Unable to send b64encoded image data to MQTT

[sagark82]

Hello
I have successfully established connection of my client device with greengrass core and I am able to send a simple "Hello World" message to the MQTT topic (have tested it via the MQTT test client on the console). However, I want to send image data in b64 encoding. However, I am unable to send it. Is it due to payload size? Is there any way to send image data using the same approach as described in basic_discovery.py.

Attached is the error log when using b64 encoded image data and success log when sending simple "Hello World"
error_log.txt
success_log.txt

[bretambrose]

By default, IoT Core has a 128K message size limit for publishes. While that may be relaxable to a certain extent on a per-account basis, there are substantial restrictions on what can be done with publishes that exceed the limit even if the limit is raised (for example, larger payloads may only be processed by rules engine and won't get sent to subscribers).

You may need to come up with a part-based scheme on top of MQTT. There has been some IoT Core specific work on something like this (https://docs.aws.amazon.com/iot/latest/developerguide/mqtt-based-file-delivery.html) but the SDKs do not yet support it.

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.