGLE_APP_LARGE=y
+
+# BLE (NimBLE peripheral, coexists with WiFi)
+CONFIG_BT_ENABLED=y
+CONFIG_BT_NIMBLE_ENABLED=y
+CONFIG_BT_NIMBLE_50_FEATURE_SUPPORT=n