I have a working example of a MongooseOS app that utilizes AWS IoT to control Neopixels. The app is working, but still a work in progress.
The cool part with this app is the Android companion app that allows for a user friendly front-end control.
Source to the MongooseOS App
Source to the Android App
Moved to https://github.com/mongoose-os-apps/neopixel-aws-iot/ , android app added as a folder there, in order to keep everything in one place.
You're granted admin rights to that repo.
Thanks a million!