By 2020 there will be 24 billion IoT devices connected to the Internet, and IoT is projected to have an economic impact of $3.9 to $11.1 trillion by 2025. Clojure has become a popular programming language for implementing IoT solutions, with 92.7% of programmers using Clojure for IoT by 2017 due to its compatibility with the Java virtual machine, dynamic features, and ability to interact with IoT devices and sensors through REPL. The document promotes using Clojure for IoT proof of concepts, fleet management, and commercial IoT applications that involve 4-20 mA sensors and SaaS.