Connect to the button's virtual COM port to read and change its settings.
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Device
Not connected
Settings
Connect the button to begin.
Console
Which port do I pick?
Choose the button's COM port in the browser dialog. A COM port can only be
open in one program at a time, so close the Arduino Serial Monitor or any other
terminal first.
Commands used (115200 baud, one line each) GET returns the current settings as one JSON line (firmware 2.1.0 or newer). KEY:SPACE, LEDMODE:RGB and LEDCOLOR:GREEN
change a setting and store it in flash.
Holding the button for 15 seconds still reboots it into download mode. The COM port
disappears then, so use the firmware installer to flash it.