Trigger AWS DeepLens Lambda

I want to be able to trigger the lambda function that runs on AWS DeepLens via the function-handler/trigger support vs having a long-running function that is continuously processing frames and pumping out messages. AWS Greegrass Lambdas support being triggered. I can send messages down to devices. I have not been able to get that working with DeepLens.

All DeepLens examples I find only have a return statement in the function handler and write a long-running function that either has a while true loop or timer callback. I have not seen any blogs or documentation that show how to manually trigger the function running on the DeepLens device.

I only need 1 inference result and it should be based on when the trigger fires. I tried the long-running approach but once the object comes into view and stops, it stays there for a few minutes. The camera then starts to pump out notifications b/c the detection threshold meets the requirements. I only need the 1 though. Even when the object starts to move out of focus, the threshold is still high enough so messages go out. I want to be able to control that using a trigger and have an on-demand frame be processed.

Is this possible?