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wolfssl/IDE/Espressif/ESP-IDF/examples/wolfssl_client/main/main.c

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/* main.c
*
* Copyright (C) 2006-2025 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
#include "sdkconfig.h"
#include "main.h"
/* ESP specific */
#include <nvs_flash.h>
#include <esp_log.h>
#include <esp_event.h>
/* wolfSSL */
/* Always include wolfcrypt/settings.h before any other wolfSSL file. */
/* Reminder: settings.h pulls in user_settings.h; don't include it here. */
#ifdef WOLFSSL_USER_SETTINGS
#include <wolfssl/wolfcrypt/settings.h>
#ifndef WOLFSSL_ESPIDF
#warning "Problem with wolfSSL user_settings."
#warning "Check components/wolfssl/include"
#endif
/* This project not yet using the library */
#undef USE_WOLFSSL_ESP_SDK_WIFI
#include <wolfssl/wolfcrypt/port/Espressif/esp32-crypt.h>
#else
/* Define WOLFSSL_USER_SETTINGS project wide for settings.h to include */
/* wolfSSL user settings in ./components/wolfssl/include/user_settings.h */
#error "Missing WOLFSSL_USER_SETTINGS in CMakeLists or Makefile:\
CFLAGS +=-DWOLFSSL_USER_SETTINGS"
#endif
/* this project */
#include "client-tls.h"
#include "time_helper.h"
#ifdef CONFIG_IDF_TARGET_ESP32H2
/* There's no WiFi on ESP32-H2.
* For wired ethernet, see:
* https://github.com/wolfSSL/wolfssl-examples/tree/master/ESP32/TLS13-ENC28J60-client */
#else
#include "wifi_connect.h"
/*
* Note ModBus TCP cannot be disabled on ESP8266 tos-sdk/v3.4
* See https://github.com/espressif/esp-modbus/issues/2
*/
#endif
#ifdef WOLFSSL_TRACK_MEMORY
#include <wolfssl/wolfcrypt/mem_track.h>
#endif
static const char* TAG = "main";
#if defined(WOLFSSL_ESPWROOM32SE) && defined(HAVE_PK_CALLBACKS) \
&& defined(WOLFSSL_ATECC508A)
#include "wolfssl/wolfcrypt/port/atmel/atmel.h"
/* when you want to use a custom slot allocation */
/* enable the definition CUSTOM_SLOT_ALLOCATION. */
#if defined(CUSTOM_SLOT_ALLOCATION)
static byte mSlotList[ATECC_MAX_SLOT];
int atmel_set_slot_allocator(atmel_slot_alloc_cb alloc, atmel_slot_dealloc_cb dealloc);
/* initialize slot array */
void my_atmel_slotInit()
{
int i;
for(i = 0;i < ATECC_MAX_SLOT;i++) {
mSlotList[i] = ATECC_INVALID_SLOT;
}
}
/* allocate slot depending on slotType */
int my_atmel_alloc(int slotType)
{
int i, slot = -1;
switch(slotType){
case ATMEL_SLOT_ENCKEY:
slot = 4;
break;
case ATMEL_SLOT_DEVICE:
slot = 0;
break;
case ATMEL_SLOT_ECDHE:
slot = 0;
break;
case ATMEL_SLOT_ECDHE_ENC:
slot = 4;
break;
case ATMEL_SLOT_ANY:
for(i = 0;i < ATECC_MAX_SLOT;i++){
if(mSlotList[i] == ATECC_INVALID_SLOT){
