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esp-idf/examples/bluetooth/blufi/main/blufi_example_main.c

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/*
* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
/****************************************************************************
* This is a demo for bluetooth config wifi connection to ap. You can config ESP32 to connect a softap
* or config ESP32 as a softap to be connected by other device. APP can be downloaded from github
* android source code: https://github.com/EspressifApp/EspBlufi
* iOS source code: https://github.com/EspressifApp/EspBlufiForiOS
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_mac.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "esp_log.h"
#include "nvs_flash.h"
#if CONFIG_BT_CONTROLLER_ENABLED || !CONFIG_BT_NIMBLE_ENABLED
#include "esp_bt.h"
#endif
#include "esp_blufi_api.h"
#include "blufi_example.h"
#include "esp_blufi.h"
#define EXAMPLE_WIFI_CONNECTION_MAXIMUM_RETRY CONFIG_EXAMPLE_WIFI_CONNECTION_MAXIMUM_RETRY
#define EXAMPLE_INVALID_REASON 255
#define EXAMPLE_INVALID_RSSI -128
static void example_event_callback(esp_blufi_cb_event_t event, esp_blufi_cb_param_t *param);
#define WIFI_LIST_NUM 10
static wifi_config_t sta_config;
static wifi_config_t ap_config;
/* FreeRTOS event group to signal when we are connected & ready to make a request */
static EventGroupHandle_t wifi_event_group;
/* The event group allows multiple bits for each event,
but we only care about one event - are we connected
to the AP with an IP? */
const int CONNECTED_BIT = BIT0;
static uint8_t example_wifi_retry = 0;
/* store the station info for send back to phone */
static bool gl_sta_connected = false;
static bool gl_sta_got_ip = false;
static bool ble_is_connected = false;
static uint8_t gl_sta_bssid[6];
static uint8_t gl_sta_ssid[32];
static int gl_sta_ssid_len;
static wifi_sta_list_t gl_sta_list;
static bool gl_sta_is_connecting = false;
static esp_blufi_extra_info_t gl_sta_conn_info;
static void example_record_wifi_conn_info(int rssi, uint8_t reason)
{
memset(&gl_sta_conn_info, 0, sizeof(esp_blufi_extra_info_t));
if (gl_sta_is_connecting) {
gl_sta_conn_info.sta_max_conn_retry_set = true;
gl_sta_conn_info.sta_max_conn_retry = EXAMPLE_WIFI_CONNECTION_MAXIMUM_RETRY;
} else {
gl_sta_conn_info.sta_conn_rssi_set = true;
gl_sta_conn_info.sta_conn_rssi = rssi;
gl_sta_conn_info.sta_conn_end_reason_set = true;
gl_sta_conn_info.sta_conn_end_reason = reason;
}
}
static void example_wifi_connect(void)
{
example_wifi_retry = 0;
gl_sta_is_connecting = (esp_wifi_connect() == ESP_OK);
example_record_wifi_conn_info(EXAMPLE_INVALID_RSSI, EXAMPLE_INVALID_REASON);
}
static bool example_wifi_reconnect(void)
{
bool ret;
if (gl_sta_is_connecting && example_wifi_retry++ < EXAMPLE_WIFI_CONNECTION_MAXIMUM_RETRY) {
BLUFI_INFO("BLUFI WiFi starts reconnection\n");
gl_sta_is_connecting = (esp_wifi_connect() == ESP_OK);
example_record_wifi_conn_info(EXAMPLE_INVALID_RSSI, EXAMPLE_INVALID_REASON);
ret = true;
} else {
ret = false;
}
return ret;
}
static int softap_get_current_connection_number(void)
{
esp_err_t ret;
ret = esp_wifi_ap_get_sta_list(&gl_sta_list);
