# Wi-Fi Easy ConnectTM (DPP)

[English]

Wi-Fi Easy ConnectTM 是 Wi-Fi Alliance 认证的配网协议，也称为设备配网协议 (DPP) 或 Easy Connect，是一种安全和标准化的 Wi-Fi 设备配网协议。使用 Easy Connect 将新设备添加入网就像扫描二维码一样简单，特别是对于没有 UI 的智能家居和物联网产品而言，大大降低了联网复杂性，加强了的用户体验。与旧的协议如 Wi-Fi Protected Setup (WPS) 等旧协议相比，Wi-Fi Easy Connect 的公钥加密技术额外确保了添加新设备时的网络安全。

Easy Connect 从以下几个方面改善了用户体验：

> - 操作简单直观，设置新设备时无需阅读冗长的指南

> - 无需记住需配网设备的密码或输入密码

> - 支持电子/打印的二维码以及其他人类可读的字符串

> - 同时支持 WPA2 和 WPA3 网络

如需了解更多信息，请参考 Wi-Fi Alliance 的官方介绍：Easy Connect。

ESP32-C2 支持 Easy Connect 的二维码配网模式，用户需要使用显示器显示二维码，随后使用兼容的设备扫描此二维码，并将 ESP32-C2 添加到自己的 Wi-Fi 网络中。此兼容设备需连接到无需支持 Wi-Fi Easy ConnectTM 的 AP 上。

Easy Connect 协议仍在不断发展。目前已知支持二维码的平台为部分运行 Android 10 及更高系统版本的 Android 智能手机等。使用 Easy Connect 时，无需在智能手机上安装额外的应用程序。

## 应用示例

- wifi/wifi_easy_connect/dpp-enrollee 演示如何使用 DPP 将 ESP32-C2 配置为注册设备，通过二维码和 Android 10 及以上的设备安全地将 ESP 设备接入网络。

## API 参考

### Header File

- components/wpa_supplicant/esp_supplicant/include/esp_dpp.h

- This header file can be included with:

  >     #include "esp_dpp.h"

- This header file is a part of the API provided by the `wpa_supplicant` component. To declare that your component depends on `wpa_supplicant`, add the following to your CMakeLists.txt:

  >     REQUIRES wpa_supplicant

  > or

  >     PRIV_REQUIRES wpa_supplicant

### Functions

esp_err_t esp_supp_dpp_init(esp_supp_dpp_event_cb_t evt_cb)

  Initialize DPP Supplicant.

         Starts DPP Supplicant and initializes related Data Structures.

  return

  - ESP_OK: Success

  - ESP_FAIL: Failure

  备注

  The `evt_cb` parameter is deprecated and will be ignored in future IDF versions. Directly register for WiFi events to get DPP events.

  参数:

    evt_cb -- (Deprecated) Callback function to receive DPP related events

esp_err_t esp_supp_dpp_deinit(void)

  De-initialize DPP Supplicant.

         Frees memory from DPP Supplicant Data Structures.

  返回:

    - ESP_OK: Success

esp_err_t esp_supp_dpp_bootstrap_gen(const char *chan_list, esp_supp_dpp_bootstrap_t type, const char *key, const char *info)

  Generates Bootstrap Information as an Enrollee.

         Generates Out Of Band Bootstrap information as an Enrollee which can be
         used by a DPP Configurator to provision the Enrollee.

  参数:

    - chan_list -- List of channels device will be available on for listening

    - type -- Bootstrap method type, only QR Code method is supported for now.

    - key -- (Optional) 32 byte Raw Private Key for generating a Bootstrapping Public Key

    - info -- (Optional) Ancillary Device Information like Serial Number

  返回:

    - ESP_OK: Success

    - ESP_ERR_DPP_INVALID_LIST: Channel list not valid

    - ESP_FAIL: Failure

esp_err_t esp_supp_dpp_start_listen(void)

  Start listening on Channels provided during esp_supp_dpp_bootstrap_gen.

         Listens on every Channel from Channel List for a pre-defined wait time.

  返回:

    - ESP_OK: Success

    - ESP_FAIL: Generic Failure

    - ESP_ERR_INVALID_STATE: ROC attempted before WiFi is started

    - ESP_ERR_NO_MEM: Memory allocation failed while posting ROC request

esp_err_t esp_supp_dpp_stop_listen(void)

  Stop listening on Channels.

         Stops listening on Channels and cancels ongoing listen operation.

  返回:

    - ESP_OK: Success

    - ESP_FAIL: Failure

### Macros

ESP_DPP_MAX_CHAN_COUNT

ESP_ERR_DPP_FAILURE

  Generic failure during DPP Operation

ESP_ERR_DPP_TX_FAILURE

  DPP Frame Tx failed OR not Acked

ESP_ERR_DPP_INVALID_ATTR

  Encountered invalid DPP Attribute

ESP_ERR_DPP_AUTH_TIMEOUT

  DPP Auth response was not received in time

ESP_ERR_DPP_INVALID_LIST

  Channel list given in esp_supp_dpp_bootstrap_gen() is not valid or too big

ESP_ERR_DPP_CONF_TIMEOUT

  DPP Configuration was not received in time

### Type Definitions

typedef enum dpp_bootstrap_type esp_supp_dpp_bootstrap_t

  Types of Bootstrap Methods for DPP.

typedef void (*esp_supp_dpp_event_cb_t)(esp_supp_dpp_event_t evt, void *data)

  Callback function for receiving DPP Events from Supplicant.

         Callback function will be called with DPP related information.

  Param evt:

    DPP event ID

  Param data:

    Event data payload

### Enumerations

enum dpp_bootstrap_type

  Types of Bootstrap Methods for DPP.

  Values:

  enumerator DPP_BOOTSTRAP_QR_CODE

    QR Code Method

  enumerator DPP_BOOTSTRAP_PKEX

    Proof of Knowledge Method

  enumerator DPP_BOOTSTRAP_NFC_URI

    NFC URI record Method

enum esp_supp_dpp_event_t

  Types of Callback Events received from DPP Supplicant.

  Values:

  enumerator ESP_SUPP_DPP_URI_READY

    URI is ready through Bootstrapping

  enumerator ESP_SUPP_DPP_CFG_RECVD

    Config received via DPP Authentication

  enumerator ESP_SUPP_DPP_PDR_RECVD

    Peer Discovery Response is received

  enumerator ESP_SUPP_DPP_FAIL

    DPP Authentication failure

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