enabling http auth causes crash

[Thijskunst]

plugin causes cura to crash when sending file to a printer with http basic authentication enabled.

To Reproduce
Steps to reproduce the behavior:

1. load a 3d model
2. slice
3. click 'print on printername' or 'upload to printername'
4. See error

Expected behavior
print starts on printer or file gets uploaded to printer

Version Information

• Operating System: windows 11 pro 22H2
• Cura Version: 5.4.0
• Cura-DuetRRF Plugin Version and Installation: 1.2.9 installed via Marketplace
• Duet RepRapFirmware Version: RepRapFirmware for STM32F4 based Boards 3.5beta2+_103 (2023-02-11)
  Duet WiFi Server Version: 1.27-02S32-D

error traceback
Traceback (most recent call last):
File "C:\Users\thijs\AppData\Roaming\cura\5.4\plugins\DuetRRFPlugin\DuetRRFPlugin\DuetRRFOutputDevice.py", line 234, in _onFilenameAccepted
self._send('rr_connect',
File "C:\Users\thijs\AppData\Roaming\cura\5.4\plugins\DuetRRFPlugin\DuetRRFPlugin\DuetRRFOutputDevice.py", line 137, in _send
headers['Authorization'] = 'Basic ' + base64.b64encode(auth)
TypeError: can only concatenate str (not "bytes") to str

Cura Log

[Kriechi]

Thanks for reporting this @Thijskunst!

In your local file C:\Users\thijs\AppData\Roaming\cura\5.4\plugins\DuetRRFPlugin\DuetRRFPlugin\DuetRRFOutputDevice.py n line 137, please change the line to:

headers['Authorization'] = 'Basic ' + base64.b64encode(auth).decode()

Save the file and restart Cura.

Please try this bug fix - if it works for you, I'll commit a fix and release a new version.

[Thijskunst]

thanks for your reply,

sorry for my slow reply. I was in the proces of changing the kinematics, so i wasnt able to print anything.
i tested it and the plugin works now without any issue.