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Decrease default MQTT Maximum Packet Size
Given that the default max_message_size got decreased from 128 MiB to 16 MiB in RabbitMQ 4.0 in #11455, it makes sense to also decrease the default MQTT Maximum Packet Size from 256 MiB to 16 MiB. Since this change was missed in RabbitMQ 4.0, it is scheduled for RabbitMQ 4.1.
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## RabbitMQ 4.1.0 | ||
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## Potential incompatibilities | ||
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* The default MQTT [Maximum Packet Size](https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901086) changed from 256 MiB to 16 MiB. This default can be overriden by [configuring](https://www.rabbitmq.com/docs/configure#config-file) `mqtt.max_packet_size_authenticated`. Note that this value must not be greater than `max_message_size` (which also defaults to 16 MB). |