IoT Stadium provides a seamless experience for managing connected devices through its Devices menu. Other than adding more device, you can also:
There are several icons and tools which provides an information whether about the device, or a general information on the sidebar and navigation bar.
Tips: To check whether the device is connected or not, you can check on Last Telemetry Column. Also, the Last Telemetry time depends on the interval you set on your device or firmware.