Explore a 20-minute IEEE conference talk on enhancing Internet-of-Things (IoT) client security through Language-theoretic Security (LangSec). Delve into a methodology for building secure input-handling functionality in application-layer IoT protocols, focusing on XMPP and MQTT implementations. Learn about the creation of efficient clients with less than 100 lines of code that accurately recognize valid messages. Compare CPU performance against widely deployed protocol implementations and examine the approach's limitations. Gain insights into the importance of principled input handling in addressing prevalent vulnerabilities in the IoT era.