307 lines
9.5 KiB
C
307 lines
9.5 KiB
C
/*
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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/****************************************************************************
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*
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* This file is for Classic Bluetooth device and service discovery Demo.
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*
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****************************************************************************/
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#include <stdint.h>
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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "nvs.h"
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#include "nvs_flash.h"
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#include "esp_system.h"
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#include "esp_log.h"
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#include "esp_bt.h"
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#include "esp_bt_main.h"
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#include "esp_bt_device.h"
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#include "esp_gap_bt_api.h"
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#define GAP_TAG "GAP"
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typedef enum {
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APP_GAP_STATE_IDLE = 0,
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APP_GAP_STATE_DEVICE_DISCOVERING,
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APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE,
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APP_GAP_STATE_SERVICE_DISCOVERING,
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APP_GAP_STATE_SERVICE_DISCOVER_COMPLETE,
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} app_gap_state_t;
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typedef struct {
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bool dev_found;
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uint8_t bdname_len;
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uint8_t eir_len;
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uint8_t rssi;
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uint32_t cod;
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uint8_t eir[ESP_BT_GAP_EIR_DATA_LEN];
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uint8_t bdname[ESP_BT_GAP_MAX_BDNAME_LEN + 1];
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esp_bd_addr_t bda;
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app_gap_state_t state;
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} app_gap_cb_t;
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static app_gap_cb_t m_dev_info;
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static char *bda2str(esp_bd_addr_t bda, char *str, size_t size)
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{
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if (bda == NULL || str == NULL || size < 18) {
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return NULL;
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}
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uint8_t *p = bda;
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sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
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p[0], p[1], p[2], p[3], p[4], p[5]);
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return str;
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}
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static char *uuid2str(esp_bt_uuid_t *uuid, char *str, size_t size)
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{
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if (uuid == NULL || str == NULL) {
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return NULL;
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}
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if (uuid->len == 2 && size >= 5) {
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sprintf(str, "%04x", uuid->uuid.uuid16);
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} else if (uuid->len == 4 && size >= 9) {
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sprintf(str, "%08x", uuid->uuid.uuid32);
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} else if (uuid->len == 16 && size >= 37) {
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uint8_t *p = uuid->uuid.uuid128;
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sprintf(str, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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p[15], p[14], p[13], p[12], p[11], p[10], p[9], p[8],
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p[7], p[6], p[5], p[4], p[3], p[2], p[1], p[0]);
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} else {
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return NULL;
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}
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return str;
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}
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static bool get_name_from_eir(uint8_t *eir, uint8_t *bdname, uint8_t *bdname_len)
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{
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uint8_t *rmt_bdname = NULL;
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uint8_t rmt_bdname_len = 0;
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if (!eir) {
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return false;
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}
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rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_CMPL_LOCAL_NAME, &rmt_bdname_len);
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if (!rmt_bdname) {
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rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_SHORT_LOCAL_NAME, &rmt_bdname_len);
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}
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if (rmt_bdname) {
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if (rmt_bdname_len > ESP_BT_GAP_MAX_BDNAME_LEN) {
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rmt_bdname_len = ESP_BT_GAP_MAX_BDNAME_LEN;
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}
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if (bdname) {
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memcpy(bdname, rmt_bdname, rmt_bdname_len);
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bdname[rmt_bdname_len] = '\0';
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}
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if (bdname_len) {
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*bdname_len = rmt_bdname_len;
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}
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return true;
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}
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return false;
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}
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static void update_device_info(esp_bt_gap_cb_param_t *param)
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{
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char bda_str[18];
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uint32_t cod = 0;
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int32_t rssi = -129; /* invalid value */
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esp_bt_gap_dev_prop_t *p;
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ESP_LOGI(GAP_TAG, "Device found: %s", bda2str(param->disc_res.bda, bda_str, 18));
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for (int i = 0; i < param->disc_res.num_prop; i++) {
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p = param->disc_res.prop + i;
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switch (p->type) {
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case ESP_BT_GAP_DEV_PROP_COD:
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cod = *(uint32_t *)(p->val);
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ESP_LOGI(GAP_TAG, "--Class of Device: 0x%x", cod);
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break;
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case ESP_BT_GAP_DEV_PROP_RSSI:
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rssi = *(int8_t *)(p->val);
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ESP_LOGI(GAP_TAG, "--RSSI: %d", rssi);
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break;
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case ESP_BT_GAP_DEV_PROP_BDNAME:
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default:
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break;
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}
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}
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/* search for device with MAJOR service class as "rendering" in COD */
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app_gap_cb_t *p_dev = &m_dev_info;
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if (p_dev->dev_found && 0 != memcmp(param->disc_res.bda, p_dev->bda, ESP_BD_ADDR_LEN)) {
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return;
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}
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if (!esp_bt_gap_is_valid_cod(cod) ||
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!(esp_bt_gap_get_cod_major_dev(cod) == ESP_BT_COD_MAJOR_DEV_PHONE)) {
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return;
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}
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memcpy(p_dev->bda, param->disc_res.bda, ESP_BD_ADDR_LEN);
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p_dev->dev_found = true;
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for (int i = 0; i < param->disc_res.num_prop; i++) {
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p = param->disc_res.prop + i;
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switch (p->type) {
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case ESP_BT_GAP_DEV_PROP_COD:
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p_dev->cod = *(uint32_t *)(p->val);
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break;
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case ESP_BT_GAP_DEV_PROP_RSSI:
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p_dev->rssi = *(int8_t *)(p->val);
