In the current implementation, we have designed three front-end utilities for experimentation and demonstration purposes: real-time display in chart (CHART), data access (DATA), and system configuration (CONFIGURE), as shown in Fig. 4. With the data access utility, users can download and view sensor data stored in the database conveniently. Users can also monitor the sensor data updates in real-time using the real-time display utility. With the system configuration utility, authorized users can configure the sensor network system with a number of global and node-level settings, including measurement period, which sensor nodes to measure, and which sensor to measure. The configuration requests generated by users on the web interface are sent asynchronously to web service on the server and the requests are inserted into a command table in the MySQL database. The gateway application monitors the