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esp-idf/examples/bluetooth/bluedroid/classic_bt/bt_discovery/main/main.c

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/*
* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
/****************************************************************************
*
* This file is for Classic Bluetooth device and service discovery Demo.
*
****************************************************************************/
#include <stdint.h>
#include <string.h>
#include <inttypes.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "nvs.h"
#include "nvs_flash.h"
#include "esp_system.h"
#include "esp_log.h"
#include "esp_bt.h"
#include "esp_bt_main.h"
#include "esp_bt_device.h"
#include "esp_gap_bt_api.h"
#define GAP_TAG "GAP"
typedef enum {
APP_GAP_STATE_IDLE = 0,
APP_GAP_STATE_DEVICE_DISCOVERING,
APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE,
APP_GAP_STATE_SERVICE_DISCOVERING,
APP_GAP_STATE_SERVICE_DISCOVER_COMPLETE,
} app_gap_state_t;
typedef struct {
bool dev_found;
uint8_t bdname_len;
uint8_t eir_len;
uint8_t rssi;
uint32_t cod;
uint8_t eir[ESP_BT_GAP_EIR_DATA_LEN];
uint8_t bdname[ESP_BT_GAP_MAX_BDNAME_LEN + 1];
esp_bd_addr_t bda;
app_gap_state_t state;
} app_gap_cb_t;
static app_gap_cb_t m_dev_info;
static char *bda2str(esp_bd_addr_t bda, char *str, size_t size)
{
if (bda == NULL || str == NULL || size < 18) {
return NULL;
}
uint8_t *p = bda;
sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
p[0], p[1], p[2], p[3], p[4], p[5]);
return str;
}
static char *uuid2str(esp_bt_uuid_t *uuid, char *str, size_t size)
{
if (uuid == NULL || str == NULL) {
return NULL;
}
if (uuid->len == 2 && size >= 5) {
sprintf(str, "%04x", uuid->uuid.uuid16);
} else if (uuid->len == 4 && size >= 9) {
sprintf(str, "%08"PRIx32, uuid->uuid.uuid32);
} else if (uuid->len == 16 && size >= 37) {
uint8_t *p = uuid->uuid.uuid128;
sprintf(str, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
p[15], p[14], p[13], p[12], p[11], p[10], p[9], p[8],
p[7], p[6], p[5], p[4], p[3], p[2], p[1], p[0]);
} else {
return NULL;
}
return str;
}
static bool get_name_from_eir(uint8_t *eir, uint8_t *bdname, uint8_t *bdname_len)
{
uint8_t *rmt_bdname = NULL;
uint8_t rmt_bdname_len = 0;
if (!eir) {
return false;
}
rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_CMPL_LOCAL_NAME, &rmt_bdname_len);
if (!rmt_bdname) {
rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_SHORT_LOCAL_NAME, &rmt_bdname_len);
}
if (rmt_bdname) {
if (rmt_bdname_len > ESP_BT_GAP_MAX_BDNAME_LEN) {
rmt_bdname_len = ESP_BT_GAP_MAX_BDNAME_LEN;
}
if (bdname) {
memcpy(bdname, rmt_bdname, rmt_bdname_len);
bdname[rmt_bdname_len] = '\0';
}
if (bdname_len) {
*bdname_len = rmt_bdname_len;
}
return true;
}
return false;
}
static void update_device_info(esp_bt_gap_cb_param_t *param)
{
char bda_str[18];
uint32_t cod = 0;
int32_t rssi = -129; /* invalid value */
uint8_t *bdname = NULL;
uint8_t bdname_len = 0;
uint8_t *eir = NULL;
uint8_t eir_len = 0;
esp_bt_gap_dev_prop_t *p;
ESP_LOGI(GAP_TAG, "Device found: %s", bda2str(param->disc_res.bda, bda_str, 18));
for (int i = 0; i < param->disc_res.num_prop; i++) {
p = param->disc_res.prop + i;
switch (p->type) {
case ESP_BT_GAP_DEV_PROP_COD:
cod = *(uint32_t *)(p->val);
ESP_LOGI(GAP_TAG, "--Class of Device: 0x%"PRIx32, cod);
break;
case ESP_BT_GAP_DEV_PROP_RSSI:
rssi = *(int8_t *)(p->val);
ESP_LOGI(GAP_TAG, "--RSSI: %"PRId32, rssi);
break;
case ESP_BT_GAP_DEV_PROP_BDNAME:
bdname_len = (p->len > ESP_BT_GAP_MAX_BDNAME_LEN) ? ESP_BT_GAP_MAX_BDNAME_LEN :
(uint8_t)p->len;
bdname = (uint8_t *)(p->val);
break;
case ESP_BT_GAP_DEV_PROP_EIR: {
eir_len = p->len;
eir = (uint8_t *)(p->val);
break;
}
default:
break;
}
}
/* search for device with Major device type "PHONE" or "Audio/Video" in COD */
app_gap_cb_t *p_dev = &m_dev_info;
if (p_dev->dev_found) {
return;
}
if (!esp_bt_gap_is_valid_cod(cod) ||
(!(esp_bt_gap_get_cod_major_dev(cod) == ESP_BT_COD_MAJOR_DEV_PHONE) &&
!(esp_bt_gap_get_cod_major_dev(cod) == ESP_BT_COD_MAJOR_DEV_AV))) {
