esp_http_client: Fixed handling of EAGAIN return

For https connection `ESP_TLS_ERR_SSL_WANT_READ` of esp_transport_read was getting treated as error.
Treated this as a timeout to fix connection abort issue!

Also handled http connection EAGAIN with `errno == EAGAIN` check.

Signed-off-by: Vikram Dattu <vikram.dattu@espressif.com>

components/esp_http_client/esp_http_client.c

@@ -967,11 +967,18 @@ int esp_http_client_read(esp_http_client_handle_t client, char *buffer, int len)
                 }
                 ESP_LOG_LEVEL(sev, TAG, "esp_transport_read returned:%d and errno:%d ", rlen, errno);
             }
+#ifdef CONFIG_ESP_HTTP_CLIENT_ENABLE_HTTPS
+            if (rlen == ESP_TLS_ERR_SSL_WANT_READ || errno == EAGAIN) {
+#else
+            if (errno == EAGAIN) {
+#endif
+                ESP_LOGD(TAG, "Received EAGAIN! rlen = %d, errno %d", rlen, errno);
+                return ridx;
+            }
             if (rlen < 0 && ridx == 0 && !esp_http_client_is_complete_data_received(client)) {
                 return ESP_FAIL;
-            } else {
-                return ridx;
             }
+            return ridx;
         }
         res_buffer->output_ptr = buffer + ridx;
         http_parser_execute(client->parser, client->parser_settings, res_buffer->data, rlen);

components/esp_https_ota/src/esp_https_ota.c

@@ -327,6 +327,7 @@ esp_err_t esp_https_ota_perform(esp_https_ota_handle_t https_ota_handle)
             } else if (data_read > 0) {
                 return _ota_write(handle, (const void *)handle->ota_upgrade_buf, data_read);
             } else {
+                ESP_LOGE(TAG, "data read %d, errno %d", data_read, errno);
                 return ESP_FAIL;
             }
             handle->state = ESP_HTTPS_OTA_SUCCESS;