IoT Gateway Design for Real Time QR-Code Display Device in Security Monitoring System

Gateway serves as a protocol for the integration and data transmission. Wi-Fi networks are not accessible in all places, so gateways are added to ensure adequate coverage and expand IoT networks. This paper presents the development of an IoT gateway to support a security monitoring system. An evaluation was conducted to determine the optimum gateway locations in the campus area of Universitas Kristen Duta Wacana. The evaluation focused on two wireless modules, namely LoRa SX1278 and nRF24L01. The physical location of node devices are determined based on the location of the guard stations. The locations are chosen to observe the communication performance between gateway devices and nodes. The performance of data transmission is determined by two factors: the time it takes for the transmission to occur and the rate at which the transmission is successfully finished. Based on the findings, we concluded that LoRa SX1278 outperforms the nRF24L01 with an average delivery time of 1.4 seconds.