slot = i;
break;
}
}
}
return slot;
}
/* free slot array */
void my_atmel_free(int slotId)
{
if(slotId >= 0 && slotId < ATECC_MAX_SLOT){
mSlotList[slotId] = ATECC_INVALID_SLOT;
}
}
#endif /* CUSTOM_SLOT_ALLOCATION */
#endif /* WOLFSSL_ESPWROOM32SE && HAVE_PK_CALLBACK && WOLFSSL_ATECC508A */
/* Entry for FreeRTOS */
void app_main(void)
{
#if !defined(SINGLE_THREADED) && INCLUDE_uxTaskGetStackHighWaterMark
int stack_start = 0;
#endif
#if !defined(SINGLE_THREADED)
int this_heap = 0;
#endif
esp_err_t ret = 0;
ESP_LOGI(TAG, "---------------- wolfSSL TLS Client Example ------------");
ESP_LOGI(TAG, "--------------------------------------------------------");
ESP_LOGI(TAG, "--------------------------------------------------------");
ESP_LOGI(TAG, "---------------------- BEGIN MAIN ----------------------");
ESP_LOGI(TAG, "--------------------------------------------------------");
ESP_LOGI(TAG, "--------------------------------------------------------");
#if !defined(CONFIG_WOLFSSL_EXAMPLE_NAME_TLS_CLIENT)
ESP_LOGW(TAG, "Warning: Example wolfSSL misconfigured? Check menuconfig.");
#endif
#if defined(ESP_SDK_MEM_LIB_VERSION) && defined(DEBUG_WOLFSSL)
sdk_init_meminfo();
#endif
#ifdef ESP_TASK_MAIN_STACK
ESP_LOGI(TAG, "ESP_TASK_MAIN_STACK: %d", ESP_TASK_MAIN_STACK);
#endif
#ifdef TASK_EXTRA_STACK_SIZE
ESP_LOGI(TAG, "TASK_EXTRA_STACK_SIZE: %d", TASK_EXTRA_STACK_SIZE);
#endif
#ifdef SINGLE_THREADED
ESP_LOGI(TAG, "Single threaded");
#else
ESP_LOGI(TAG, "CONFIG_ESP_MAIN_TASK_STACK_SIZE = %d bytes (%d words)",
CONFIG_ESP_MAIN_TASK_STACK_SIZE,
(int)(CONFIG_ESP_MAIN_TASK_STACK_SIZE / sizeof(void*)));
#ifdef INCLUDE_uxTaskGetStackHighWaterMark
{
/* Returns the high water mark of the stack associated with xTask. That is,
* the minimum free stack space there has been (in bytes not words, unlike
* vanilla FreeRTOS) since the task started. The smaller the returned
* number the closer the task has come to overflowing its stack.
* see Espressif api-reference/system/freertos_idf
*/
stack_start = uxTaskGetStackHighWaterMark(NULL);
#ifdef ESP_SDK_MEM_LIB_VERSION
{
sdk_var_whereis("stack_start", &stack_start);
}
#endif
ESP_LOGI(TAG, "Stack Start HWM: %d bytes", stack_start);
}
#endif /* INCLUDE_uxTaskGetStackHighWaterMark */
#endif /* SINGLE_THREADED */
#ifdef HAVE_VERSION_EXTENDED_INFO
esp_ShowExtendedSystemInfo();
#endif
#ifdef DEBUG_WOLFSSL
wolfSSL_Debugging_OFF();
#endif
#ifdef CONFIG_IDF_TARGET_ESP32H2
ESP_LOGE(TAG, "No WiFi on the ESP32-H2 and ethernet not yet supported");
while (1) {
vTaskDelay(60000);
}
#endif
/* Set time for cert validation.
