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esp-idf/examples/bluetooth/bluedroid/ble/gatt_client/main/gattc_demo.c

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/*
* SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
/****************************************************************************
*
* This demo showcases BLE GATT client. It can scan BLE devices and connect to one device.
* Run the gatt_server demo, the client demo will automatically connect to the gatt_server demo.
* Client demo will enable gatt_server's notify after connection. The two devices will then exchange
* data.
*
****************************************************************************/
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include "nvs.h"
#include "nvs_flash.h"
#include "esp_bt.h"
#include "esp_gap_ble_api.h"
#include "esp_gattc_api.h"
#include "esp_gatt_defs.h"
#include "esp_bt_main.h"
#include "esp_gatt_common_api.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#define GATTC_TAG "GATTC_DEMO"
#define REMOTE_SERVICE_UUID 0x00FF
#define REMOTE_NOTIFY_CHAR_UUID 0xFF01
#define PROFILE_NUM 1
#define PROFILE_A_APP_ID 0
#define INVALID_HANDLE 0
static const char remote_device_name[] = "ESP_GATTS_DEMO";
static bool connect = false;
static bool get_server = false;
static esp_gattc_char_elem_t *char_elem_result = NULL;
static esp_gattc_descr_elem_t *descr_elem_result = NULL;
/* Declare static functions */
static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param);
static void esp_gattc_cb(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param);
static void gattc_profile_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param);
static esp_bt_uuid_t remote_filter_service_uuid = {
.len = ESP_UUID_LEN_16,
.uuid = {.uuid16 = REMOTE_SERVICE_UUID,},
};
static esp_bt_uuid_t remote_filter_char_uuid = {
.len = ESP_UUID_LEN_16,
.uuid = {.uuid16 = REMOTE_NOTIFY_CHAR_UUID,},
};
static esp_bt_uuid_t notify_descr_uuid = {
.len = ESP_UUID_LEN_16,
.uuid = {.uuid16 = ESP_GATT_UUID_CHAR_CLIENT_CONFIG,},
};
static esp_ble_scan_params_t ble_scan_params = {
.scan_type = BLE_SCAN_TYPE_ACTIVE,
.own_addr_type = BLE_ADDR_TYPE_PUBLIC,
.scan_filter_policy = BLE_SCAN_FILTER_ALLOW_ALL,
.scan_interval = 0x50,
.scan_window = 0x30,
.scan_duplicate = BLE_SCAN_DUPLICATE_DISABLE
};
struct gattc_profile_inst {
esp_gattc_cb_t gattc_cb;
uint16_t gattc_if;
uint16_t app_id;
uint16_t conn_id;
uint16_t service_start_handle;
uint16_t service_end_handle;
uint16_t char_handle;
esp_bd_addr_t remote_bda;
};
/* One gatt-based profile one app_id and one gattc_if, this array will store the gattc_if returned by ESP_GATTS_REG_EVT */
static struct gattc_profile_inst gl_profile_tab[PROFILE_NUM] = {
[PROFILE_A_APP_ID] = {
.gattc_cb = gattc_profile_event_handler,
.gattc_if = ESP_GATT_IF_NONE, /* Not get the gatt_if, so initial is ESP_GATT_IF_NONE */
},
};
static void gattc_profile_event_handler(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param)
{
esp_ble_gattc_cb_param_t *p_data = (esp_ble_gattc_cb_param_t *)param;
switch (event) {
case ESP_GATTC_REG_EVT:
ESP_LOGI(GATTC_TAG, "REG_EVT");
esp_err_t scan_ret = esp_ble_gap_set_scan_params(&ble_scan_params);
if (scan_ret){
ESP_LOGE(GATTC_TAG, "set scan params error, error code = %x", scan_ret);
}
break;
case ESP_GATTC_CONNECT_EVT:{
