Invalid QR code

[Quintasan]

Describe The Problem

Android WireGuard client refuses to import via QR code with

WireGuard/TunnelImporter: Couldn't import tunnel: unkown section in Config

I also tried scanning the QR code using https://play.google.com/store/apps/details?id=de.markusfisch.android.binaryeye&hl=pl&gl=US which yields 03048812 instead of the configuration file as one would expect

[donaldzou]

Huh.. this is weird, what is the output of the QR code?

[donaldzou]

Done

[donaldzou]

This is what I got when I scan it

[Quintasan]

Fascinating, I'm running official WireGuard client from Google Play, and it fails to decode this. Decoding also fails with Binary Eye which usually outputs the contents of QR codes as is.

[donaldzou]

This is interesting lol, I never had this problem since i'm using an iOS device. I will look into it.

[donaldzou]

Fascinating, I'm running official WireGuard client from Google Play, and it fails to decode this. Decoding also fails with Binary Eye which usually outputs the contents of QR codes as is.

What is the output of the qrcode when you use a normal scanner?

[donaldzou]

Hi I've noticed that there are some part of the QR code did not show, around the border, could you try right click and save the qrcode and scan it again with wireguard? I used an android device to scan my own qrcode and it worked.

[Quintasan]

No dice. Still the same issue. I think this is a problem with the library used by WireGuard client, ZXing which fails to recognize this as a QR code.

Binary Eye: UPC-E code
ZXing: UPC-e code

@donaldzou what phone did you use, what Android version? what WireGuard application version?

[donaldzou]

I was using a XiaoMi phone, android 11 and the newest wireguard version (just downloaded from playstore)

[donaldzou]

Can u try this?

[Quintasan]

I created another peer for my Galaxy S10, and it has the same problem when using the WireGuard application. There must be some kind of issue with the way it deals with QR code recognition...

[Quintasan]

Can u try this?

Worked almost instantly. I guess it's those filled-in squares at the edges that made the difference

[donaldzou]

Yes, the the qrcode on your side should looks similar to mine, you mind telling me what browser your are using?

[Quintasan]

Yes, the the qrcode on your side should looks similar to mine, you mind telling me what browser your are using?

Firefox 98.0.2 under Windows 10

[Quintasan]

FYI Chrome does the same shit

[donaldzou]

I used my windows laptop with Firefox and it looks totally fine😂😂

[donaldzou]

FYI Chrome does the same shit

What if is something related to your Windows setting? Could you try log onto the dashboard with your phone?

[Quintasan]

Exactly the same issue happens when I go to the dashboard using my phone. At this point I consider it a problem with my installation.

[donaldzou]

do you mind to do python3 -m pip list | grep Flask-QRcode on your server and let me know the version number?

[Quintasan]

Flask-QRCode 3.0.0

[donaldzou]

This is very interesting... Python should have a same output across all different OS, that's why I choose to use python on this project... I will look into this...

[donaldzou]

Or maybe do a fresh install? If you want to

[anboch]

I've encountered an issue with scanning a QR code on a dark theme. It appears that adding white margins around the QR code is necessary.