esp32: add const for some WiFi api

Add const if the pointer parameter is const

components/esp32/include/esp_wifi.h

@@ -181,14 +181,14 @@ extern const wpa_crypto_funcs_t g_wifi_default_wpa_crypto_funcs;
   *               which are set by WIFI_INIT_CONFIG_DEFAULT, please be notified that the field 'magic' of 
   *               wifi_init_config_t should always be WIFI_INIT_CONFIG_MAGIC!
   *
-  * @param  config provide WiFi init configuration
+  * @param  config pointer to WiFi init configuration structure; can point to a temporary variable.
   *
   * @return
   *    - ESP_OK: succeed
   *    - ESP_ERR_WIFI_NO_MEM: out of memory
   *    - others: refer to error code esp_err.h
   */
-esp_err_t esp_wifi_init(wifi_init_config_t *config);
+esp_err_t esp_wifi_init(const wifi_init_config_t *config);
 
 /**
   * @brief  Deinit WiFi
@@ -341,7 +341,7 @@ esp_err_t esp_wifi_deauth_sta(uint16_t aid);
   *    - ESP_ERR_WIFI_TIMEOUT: blocking scan is timeout
   *    - others: refer to error code in esp_err.h
   */
-esp_err_t esp_wifi_scan_start(wifi_scan_config_t *config, bool block);
+esp_err_t esp_wifi_scan_start(const wifi_scan_config_t *config, bool block);
 
 /**
   * @brief     Stop the scan in process
@@ -539,7 +539,7 @@ esp_err_t esp_wifi_get_channel(uint8_t *primary, wifi_second_chan_t *second);
   *    - ESP_ERR_WIFI_NOT_INIT: WiFi is not initialized by esp_wifi_init
   *    - ESP_ERR_WIFI_ARG: invalid argument
   */
-esp_err_t esp_wifi_set_country(wifi_country_t *country);
+esp_err_t esp_wifi_set_country(const wifi_country_t *country);
 
 /**
   * @brief     get the current country info
@@ -574,7 +574,7 @@ esp_err_t esp_wifi_get_country(wifi_country_t *country);
   *    - ESP_ERR_WIFI_MODE: WiFi mode is wrong
   *    - others: refer to error codes in esp_err.h
   */
-esp_err_t esp_wifi_set_mac(wifi_interface_t ifx, uint8_t mac[6]);
+esp_err_t esp_wifi_set_mac(wifi_interface_t ifx, const uint8_t mac[6]);
 
 /**
   * @brief     Get mac of specified interface
@@ -682,7 +682,7 @@ esp_err_t esp_wifi_get_promiscuous_filter(wifi_promiscuous_filter_t *filter);
   *    - ESP_ERR_WIFI_NVS: WiFi internal NVS error
   *    - others: refer to the erro code in esp_err.h
   */
-esp_err_t esp_wifi_set_config(wifi_interface_t ifx, wifi_config_t *conf);
+esp_err_t esp_wifi_set_config(wifi_interface_t ifx, const wifi_config_t *conf);
 
 /**
   * @brief     Get configuration of specified interface

components/esp32/include/esp_wifi_internal.h

@@ -58,7 +58,7 @@ extern "C" {
  *    - ESP_ERR_WIFI_NO_MEM: out of memory
  *    - others: refer to error code esp_err.h
  */
-esp_err_t esp_wifi_init_internal(wifi_init_config_t *config);
+esp_err_t esp_wifi_init_internal(const wifi_init_config_t *config);
 
 /**
   * @brief  get whether the wifi driver is allowed to transmit data or not

components/esp32/include/esp_wpa2.h

@@ -68,7 +68,7 @@ esp_err_t esp_wifi_sta_wpa2_ent_disable(void);
   *    - ESP_ERR_WIFI_ARG: fail(len <= 0 or len >= 128)
   *    - ESP_ERR_WIFI_NO_MEM: fail(internal memory malloc fail)
   */
-esp_err_t esp_wifi_sta_wpa2_ent_set_identity(unsigned char *identity, int len);
+esp_err_t esp_wifi_sta_wpa2_ent_set_identity(const unsigned char *identity, int len);
 
 /**
   * @brief  Clear identity for PEAP/TTLS method.
@@ -88,7 +88,7 @@ void esp_wifi_sta_wpa2_ent_clear_identity(void);
   *    - ESP_ERR_WIFI_ARG: fail(len <= 0 or len >= 128)
   *    - ESP_ERR_WIFI_NO_MEM: fail(internal memory malloc fail)
   */
-esp_err_t esp_wifi_sta_wpa2_ent_set_username(unsigned char *username, int len);
+esp_err_t esp_wifi_sta_wpa2_ent_set_username(const unsigned char *username, int len);
 
 /**
   * @brief  Clear username for PEAP/TTLS method.
@@ -108,7 +108,7 @@ void esp_wifi_sta_wpa2_ent_clear_username(void);
   *    - ESP_ERR_WIFI_ARG: fail(len <= 0)
   *    - ESP_ERR_WIFI_NO_MEM: fail(internal memory malloc fail)
   */
-esp_err_t esp_wifi_sta_wpa2_ent_set_password(unsigned char *password, int len);
+esp_err_t esp_wifi_sta_wpa2_ent_set_password(const unsigned char *password, int len);
 
 /**
   * @brief  Clear password for PEAP/TTLS method..
@@ -130,7 +130,7 @@ void esp_wifi_sta_wpa2_ent_clear_password(void);
   *    - ESP_ERR_WIFI_NO_MEM: fail(internal memory malloc fail)
   */
 
-esp_err_t esp_wifi_sta_wpa2_ent_set_new_password(unsigned char *password, int len);
+esp_err_t esp_wifi_sta_wpa2_ent_set_new_password(const unsigned char *password, int len);
 
 /**
   * @brief  Clear new password for MSCHAPv2 method..
@@ -149,7 +149,7 @@ void esp_wifi_sta_wpa2_ent_clear_new_password(void);
   * @return
   *    - ESP_ERR_WIFI_OK: succeed
   */
-esp_err_t esp_wifi_sta_wpa2_ent_set_ca_cert(unsigned char *ca_cert, int len);
+esp_err_t esp_wifi_sta_wpa2_ent_set_ca_cert(const unsigned char *ca_cert, int len);
 
 /**
   * @brief  Clear CA certificate for PEAP/TTLS method.
@@ -172,7 +172,7 @@ void esp_wifi_sta_wpa2_ent_clear_ca_cert(void);
   * @return
   *    - ESP_ERR_WIFI_OK: succeed
   */
-esp_err_t esp_wifi_sta_wpa2_ent_set_cert_key(unsigned char *client_cert, int client_cert_len, unsigned char *private_key, int private_key_len, unsigned char *private_key_passwd, int private_key_passwd_len);
+esp_err_t esp_wifi_sta_wpa2_ent_set_cert_key(const unsigned char *client_cert, int client_cert_len, const unsigned char *private_key, int private_key_len, const unsigned char *private_key_passwd, int private_key_passwd_len);
 
 /**
   * @brief  Clear client certificate and key.

components/esp32/wifi_init.c

@@ -16,7 +16,7 @@
 #include <esp_wifi.h>
 #include "esp_wifi_internal.h"
 
-esp_err_t esp_wifi_init(wifi_init_config_t *config)
+esp_err_t esp_wifi_init(const wifi_init_config_t *config)
 {
      esp_event_set_default_wifi_handlers();
      return esp_wifi_init_internal(config);