Pi4: USB port problems / libroboint

[heuer]

libroboint and / or the fischertechnik devices do not work properly under the Raspberry Pi 4.

See also #45 (comment)

It is currently not clear whether it is a libroboint problem or whether the fischertechnik devices are the cause of the problem.

The problem occurs only with the Raspberry Pi 4, under the Raspberry Pi 3 everything works.

[harbaum]

Did you try both ports? Usb2 and usb3?

[heuer]

Yes, unfortunately both ports are affected.

Unfortunately, a firmware update does not bring any improvement either.

[heuer]

Probably related: https://github.com/yoctopuce-examples/raspberry_4_usb_bug
and the corresponing bug report raspberrypi/linux#3259