ESP_LOGI(GATTC_TAG, "ESP_GATTC_CONNECT_EVT conn_id %d, if %d", p_data->connect.conn_id, gattc_if);
gl_profile_tab[PROFILE_A_APP_ID].conn_id = p_data->connect.conn_id;
memcpy(gl_profile_tab[PROFILE_A_APP_ID].remote_bda, p_data->connect.remote_bda, sizeof(esp_bd_addr_t));
ESP_LOGI(GATTC_TAG, "REMOTE BDA:");
ESP_LOG_BUFFER_HEX(GATTC_TAG, gl_profile_tab[PROFILE_A_APP_ID].remote_bda, sizeof(esp_bd_addr_t));
esp_err_t mtu_ret = esp_ble_gattc_send_mtu_req (gattc_if, p_data->connect.conn_id);
if (mtu_ret){
ESP_LOGE(GATTC_TAG, "config MTU error, error code = %x", mtu_ret);
}
break;
}
case ESP_GATTC_OPEN_EVT:
if (param->open.status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "open failed, status %d", p_data->open.status);
break;
}
ESP_LOGI(GATTC_TAG, "open success");
break;
case ESP_GATTC_DIS_SRVC_CMPL_EVT:
if (param->dis_srvc_cmpl.status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "discover service failed, status %d", param->dis_srvc_cmpl.status);
break;
}
ESP_LOGI(GATTC_TAG, "discover service complete conn_id %d", param->dis_srvc_cmpl.conn_id);
esp_ble_gattc_search_service(gattc_if, param->dis_srvc_cmpl.conn_id, &remote_filter_service_uuid);
break;
case ESP_GATTC_CFG_MTU_EVT:
if (param->cfg_mtu.status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG,"config mtu failed, error status = %x", param->cfg_mtu.status);
}
ESP_LOGI(GATTC_TAG, "ESP_GATTC_CFG_MTU_EVT, Status %d, MTU %d, conn_id %d", param->cfg_mtu.status, param->cfg_mtu.mtu, param->cfg_mtu.conn_id);
break;
case ESP_GATTC_SEARCH_RES_EVT: {
ESP_LOGI(GATTC_TAG, "SEARCH RES: conn_id = %x is primary service %d", p_data->search_res.conn_id, p_data->search_res.is_primary);
ESP_LOGI(GATTC_TAG, "start handle %d end handle %d current handle value %d", p_data->search_res.start_handle, p_data->search_res.end_handle, p_data->search_res.srvc_id.inst_id);
if (p_data->search_res.srvc_id.uuid.len == ESP_UUID_LEN_16 && p_data->search_res.srvc_id.uuid.uuid.uuid16 == REMOTE_SERVICE_UUID) {
ESP_LOGI(GATTC_TAG, "service found");
get_server = true;
gl_profile_tab[PROFILE_A_APP_ID].service_start_handle = p_data->search_res.start_handle;
gl_profile_tab[PROFILE_A_APP_ID].service_end_handle = p_data->search_res.end_handle;
ESP_LOGI(GATTC_TAG, "UUID16: %x", p_data->search_res.srvc_id.uuid.uuid.uuid16);
}
break;
}
case ESP_GATTC_SEARCH_CMPL_EVT:
if (p_data->search_cmpl.status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "search service failed, error status = %x", p_data->search_cmpl.status);
break;
}
if(p_data->search_cmpl.searched_service_source == ESP_GATT_SERVICE_FROM_REMOTE_DEVICE) {
ESP_LOGI(GATTC_TAG, "Get service information from remote device");
} else if (p_data->search_cmpl.searched_service_source == ESP_GATT_SERVICE_FROM_NVS_FLASH) {
ESP_LOGI(GATTC_TAG, "Get service information from flash");
} else {
ESP_LOGI(GATTC_TAG, "unknown service source");
}
ESP_LOGI(GATTC_TAG, "ESP_GATTC_SEARCH_CMPL_EVT");
if (get_server){
uint16_t count = 0;
esp_gatt_status_t status = esp_ble_gattc_get_attr_count( gattc_if,
p_data->search_cmpl.conn_id,
ESP_GATT_DB_CHARACTERISTIC,
gl_profile_tab[PROFILE_A_APP_ID].service_start_handle,
gl_profile_tab[PROFILE_A_APP_ID].service_end_handle,
INVALID_HANDLE,
&count);
if (status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_attr_count error");
