Seoul National University of Science and Technology (SeoulTech) 1 article published in JoVE Engineering Data Communication Based on MQTT in a Polymer Extrusion Process Ju Han Kim1, Seo Hui Moon1, Ji Seong Ryu1, Sun Kyoung Kim1 1Department of Mechanical System Design Engineering, Seoul National University of Science and Technology (SeoulTech) This work proposes a flexible method for data communication between a film extrusion system and monitoring devices based on a message protocol called Message Queuing Telemetry Transport (MQTT).