Your Bluetooth dongle (USB stick) will also be assigned a COM port number. This is not used and may hang
up your program if used. Please remove this Port the following way.
Right-click on the Bluetooth dongle icon and choose “Bluetooth settings” from the context menu.
Choose the COM Ports tab.
You will probably see 2 COM ports, select the with the “Incoming” direction which doesn’t have a name.
Click on the “Remove” button