* Some lwIP APIs, including SNTP functions, are not thread safe. */
ret = set_time(); /* need to setup NTP before WiFi */
/* Optionally erase flash */
/* ESP_ERROR_CHECK(nvs_flash_erase()); */
#ifdef FOUND_PROTOCOL_EXAMPLES_DIR
ESP_LOGI(TAG, "FOUND_PROTOCOL_EXAMPLES_DIR active, using example code.");
ESP_ERROR_CHECK(nvs_flash_init());
#if defined(CONFIG_IDF_TARGET_ESP32H2)
ESP_LOGE(TAG, "There's no WiFi on ESP32-H2.");
#else
#ifdef CONFIG_EXAMPLE_WIFI_SSID
if (XSTRCMP(CONFIG_EXAMPLE_WIFI_SSID, "myssid") == 0) {
ESP_LOGW(TAG, "WARNING: CONFIG_EXAMPLE_WIFI_SSID is myssid.");
ESP_LOGW(TAG, " Do you have a WiFi AP called myssid, or ");
ESP_LOGW(TAG, " did you forget the ESP-IDF configuration?");
}
#else
#define CONFIG_EXAMPLE_WIFI_SSID "myssid"
ESP_LOGW(TAG, "WARNING: CONFIG_EXAMPLE_WIFI_SSID not defined.");
#endif
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
ESP_ERROR_CHECK(example_connect());
#endif
#else
ESP_ERROR_CHECK(nvs_flash_init());
/* Initialize NVS */
ret = nvs_flash_init();
#if defined(CONFIG_IDF_TARGET_ESP8266)
{
if (ret == ESP_ERR_NVS_NO_FREE_PAGES) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
}
#else
{
/* Non-ESP8266 initialization is slightly different */
if (ret == ESP_ERR_NVS_NO_FREE_PAGES ||
ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
}
#endif /* else not CONFIG_IDF_TARGET_ESP8266 */
ESP_ERROR_CHECK(ret);
#if defined(CONFIG_IDF_TARGET_ESP32H2)
ESP_LOGE(TAG, "There's no WiFi on ESP32-H2. ");
#else
/* Initialize WiFi */
ESP_LOGI(TAG, "ESP_WIFI_MODE_STA");
ret = wifi_init_sta();
while (ret != 0) {
ESP_LOGI(TAG, "Waiting...");
vTaskDelay(60000 / portTICK_PERIOD_MS);
ESP_LOGI(TAG, "Trying WiFi again...");
ret = wifi_init_sta();
}
#endif /* else not CONFIG_IDF_TARGET_ESP32H2 */
#endif /* else FOUND_PROTOCOL_EXAMPLES_DIR not found */
/* Once we are connected to the network, start & wait for NTP time */
ret = set_time_wait_for_ntp();
if (ret < -1) {
/* a value of -1 means there was no NTP server, so no need to wait */
ESP_LOGI(TAG, "Waiting 10 more seconds for NTP to complete." );
vTaskDelay(10000 / portTICK_PERIOD_MS); /* brute-force solution */
esp_show_current_datetime();
}
#if defined(SINGLE_THREADED)
/* just call the task */
tls_smp_client_task((void*)NULL);
#else
tls_args args[1] = {0};
/* start a thread with the task */
args[0].loops = 10;
args[0].port = 11111;
/* HWM is maximum amount of stack space that has been unused, in bytes
* not words (unlike vanilla freeRTOS). */
this_heap = esp_get_free_heap_size();
ESP_LOGI(TAG, "Initial Stack Used (before wolfSSL Server): %d bytes",
CONFIG_ESP_MAIN_TASK_STACK_SIZE
- (uxTaskGetStackHighWaterMark(NULL))
);
ESP_LOGI(TAG, "Starting TLS Client task ...\n");
ESP_LOGI(TAG, "main tls_smp_client_init heap @ %p = %d",
&this_heap, this_heap);
tls_smp_client_init(args);
/* optional additional client threads
tls_smp_client_init(args);
tls_smp_client_init(args);
tls_smp_client_init(args);
tls_smp_client_init(args);
tls_smp_client_init(args);
tls_smp_client_init(args);
tls_smp_client_init(args);
*/
#endif
/* Done */
#ifdef SINGLE_THREADED
ESP_LOGV(TAG, "\n\nDone!\n\n");
while (1);
#else
ESP_LOGV(TAG, "\n\nvTaskDelete...\n\n");
vTaskDelete(NULL);
/* done */
while (1) {
ESP_LOGV(TAG, "\n\nLoop...\n\n");
#ifdef INCLUDE_uxTaskGetStackHighWaterMark
ESP_LOGI(TAG, "Stack HWM: %d", uxTaskGetStackHighWaterMark(NULL));
ESP_LOGI(TAG, "Stack used: %d", CONFIG_ESP_MAIN_TASK_STACK_SIZE
- (uxTaskGetStackHighWaterMark(NULL) ));
#endif
vTaskDelay(60000);
} /* done while */
#endif /* else not SINGLE_THREADED */
} /* app_main */
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