A very simple AWS Lambda function to handle an AWS IoT Button. The Lambda function is based on the default Lambda methods when you setup the IOT Button but is in Java. First, it logs the message that it gets from the button to the Lambda log. Then, if the "TO_ADDRESS" address is not already registered with AWS SES it sends a welcome email to let SES know that the destination address is valid. Note that the "FROM_ADDRESS" address also needs to be verified this way too - you may need to set the TO_ADDRESS and FROM_ADDRESS addresses the same to allow you to send email initially.
This code is dependent on having an AWS account and a AWS IoT button. I won't go through the setup as it's well documented on the Amazon site.
However, on the build side this is a simple Maven project. Simply do a:
mvn clean package
to get a Jar file that can be deployed to Lambda. If you've cloned this repository and run
the build then you will need to deploy target/IOTButton-1.0.jar to Lambda.
The handler that will be needed in Lambda is com.hotjoe.aws.lambda.handler.IOTLambdaHandler::handleRequest
with the code I have here.
The setup also needs to have Lambda environment variables for FROM_ADDRESS and TO_ADDRESS. These can be set in the Lambda console under Lambda -> Functions -> (lambda name) -> Code. Again, note that these addresses need to be validated with SES. To simplify things, start by setting them to the same thing. You'll get an email from Amazon that needs to have the link in it clicked on. At that point your "FROM_ADDRESS" can send emails. But you still can't send to arbitrary "TO_ADDRESS" emails - they still need to be validated.