Development and Deployment of TLS Communication Protocol in IoT Devices Using MQTT and CoAP Protocols

In the rapidly evolving field of Internet of Things (IoT) technologies, secure data exchange has become a significant challenge for devices with limited resources.This paper examines the implementation of the Transport Layer Security (TLS) protocol for IoT devices utilizing the MQTT and CoAP communication standards.It presents a system designed to ensure data confidentiality, integrity, and authentication through the use of Datagram TLS (DTLS) 1.2, a specific handshake model, and Pre-Shared Key (PSK) authentication.The approach leverages the nRF9160 DK and Thingy devices, which are powered by Arm Cortex-M33 processors and equipped with integrated CryptoCell310 security subsystems.MQTT facilitates a publish/subscribe message exchange model through Mutual TLS, while CoAP enables RESTful requests secured by DTLS.Sensor data are encrypted and transmitted over Bluetooth Low Energy (BLE), with handshake validation conducted through traffic analysis using Wireshark and PSK decryption.This research highlights that lightweight TLS modules, configured with CoAP and MQTT protocols and incorporating ARM's TrustZone technology, can afford secure and efficient communication in constrained environments without sacrificing performance.