MQTT Transmission tag limit

This is more likely due to AWS IoT Core's message size limitation of 128 KB.
When a client publishes a message that exceeds the limit, IoT Core will drop the connection.

https://aws.amazon.com/iot-core/pricing/#:~:text=You%20can%20send%20and%20receive,metered%20in%205%20KB%20increments.

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