[GH-ISSUE #411] TypeError: 'NoneType' object is not subscriptable in line 404 of OEPL-Flasher.py #1904

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sascha_hemi · 2026-03-20T20:07:15+01:00

sascha_hemi commented

2026-03-20 20:07:15 +01:00

Originally created by @ohuf on GitHub (Dec 12, 2024).
Original GitHub issue: https://github.com/OpenEPaperLink/OpenEPaperLink/issues/411

Describe the bug
running the OPEPL flasher withattached Tag Flasher and Tag throws an error:

python OEPL-Flasher.py -e -z -p COM8 read blaat.bin --flash --pt Successfully opened serial port COM8 Connection with the flasher established. Version: 48 timeout waiting for reply Traceback (most recent call last): File "C:\Users\ohuf\Documents\Code\OpenEPaperLink\Tag_Flasher\OEPL-Flasher.py", line 485, in <module> main() File "C:\Users\ohuf\Documents\Code\OpenEPaperLink\Tag_Flasher\OEPL-Flasher.py", line 404, in main if (answer[0] == 1): ~~~~~~^^^ TypeError: 'NoneType' object is not subscriptable

EDIT 1:
I compiled and uploaded the most recent version (50) of the ESP32 S2 Tag Flasher to the device.
The problem persists:
Using external port Successfully opened serial port COM8 Connection with the flasher established. Version: 50 timeout waiting for reply Traceback (most recent call last): File "C:\Users\oli\Documents\Code\OpenEPaperLink\Tag_Flasher\OEPL-Flasher.py", line 485, in <module> main() File "C:\Users\oli\Documents\Code\OpenEPaperLink\Tag_Flasher\OEPL-Flasher.py", line 404, in main if (answer[0] == 1): ~~~~~~^^^

To Reproduce
Steps to reproduce the behavior:

Connect the Tag to the flasher
Connect Flasher to USB Port
evaluate the associated COM Port
run the command above

Expected behavior
OEPL-Flasher should read the flash

Additional context
I tried this with python 3.11 as well as the latest 3.12 : same behaviour amongst the two.

Originally created by @ohuf on GitHub (Dec 12, 2024). Original GitHub issue: https://github.com/OpenEPaperLink/OpenEPaperLink/issues/411 **Describe the bug** running the OPEPL flasher withattached Tag Flasher and Tag throws an error: `python OEPL-Flasher.py -e -z -p COM8 read blaat.bin --flash --pt Successfully opened serial port COM8 Connection with the flasher established. Version: 48 timeout waiting for reply Traceback (most recent call last): File "C:\Users\ohuf\Documents\Code\OpenEPaperLink\Tag_Flasher\OEPL-Flasher.py", line 485, in <module> main() File "C:\Users\ohuf\Documents\Code\OpenEPaperLink\Tag_Flasher\OEPL-Flasher.py", line 404, in main if (answer[0] == 1): ~~~~~~^^^ TypeError: 'NoneType' object is not subscriptable` EDIT 1: I compiled and uploaded the most recent version (50) of the ESP32 S2 Tag Flasher to the device. The problem persists: `Using external port Successfully opened serial port COM8 Connection with the flasher established. Version: 50 timeout waiting for reply Traceback (most recent call last): File "C:\Users\oli\Documents\Code\OpenEPaperLink\Tag_Flasher\OEPL-Flasher.py", line 485, in <module> main() File "C:\Users\oli\Documents\Code\OpenEPaperLink\Tag_Flasher\OEPL-Flasher.py", line 404, in main if (answer[0] == 1): ~~~~~~^^^` **To Reproduce** Steps to reproduce the behavior: 1. Connect the Tag to the flasher 2. Connect Flasher to USB Port 3. evaluate the associated COM Port 4. run the command above **Expected behavior** OEPL-Flasher should read the flash **Additional context** I tried this with python 3.11 as well as the latest 3.12 : same behaviour amongst the two.

sascha_hemi added the bug label 2026-03-20 20:07:15 +01:00

sascha_hemi closed this issue

2026-03-20 20:07:16 +01:00

sascha_hemi commented

2026-03-20 20:07:16 +01:00

@ohuf commented on GitHub (Dec 12, 2024):

OK, this seems to happen only, when the flasher (ESP32-S2) has bad contact to the tag.
I checked my adapter and one of the pogo-pins wouldn't pogo anymore.
Replaced the pin in question and now I can read the flash!

@ohuf commented on GitHub (Dec 12, 2024): OK, this seems to happen only, when the flasher (ESP32-S2) has bad contact to the tag. I checked my adapter and one of the pogo-pins wouldn't pogo anymore. Replaced the pin in question and now I can read the flash!

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Reference: starred/OpenEPaperLink#1904