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#include "dpp_wifi.h"
static void event_handler(void *arg, esp_event_base_t event_base,
int32_t event_id, void *event_data)
{
if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
ESP_ERROR_CHECK(esp_supp_dpp_start_listen());
ESP_LOGI(WIFI_TAG, "Started listening for DPP Authentication");
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
if (s_retry_num < WIFI_MAX_RETRY_NUM) {
esp_wifi_connect();
s_retry_num++;
ESP_LOGI(WIFI_TAG, "retry to connect to the AP");
} else {
xEventGroupSetBits(s_dpp_event_group, DPP_CONNECT_FAIL_BIT);
}
ESP_LOGI(WIFI_TAG, "connect to the AP fail");
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_CONNECTED) {
ESP_LOGI(WIFI_TAG, "Successfully connected to the AP ssid : %s ", s_dpp_wifi_configuration.sta.ssid);
} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
ip_event_got_ip_t *event = (ip_event_got_ip_t *) event_data;
ESP_LOGI(WIFI_TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
s_retry_num = 0;
xEventGroupSetBits(s_dpp_event_group, DPP_CONNECTED_BIT);
}
}
void dpp_enrollee_event_cb(esp_supp_dpp_event_t event, void *data)
{
switch (event) {
case ESP_SUPP_DPP_URI_READY:
if (data != NULL) {
esp_qrcode_config_t cfg = ESP_QRCODE_CONFIG_DEFAULT();
ESP_LOGI(WIFI_TAG, "Scan below QR Code to configure the enrollee:");
esp_qrcode_generate(&cfg, (const char *)data);
}
break;
case ESP_SUPP_DPP_CFG_RECVD:
memcpy(&s_dpp_wifi_configuration, data, sizeof(s_dpp_wifi_configuration));
s_retry_num = 0;
esp_wifi_set_config(ESP_IF_WIFI_STA, &s_dpp_wifi_configuration);
esp_wifi_connect();
break;
case ESP_SUPP_DPP_FAIL:
if (s_retry_num < 5) {
ESP_LOGI(WIFI_TAG, "DPP Auth failed (Reason: %s), retry...", esp_err_to_name((int)data));
ESP_ERROR_CHECK(esp_supp_dpp_start_listen());
s_retry_num++;
} else {
xEventGroupSetBits(s_dpp_event_group, DPP_AUTH_FAIL_BIT);
}
break;
default:
break;
}
}
esp_err_t dpp_enrollee_bootstrap(void)
{
esp_err_t ret;
size_t pkey_len = strlen(EXAMPLE_DPP_BOOTSTRAPPING_KEY);
char *key = NULL;
if (pkey_len) {
/* Currently only NIST P-256 curve is supported, add prefix/postfix accordingly */
char prefix[] = "30310201010420";
char postfix[] = "a00a06082a8648ce3d030107";
if (pkey_len != CURVE_SEC256R1_PKEY_HEX_DIGITS) {
ESP_LOGI(WIFI_TAG, "Invalid key length! Private key needs to be 32 bytes (or 64 hex digits) long");
return ESP_FAIL;
}
key = malloc(sizeof(prefix) + pkey_len + sizeof(postfix));
if (!key) {
ESP_LOGI(WIFI_TAG, "Failed to allocate for bootstrapping key");
return ESP_ERR_NO_MEM;
}
sprintf(key, "%s%s%s", prefix, EXAMPLE_DPP_BOOTSTRAPPING_KEY, postfix);
}
/* Currently only supported method is QR Code */
ret = esp_supp_dpp_bootstrap_gen(EXAMPLE_DPP_LISTEN_CHANNEL_LIST, DPP_BOOTSTRAP_QR_CODE,
key, EXAMPLE_DPP_DEVICE_INFO);
if (key)
free(key);
return ret;
}
void save_wifi_configuration(const uint8_t *ssid, const uint8_t *psk) {
nvs_handle_t handle;
ESP_ERROR_CHECK(nvs_open("wifi_creds", NVS_READWRITE, &handle));
// Save SSID
ESP_ERROR_CHECK(nvs_set_str(handle, "ssid", (const char *)ssid));
// Save PSK
ESP_ERROR_CHECK(nvs_set_str(handle, "psk", (const char *)psk));
// Commit the changes
ESP_ERROR_CHECK(nvs_commit(handle));
// Close the handle
nvs_close(handle);
}
bool load_wifi_configuration() {
nvs_handle_t handle;
esp_err_t err = nvs_open("wifi_creds", NVS_READONLY, &handle);