return;
}
memcpy(p_dev->bda, param->disc_res.bda, ESP_BD_ADDR_LEN);
p_dev->dev_found = true;
p_dev->cod = cod;
p_dev->rssi = rssi;
if (bdname_len > 0) {
memcpy(p_dev->bdname, bdname, bdname_len);
p_dev->bdname[bdname_len] = '\0';
p_dev->bdname_len = bdname_len;
}
if (eir_len > 0) {
memcpy(p_dev->eir, eir, eir_len);
p_dev->eir_len = eir_len;
}
if (p_dev->bdname_len == 0) {
get_name_from_eir(p_dev->eir, p_dev->bdname, &p_dev->bdname_len);
}
ESP_LOGI(GAP_TAG, "Found a target device, address %s, name %s", bda_str, p_dev->bdname);
p_dev->state = APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE;
ESP_LOGI(GAP_TAG, "Cancel device discovery ...");
esp_bt_gap_cancel_discovery();
}
static void bt_app_gap_init(void)
{
app_gap_cb_t *p_dev = &m_dev_info;
memset(p_dev, 0, sizeof(app_gap_cb_t));
p_dev->state = APP_GAP_STATE_IDLE;
}
static void bt_app_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)
{
app_gap_cb_t *p_dev = &m_dev_info;
char bda_str[18];
char uuid_str[37];
switch (event) {
case ESP_BT_GAP_DISC_RES_EVT: {
update_device_info(param);
break;
}
case ESP_BT_GAP_DISC_STATE_CHANGED_EVT: {
if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STOPPED) {
ESP_LOGI(GAP_TAG, "Device discovery stopped.");
if ( (p_dev->state == APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE ||
p_dev->state == APP_GAP_STATE_DEVICE_DISCOVERING)
&& p_dev->dev_found) {
p_dev->state = APP_GAP_STATE_SERVICE_DISCOVERING;
ESP_LOGI(GAP_TAG, "Discover services ...");
esp_bt_gap_get_remote_services(p_dev->bda);
}
} else if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STARTED) {
ESP_LOGI(GAP_TAG, "Discovery started.");
}
break;
}
case ESP_BT_GAP_RMT_SRVCS_EVT: {
if (memcmp(param->rmt_srvcs.bda, p_dev->bda, ESP_BD_ADDR_LEN) == 0 &&
p_dev->state == APP_GAP_STATE_SERVICE_DISCOVERING) {
p_dev->state = APP_GAP_STATE_SERVICE_DISCOVER_COMPLETE;
if (param->rmt_srvcs.stat == ESP_BT_STATUS_SUCCESS) {
ESP_LOGI(GAP_TAG, "Services for device %s found", bda2str(p_dev->bda, bda_str, 18));
for (int i = 0; i < param->rmt_srvcs.num_uuids; i++) {
esp_bt_uuid_t *u = param->rmt_srvcs.uuid_list + i;
ESP_LOGI(GAP_TAG, "--%s", uuid2str(u, uuid_str, 37));
}
} else {
ESP_LOGI(GAP_TAG, "Services for device %s not found", bda2str(p_dev->bda, bda_str, 18));
}
}
break;
}
case ESP_BT_GAP_RMT_SRVC_REC_EVT:
default: {
ESP_LOGI(GAP_TAG, "event: %d", event);
break;
}
}
return;
}
static void bt_app_gap_start_up(void)
{
/* register GAP callback function */
esp_bt_gap_register_callback(bt_app_gap_cb);
char *dev_name = "ESP_GAP_INQRUIY";
esp_bt_gap_set_device_name(dev_name);
/* set discoverable and connectable mode, wait to be connected */
esp_bt_gap_set_scan_mode(ESP_BT_CONNECTABLE, ESP_BT_GENERAL_DISCOVERABLE);
/* initialize device information and status */
bt_app_gap_init();
/* start to discover nearby Bluetooth devices */
app_gap_cb_t *p_dev = &m_dev_info;
p_dev->state = APP_GAP_STATE_DEVICE_DISCOVERING;
esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, 10, 0);
}
void app_main(void)
{
/* Initialize NVS — it is used to store PHY calibration data and save key-value pairs in flash memory*/
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_BLE));
esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
if ((ret = esp_bt_controller_init(&bt_cfg)) != ESP_OK) {
ESP_LOGE(GAP_TAG, "%s initialize controller failed: %s", __func__, esp_err_to_name(ret));
return;
}
if ((ret = esp_bt_controller_enable(ESP_BT_MODE_CLASSIC_BT)) != ESP_OK) {
ESP_LOGE(GAP_TAG, "%s enable controller failed: %s", __func__, esp_err_to_name(ret));
return;
}
esp_bluedroid_config_t bluedroid_cfg = BT_BLUEDROID_INIT_CONFIG_DEFAULT();
if ((ret = esp_bluedroid_init_with_cfg(&bluedroid_cfg)) != ESP_OK) {
ESP_LOGE(GAP_TAG, "%s initialize bluedroid failed: %s", __func__, esp_err_to_name(ret));
return;
}
if ((ret = esp_bluedroid_enable()) != ESP_OK) {
ESP_LOGE(GAP_TAG, "%s enable bluedroid failed: %s", __func__, esp_err_to_name(ret));
return;
}
bt_app_gap_start_up();
}
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