ESP32 connect to WIFI

Hardcode wifi connection

Wi-Fi Station

Add components

Add required components "nvs_flash esp_event esp_wifi":

idf_component_register(SRCS ${SOURCES}
    PRIV_REQUIRES spi_flash
    REQUIRES driver esp_timer esp_lcd nvs_flash esp_event esp_wifi
    INCLUDE_DIRS "include")

Start nvs

void walle::init_flash() {
  esp_err_t ret = nvs_flash_init();
  if (ret == ESP_ERR_NVS_NO_FREE_PAGES ||
      ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
    ESP_LOGW(TAG, "Erasing NVS flash to fix corruption");
    ESP_ERROR_CHECK(nvs_flash_erase());
    ret = nvs_flash_init();
  }
  ESP_ERROR_CHECK(ret);
}

Start wifi

Configure wifi:

void network::init_wifi() {
  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_event_handler_instance_t instance_any_id;
  esp_event_handler_instance_t instance_got_ip;

  // Passed this as data!
  ESP_ERROR_CHECK(esp_event_handler_instance_register(
      WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler_static, this,
      &instance_any_id));
  ESP_ERROR_CHECK(esp_event_handler_instance_register(
      IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler_static, this,
      &instance_got_ip));

  wifi_config_t wifi_config = {
      .sta =
          {
              .ssid = CONFIG_ESP_WIFI_SSID,
              .password = CONFIG_ESP_WIFI_PASSWORD,
              .threshold = {.authmode = WIFI_AUTH_WPA_WPA2_PSK},
              // H2E is more safe, to use old WPA2 device, use WPA3_SAE_PWE_BOTH
              .sae_pwe_h2e = WPA3_SAE_PWE_BOTH,
          },
  };
  ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
  ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
  ESP_ERROR_CHECK(esp_wifi_start());

  ESP_LOGI(TAG, "wifi initialized");
}

Note that since it's cpp, we need to wrap the handler registor:

void network::event_handler_static(void *arg, esp_event_base_t base,
                                   int32_t event_id, void *event_data) {
  network *self = static_cast<network *>(arg);
  if (self) {
    self->event_handler(base, event_id, event_data);
  } else {
    ESP_LOGE(TAG, "failed to cast *arg -> network instance, network handler "
                  "will not work!");
  }
}

Configure wifi via bluetooth

Smart config

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