OTA update of a specific partition on device

Hi. The AWS IoT OTA mechanism is essentially responsible for securely and reliabily transporting your binary files to your devices. What they are, where you store them, and how you apply them, is largely up to you. The OTA library requires you to provide implementations for numerous platform-specific operations, including these: https://www.freertos.org/Documentation/api-ref/ota-for-aws-iot-embedded-sdk/docs/doxygen/output/html/ota_pal_interface.html. And this is where you can control what is done with each binary.

You can send multiple files in a single OTA update: https://docs.aws.amazon.com/iot/latest/apireference/API_CreateOTAUpdate.html#iot-CreateOTAUpdate-request-files. And each file can have a file name and type: https://docs.aws.amazon.com/iot/latest/apireference/API_OTAUpdateFile.html#iot-Type-OTAUpdateFile-fileName. You can use these to decide how to handle each file.

More generally, a FreeRTOS OTA is just an AWS IoT Job with a pre-defined job document and some additional features layered on top such as code signing. Instead of OTA, you could use jobs directly and have complete freedom to define whatever you want in the job document. OTA however does do some undifferentiated heavy lifting for you, so I would recommend you use it unless it is too restrictive for your needs.

Embedded C SDK: OTA and Job libraries: https://github.com/aws/aws-iot-device-sdk-embedded-C/tree/main/libraries/aws

Embedded C SDK: Demos: https://github.com/aws/aws-iot-device-sdk-embedded-C/tree/main/demos

ESP32-S3 reference implementation: https://github.com/FreeRTOS/iot-reference-esp32c3