break;
}
if (count > 0){
char_elem_result = (esp_gattc_char_elem_t *)malloc(sizeof(esp_gattc_char_elem_t) * count);
if (!char_elem_result){
ESP_LOGE(GATTC_TAG, "gattc no mem");
break;
}else{
status = esp_ble_gattc_get_char_by_uuid( gattc_if,
p_data->search_cmpl.conn_id,
gl_profile_tab[PROFILE_A_APP_ID].service_start_handle,
gl_profile_tab[PROFILE_A_APP_ID].service_end_handle,
remote_filter_char_uuid,
char_elem_result,
&count);
if (status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_char_by_uuid error");
free(char_elem_result);
char_elem_result = NULL;
break;
}
/* Every service have only one char in our 'ESP_GATTS_DEMO' demo, so we used first 'char_elem_result' */
if (count > 0 && (char_elem_result[0].properties & ESP_GATT_CHAR_PROP_BIT_NOTIFY)){
gl_profile_tab[PROFILE_A_APP_ID].char_handle = char_elem_result[0].char_handle;
esp_ble_gattc_register_for_notify (gattc_if, gl_profile_tab[PROFILE_A_APP_ID].remote_bda, char_elem_result[0].char_handle);
}
}
/* free char_elem_result */
free(char_elem_result);
}else{
ESP_LOGE(GATTC_TAG, "no char found");
}
}
break;
case ESP_GATTC_REG_FOR_NOTIFY_EVT: {
ESP_LOGI(GATTC_TAG, "ESP_GATTC_REG_FOR_NOTIFY_EVT");
if (p_data->reg_for_notify.status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "REG FOR NOTIFY failed: error status = %d", p_data->reg_for_notify.status);
}else{
uint16_t count = 0;
uint16_t notify_en = 1;
esp_gatt_status_t ret_status = esp_ble_gattc_get_attr_count( gattc_if,
gl_profile_tab[PROFILE_A_APP_ID].conn_id,
ESP_GATT_DB_DESCRIPTOR,
gl_profile_tab[PROFILE_A_APP_ID].service_start_handle,
gl_profile_tab[PROFILE_A_APP_ID].service_end_handle,
gl_profile_tab[PROFILE_A_APP_ID].char_handle,
&count);
if (ret_status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_attr_count error");
break;
}
if (count > 0){
descr_elem_result = malloc(sizeof(esp_gattc_descr_elem_t) * count);
if (!descr_elem_result){
ESP_LOGE(GATTC_TAG, "malloc error, gattc no mem");
break;
}else{
ret_status = esp_ble_gattc_get_descr_by_char_handle( gattc_if,
gl_profile_tab[PROFILE_A_APP_ID].conn_id,
p_data->reg_for_notify.handle,
notify_descr_uuid,
descr_elem_result,
&count);
if (ret_status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "esp_ble_gattc_get_descr_by_char_handle error");
free(descr_elem_result);
descr_elem_result = NULL;
break;
}
/* Every char has only one descriptor in our 'ESP_GATTS_DEMO' demo, so we used first 'descr_elem_result' */
if (count > 0 && descr_elem_result[0].uuid.len == ESP_UUID_LEN_16 && descr_elem_result[0].uuid.uuid.uuid16 == ESP_GATT_UUID_CHAR_CLIENT_CONFIG){
ret_status = esp_ble_gattc_write_char_descr( gattc_if,
gl_profile_tab[PROFILE_A_APP_ID].conn_id,
descr_elem_result[0].handle,
sizeof(notify_en),
(uint8_t *)&notify_en,
ESP_GATT_WRITE_TYPE_RSP,
ESP_GATT_AUTH_REQ_NONE);
}
if (ret_status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "esp_ble_gattc_write_char_descr error");
}
/* free descr_elem_result */
free(descr_elem_result);
}
}
else{
ESP_LOGE(GATTC_TAG, "decsr not found");
}
}
break;
}
case ESP_GATTC_NOTIFY_EVT:
if (p_data->notify.is_notify){
ESP_LOGI(GATTC_TAG, "ESP_GATTC_NOTIFY_EVT, receive notify value:");
}else{
ESP_LOGI(GATTC_TAG, "ESP_GATTC_NOTIFY_EVT, receive indicate value:");
}
ESP_LOG_BUFFER_HEX(GATTC_TAG, p_data->notify.value, p_data->notify.value_len);
