[FL-2623] Add BLE disconnect request #1686

Co-authored-by: LionZXY <nikita@kulikof.ru>
Co-authored-by: あく <alleteam@gmail.com>

firmware/targets/furi_hal_include/furi_hal_bt_serial.h

@@ -8,6 +8,11 @@ extern "C" {
 
 #define FURI_HAL_BT_SERIAL_PACKET_SIZE_MAX SERIAL_SVC_DATA_LEN_MAX
 
+typedef enum {
+    FuriHalBtSerialRpcStatusNotActive,
+    FuriHalBtSerialRpcStatusActive,
+} FuriHalBtSerialRpcStatus;
+
 /** Serial service callback type */
 typedef SerialServiceEventCallback FuriHalBtSerialCallback;
 
@@ -30,6 +35,12 @@ void furi_hal_bt_serial_set_event_callback(
     FuriHalBtSerialCallback callback,
     void* context);
 
+/** Set BLE RPC status
+ *
+ * @param status        FuriHalBtSerialRpcStatus instance
+ */
+void furi_hal_bt_serial_set_rpc_status(FuriHalBtSerialRpcStatus status);
+
 /** Notify that application buffer is empty
  */
 void furi_hal_bt_serial_notify_buffer_is_empty();