OVMS3-idf/components/bt/bluedroid/api/esp_gatt_common_api.c

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// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include "esp_gatt_common_api.h"
#include "esp_bt_main.h"
#include "esp_gatt_defs.h"
#include "btc_main.h"
/**
* @brief This function is called to set local MTU,
* the function is called before BLE connection.
*
* @param[in] mtu: the size of MTU.
*
* @return
* - ESP_OK: success
* - other: failed
*
*/
esp_err_t esp_ble_gatt_set_local_mtu (uint16_t mtu)
{
btc_msg_t msg;
btc_ble_main_args_t arg;
ESP_BLUEDROID_STATUS_CHECK(ESP_BLUEDROID_STATUS_ENABLED);
if ((mtu < ESP_GATT_DEF_BLE_MTU_SIZE) || (mtu > ESP_GATT_MAX_MTU_SIZE)) {
return ESP_GATT_ILLEGAL_PARAMETER;
}
msg.sig = BTC_SIG_API_CALL;
msg.pid = BTC_PID_MAIN_INIT;
msg.act = BTC_GATT_ACT_SET_LOCAL_MTU;
arg.set_mtu.mtu = mtu;
return (btc_transfer_context(&msg, &arg, sizeof(btc_ble_main_args_t), NULL) == BT_STATUS_SUCCESS ? ESP_OK : ESP_FAIL);
}