River Water Pollutant Level Monitoring System using Websocket Protocol and LoRa Communication Module

A monitoring system for river water pollution is needed to know how safe river water is for the ecosystem. A river pollution monitoring system that works in real-time is needed so when there is a change in water parameters can be immediately handled by related parties. The location of the river is far from residential areas resulting in limited electrical power resources available to build a river water monitoring system. Lora is one of the communication media that could reach long distances with low power consumption. WebSocket is used to support the ability of the system to send data to the server in real-time. WebSocket only requires one handshake to form a single TCP connection between server and client. in a single TCP connection, client and server can exchange data bidirectionally until one of the clients or servers disconnects. The mechanism of a WebSocket is expected to not make the server busy with many requests and responses. The system architecture in this study consists of a sensor node that functions to obtain data on acidity, temperature, and water turbidity then sent to a gateway node that functions to receive data via LoRa communication in JSON form. The gateway node processes the received JSON and sends data of acidity, temperature, and water turbidity to the client via WebSocket on a web-based application. Functional testing is carried out to ensure the system can work according to its function. Performance testing is based on packet loss, delay, and jitter. Based on the test results, the best performance is on 50 m, the best performance is obtained with the lowest packet loss, lowest delay, and lowest jitter. The worst data transmission performance was obtained on the 400 m test with the highest packet loss, the highest delay, and the highest jitter.