if (ret == ESP_OK)
{
return gl_sta_list.num;
}
return 0;
}
static void ip_event_handler(void* arg, esp_event_base_t event_base,
int32_t event_id, void* event_data)
{
wifi_mode_t mode;
switch (event_id) {
case IP_EVENT_STA_GOT_IP: {
esp_blufi_extra_info_t info;
xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
esp_wifi_get_mode(&mode);
memset(&info, 0, sizeof(esp_blufi_extra_info_t));
memcpy(info.sta_bssid, gl_sta_bssid, 6);
info.sta_bssid_set = true;
info.sta_ssid = gl_sta_ssid;
info.sta_ssid_len = gl_sta_ssid_len;
gl_sta_got_ip = true;
if (ble_is_connected == true) {
esp_blufi_send_wifi_conn_report(mode, ESP_BLUFI_STA_CONN_SUCCESS, softap_get_current_connection_number(), &info);
} else {
BLUFI_INFO("BLUFI BLE is not connected yet\n");
}
break;
}
default:
break;
}
return;
}
static void wifi_event_handler(void* arg, esp_event_base_t event_base,
int32_t event_id, void* event_data)
{
wifi_event_sta_connected_t *event;
wifi_event_sta_disconnected_t *disconnected_event;
wifi_mode_t mode;
switch (event_id) {
case WIFI_EVENT_STA_START:
example_wifi_connect();
break;
case WIFI_EVENT_STA_CONNECTED:
gl_sta_connected = true;
gl_sta_is_connecting = false;
event = (wifi_event_sta_connected_t*) event_data;
memcpy(gl_sta_bssid, event->bssid, 6);
memcpy(gl_sta_ssid, event->ssid, event->ssid_len);
gl_sta_ssid_len = event->ssid_len;
break;
case WIFI_EVENT_STA_DISCONNECTED:
/* Only handle reconnection during connecting */
if (gl_sta_connected == false && example_wifi_reconnect() == false) {
gl_sta_is_connecting = false;
disconnected_event = (wifi_event_sta_disconnected_t*) event_data;
example_record_wifi_conn_info(disconnected_event->rssi, disconnected_event->reason);
}
/* This is a workaround as ESP32 WiFi libs don't currently
auto-reassociate. */
gl_sta_connected = false;
gl_sta_got_ip = false;
memset(gl_sta_ssid, 0, 32);
memset(gl_sta_bssid, 0, 6);
gl_sta_ssid_len = 0;
xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
break;
case WIFI_EVENT_AP_START:
esp_wifi_get_mode(&mode);
/* TODO: get config or information of softap, then set to report extra_info */
if (ble_is_connected == true) {
if (gl_sta_connected) {
esp_blufi_extra_info_t info;
memset(&info, 0, sizeof(esp_blufi_extra_info_t));
memcpy(info.sta_bssid, gl_sta_bssid, 6);
info.sta_bssid_set = true;
info.sta_ssid = gl_sta_ssid;
info.sta_ssid_len = gl_sta_ssid_len;
esp_blufi_send_wifi_conn_report(mode, gl_sta_got_ip ? ESP_BLUFI_STA_CONN_SUCCESS : ESP_BLUFI_STA_NO_IP, softap_get_current_connection_number(), &info);
} else if (gl_sta_is_connecting) {
esp_blufi_send_wifi_conn_report(mode, ESP_BLUFI_STA_CONNECTING, softap_get_current_connection_number(), &gl_sta_conn_info);
} else {
esp_blufi_send_wifi_conn_report(mode, ESP_BLUFI_STA_CONN_FAIL, softap_get_current_connection_number(), &gl_sta_conn_info);
}
} else {
BLUFI_INFO("BLUFI BLE is not connected yet\n");
}
break;
case WIFI_EVENT_SCAN_DONE: {
uint16_t apCount = 0;
esp_wifi_scan_get_ap_num(&apCount);
if (apCount == 0) {
BLUFI_INFO("Nothing AP found");
break;
}
wifi_ap_record_t *ap_list = (wifi_ap_record_t *)malloc(sizeof(wifi_ap_record_t) * apCount);
if (!ap_list) {