break;
case ESP_GATTC_WRITE_DESCR_EVT:
if (p_data->write.status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "write descr failed, error status = %x", p_data->write.status);
break;
}
ESP_LOGI(GATTC_TAG, "write descr success ");
uint8_t write_char_data[35];
for (int i = 0; i < sizeof(write_char_data); ++i)
{
write_char_data[i] = i % 256;
}
esp_ble_gattc_write_char( gattc_if,
gl_profile_tab[PROFILE_A_APP_ID].conn_id,
gl_profile_tab[PROFILE_A_APP_ID].char_handle,
sizeof(write_char_data),
write_char_data,
ESP_GATT_WRITE_TYPE_RSP,
ESP_GATT_AUTH_REQ_NONE);
break;
case ESP_GATTC_SRVC_CHG_EVT: {
esp_bd_addr_t bda;
memcpy(bda, p_data->srvc_chg.remote_bda, sizeof(esp_bd_addr_t));
ESP_LOGI(GATTC_TAG, "ESP_GATTC_SRVC_CHG_EVT, bd_addr:");
ESP_LOG_BUFFER_HEX(GATTC_TAG, bda, sizeof(esp_bd_addr_t));
break;
}
case ESP_GATTC_WRITE_CHAR_EVT:
if (p_data->write.status != ESP_GATT_OK){
ESP_LOGE(GATTC_TAG, "write char failed, error status = %x", p_data->write.status);
break;
}
ESP_LOGI(GATTC_TAG, "write char success ");
break;
case ESP_GATTC_DISCONNECT_EVT:
connect = false;
get_server = false;
ESP_LOGI(GATTC_TAG, "ESP_GATTC_DISCONNECT_EVT, reason = %d", p_data->disconnect.reason);
break;
default:
break;
}
}
static void esp_gap_cb(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param)
{
uint8_t *adv_name = NULL;
uint8_t adv_name_len = 0;
switch (event) {
case ESP_GAP_BLE_SCAN_PARAM_SET_COMPLETE_EVT: {
//the unit of the duration is second
uint32_t duration = 30;
esp_ble_gap_start_scanning(duration);
break;
}
case ESP_GAP_BLE_SCAN_START_COMPLETE_EVT:
//scan start complete event to indicate scan start successfully or failed
if (param->scan_start_cmpl.status != ESP_BT_STATUS_SUCCESS) {
ESP_LOGE(GATTC_TAG, "scan start failed, error status = %x", param->scan_start_cmpl.status);
break;
}
ESP_LOGI(GATTC_TAG, "scan start success");
break;
case ESP_GAP_BLE_SCAN_RESULT_EVT: {
esp_ble_gap_cb_param_t *scan_result = (esp_ble_gap_cb_param_t *)param;
switch (scan_result->scan_rst.search_evt) {
case ESP_GAP_SEARCH_INQ_RES_EVT:
ESP_LOG_BUFFER_HEX(GATTC_TAG, scan_result->scan_rst.bda, 6);
ESP_LOGI(GATTC_TAG, "searched Adv Data Len %d, Scan Response Len %d", scan_result->scan_rst.adv_data_len, scan_result->scan_rst.scan_rsp_len);
adv_name = esp_ble_resolve_adv_data(scan_result->scan_rst.ble_adv,
ESP_BLE_AD_TYPE_NAME_CMPL, &adv_name_len);
ESP_LOGI(GATTC_TAG, "searched Device Name Len %d", adv_name_len);
ESP_LOG_BUFFER_CHAR(GATTC_TAG, adv_name, adv_name_len);
#if CONFIG_EXAMPLE_DUMP_ADV_DATA_AND_SCAN_RESP
if (scan_result->scan_rst.adv_data_len > 0) {
ESP_LOGI(GATTC_TAG, "adv data:");
ESP_LOG_BUFFER_HEX(GATTC_TAG, &scan_result->scan_rst.ble_adv[0], scan_result->scan_rst.adv_data_len);
}
if (scan_result->scan_rst.scan_rsp_len > 0) {
ESP_LOGI(GATTC_TAG, "scan resp:");
ESP_LOG_BUFFER_HEX(GATTC_TAG, &scan_result->scan_rst.ble_adv[scan_result->scan_rst.adv_data_len], scan_result->scan_rst.scan_rsp_len);
}
#endif
ESP_LOGI(GATTC_TAG, " ");
if (adv_name != NULL) {
if (strlen(remote_device_name) == adv_name_len && strncmp((char *)adv_name, remote_device_name, adv_name_len) == 0) {
ESP_LOGI(GATTC_TAG, "searched device %s", remote_device_name);
if (connect == false) {
connect = true;
ESP_LOGI(GATTC_TAG, "connect to the remote device.");
esp_ble_gap_stop_scanning();
