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esp_https_ota: Add support for partial image download

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Fix issue where binary_file_length field is greater than original image length
This commit is contained in:
Shubham Kulkarni
2021-02-02 13:25:40 +05:30
committed by bot
parent 94118efe64
commit 7f8541ff47
3 changed files with 89 additions and 6 deletions
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13
docs/en/api-reference/system/esp_https_ota.rst
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@@ -29,6 +29,19 @@ Application Example
return ESP_OK;
}
Partial Image Download over HTTPS
---------------------------------
To use partial image download feature, enable ``partial_http_download`` configuration in ``esp_https_ota_config_t``.
When this configuration is enabled, firmware image will be downloaded in multiple HTTP requests of specified size.
Maximum content length of each request can be specified by setting ``max_http_request_size`` to required value.
This option is useful while fetching image from a service like AWS S3, where mbedTLS Rx buffer size (:ref:`CONFIG_MBEDTLS_SSL_IN_CONTENT_LEN`)
can be set to lower value which is not possible without enabling this configuration.
Default value of mbedTLS Rx buffer size is set to 16K. By using partial_http_download with max_http_request_size of 4K,
size of mbedTLS Rx buffer can be reduced to 4K. With this confiuration, memory saving of around 12K is expected.
.. only:: esp32
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