Wi-Fi Easy ConnectTM (DPP)
Wi-Fi Easy ConnectTM, also known as Device Provisioning Protocol (DPP) or Easy Connect, is a provisioning protocol certified by Wi-Fi Alliance. It is a secure and standardized provisioning protocol for configuration of Wi-Fi Devices. With Easy Connect adding a new device to a network is as simple as scanning a QR Code. This reduces complexity and enhances user experience while onboarding devices without UI like Smart Home and IoT products. Unlike old protocols like WiFi Protected Setup (WPS), Wi-Fi Easy Connect incorporates strong encryption through public key cryptography to ensure networks remain secure as new devices are added. Easy Connect brings many benefits in the User Experience:
Simple and intuitive to use; no lengthy instructions to follow for new device setup
No need to remember and enter passwords into the device being provisioned
Works with electronic or printed QR codes, or human-readable strings
Supports both WPA2 and WPA3 networks
Please refer to Wi-Fi Alliance’s official page on Easy Connect for more information.
ESP32-S2 supports Enrollee mode of Easy Connect with QR Code as the provisioning method. A display is required to display this QR Code. Users can scan this QR Code using their capable device and provision the ESP32-S2 to their Wi-Fi network. The provisioning device needs to be connected to the AP which need not support Wi-Fi Easy Connect™. Easy Connect is still an evolving protocol. Of known platforms that support the QR Code method are some Android smartphones with Android 10 or higher. To use Easy Connect no additional App needs to be installed on the supported smartphone.
Example on how to provision ESP32-S2 using a supported smartphone: wifi/wifi_easy_connect/dpp-enrollee.
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.
evt_cb – Callback function to receive DPP related events
De-initalize DPP Supplicant.
Frees memory from DPP Supplicant Data Structures.
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.
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) Ancilliary Device Information like Serial Number
Start listening on Channels provided during esp_supp_dpp_bootstrap_gen.
Listens on every Channel from Channel List for a pre-defined wait time.
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
Stop listening on Channels.
Stops listening on Channels and cancels ongoing listen operation.
Generic failure during DPP Operation
DPP Frame Tx failed OR not Acked
Encountered invalid DPP Attribute
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
Types of Bootstrap Methods for DPP.
QR Code Method
Proof of Knowledge Method
NFC URI record Method
- enumerator DPP_BOOTSTRAP_QR_CODE