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/*
* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "esp_bt.h"
#include "esp_gap_ble_api.h"
#include "esp_gatts_api.h"
#include "esp_bt_defs.h"
#include "esp_bt_main.h"
#include "esp_bt_device.h"
#include "esp_gatt_common_api.h"
#define APP_ID_PLACEHOLDER 0
static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param);
static void gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param);
static const char *CONN_TAG = "CONN_DEMO";
static const char device_name[] = "Bluedroid_Conn";
static esp_ble_adv_params_t adv_params = {
.adv_int_min = 0x20, // 20ms
.adv_int_max = 0x20, // 20ms
.adv_type = ADV_TYPE_IND,
.own_addr_type = BLE_ADDR_TYPE_PUBLIC,
.channel_map = ADV_CHNL_ALL,
.adv_filter_policy = ADV_FILTER_ALLOW_SCAN_ANY_CON_ANY,
};
static uint8_t adv_raw_data[] = {
0x02, ESP_BLE_AD_TYPE_FLAG, 0x06,
0x0F, ESP_BLE_AD_TYPE_NAME_CMPL, 'B', 'l', 'u', 'e', 'd', 'r', 'o', 'i', 'd', '_', 'C', 'o', 'n', 'n',
0x02, ESP_BLE_AD_TYPE_TX_PWR, 0x09,
};
void app_main(void)
{
esp_err_t ret;
//initialize NVS
ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK( ret );
ESP_ERROR_CHECK(esp_bt_controller_mem_release(ESP_BT_MODE_CLASSIC_BT));
esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
ret = esp_bt_controller_init(&bt_cfg);
if (ret) {
ESP_LOGE(CONN_TAG, "%s initialize controller failed: %s", __func__, esp_err_to_name(ret));
return;
}
ret = esp_bt_controller_enable(ESP_BT_MODE_BLE);
if (ret) {
ESP_LOGE(CONN_TAG, "%s enable controller failed: %s", __func__, esp_err_to_name(ret));
return;
}
ret = esp_bluedroid_init();
if (ret) {
ESP_LOGE(CONN_TAG, "%s init bluetooth failed: %s", __func__, esp_err_to_name(ret));
return;
}
ret = esp_bluedroid_enable();
if (ret) {
ESP_LOGE(CONN_TAG, "%s enable bluetooth failed: %s", __func__, esp_err_to_name(ret));
return;
}
ret = esp_ble_gap_register_callback(esp_gap_cb);
if (ret) {
ESP_LOGE(CONN_TAG, "%s gap register failed, error code = %x", __func__, ret);
return;
}
ret = esp_ble_gatts_register_callback(gatts_event_handler);
if (ret) {
ESP_LOGE(CONN_TAG, "%s gatts register failed, error code = %x", __func__, ret);
return;
}
ret = esp_ble_gatts_app_register(APP_ID_PLACEHOLDER);
if (ret) {
ESP_LOGE(CONN_TAG, "%s gatts app register failed, error code = %x", __func__, ret);
return;
}
ret = esp_ble_gatt_set_local_mtu(500);
if (ret) {
ESP_LOGE(CONN_TAG, "set local MTU failed, error code = %x", ret);
return;
}
ret = esp_ble_gap_set_device_name(device_name);
if (ret) {
ESP_LOGE(CONN_TAG, "set device name failed, error code = %x", ret);
return;
}
ret = esp_ble_gap_config_adv_data_raw(adv_raw_data, sizeof(adv_raw_data));
if (ret) {
ESP_LOGE(CONN_TAG, "config adv data failed, error code = %x", ret);
}
}
static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param)
{
switch (event) {
case ESP_GAP_BLE_ADV_DATA_RAW_SET_COMPLETE_EVT:
ESP_LOGI(CONN_TAG, "Advertising data set, status %d", param->adv_data_raw_cmpl.status);
esp_ble_gap_start_advertising(&adv_params);
break;
case ESP_GAP_BLE_ADV_START_COMPLETE_EVT:
if (param->adv_start_cmpl.status != ESP_BT_STATUS_SUCCESS) {
ESP_LOGE(CONN_TAG, "Advertising start failed, status %d", param->adv_start_cmpl.status);
break;
}
ESP_LOGI(CONN_TAG, "Advertising start successfully");
break;
case ESP_GAP_BLE_ADV_STOP_COMPLETE_EVT:
if (param->adv_stop_cmpl.status != ESP_BT_STATUS_SUCCESS) {
ESP_LOGE(CONN_TAG, "Advertising stop failed, status %d", param->adv_stop_cmpl.status);
}
ESP_LOGI(CONN_TAG, "Advertising stop successfully");
break;
case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
ESP_LOGI(CONN_TAG, "Connection params update, status %d, conn_int %d, latency %d, timeout %d",
param->update_conn_params.status,
param->update_conn_params.conn_int,
param->update_conn_params.latency,
param->update_conn_params.timeout);
break;
default:
break;
}
}
//because we only have one profile table in this demo, there is only one set of gatts evemt handler
static void gatts_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param)
{
switch (event) {
case ESP_GATTS_REG_EVT:
ESP_LOGI(CONN_TAG, "GATT server register, status %d, app_id %d", param->reg.status, param->reg.app_id);
break;
case ESP_GATTS_CONNECT_EVT:
esp_ble_conn_update_params_t conn_params = {0};
memcpy(conn_params.bda, param->connect.remote_bda, sizeof(esp_bd_addr_t));
conn_params.latency = 0;
conn_params.max_int = 0x20;
conn_params.min_int = 0x10;
conn_params.timeout = 400;
ESP_LOGI(CONN_TAG, "Connected, conn_id %u, remote "ESP_BD_ADDR_STR"",
param->connect.conn_id, ESP_BD_ADDR_HEX(param->connect.remote_bda));
esp_ble_gap_update_conn_params(&conn_params);
break;
case ESP_GATTS_DISCONNECT_EVT:
ESP_LOGI(CONN_TAG, "Disconnected, remote "ESP_BD_ADDR_STR", reason 0x%02x",
ESP_BD_ADDR_HEX(param->disconnect.remote_bda), param->disconnect.reason);
esp_ble_gap_start_advertising(&adv_params);
break;
default:
break;
}
}
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