BLUFI_ERROR("malloc error, ap_list is NULL");
esp_wifi_clear_ap_list();
break;
}
ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&apCount, ap_list));
esp_blufi_ap_record_t * blufi_ap_list = (esp_blufi_ap_record_t *)malloc(apCount * sizeof(esp_blufi_ap_record_t));
if (!blufi_ap_list) {
if (ap_list) {
free(ap_list);
}
BLUFI_ERROR("malloc error, blufi_ap_list is NULL");
break;
}
for (int i = 0; i < apCount; ++i)
{
blufi_ap_list[i].rssi = ap_list[i].rssi;
memcpy(blufi_ap_list[i].ssid, ap_list[i].ssid, sizeof(ap_list[i].ssid));
}
if (ble_is_connected == true) {
esp_blufi_send_wifi_list(apCount, blufi_ap_list);
} else {
BLUFI_INFO("BLUFI BLE is not connected yet\n");
}
esp_wifi_scan_stop();
free(ap_list);
free(blufi_ap_list);
break;
}
case WIFI_EVENT_AP_STACONNECTED: {
wifi_event_ap_staconnected_t* event = (wifi_event_ap_staconnected_t*) event_data;
BLUFI_INFO("station "MACSTR" join, AID=%d", MAC2STR(event->mac), event->aid);
break;
}
case WIFI_EVENT_AP_STADISCONNECTED: {
wifi_event_ap_stadisconnected_t* event = (wifi_event_ap_stadisconnected_t*) event_data;
BLUFI_INFO("station "MACSTR" leave, AID=%d", MAC2STR(event->mac), event->aid);
break;
}
default:
break;
}
return;
}
static void initialise_wifi(void)
{
ESP_ERROR_CHECK(esp_netif_init());
wifi_event_group = xEventGroupCreate();
ESP_ERROR_CHECK(esp_event_loop_create_default());
esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();
assert(sta_netif);
esp_netif_t *ap_netif = esp_netif_create_default_wifi_ap();
assert(ap_netif);
ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &wifi_event_handler, NULL));
ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &ip_event_handler, NULL));
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
example_record_wifi_conn_info(EXAMPLE_INVALID_RSSI, EXAMPLE_INVALID_REASON);
ESP_ERROR_CHECK( esp_wifi_start() );
}
static esp_blufi_callbacks_t example_callbacks = {
.event_cb = example_event_callback,
.negotiate_data_handler = blufi_dh_negotiate_data_handler,
.encrypt_func = blufi_aes_encrypt,
.decrypt_func = blufi_aes_decrypt,
.checksum_func = blufi_crc_checksum,
};
static void example_event_callback(esp_blufi_cb_event_t event, esp_blufi_cb_param_t *param)
{
/* actually, should post to blufi_task handle the procedure,
* now, as a example, we do it more simply */
switch (event) {
case ESP_BLUFI_EVENT_INIT_FINISH:
BLUFI_INFO("BLUFI init finish\n");
esp_blufi_adv_start();
break;
case ESP_BLUFI_EVENT_DEINIT_FINISH:
BLUFI_INFO("BLUFI deinit finish\n");
break;
case ESP_BLUFI_EVENT_BLE_CONNECT:
BLUFI_INFO("BLUFI ble connect\n");
ble_is_connected = true;
esp_blufi_adv_stop();
blufi_security_init();
break;
case ESP_BLUFI_EVENT_BLE_DISCONNECT:
BLUFI_INFO("BLUFI ble disconnect\n");
ble_is_connected = false;
blufi_security_deinit();
esp_blufi_adv_start();
break;
case ESP_BLUFI_EVENT_SET_WIFI_OPMODE:
BLUFI_INFO("BLUFI Set WIFI opmode %d\n", param->wifi_mode.op_mode);
ESP_ERROR_CHECK( esp_wifi_set_mode(param->wifi_mode.op_mode) );
break;
case ESP_BLUFI_EVENT_REQ_CONNECT_TO_AP:
BLUFI_INFO("BLUFI requset wifi connect to AP\n");
/* there is no wifi callback when the device has already connected to this wifi
so disconnect wifi before connection.
