I am new in AWS, and I am using AWS IoT greengrass. I have some issues to invoke a Lambda function from the greengrass device.
I am trying to do this: https://docs.aws.amazon.com/greengrass/latest/developerguide/lambda-functions.html
with a little modification. In the AWS example, we can see some suscriptions
Source _ Target _ _______ Topic filter
IoT Cloud _ This function _ test/input_message
This function _ IoT Cloud _ test/topic_results
So the message is first sent from the IoT cloud to the local lambda function and then comes back to another topic. Instead of that, I send a sinusoidal signal (JSON) on a greengrass device called "myDevice" from a simulator. In the subscription I allowed myDevice -> iot Cloud on the topic "iotgateway", and I can see the data comming on the topic. What I would like to do now is to deploy a lambda function on my greengrass that publish the json on a topic (test/topic_results)
In that way, the data would go on the greengrass device and directly in the lambda function, without going through the IoT Cloud.
So I added the following subscriptions :
Source _ Target _ _______ Topic filter
myDevice _ myLambdaFunction _ iotgateway
myLambdaFunction _ IoT Cloud _ test/topic_results
but nothing append... when I add the subscription iot Cloud __ myLambdaFunction __ iotgateway, then it works and I can see the data on the topic, but it means the data goes from myDevice, then on the cloud, and finally in the lambda function. I don't understand why it doesn't work when I try to send the JSON directly on the lambda function in order to stay on the edge..
Do you have any idea about what would be missing ?
Thanks for your help J
