Simplest ESP32 OTA using ESP-IDF

main.c

/*******************************************
 * 
 * Code created by Laboratorio Gluon
 * www.laboratoriogluon.com
 * 
********************************************/

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_event.h"
#include "esp_log.h"
#include "esp_ota_ops.h"
#include "esp_http_client.h"
#include "esp_https_ota.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "string.h"

#include "nvs.h"
#include "nvs_flash.h"
#include <sys/socket.h>


/********** HAY QUE CAMBIAR SOLO ESTO ************/

#define BIN_URL "http://192.168.1.133:8000/firmware.bin"

/*************************************************/

extern void wifi_init_sta();

static const char *TAG = "simple_ota_example";

#define OTA_URL_SIZE 256

esp_err_t _http_event_handler(esp_http_client_event_t *evt)
{
    switch (evt->event_id) {
    case HTTP_EVENT_ERROR:
        ESP_LOGD(TAG, "HTTP_EVENT_ERROR");
        break;
    case HTTP_EVENT_ON_CONNECTED:
        ESP_LOGD(TAG, "HTTP_EVENT_ON_CONNECTED");
        break;
    case HTTP_EVENT_HEADER_SENT:
        ESP_LOGD(TAG, "HTTP_EVENT_HEADER_SENT");
        break;
    case HTTP_EVENT_ON_HEADER:
        ESP_LOGD(TAG, "HTTP_EVENT_ON_HEADER, key=%s, value=%s", evt->header_key, evt->header_value);
        break;
    case HTTP_EVENT_ON_DATA:
        ESP_LOGD(TAG, "HTTP_EVENT_ON_DATA, len=%d", evt->data_len);
        break;
    case HTTP_EVENT_ON_FINISH:
        ESP_LOGD(TAG, "HTTP_EVENT_ON_FINISH");
        break;
    case HTTP_EVENT_DISCONNECTED:
        ESP_LOGD(TAG, "HTTP_EVENT_DISCONNECTED");
        break;
    case HTTP_EVENT_REDIRECT:
        ESP_LOGD(TAG, "HTTP_EVENT_REDIRECT");
        break;
    }
    return ESP_OK;
}

void simple_ota_example_task(void *pvParameter)
{
    ESP_LOGI(TAG, "Starting OTA example task");
    esp_http_client_config_t config = {
        .url = BIN_URL, 
        .event_handler = _http_event_handler,
        .keep_alive_enable = true,

    };

    esp_https_ota_config_t ota_config = {
        .http_config = &config,
    };
    ESP_LOGI(TAG, "Attempting to download update from %s", config.url);
    esp_err_t ret = esp_https_ota(&ota_config);
    if (ret == ESP_OK) {
        ESP_LOGI(TAG, "OTA Succeed, Rebooting...");
        esp_restart();
    } else {
        ESP_LOGE(TAG, "Firmware upgrade failed");
    }
    while (1) {
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
}


void app_main(void)
{
    ESP_LOGI(TAG, "OTA example app_main start");
    // Initialize NVS.
    esp_err_t err = nvs_flash_init();
    if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
        // 1.OTA app partition table has a smaller NVS partition size than the non-OTA
        // partition table. This size mismatch may cause NVS initialization to fail.
        // 2.NVS partition contains data in new format and cannot be recognized by this version of code.
        // If this happens, we erase NVS partition and initialize NVS again.
        ESP_ERROR_CHECK(nvs_flash_erase());
        err = nvs_flash_init();
    }
    ESP_ERROR_CHECK(err);

    // Initialize and connect to Wifi
    wifi_init_sta();

    xTaskCreate(&simple_ota_example_task, "ota_example_task", 8192, NULL, 5, NULL);
}

platformio.ini

[env:esp32doit-devkit-v1]
platform = espressif32
board = esp32doit-devkit-v1
framework = espidf

monitor_speed = 115200

board_build.partitions=partitions_two_ota_coredump.csv

wifi.c

#include "freertos/FreeRTOS.h"
#include "freertos/event_groups.h"
#include "esp_wifi.h"
#include "esp_log.h"

#define WIFI_SSID <TU_SSID_AQUI>
#define WIFI_PWD <CONTRASENYA_WIFI>

static EventGroupHandle_t s_wifi_event_group;

static int s_retry_num = 0;

#define WIFI_CONNECTED_BIT BIT0
#define WIFI_FAIL_BIT      BIT1

static const char *TAG = "WIFI";

static void event_handler(void* arg, esp_event_base_t event_base,
                                int32_t event_id, void* event_data)
{
    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
        esp_wifi_connect();
    } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
        if (s_retry_num < 5) {
            esp_wifi_connect();
            s_retry_num++;
            ESP_LOGI(TAG, "retry to connect to the AP");
        } else {
            xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
        }
        ESP_LOGI(TAG,"connect to the AP fail");
    } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
        ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
        ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
        s_retry_num = 0;
        xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
    }
}


void wifi_init_sta(void)
{
    s_wifi_event_group = xEventGroupCreate();

    ESP_ERROR_CHECK(esp_netif_init());

    ESP_ERROR_CHECK(esp_event_loop_create_default());
    esp_netif_create_default_wifi_sta();

    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    ESP_ERROR_CHECK(esp_wifi_init(&cfg));

    esp_event_handler_instance_t instance_any_id;
    esp_event_handler_instance_t instance_got_ip;
    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
                                                        ESP_EVENT_ANY_ID,
                                                        &event_handler,
                                                        NULL,
                                                        &instance_any_id));
    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
                                                        IP_EVENT_STA_GOT_IP,
                                                        &event_handler,
                                                        NULL,
                                                        &instance_got_ip));

    wifi_config_t wifi_config = {
        .sta = {
            .ssid = WIFI_SSID,
            .password = WIFI_PWD,
            .threshold.authmode = WIFI_AUTH_WPA2_PSK,
        },
    };
    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
    ESP_ERROR_CHECK(esp_wifi_start() );

    ESP_LOGI(TAG, "wifi_init_sta finished.");

    EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
            WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
            pdFALSE,
            pdFALSE,
            portMAX_DELAY);

}