UI breaking when accessed from wifi access point | Mainsail | Page 1

gilded zodiac Jan 27, 2026, 12:53 PM

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Hi
I already asked on klipper dc but didn't get any response so let me repost here as well.
I have the following setup:

rpi hosts an access point
the ethernet connection is shared to that wifi
when I connect mainsail through ethernet cable, it works fine, but when I do so through wifi ap, the UI crashes after ~10s. here is what journal on rpi says:

Jan 27 13:50:51 promatprusa python[779]: [websockets.py:open()] - Websocket Opened: ID: 547503807312, Proxied: True, User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36, Host >
Jan 27 13:50:51 promatprusa python[779]: [websockets.py:_handle_identify()] - Websocket 547503807312 Client Identified - Name: mainsail, Version: 2.17.0, Type: web
Jan 27 13:50:53 promatprusa python[779]: [websockets.py:on_close()] - Websocket Closed: ID: 547503807312 Close Code: None, Close Reason: None, Pong Time Elapsed: 1.66
Jan 27 13:50:53 promatprusa python[779]: [application.py:log_request()] - 101 GET /websocket (10.42.0.76) [_TRUSTED_USER_] 1.16ms
Jan 27 13:50:53 promatprusa python[779]: [websockets.py:open()] - Websocket Opened: ID: 547503644048, Proxied: True, User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36, Host >
Jan 27 13:50:53 promatprusa python[779]: [websockets.py:_handle_identify()] - Websocket 547503644048 Client Identified - Name: mainsail, Version: 2.17.0, Type: web
Jan 27 13:51:00 promatprusa systemd[1]: NetworkManager-dispatcher.service: Deactivated successfully.
Jan 27 13:51:04 promatprusa python[779]: [websockets.py:on_close()] - Websocket Closed: ID: 547503644048 Close Code: None, Close Reason: None, Pong Time Elapsed: 11.51
Jan 27 13:51:14 promatprusa systemd-networkd[307]: eth0: Gained carrier

I'd appreciate any help!
thank you in advance

uneven hawkBOT Jan 27, 2026, 12:59 PM

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Ahoi @gilded zodiac!
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velvet terrace Jan 27, 2026, 1:00 PM

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do you have sonar enabled?

gilded zodiac Jan 27, 2026, 1:18 PM

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seems it is enabled but not active right now:

knpromat@promatprusa:~ $ systemctl status sonar
○ sonar.service - Sonar - A WiFi Keepalive daemon
     Loaded: loaded (/etc/systemd/system/sonar.service; enabled; preset: enabled)
     Active: inactive (dead) since Tue 2026-01-27 13:03:10 CET; 1h 13min ago
   Duration: 806ms
       Docs: https://github.com/mainsail-crew/sonar
   Main PID: 783 (code=exited, status=0/SUCCESS)
        CPU: 182ms

Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10] Configuration loaded:
Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10]   enable: False
Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10]   debug_log: False
Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10]   persistent_log: False
Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10]   target: auto
Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10]   count: 3
Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10]   interval: 60
Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10]   restart_threshold: 10
Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10] Sonar is disabled in the configuration. Exiting.
Jan 27 13:03:10 promatprusa systemd[1]: sonar.service: Deactivated successfully.

velvet terrace Jan 27, 2026, 1:47 PM

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Jan 27 13:03:10 promatprusa python3[783]: [01/27/2026 13:03:10]   enable: False

its not enabled. this could create your issue in your setup, thats why i asked

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pls upload you complete moonraker.log + the nginx log

gilded zodiac Jan 27, 2026, 1:52 PM

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📎 logs.zip

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but I'm experimenting with this setup since 3h so there might be a ton of crap in there

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when current print ends I can restart everything and generate clean logs

gilded zodiac Jan 27, 2026, 6:15 PM

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btw here is my ip a s config:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether d8:3a:dd:71:f1:f8 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.155/24 brd 192.168.0.255 scope global dynamic noprefixroute eth0
       valid_lft 3348sec preferred_lft 3348sec
    inet6 fe80::8e2a:6847:cabe:9147/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether d8:3a:dd:71:f1:f9 brd ff:ff:ff:ff:ff:ff
    inet 10.42.0.1/24 brd 10.42.0.255 scope global noprefixroute wlan0
       valid_lft forever preferred_lft forever
    inet6 fe80::3f67:5af5:7dfe:4b64/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

velvet terrace Jan 27, 2026, 6:31 PM

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can you post your mainsail config from nginx?

gilded zodiac Jan 27, 2026, 9:27 PM

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velvet terrace can you post your mainsail config from nginx?

📎 message.txt

gilded zodiac Jan 28, 2026, 11:49 AM

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generally I tought its a problem with nginx auth but disabling it didn't help

velvet terrace Jan 28, 2026, 5:13 PM

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can you try to ping it continuily and check if the ping also breaks when the gui break?

gilded zodiac Jan 28, 2026, 5:52 PM

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sure, will do that in ~1h

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sounds like something worth checking

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tbh, I oticed one more thing (idk if related) but when ssh via wifi and trying to start vim, it sometimes just doesn't start and my ssh session gets stuck

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that might mean missing pings tbh

gilded zodiac Jan 28, 2026, 7:47 PM

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velvet terrace can you try to ping it continuily and check if the ping also breaks when the gui...

