bluetooth: Fix GATT incoming data size

GATT data size can not be 1024 bytes due to BLE specification.
Decrease the size of area for the GATT incoming data so as to
decrease the memory usage.

sdk/modules/include/bluetooth/hal/bt_event.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * modules/include/bluetooth/hal/bt_event.h
  *
- *   Copyright 2018 Sony Semiconductor Solutions Corporation
+ *   Copyright 2018, 2022 Sony Semiconductor Solutions Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -72,6 +72,13 @@
 #define BLE_MAX_ADV_DATA_LEN 31
 /** @} */
 
+/**
+ *@name Max ble GATT data length
+ *@{
+ */
+#define BLE_MAX_GATT_DATA_LEN 244
+/** @} */
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/
@@ -428,7 +435,7 @@ struct ble_gatt_event_write_req_t
   uint16_t serv_handle;                /**< Service handle ID @ref ble_gatt_service_s */
   uint16_t char_handle;                /**< Characteristic handle ID @ref ble_gatt_char_s */
   uint16_t length;                     /**< Write data length */
-  uint8_t data[BT_MAX_EVENT_DATA_LEN]; /**< Write data */
+  uint8_t data[BLE_MAX_GATT_DATA_LEN]; /**< Write data */
 };
 
 /**
@@ -482,7 +489,7 @@ struct ble_gatt_event_read_rsp_t
   uint16_t conn_handle;                /**< Connection handle ID */
   uint16_t char_handle;                /**< Characteristic handle ID @ref ble_gatt_char_s */
   uint16_t length;                     /**< Read data length */
-  uint8_t data[BT_MAX_EVENT_DATA_LEN]; /**< Read data */
+  uint8_t data[BLE_MAX_GATT_DATA_LEN]; /**< Read data */
 };
 
 /**