esp_ble_gattc_open(gl_profile_tab[PROFILE_A_APP_ID].gattc_if, scan_result->scan_rst.bda, scan_result->scan_rst.ble_addr_type, true);
}
}
}
break;
case ESP_GAP_SEARCH_INQ_CMPL_EVT:
break;
default:
break;
}
break;
}
case ESP_GAP_BLE_SCAN_STOP_COMPLETE_EVT:
if (param->scan_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){
ESP_LOGE(GATTC_TAG, "scan stop failed, error status = %x", param->scan_stop_cmpl.status);
break;
}
ESP_LOGI(GATTC_TAG, "stop scan successfully");
break;
case ESP_GAP_BLE_ADV_STOP_COMPLETE_EVT:
if (param->adv_stop_cmpl.status != ESP_BT_STATUS_SUCCESS){
ESP_LOGE(GATTC_TAG, "adv stop failed, error status = %x", param->adv_stop_cmpl.status);
break;
}
ESP_LOGI(GATTC_TAG, "stop adv successfully");
break;
case ESP_GAP_BLE_UPDATE_CONN_PARAMS_EVT:
ESP_LOGI(GATTC_TAG, "update connection params 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;
case ESP_GAP_BLE_SET_PKT_LENGTH_COMPLETE_EVT:
ESP_LOGI(GATTC_TAG, "packet length updated: rx = %d, tx = %d, status = %d",
param->pkt_data_length_cmpl.params.rx_len,
param->pkt_data_length_cmpl.params.tx_len,
param->pkt_data_length_cmpl.status);
break;
default:
break;
}
}
static void esp_gattc_cb(esp_gattc_cb_event_t event, esp_gatt_if_t gattc_if, esp_ble_gattc_cb_param_t *param)
{
/* If event is register event, store the gattc_if for each profile */
if (event == ESP_GATTC_REG_EVT) {
if (param->reg.status == ESP_GATT_OK) {
gl_profile_tab[param->reg.app_id].gattc_if = gattc_if;
} else {
ESP_LOGI(GATTC_TAG, "reg app failed, app_id %04x, status %d",
param->reg.app_id,
param->reg.status);
return;
}
}
/* If the gattc_if equal to profile A, call profile A cb handler,
* so here call each profile's callback */
do {
int idx;
for (idx = 0; idx < PROFILE_NUM; idx++) {
if (gattc_if == ESP_GATT_IF_NONE || /* ESP_GATT_IF_NONE, not specify a certain gatt_if, need to call every profile cb function */
gattc_if == gl_profile_tab[idx].gattc_if) {
if (gl_profile_tab[idx].gattc_cb) {
gl_profile_tab[idx].gattc_cb(event, gattc_if, param);
}
}
}
} while (0);
}
void app_main(void)
{
// Initialize NVS.
esp_err_t 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(GATTC_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(GATTC_TAG, "%s enable controller failed: %s", __func__, esp_err_to_name(ret));
return;
}
ret = esp_bluedroid_init();
if (ret) {
ESP_LOGE(GATTC_TAG, "%s init bluetooth failed: %s", __func__, esp_err_to_name(ret));
return;
}
ret = esp_bluedroid_enable();
if (ret) {
ESP_LOGE(GATTC_TAG, "%s enable bluetooth failed: %s", __func__, esp_err_to_name(ret));
return;
}
//register the callback function to the gap module
ret = esp_ble_gap_register_callback(esp_gap_cb);
if (ret){
ESP_LOGE(GATTC_TAG, "%s gap register failed, error code = %x", __func__, ret);
return;
}
//register the callback function to the gattc module
ret = esp_ble_gattc_register_callback(esp_gattc_cb);
if(ret){
ESP_LOGE(GATTC_TAG, "%s gattc register failed, error code = %x", __func__, ret);
return;
}
ret = esp_ble_gattc_app_register(PROFILE_A_APP_ID);
if (ret){
ESP_LOGE(GATTC_TAG, "%s gattc app register failed, error code = %x", __func__, ret);
}
esp_err_t local_mtu_ret = esp_ble_gatt_set_local_mtu(500);
if (local_mtu_ret){
ESP_LOGE(GATTC_TAG, "set local MTU failed, error code = %x", local_mtu_ret);
}
}
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