Support for AWS IoT

[cyterdan]

Type: Feature

Is your feature request related to a problem? Please describe.
Currently messaging only supports SQS and SNS, it would be great to have support for AWS IoT messaging as well.

Describe the solution you'd like
I would like spring cloud to subscribe and publish to AWS IoT topics that would be configured via annotations.
Support for @SendTo for a potential response topic would also be nice.
As would automatic extraction of path parameters.

Describe alternatives you've considered
Spring integration has MQTT support which might work either as an alternative or as a basis for support in spring-cloud-aws

Additional context
https://aws.amazon.com/iot-core/
https://docs.spring.io/spring-integration/reference/html/mqtt.html

If you think this is a worthwhile feature I'm willing to contribute.

[arunkpatra]

@cyterdan @maciejwalkowiak Would be glad to contribute.

[maciejwalkowiak]

We will come back to this topic after 3.0 is released. There is no point in adding more integrations based on AWS SDK v1.

If you would find this integration useful, upvote this issue.

[maciejwalkowiak]

@cyterdan @arunkpatra it's been a while. Since we have a foundation for integrating new services we can start working on this one.

What would this integration offer?