The best way to find out what the iSpindle is doing as information is to read it's log. This can be done via a serial monitor like HTerm or Arduino IDE. Connect the spindle via Micro USB, then open the Com Port with the serial monitor above and read it.
Set baud rate to 115200. It brings light into the dark.

Here is a youtube howto: https://youtu.be/6xDW5GbIbUw