TOMAS, MICKO, et al. “Development and Performance Evaluation of a Real-Time Environmental Monitoring System Using ESP32, MQTT, Node-RED, and MySQL Database”. Jurnal Andalas: Rekayasa Dan Penerapan Teknologi, vol. 6, no. 1, June 2026, pp. 47-59, doi:10.25077/jarpet.v6i1.143.