讀取資料庫數據，感測器根據Sensor gateway, 場域分類，並提供日期範圍選擇，將特定範圍數據繪製成圖表顯示於螢幕
Our app reads data from our back-end database, selecting a specific sensor based on sensor type, attached gateway, and located area. We also enable a query function using calendar to select a range of date which the user is interested in when trying to check the data. Later on, we collect the entities of data and visualize it with automatically generated line chart, which can be zoomed in/zoomed out and examine specific data point.