AWS IoT Events adds support for custom actions payloads and custom timers
Starting today, you can customize the message in any action triggered by an event or a state change using the new AWS IoT Events expression syntax. This allows you to add custom text and remove irrelevant data from the messages sent by AWS IoT Events. With this launch, you can also define timer durations and MQTT topic names unique to each device (or detector instance).
Source:: Amazon AWS