2 This example code is in the Public Domain (or CC0 licensed, at your option.)
4 Unless required by applicable law or agreed to in writing, this
5 software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
6 CONDITIONS OF ANY KIND, either express or implied.
11 /****************************************************************************
13 * This file is for Classic Bluetooth device and service discovery Demo.
15 ****************************************************************************/
19 #include "freertos/FreeRTOS.h"
20 #include "freertos/task.h"
22 #include "nvs_flash.h"
23 #include "esp_system.h"
26 #include "esp_bt_main.h"
27 #include "esp_bt_device.h"
28 #include "esp_gap_bt_api.h"
33 APP_GAP_STATE_IDLE = 0,
34 APP_GAP_STATE_DEVICE_DISCOVERING,
35 APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE,
36 APP_GAP_STATE_SERVICE_DISCOVERING,
37 APP_GAP_STATE_SERVICE_DISCOVER_COMPLETE,
46 uint8_t eir[ESP_BT_GAP_EIR_DATA_LEN];
47 uint8_t bdname[ESP_BT_GAP_MAX_BDNAME_LEN + 1];
49 app_gap_state_t state;
52 static app_gap_cb_t m_dev_info;
54 static char *bda2str(esp_bd_addr_t bda, char *str, size_t size)
56 if (bda == NULL || str == NULL || size < 18) {
61 sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
62 p[0], p[1], p[2], p[3], p[4], p[5]);
66 static char *uuid2str(esp_bt_uuid_t *uuid, char *str, size_t size)
68 if (uuid == NULL || str == NULL) {
72 if (uuid->len == 2 && size >= 5) {
73 sprintf(str, "%04x", uuid->uuid.uuid16);
74 } else if (uuid->len == 4 && size >= 9) {
75 sprintf(str, "%08x", uuid->uuid.uuid32);
76 } else if (uuid->len == 16 && size >= 37) {
77 uint8_t *p = uuid->uuid.uuid128;
78 sprintf(str, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
79 p[15], p[14], p[13], p[12], p[11], p[10], p[9], p[8],
80 p[7], p[6], p[5], p[4], p[3], p[2], p[1], p[0]);
88 static bool get_name_from_eir(uint8_t *eir, uint8_t *bdname, uint8_t *bdname_len)
90 uint8_t *rmt_bdname = NULL;
91 uint8_t rmt_bdname_len = 0;
97 rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_CMPL_LOCAL_NAME, &rmt_bdname_len);
99 rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_SHORT_LOCAL_NAME, &rmt_bdname_len);
103 if (rmt_bdname_len > ESP_BT_GAP_MAX_BDNAME_LEN) {
104 rmt_bdname_len = ESP_BT_GAP_MAX_BDNAME_LEN;
108 memcpy(bdname, rmt_bdname, rmt_bdname_len);
109 bdname[rmt_bdname_len] = '\0';
112 *bdname_len = rmt_bdname_len;
120 static void update_device_info(esp_bt_gap_cb_param_t *param)
124 int32_t rssi = -129; /* invalid value */
125 esp_bt_gap_dev_prop_t *p;
127 ESP_LOGI(GAP_TAG, "Device found: %s", bda2str(param->disc_res.bda, bda_str, 18));
128 for (int i = 0; i < param->disc_res.num_prop; i++) {
129 p = param->disc_res.prop + i;
131 case ESP_BT_GAP_DEV_PROP_COD:
132 cod = *(uint32_t *)(p->val);
133 ESP_LOGI(GAP_TAG, "--Class of Device: 0x%x", cod);
135 case ESP_BT_GAP_DEV_PROP_RSSI:
136 rssi = *(int8_t *)(p->val);
137 ESP_LOGI(GAP_TAG, "--RSSI: %d", rssi);
139 case ESP_BT_GAP_DEV_PROP_BDNAME:
145 /* search for device with MAJOR service class as "rendering" in COD */
146 app_gap_cb_t *p_dev = &m_dev_info;
147 if (p_dev->dev_found && 0 != memcmp(param->disc_res.bda, p_dev->bda, ESP_BD_ADDR_LEN)) {
151 if (!esp_bt_gap_is_valid_cod(cod) ||
152 !(esp_bt_gap_get_cod_major_dev(cod) == ESP_BT_COD_MAJOR_DEV_PHONE)) {
156 memcpy(p_dev->bda, param->disc_res.bda, ESP_BD_ADDR_LEN);
157 p_dev->dev_found = true;
158 for (int i = 0; i < param->disc_res.num_prop; i++) {
159 p = param->disc_res.prop + i;
161 case ESP_BT_GAP_DEV_PROP_COD:
162 p_dev->cod = *(uint32_t *)(p->val);
164 case ESP_BT_GAP_DEV_PROP_RSSI:
165 p_dev->rssi = *(int8_t *)(p->val);
167 case ESP_BT_GAP_DEV_PROP_BDNAME: {
168 uint8_t len = (p->len > ESP_BT_GAP_MAX_BDNAME_LEN) ? ESP_BT_GAP_MAX_BDNAME_LEN :
170 memcpy(p_dev->bdname, (uint8_t *)(p->val), len);
171 p_dev->bdname[len] = '\0';
