This paper presents a simulation and evaluation of a UDP (User Datagram Protocol) client-server model using the Cooja simulator and Contiki OS System. The goal is to establish communication between the router, client, and server to monitor the data transmission and reception through a web server. The UDP protocol allows for fast and efficient data transfer without the need for a pre-established virtual path. The simulation results demonstrate the feasibility of utilizing UDP for real-time services and live communication. The findings highlight the flexibility of UDP in selecting multiple paths for data transmission, enhancing robustness and reliability. Further research can explore optimization techniques for UDP-based communication in diverse Internet of Things (IoT) networks.