static int ssl_close(esp_transport_handle_t t)
{
int ret = -1;
transport_ssl_t *ssl = esp_transport_get_context_data(t);
if (ssl->ssl_initialized) {
esp_tls_conn_delete(ssl->tls);
ssl->ssl_initialized = false;
}
return ret;
}
/**
* @brief Create a new TLS/SSL connection
*/
esp_tls_t *esp_tls_conn_new(const char *hostname, int hostlen, int port, const esp_tls_cfg_t *cfg)
{
esp_tls_t *tls = (esp_tls_t *)calloc(1, sizeof(esp_tls_t));
if (!tls) {
return NULL;
}
/* esp_tls_conn_new() API establishes connection in a blocking manner thus this loop ensures that esp_tls_conn_new()
API returns only after connection is established unless there is an error*/
while (1) {
int ret = esp_tls_low_level_conn(hostname, hostlen, port, cfg, tls);
if (ret == 1) {
return tls;
} else if (ret == -1) {
esp_tls_conn_delete(tls);
ESP_LOGE(TAG, "Failed to open new connection");
return NULL;
}
}
return NULL;
}
static void https_get_task(void *pvParameters)
{
char buf[512];
int ret, len;
#if CONFIG_SSL_USING_WOLFSSL
/* CA date verification need system time */
get_time();
#endif
while(1) {
/* Wait for the callback to set the CONNECTED_BIT in the
event group.
*/
xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
false, true, portMAX_DELAY);
ESP_LOGI(TAG, "Connected to AP");
esp_tls_cfg_t cfg = {
.cacert_pem_buf = server_root_cert_pem_start,
.cacert_pem_bytes = server_root_cert_pem_end - server_root_cert_pem_start,
};
struct esp_tls *tls = esp_tls_conn_new(WEB_SERVER, strlen(WEB_SERVER), WEB_PORT, &cfg);
if(tls != NULL) {
ESP_LOGI(TAG, "Connection established...");
} else {
ESP_LOGE(TAG, "Connection failed...");
goto exit;
}
size_t written_bytes = 0;
do {
ret = esp_tls_conn_write(tls,
REQUEST + written_bytes,
strlen(REQUEST) - written_bytes);
if (ret >= 0) {
ESP_LOGI(TAG, "%d bytes written", ret);
written_bytes += ret;
} else if
#if CONFIG_SSL_USING_MBEDTLS
(ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE)
#else
(ret != WOLFSSL_ERROR_WANT_READ && ret != WOLFSSL_ERROR_WANT_WRITE)
#endif
{
ESP_LOGE(TAG, "esp_tls_conn_write returned 0x%x", ret);
goto exit;
}
} while(written_bytes < strlen(REQUEST));
ESP_LOGI(TAG, "Reading HTTP response...");
do
{
len = sizeof(buf) - 1;
bzero(buf, sizeof(buf));
ret = esp_tls_conn_read(tls, (char *)buf, len);
if
#if CONFIG_SSL_USING_MBEDTLS
(ret == MBEDTLS_ERR_SSL_WANT_WRITE || ret == MBEDTLS_ERR_SSL_WANT_READ)
#else
(ret == WOLFSSL_ERROR_WANT_READ && ret == WOLFSSL_ERROR_WANT_WRITE)
#endif
continue;
if(ret < 0)
{
ESP_LOGE(TAG, "esp_tls_conn_read returned -0x%x", -ret);
break;
}
if(ret == 0)
{
ESP_LOGI(TAG, "connection closed");
break;
}
len = ret;
ESP_LOGD(TAG, "%d bytes read", len);
/* Print response directly to stdout as it is read */
for(int i = 0; i < len; i++) {
putchar(buf[i]);
}
} while(1);
exit:
esp_tls_conn_delete(tls);
putchar('\n'); // JSON output doesn't have a newline at end
static int request_count;
ESP_LOGI(TAG, "Completed %d requests", ++request_count);
for(int countdown = 10; countdown >= 0; countdown--) {
ESP_LOGI(TAG, "%d...", countdown);
vTaskDelay(1000 / portTICK_PERIOD_MS);
}
ESP_LOGI(TAG, "Starting again!");
}
}
void app_main()
{
ESP_ERROR_CHECK( nvs_flash_init() );
initialise_wifi();
xTaskCreate(&https_get_task, "https_get_task", 8192, NULL, 5, NULL);
}
