FTDuino can not connect using WebUSB, Scratch nor Brickly

[KKempen]

Hi, just got the FTDuino in the mail and wrote the first few programs, now I wanted to use Scratch so I downloaded the IOServer software as described in the manual.

On my Win10 machine when I try to connect using the online Scratch editor nothing shows up in the popup window;

When i do the same thing on my linux machine (Debian 10 Mate on a i386 architecture) usin' Chromium FTDuino shows up in de selection window, however when I try to connect. An error is returned: "Connection error: NotFoundError: The interface number provided is not supported by the device in its current configuration."
Can you please comment on this behaviour?

[harbaum]

Regarding the Windows issue: WebUSB can be rather tricky under Windows in general as seen e.g. here: WICG/webusb#143

There are two "popular" ways to deal with this. Sometimes the following hint helps:

Enabling new usb backend for Windows on Chrome flag solved the problem for us, chrome://flags/#new-usb-backend

And sometimes (more often) this one:

Try to install WinUSB drivers manually with Zadig - https://zadig.akeo.ie/

[harbaum]

Regarding your Linux issue: I have never seen/heard that. The error message is not very detailed. Two things come to mind:

a) Is the correct sketch installed with the Board set to "ftduino (webusb)"?

b) The Udev rules have been setup correctly? Especially this one:
ATTRS{idVendor}=="1c40" ATTRS{idProduct}=="0538", ENV{ID_MM_DEVICE_IGNORE}="1", MODE="0666"