if (err != ESP_OK) {
// Handle error opening NVS
return false; // Indicates failure to load credentials
}
// Initialize ssid and psk fields in the struct
memset(&s_dpp_wifi_configuration, 0, sizeof(s_dpp_wifi_configuration));
// Read SSID
size_t ssid_size = sizeof(s_dpp_wifi_configuration.sta.ssid);
if (nvs_get_str(handle, "ssid", (char *)s_dpp_wifi_configuration.sta.ssid, &ssid_size) != ESP_OK || strlen((char *)s_dpp_wifi_configuration.sta.ssid) == 0) {
nvs_close(handle);
return false; // Indicates no valid SSID stored
}
// Read PSK
size_t psk_size = sizeof(s_dpp_wifi_configuration.sta.password);
if (nvs_get_str(handle, "psk", (char *)s_dpp_wifi_configuration.sta.password, &psk_size) != ESP_OK || strlen((char *)s_dpp_wifi_configuration.sta.password) == 0) {
nvs_close(handle);
return false; // Indicates no valid PSK stored
}
// Close the handle
nvs_close(handle);
return true; // Indicates valid credentials loaded
}
void dpp_enrollee_init(void)
{
s_dpp_event_group = xEventGroupCreate();
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
esp_netif_create_default_wifi_sta();
ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL));
ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_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));
ESP_ERROR_CHECK(esp_supp_dpp_init(dpp_enrollee_event_cb));
ESP_ERROR_CHECK(dpp_enrollee_bootstrap());
ESP_ERROR_CHECK(esp_wifi_start());
/* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
* number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
EventBits_t bits = xEventGroupWaitBits(s_dpp_event_group,
DPP_CONNECTED_BIT | DPP_CONNECT_FAIL_BIT | DPP_AUTH_FAIL_BIT,
pdFALSE,
pdFALSE,
portMAX_DELAY);
/* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually
* happened. */
if (bits & DPP_CONNECTED_BIT) {
ESP_LOGI(WIFI_TAG, "connected to ap SSID:%s",
s_dpp_wifi_configuration.sta.ssid);
save_wifi_configuration(s_dpp_wifi_configuration.sta.ssid, s_dpp_wifi_configuration.sta.password);
} else if (bits & DPP_CONNECT_FAIL_BIT) {
ESP_LOGI(WIFI_TAG, "Failed to connect to SSID:%s",
s_dpp_wifi_configuration.sta.ssid);
} else if (bits & DPP_AUTH_FAIL_BIT) {
ESP_LOGI(WIFI_TAG, "DPP Authentication failed after %d retries", s_retry_num);
} else {
ESP_LOGE(WIFI_TAG, "UNEXPECTED EVENT");
}
esp_supp_dpp_deinit();
ESP_ERROR_CHECK(esp_event_handler_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler));
//ESP_ERROR_CHECK(esp_event_handler_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler));
vEventGroupDelete(s_dpp_event_group);
}
void launch_dpp(void)
{
if (load_wifi_configuration()) {
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
esp_netif_create_default_wifi_sta();
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));
ESP_ERROR_CHECK(esp_wifi_start());
// Use the configuration to connect to Wi-Fi
ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL));
esp_wifi_set_config(ESP_IF_WIFI_STA, &s_dpp_wifi_configuration);
if(esp_wifi_connect() != ESP_OK) // Connect to the network
{
ESP_LOGI(WIFI_TAG, "No valid Wi-Fi credentials stored.");
ESP_LOGI(WIFI_TAG, "Initiating dpp...");
dpp_enrollee_init();
}
} else {
// No valid Wi-Fi credentials found
ESP_LOGI(WIFI_TAG, "No valid Wi-Fi credentials stored.");
ESP_LOGI(WIFI_TAG, "Initiating dpp...");
dpp_enrollee_init();
}
}
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