Failed registration to Prusa Connect  

Failed registration to Prusa Connect

I've bought the Raspi W but didn't read the guide properly and bought a standard header. Now I'm waiting for the 18mm header to be shipped and meanwhile thought I could test it using USB connection. There are two issues, might be related.

Printer is MK3S with 3.10.1 RC1 firmware. Flashed latest prusalink according to instructions. Raspi W is powered over one USB, the other USB has USB-OTG dongle with the USB-A cable to the printer. Over ssh, created /etc/Prusa-Link/prusa-link.ini with USB connection as suggested here: https://forum.prusa3d.com/forum/postid/491524/

The wizard finds the printer as Unknown for some reason, but I can proceed with registration.

The last step that should redirect me to Prusa Connect to finish the adding however failed with 500 Internal Server Error.

I found this in daemon.log:

Aug 28 21:07:21 PrusaLink prusa.link.web.errors[518]: ERROR: #012  File "/home/pi/.local/lib/python3.7/site-packages/poorwsgi/wsgi.py", line 1069, in __request__#012    args = self.handler_from_table(request)#012  File "/home/pi/.local/lib/python3.7/site-packages/poorwsgi/wsgi.py", line 989, in handler_from_table#012    return handler(req)       # call right handler now#012  File "/home/pi/.local/lib/python3.7/site-packages/prusa/link/web/wizard.py", line 40, in handler#012    return fun(req)#012  File "/home/pi/.local/lib/python3.7/site-packages/prusa/link/web/wizard.py", line 196, in wizard_finish_post#012    code = printer.register()#012  File "/home/pi/.local/lib/python3.7/site-packages/prusa/connect/printer/__init__.py", line 537, in register#012    "type": self.__type.value[0],#012AttributeError("'NoneType' object has no attribute 'value'") {internal_server_error():20}

Now the wizard is no longer available, and on the Settings page I see

PRUSA CONNECT connection status   Connection failed

Encountered 4XX problems while communicating to Connect( https://connect.prusa3d.com:8080)