I have some issue I think related... (or not ;) )
My emodmod mount (NEQ5) works well alone
My focuser "arduino" works well alone

Together, ( I have done some symlinks with udev too) -> it's a mess... sometimes it's working, sometimes not...

For the moment, it's connected to a raspberry pi3. I will try to a PC... in order to know if it's a "linux" issue (kernel/usb stack) or a raspi Usb HW issue...

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