*/
esp_wifi_disconnect();
example_wifi_connect();
break;
case ESP_BLUFI_EVENT_REQ_DISCONNECT_FROM_AP:
BLUFI_INFO("BLUFI requset wifi disconnect from AP\n");
esp_wifi_disconnect();
break;
case ESP_BLUFI_EVENT_REPORT_ERROR:
BLUFI_ERROR("BLUFI report error, error code %d\n", param->report_error.state);
esp_blufi_send_error_info(param->report_error.state);
break;
case ESP_BLUFI_EVENT_GET_WIFI_STATUS: {
wifi_mode_t mode;
esp_blufi_extra_info_t info;
esp_wifi_get_mode(&mode);
if (gl_sta_connected) {
memset(&info, 0, sizeof(esp_blufi_extra_info_t));
memcpy(info.sta_bssid, gl_sta_bssid, 6);
info.sta_bssid_set = true;
info.sta_ssid = gl_sta_ssid;
info.sta_ssid_len = gl_sta_ssid_len;
esp_blufi_send_wifi_conn_report(mode, gl_sta_got_ip ? ESP_BLUFI_STA_CONN_SUCCESS : ESP_BLUFI_STA_NO_IP, softap_get_current_connection_number(), &info);
} else if (gl_sta_is_connecting) {
esp_blufi_send_wifi_conn_report(mode, ESP_BLUFI_STA_CONNECTING, softap_get_current_connection_number(), &gl_sta_conn_info);
} else {
esp_blufi_send_wifi_conn_report(mode, ESP_BLUFI_STA_CONN_FAIL, softap_get_current_connection_number(), &gl_sta_conn_info);
}
BLUFI_INFO("BLUFI get wifi status from AP\n");
break;
}
case ESP_BLUFI_EVENT_RECV_SLAVE_DISCONNECT_BLE:
BLUFI_INFO("blufi close a gatt connection");
esp_blufi_disconnect();
break;
case ESP_BLUFI_EVENT_DEAUTHENTICATE_STA:
/* TODO */
break;
case ESP_BLUFI_EVENT_RECV_STA_BSSID:
memcpy(sta_config.sta.bssid, param->sta_bssid.bssid, 6);
sta_config.sta.bssid_set = 1;
esp_wifi_set_config(WIFI_IF_STA, &sta_config);
BLUFI_INFO("Recv STA BSSID %s\n", sta_config.sta.ssid);
break;
case ESP_BLUFI_EVENT_RECV_STA_SSID:
strncpy((char *)sta_config.sta.ssid, (char *)param->sta_ssid.ssid, param->sta_ssid.ssid_len);
sta_config.sta.ssid[param->sta_ssid.ssid_len] = '\0';
esp_wifi_set_config(WIFI_IF_STA, &sta_config);
BLUFI_INFO("Recv STA SSID %s\n", sta_config.sta.ssid);
break;
case ESP_BLUFI_EVENT_RECV_STA_PASSWD:
strncpy((char *)sta_config.sta.password, (char *)param->sta_passwd.passwd, param->sta_passwd.passwd_len);
sta_config.sta.password[param->sta_passwd.passwd_len] = '\0';
esp_wifi_set_config(WIFI_IF_STA, &sta_config);
BLUFI_INFO("Recv STA PASSWORD %s\n", sta_config.sta.password);
break;
case ESP_BLUFI_EVENT_RECV_SOFTAP_SSID:
strncpy((char *)ap_config.ap.ssid, (char *)param->softap_ssid.ssid, param->softap_ssid.ssid_len);
ap_config.ap.ssid[param->softap_ssid.ssid_len] = '\0';
ap_config.ap.ssid_len = param->softap_ssid.ssid_len;
esp_wifi_set_config(WIFI_IF_AP, &ap_config);
BLUFI_INFO("Recv SOFTAP SSID %s, ssid len %d\n", ap_config.ap.ssid, ap_config.ap.ssid_len);
break;
case ESP_BLUFI_EVENT_RECV_SOFTAP_PASSWD:
