A developer built an affirmations button with Twilio Internet of Things that sends a reassuring text message when pressed. To make the button more portable, they used Flic buttons, which can be configured to do various things and pair with phones via Bluetooth. The developer created a Twilio Function using the Serverless Toolkit to fetch affirmation data from the affirmations.dev API and send an SMS message. They deployed the function, paired it with their phone, and tested its functionality, receiving an SMS affirmation in response. The project showcases how to use Flic buttons with Twilio Functions for custom IoT applications.