Guest Network screen bug when using an emoji in 2.4GHz SSID on RT-AX58U Firmware Version: 386.7_2 (since 386.3_2)

[dragoworld235]

Hi,

I’ve got this bug since updating my router from 386.1_? to 386.3_2 ( https://www.snbforums.com/threads/asuswrt-merlin-386-3-is-now-available.73815/post-708137 ).
Today I finally factory reset my router to fix it as I thought it was a dirty update problem.
But I triggered the bug even after reset.
You can see it on my screenshots (I just edit them to remove the password field).

When adding the 2.4 guest network 2, the 5 zone disappears.
Disabling it or changing the SSID to something else fixes it.
If the is in the 5 zone, it does not disappear.
The Facebook Wifi zone is also here, or not…

Last image in next message.

 

[dragoworld235]

 

[dragoworld235]

The emoji was removed from my message.
It’s the owl one https://emojipedia.org/owl/.

 

[RMerlin]

This is generally caused by a Javascript error. Open your browser console and post the error message.

 

[dragoworld235]

This is generally caused by a Javascript error. Open your browser console and post the error message.

Uncaught Error: code length overflow. (1772>800)
createData http://192.168.0.1/js/qrcode.min.js:1
makeImpl http://192.168.0.1/js/qrcode.min.js:1
getBestMaskPattern http://192.168.0.1/js/qrcode.min.js:1
make http://192.168.0.1/js/qrcode.min.js:1
makeCode http://192.168.0.1/js/qrcode.min.js:1
QRCode http://192.168.0.1/js/qrcode.min.js:1
genQRCodes http://192.168.0.1/Guest_network.asp:1390
gen_gntable http://192.168.0.1/Guest_network.asp:507
initial http://192.168.0.1/Guest_network.asp:64
onload http://192.168.0.1/Guest_network.asp:1
qrcode.min.js:1:5199

 

[RMerlin]

Uncaught Error: code length overflow. (1772>800)

How long are your SSIDs and passphrases?

 

[dragoworld235]

How long are your SSIDs and passphrases?

Guest Host 2.4:
SSID=<owl emoji>2
password= 60 char
(As seen on a screenshot, when I change the SSID to "auie" without changing the password, the 5 GHz zone is visible)

5 GHz guest:
SSID=<owl emoji>5
password=63 char

 

[L&LD]

Troubleshooting 101 Asus/RMerlin Routers 2020

Top 10 Simple Asus/RMerlin firmware powered Router Troubleshooting steps to try first: NOTE: Although this is for Asus/RMerlin-firmware powered routers, the steps below may be relevant to all routers, to get to a quick fix for common symptoms. Check that the router’s System Time is accurate on...

www.snbforums.com

Point 7 seems relevant here.

 

[RMerlin]

Could be that the QRcode generator isn't Unicode-capable, in which case there isn't much I can do about it. It's just odd that the code length overflow seem to indicate the code is over twice larger than what is supported.

EDIT: Yep, it's an issue with the QRcode library.

https://stackoverflow.com/questions/30796584/qrcode-js-error-code-length-overflow-17161056

Non UTF-8 characters make the qrcode invalid · Issue #266 · davidshimjs/qrcodejs

Can be reproduced using https://codepen.io/davidshimjs/pen/NdBYrg In the JS, line nr 12, change to following: qrcode.makeCode("íadsfasdsöadfas"); It doesn't draw anything.

github.com

 

[dragoworld235]

Could be that the QRcode generator isn't Unicode-capable, in which case there isn't much I can do about it. It's just odd that the code length overflow seem to indicate the code is over twice larger than what is supported.

EDIT: Yep, it's an issue with the QRcode library.

https://stackoverflow.com/questions/30796584/qrcode-js-error-code-length-overflow-17161056

And you have added the qrcode in 386.3 which match with the upgrade where I noticed the problem (386.1_? to 386.3_2).
While testing today I found the workaround to temporarily get the 5GHz zone back by disabling the 2.4 guest network with the emoji. So I can live with it as it will be too much trouble to change my SSID on every devices.
Thanks.

 

[L&LD]

You're painting yourself into a corner that you'll sooner or later, have to walk out from.

 

[dragoworld235]

You're painting yourself into a corner that you'll sooner or later, have to walk out from.

Maybe, but it’s the only problem I had up to now with my owl.

 

[RMerlin]

I found a fork for the qrcode library that adds Unicode support. Works fine for me now when I add an emoji in my SSID, so I will switch to that forked version.

While supported, i don't recommend using emojis. It will eventually bite you the day you try to use a client that does not support them, or you are using a device asking you to manually type the SSID.