strncpy((char *)ap_config.ap.password, (char *)param->softap_passwd.passwd, param->softap_passwd.passwd_len);
ap_config.ap.password[param->softap_passwd.passwd_len] = '\0';
esp_wifi_set_config(WIFI_IF_AP, &ap_config);
BLUFI_INFO("Recv SOFTAP PASSWORD %s len = %d\n", ap_config.ap.password, param->softap_passwd.passwd_len);
break;
case ESP_BLUFI_EVENT_RECV_SOFTAP_MAX_CONN_NUM:
if (param->softap_max_conn_num.max_conn_num > 4) {
return;
}
ap_config.ap.max_connection = param->softap_max_conn_num.max_conn_num;
esp_wifi_set_config(WIFI_IF_AP, &ap_config);
BLUFI_INFO("Recv SOFTAP MAX CONN NUM %d\n", ap_config.ap.max_connection);
break;
case ESP_BLUFI_EVENT_RECV_SOFTAP_AUTH_MODE:
if (param->softap_auth_mode.auth_mode >= WIFI_AUTH_MAX) {
return;
}
ap_config.ap.authmode = param->softap_auth_mode.auth_mode;
esp_wifi_set_config(WIFI_IF_AP, &ap_config);
BLUFI_INFO("Recv SOFTAP AUTH MODE %d\n", ap_config.ap.authmode);
break;
case ESP_BLUFI_EVENT_RECV_SOFTAP_CHANNEL:
if (param->softap_channel.channel > 13) {
return;
}
ap_config.ap.channel = param->softap_channel.channel;
esp_wifi_set_config(WIFI_IF_AP, &ap_config);
BLUFI_INFO("Recv SOFTAP CHANNEL %d\n", ap_config.ap.channel);
break;
case ESP_BLUFI_EVENT_GET_WIFI_LIST:{
wifi_scan_config_t scanConf = {
.ssid = NULL,
.bssid = NULL,
.channel = 0,
.show_hidden = false
};
esp_err_t ret = esp_wifi_scan_start(&scanConf, true);
if (ret != ESP_OK) {
esp_blufi_send_error_info(ESP_BLUFI_WIFI_SCAN_FAIL);
}
break;
}
case ESP_BLUFI_EVENT_RECV_CUSTOM_DATA:
BLUFI_INFO("Recv Custom Data %" PRIu32 "\n", param->custom_data.data_len);
esp_log_buffer_hex("Custom Data", param->custom_data.data, param->custom_data.data_len);
break;
case ESP_BLUFI_EVENT_RECV_USERNAME:
/* Not handle currently */
break;
case ESP_BLUFI_EVENT_RECV_CA_CERT:
/* Not handle currently */
break;
case ESP_BLUFI_EVENT_RECV_CLIENT_CERT:
/* Not handle currently */
break;
case ESP_BLUFI_EVENT_RECV_SERVER_CERT:
/* Not handle currently */
break;
case ESP_BLUFI_EVENT_RECV_CLIENT_PRIV_KEY:
/* Not handle currently */
break;;
case ESP_BLUFI_EVENT_RECV_SERVER_PRIV_KEY:
/* Not handle currently */
break;
default:
break;
}
}
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 );
initialise_wifi();
#if CONFIG_BT_CONTROLLER_ENABLED || !CONFIG_BT_NIMBLE_ENABLED
ret = esp_blufi_controller_init();
if (ret) {
BLUFI_ERROR("%s BLUFI controller init failed: %s\n", __func__, esp_err_to_name(ret));
return;
}
#endif
ret = esp_blufi_host_and_cb_init(&example_callbacks);
if (ret) {
BLUFI_ERROR("%s initialise failed: %s\n", __func__, esp_err_to_name(ret));
return;
}
BLUFI_INFO("BLUFI VERSION %04x\n", esp_blufi_get_version());
}
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