Appendix1:How to Unpair the Bluetooth Connection
Appendix2:Check the connection with Arduino IDE's Serial Monitor
Appendix 1. Launch Serial Monitor at Arduino IDE
Set the serial port from "Tools" -> "Port" (/dev/cu/RNBT-* on Mac, COM* on Windows)
To launch the Serial Monitor, click the magnifier button on upper-right corner of the Arduino IDE.
Set the Baudrate to 115200 at the bottom-right corner dropdown list in the Serial Monitor Window.
If the title of Serial Monitor window displays a port name that matched with the name of your Bluetooth Port, the pairing is successful.