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Hi Happs,
the limit of messages per second per connection you are referring to is a non adjustable limit. In such a fan-in scenario it is a best practice to route your messages from multiple devices with an IoT rule to another AWS service like Kinesis Data Streams/Data Firehose or SQS. You can find more information about such patterns in the Designing MQTT Topics for AWS IoT Core whitepaper.
Cheers,
Philipp
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Just to add, we typically recommend that each device publish to its own unique topics, and the IoT Core policy use policy variables to achieve least privilege. The rules engine can use wildcards to still achieve the fan-in that Philipp mentions.