Development of a Low-Cost Iot-Enabled Queue Management System Using ESP32, ESP-NOW, and Offline Audio-Visual Feedback for Enhanced Service Delivery. BAYERO JOURNAL OF ENGINEERING AND TECHNOLOGY, [S. l.], v. 21, n. 3, p. 19–32, 2026. DOI: 10.67607/xwbw7z08. Disponível em: https://bjet.ng/index.php/jet/article/view/224. Acesso em: 4 sep. 2026.