esp-idf/docs/en/api-reference/provisioning/wifi_provisioning.rst

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Wi-Fi Provisioning
==================
Overview
--------
This component provides protocomm endpoint handler - `wifi_prov_config_data_handler` - and related protobuf framework which can be used for Wi-Fi configuration in the context of device provisioning, though it may be used in non-provisioning cases as well. The configuration consists of three commands :
* `get_status` - For querying the Wi-Fi connection status
* `set_config` - For setting the Wi-Fi connection credentials
* `apply_config` - For applying the credentials saved during `set_config` and (re)start the Wi-Fi station
The way this is supposed to work is that the desired Wi-Fi configuration for the ESP32, which is to run as a station and thus connect to an AP with certain credentials, is to be sent during `set_config`. Then `apply_config` is supposed to start (or restart) the Wi-Fi in station mode with the previously set AP credentials. Afterwords, `get_config` command is used to probe the device continuously for Wi-Fi connection status, to ensure that the connection was indeed successful. If the connection failed, then appropriate status code along with disconnection reason, is to be conveyed through `get_config`.
Application Example
-------------------
.. highlight:: c
::
esp_err_t get_status_handler(wifi_prov_config_get_data_t *resp_data)
{
/* Fill the wifi_prov_config_get_data_t structure
* with Wi-Fi station connection status information. */
return ESP_OK;
}
esp_err_t set_config_handler(const wifi_prov_config_set_data_t *req_data)
{
/* Copy contents of req_data->ssid and req_data->password
* which are Wi-Fi AP credentials to which the device will connect */
return ESP_OK;
}
esp_err_t apply_config_handler(void)
{
/* Apply the Wi-Fi STA credentials saved during set_config */
return ESP_OK;
}
/* Structure with various config command handlers to be passed
* as private data during endpoint registration with protocomm */
wifi_prov_config_handlers_t wifi_prov_handlers = {
.get_status_handler = get_status_handler,
.set_config_handler = set_config_handler,
.apply_config_handler = apply_config_handler,
};
/* Set the endpoint handler */
protocomm_add_endpoint(pc, "wifi_config_endpoint",
wifi_prov_config_data_handler,
(void *) &wifi_prov_handlers);
API Reference
-------------
.. include:: /_build/inc/wifi_config.inc