Function esp_idf_sys::nvs_find_key

pub unsafe extern "C" fn nvs_find_key(
    handle: nvs_handle_t,
    key: *const c_char,
    out_type: *mut nvs_type_t,
) -> esp_err_t

@brief Lookup key-value pair with given key name.

Note that function may indicate both existence of the key as well as the data type of NVS entry if it is found.

@param[in] handle Storage handle obtained with nvs_open. @param[in] key Key name. Maximum length is (NVS_KEY_NAME_MAX_SIZE-1) characters. Shouldn’t be empty. @param[out] out_type Pointer to the output variable populated with data type of NVS entry in case key was found. May be NULL, respective data type is then not provided. @return - ESP_OK if NVS entry for key provided was found - ESP_ERR_NVS_NOT_FOUND if the requested key doesn’t exist - ESP_ERR_NVS_INVALID_HANDLE if handle has been closed or is NULL - ESP_FAIL if there is an internal error; most likely due to corrupted NVS partition (only if NVS assertion checks are disabled) - other error codes from the underlying storage driver