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break;
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case ESP_BT_GAP_DEV_PROP_BDNAME: {
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uint8_t len = (p->len > ESP_BT_GAP_MAX_BDNAME_LEN) ? ESP_BT_GAP_MAX_BDNAME_LEN :
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(uint8_t)p->len;
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memcpy(p_dev->bdname, (uint8_t *)(p->val), len);
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p_dev->bdname[len] = '\0';
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p_dev->bdname_len = len;
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break;
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}
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case ESP_BT_GAP_DEV_PROP_EIR: {
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memcpy(p_dev->eir, (uint8_t *)(p->val), p->len);
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p_dev->eir_len = p->len;
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break;
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}
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default:
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break;
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}
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}
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if (p_dev->eir && p_dev->bdname_len == 0) {
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get_name_from_eir(p_dev->eir, p_dev->bdname, &p_dev->bdname_len);
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ESP_LOGI(GAP_TAG, "Found a target device, address %s, name %s", bda_str, p_dev->bdname);
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p_dev->state = APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE;
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ESP_LOGI(GAP_TAG, "Cancel device discovery ...");
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esp_bt_gap_cancel_discovery();
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}
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}
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void bt_app_gap_init(void)
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{
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app_gap_cb_t *p_dev = &m_dev_info;
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memset(p_dev, 0, sizeof(app_gap_cb_t));
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}
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void bt_app_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)
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{
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app_gap_cb_t *p_dev = &m_dev_info;
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char bda_str[18];
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char uuid_str[37];
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switch (event) {
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case ESP_BT_GAP_DISC_RES_EVT: {
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update_device_info(param);
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break;
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}
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case ESP_BT_GAP_DISC_STATE_CHANGED_EVT: {
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if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STOPPED) {
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ESP_LOGI(GAP_TAG, "Device discovery stopped.");
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if ( (p_dev->state == APP_GAP_STATE_DEVICE_DISCOVER_COMPLETE ||
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p_dev->state == APP_GAP_STATE_DEVICE_DISCOVERING)
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&& p_dev->dev_found) {
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p_dev->state = APP_GAP_STATE_SERVICE_DISCOVERING;
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ESP_LOGI(GAP_TAG, "Discover services ...");
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esp_bt_gap_get_remote_services(p_dev->bda);
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}
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} else if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STARTED) {
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ESP_LOGI(GAP_TAG, "Discovery started.");
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}
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break;
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}
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case ESP_BT_GAP_RMT_SRVCS_EVT: {
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if (memcmp(param->rmt_srvcs.bda, p_dev->bda, ESP_BD_ADDR_LEN) == 0 &&
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p_dev->state == APP_GAP_STATE_SERVICE_DISCOVERING) {
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p_dev->state = APP_GAP_STATE_SERVICE_DISCOVER_COMPLETE;
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if (param->rmt_srvcs.stat == ESP_BT_STATUS_SUCCESS) {
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ESP_LOGI(GAP_TAG, "Services for device %s found", bda2str(p_dev->bda, bda_str, 18));
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for (int i = 0; i < param->rmt_srvcs.num_uuids; i++) {
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esp_bt_uuid_t *u = param->rmt_srvcs.uuid_list + i;
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ESP_LOGI(GAP_TAG, "--%s", uuid2str(u, uuid_str, 37));
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// ESP_LOGI(GAP_TAG, "--%d", u->len);
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}
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} else {
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ESP_LOGI(GAP_TAG, "Services for device %s not found", bda2str(p_dev->bda, bda_str, 18));
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}
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}
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break;
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}
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case ESP_BT_GAP_RMT_SRVC_REC_EVT:
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default: {
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ESP_LOGI(GAP_TAG, "event: %d", event);
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break;
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}
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}
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return;
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}
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void bt_app_gap_start_up(void)
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{
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char *dev_name = "ESP_GAP_INQRUIY";
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esp_bt_dev_set_device_name(dev_name);
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/* set discoverable and connectable mode, wait to be connected */
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esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);
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/* register GAP callback function */
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esp_bt_gap_register_callback(bt_app_gap_cb);
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/* inititialize device information and status */
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app_gap_cb_t *p_dev = &m_dev_info;
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memset(p_dev, 0, sizeof(app_gap_cb_t));
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/* start to discover nearby Bluetooth devices */
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p_dev->state = APP_GAP_STATE_DEVICE_DISCOVERING;
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esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, 10, 0);
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}
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void app_main()
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{
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/* Initialize NVS — it is used to store PHY calibration data */
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esp_err_t ret = nvs_flash_init();
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if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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ESP_ERROR_CHECK(nvs_flash_erase());
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ret = nvs_flash_init();
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}
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ESP_ERROR_CHECK( ret );
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ESP_ERROR_CHECK(esp_bt_controller_mem_release(ESP_BT_MODE_BLE));
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esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
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if ((ret = esp_bt_controller_init(&bt_cfg)) != ESP_OK) {
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ESP_LOGE(GAP_TAG, "%s initialize controller failed: %s\n", __func__, esp_err_to_name(ret));
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return;
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}
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if ((ret = esp_bt_controller_enable(ESP_BT_MODE_CLASSIC_BT)) != ESP_OK) {
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ESP_LOGE(GAP_TAG, "%s enable controller failed: %s\n", __func__, esp_err_to_name(ret));
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return;
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}
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if ((ret = esp_bluedroid_init()) != ESP_OK) {
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ESP_LOGE(GAP_TAG, "%s initialize bluedroid failed: %s\n", __func__, esp_err_to_name(ret));
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return;
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}
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if ((ret = esp_bluedroid_enable()) != ESP_OK) {
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ESP_LOGE(GAP_TAG, "%s enable bluedroid failed: %s\n", __func__, esp_err_to_name(ret));
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return;
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}
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bt_app_gap_start_up();
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}
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