Trigger on Absence of Information from AWS IoT

Yes, you can use AWS IoT to check for the absence of messages for a particular time. One way to do this is by using IoT Rules and IoT Events.

First, you can create an IoT Rule that listens for the MQTT messages from your Greengrass core device. In the rule, you can specify a condition that checks the timestamp of the message and compares it to the current time.

Next, you can use the IoT Events service to detect when the condition specified in the IoT Rule is not met. To do this, you can create an IoT Event detector that checks the output of the IoT Rule and triggers an action when the rule's output is "false" or "absent".

You can also use the IoT Events service to specify a "Missing message" detector that checks whether a message has not been received for a certain period of time. You can set the detector's parameters to detect when the message is missing for a specific time, e.g. 10 minutes, and then trigger an action when this condition is met.

Finally, you can use the IoT Action service to trigger an action when the detector finds a missing message. This action can be a Lambda function, an SNS topic, or a SQS queue, among other things.

By using this approach, you can set up an IoT-native solution that checks for the absence of messages and triggers an action when this condition is met, all within the AWS IoT service.