The document discusses using the ATS functional programming language to develop safer IoT applications for the ESP8266 WiFi module. ATS supports dependent types, linear types, and optional memory management features that could help prevent common issues like memory safety bugs. The document outlines a demo project implementing JSON output on the ESP8266 using ATS and points out how the type system helps catch errors related to freeing memory correctly. It also advertises an upcoming meetup to discuss functional IoT development further.