How to save response data from server after HTTPS request

[AdamTracz]

Hi,
I need a help.
In my project I send data to server by HTTP POST request and next i get response from server. I would like to save received data and use it in main function.

I use example of http chunked client which I find on github:

Code: Select all

#include <stdio.h>
#include <string.h>
#include "connect.h"
#include "esp_http_client.h"
#include "esp_log.h"
#include "nvs_flash.h"

static const char *TAG = "REST";

typedef struct chunk_payload_t
{
    uint8_t *buffer;
    int buffer_index;
} chunk_payload_t;

esp_err_t on_client_data(esp_http_client_event_t *evt)
{
    switch (evt->event_id)
    {
    case HTTP_EVENT_ON_DATA:
    {
        // ESP_LOGI(TAG, "Length=%d", evt->data_len);
        // printf("%.*s\n", evt->data_len, (char *)evt->data);
        chunk_payload_t *chunk_payload = evt->user_data;
        chunk_payload->buffer = realloc(chunk_payload->buffer, chunk_payload->buffer_index + evt->data_len + 1);
        memcpy(&chunk_payload->buffer[chunk_payload->buffer_index],(uint8_t *) evt->data, evt->data_len );
        chunk_payload->buffer_index = chunk_payload->buffer_index + evt->data_len;
        chunk_payload->buffer[chunk_payload->buffer_index] = 0;

        printf("buffer******** %s\n",chunk_payload->buffer);

    }
    break;

    default:
        break;
    }
    return ESP_OK;
}

void fetch_quote()
{
    chunk_payload_t chunk_payload = {0};

    esp_http_client_config_t esp_http_client_config = {
        .url = "http://quotes.rest/qod",
        .method = HTTP_METHOD_GET,
        .event_handler = on_client_data,
        .user_data = &chunk_payload};
    esp_http_client_handle_t client = esp_http_client_init(&esp_http_client_config);
    esp_http_client_set_header(client, "Contnet-Type", "application/json");
    esp_err_t err = esp_http_client_perform(client);
    if (err == ESP_OK)
    {
        ESP_LOGI(TAG, "HTTP GET status = %d, result = %s\n",
                 esp_http_client_get_status_code(client),  chunk_payload.buffer);
    }
    else
    {
        ESP_LOGE(TAG, "HTTP GET request failed: %s", esp_err_to_name(err));
    }
    if(chunk_payload.buffer != NULL){
       free(chunk_payload.buffer); 
    }
    esp_http_client_cleanup(client);
    wifi_disconnect();
}

void app_main(void)
{
    ESP_ERROR_CHECK(nvs_flash_init());
    wifi_init();
    ESP_ERROR_CHECK(wifi_connect_sta("POCO", "password", 10000));
    fetch_quote();
}

In my project i have function "on_client_data" and "fetch_quote" in other file than main.c . Evrything is ok, but when I want to printf buffer data in main function then ESP is reboting. Here is screen from terminal: 1.png. (in this example I have a wrong request data but it work)

I try to printf response data in main function by:

Code: Select all

printf("buffer %s\n","name of structure"->buffer); 
ESP_LOGI("ESP32", "buffer = %s", "name of structure".buffer);    		

But anything doesn't work.

Did somebody have a answer where I make a mistake?

I use in my project ESP32 WROOM.

I am waiting for your answer and I will be very grateful for your help.

Adam

[ESP_Sprite]

Code: Select all

    if(chunk_payload.buffer != NULL){
       free(chunk_payload.buffer); 
    }
    esp_http_client_cleanup(client);
    wifi_disconnect();

You do realize your fetch_quote function does this, right?

[AdamTracz]

Hi, thank you for answer.

Yes, I have commented this code snippet.

Now I paste all functions to main.c and i try it but i have this same problem - ESP32 reboot.

I don't know where is a problem, maybe with memory?

Adam