172 p_dev->bdname_len = len;
175 case ESP_BT_GAP_DEV_PROP_EIR: {
176 memcpy(p_dev->eir, (uint8_t *)(p->val), p->len);
177 p_dev->eir_len = p->len;
185 if (p_dev->eir && p_dev->bdname_len == 0) {
186 get_name_from_eir(p_dev->eir, p_dev->bdname, &p_dev->bdname_len);
187 ESP_LOGI(GAP_TAG, "Found a target device, address %s, name %s", bda_str, p_dev->bdname);
188 p_dev->state = APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE;
189 ESP_LOGI(GAP_TAG, "Cancel device discovery ...");
190 esp_bt_gap_cancel_discovery();
194 void bt_app_gap_init(void)
196 app_gap_cb_t *p_dev = &m_dev_info;
197 memset(p_dev, 0, sizeof(app_gap_cb_t));
200 void bt_app_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)
202 app_gap_cb_t *p_dev = &m_dev_info;
207 case ESP_BT_GAP_DISC_RES_EVT: {
208 update_device_info(param);
211 case ESP_BT_GAP_DISC_STATE_CHANGED_EVT: {
212 if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STOPPED) {
213 ESP_LOGI(GAP_TAG, "Device discovery stopped.");
214 if ( (p_dev->state == APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE ||
215 p_dev->state == APP_GAP_STATE_DEVICE_DISCOVERING)
216 && p_dev->dev_found) {
217 p_dev->state = APP_GAP_STATE_SERVICE_DISCOVERING;
218 ESP_LOGI(GAP_TAG, "Discover services ...");
219 esp_bt_gap_get_remote_services(p_dev->bda);
221 } else if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STARTED) {
222 ESP_LOGI(GAP_TAG, "Discovery started.");
226 case ESP_BT_GAP_RMT_SRVCS_EVT: {
227 if (memcmp(param->rmt_srvcs.bda, p_dev->bda, ESP_BD_ADDR_LEN) == 0 &&
228 p_dev->state == APP_GAP_STATE_SERVICE_DISCOVERING) {
229 p_dev->state = APP_GAP_STATE_SERVICE_DISCOVER_COMPLETE;
230 if (param->rmt_srvcs.stat == ESP_BT_STATUS_SUCCESS) {
231 ESP_LOGI(GAP_TAG, "Services for device %s found", bda2str(p_dev->bda, bda_str, 18));
232 for (int i = 0; i < param->rmt_srvcs.num_uuids; i++) {
233 esp_bt_uuid_t *u = param->rmt_srvcs.uuid_list + i;
234 ESP_LOGI(GAP_TAG, "--%s", uuid2str(u, uuid_str, 37));
235 // ESP_LOGI(GAP_TAG, "--%d", u->len);
238 ESP_LOGI(GAP_TAG, "Services for device %s not found", bda2str(p_dev->bda, bda_str, 18));
243 case ESP_BT_GAP_RMT_SRVC_REC_EVT:
245 ESP_LOGI(GAP_TAG, "event: %d", event);
252 void bt_app_gap_start_up(void)
254 char *dev_name = "ESP_GAP_INQRUIY";
255 esp_bt_dev_set_device_name(dev_name);
257 /* set discoverable and connectable mode, wait to be connected */
258 esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);
260 /* register GAP callback function */
261 esp_bt_gap_register_callback(bt_app_gap_cb);
263 /* inititialize device information and status */
264 app_gap_cb_t *p_dev = &m_dev_info;
265 memset(p_dev, 0, sizeof(app_gap_cb_t));
267 /* start to discover nearby Bluetooth devices */
268 p_dev->state = APP_GAP_STATE_DEVICE_DISCOVERING;
269 esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, 10, 0);
274 /* Initialize NVS — it is used to store PHY calibration data */
275 esp_err_t ret = nvs_flash_init();
276 if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
277 ESP_ERROR_CHECK(nvs_flash_erase());
278 ret = nvs_flash_init();
280 ESP_ERROR_CHECK( ret );
282 esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
283 if ((ret = esp_bt_controller_init(&bt_cfg)) != ESP_OK) {
284 ESP_LOGE(GAP_TAG, "%s initialize controller failed: %s\n", __func__, esp_err_to_name(ret));
288 if ((ret = esp_bt_controller_enable(ESP_BT_MODE_BTDM)) != ESP_OK) {
289 ESP_LOGE(GAP_TAG, "%s enable controller failed: %s\n", __func__, esp_err_to_name(ret));
293 if ((ret = esp_bluedroid_init()) != ESP_OK) {
294 ESP_LOGE(GAP_TAG, "%s initialize bluedroid failed: %s\n", __func__, esp_err_to_name(ret));
298 if ((ret = esp_bluedroid_enable()) != ESP_OK) {
299 ESP_LOGE(GAP_TAG, "%s enable bluedroid failed: %s\n", __func__, esp_err_to_name(ret));
303 bt_app_gap_start_up();