CoAP Evaluation for Node-Edge Communication on Wireless Multimedia Sensor Network

Abstract

Nowadays, multimedia data has been spreading throughout the world in a network, and the Internet of Things (IoT) also plays a role in it. The current technology can provide multimedia data sensing in an embedded device. The communication resource limitation is still going to be encountered, and it leads to choosing the proper protocol. Constrained Application Protocol (CoAP) is a suitable protocol for the embedded device since it works on top of User Datagram Protocol (UDP), which has a lower overhead compared to Transmission Control Protocol (TCP). CoAP protocol can communicate reliably with a large data payload through a confirmable block-wise approach. The evaluation has been conducted to the CoAP protocol in some research, but it is not yet evaluated in a wireless multimedia sensor network (WMSN) in multiple devices. This paper presents the evaluation of the CoAP protocol performance in multiple multimedia sensor devices connected to the edge server. Several different numbers of nodes are sending the multimedia data through resource-limited access point. The performance is measured by comparing the throughput value and the retransmission event number. The experiment result shows that the device addition affects the average throughput reduction in a linear pattern.