Ok I just did the testing

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and, when I'm notconnecting mainsail ping is just fine

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but when I try to connect the webgui

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it becomes "uneven"

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sometimes there are packets lost

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sometimes not

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I tried to check cpu load with top but I had no physical access to the rpi and top via ssh over wifi freezed

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I can check tomorrow

velvet terrace Jan 28, 2026, 8:13 PM

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with 1-2sec for a ping, it could just be a websocket issue. so the latency is just too high and it drops the connection. pls check the console output if you see "socket closed" connections

gilded zodiac Jan 28, 2026, 9:01 PM

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what do you mean by "console output"? browser console?

velvet terrace Jan 28, 2026, 9:01 PM

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every browser has also a console. if you press F12, it should open it

gilded zodiac Jan 28, 2026, 9:02 PM

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I'll check tomorrow. I can't get to the lab now

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btw, Is it mainsail who closes the connection due to timeout? maybe I can somehow increase this timeout or something?

velvet terrace Jan 28, 2026, 9:08 PM

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websocket is for "real time" data transfer. this will just be closed, when it get stuck

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its more a technical dependency issue

gilded zodiac Jan 29, 2026, 10:28 AM

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it says this but that message does not have "instant" impact on the UI

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it is responsive till it crashes

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ah, yeah, because this is for the webcam

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which is absent atm

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btw, it suddenly stopped crashing for some reason

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maybe this happens only when the print is going and the rpi processor is under load?

gilded zodiac Jan 29, 2026, 11:58 AM

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well, idk what happened but it still works fine

gilded zodiac Jan 29, 2026, 1:13 PM

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nevermind, still crashes

velvet terrace Jan 29, 2026, 1:33 PM

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it could be just possible, that your printer creates wifi issues and it just drop the wifi

gilded zodiac Jan 29, 2026, 1:36 PM

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well but my printer does not have wifi at all

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also, I've checked and cpu usage when connecting mainsail is not too high

velvet terrace Jan 29, 2026, 2:23 PM

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where did you install klipper & moonraker?

gilded zodiac Jan 29, 2026, 2:51 PM

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Default locations

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But they just found a funny interaction when I plug my AC adapter to my laptop and the socket it's suddenly stops crashing so now I suppose it's just the hardware issue

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Maybe my raspberry misses a valid antenna or something

velvet terrace Jan 29, 2026, 3:19 PM

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and your pi is not in/near your printer?

gilded zodiac Jan 29, 2026, 3:23 PM

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it is

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sec

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here is my setup

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the pi is behind the screen

velvet terrace Jan 29, 2026, 3:39 PM

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gilded zodiac it is

#1465691219307921642 message

gilded zodiac Jan 30, 2026, 10:20 AM

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Well ive checked

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I put my pi like this

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With nothing connected to it except power

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And it still crashes

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rn_image_picker_lib_temp_0f3e4ab7-a12e-49c4-9263-102f3368a372.jpg

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Maybe thats some pi hardware issue

velvet terrace Jan 30, 2026, 10:45 AM

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pi has horrible wifi HW and driver... maybe just this is your issue

gilded zodiac Jan 30, 2026, 10:47 AM

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Possible

gilded zodiac Jan 30, 2026, 10:48 AM

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gilded zodiac But they just found a funny interaction when I plug my AC adapter to my laptop a...

Still no idea why this happens

gilded zodiac Jan 30, 2026, 11:05 AM

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I even tried to use another AC adapter for my pi but the same result

gilded zodiac Jan 30, 2026, 11:31 AM

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What the f***

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I just found out that when I ping the RPI

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Every 0.2 seconds

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It stops crashing

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But it must be exactly 0.2 second not more

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Update 0.3 works as well

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But .4 doesn't

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Nvm, must be .2

gilded zodiac Jan 30, 2026, 11:37 AM

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gilded zodiac

And one more interesting thing is that the ping is almost instant (no spikes like here)

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I will not work on like everything together and check if this work around still works

thin minnow Jan 31, 2026, 10:26 AM

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How many devices are on your wifi network? Wifi is a pretty weird thing, that it basically can only connect to one device at a time. If there is a lot of traffic on your wifi, the pi maybe crashes, due to not getting a connection fast enough?
That's just a theory

gilded zodiac Jan 31, 2026, 2:27 PM

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I'm the onlly device connecting to it

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also, this doesn't explain why pinging it every 0.2 sec fixes the problem...

thin minnow Jan 31, 2026, 3:02 PM

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Like I said, just a theory. But the 0.2s could be treated as a "static" enough stream.

The weirdest thing we saw, was a connection drop, if an iPhone was near the pi.

I would also bet that the Pi isn't just the only device connecting to the AP, as e.g. your Smartphone is most likely not tethered or connected to a different AP, unless you bought a router just for that Pi.

gilded zodiac Jan 31, 2026, 3:59 PM

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the PI is the access point

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and my laptop is the only device connected to that AP

thin minnow Jan 31, 2026, 4:03 PM

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Oh, sry, I didn't read through the whole thread. So I missed that point

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I just read the last few messages

gilded zodiac Jan 31, 2026, 4:20 PM

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I suppose there might be something wrong with driver/networkmanager

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but no idea what that could be

gilded zodiac Mar 16, 2026, 4:09 PM

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Hi, Let me repost here as I got some new info. My workaround (idk if mentioned above) was to ping -i 0.2 10.42.0.1 (ping my rpi and this fixed my issue)

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Today I asked my friend to check some logs while I was pinging the rpi

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and turned out that his connection is unstable as well

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till he started his own ping

velvet terrace Mar 16, 2026, 4:23 PM

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So it's more a network issue in general?

gilded zodiac Mar 17, 2026, 2:27 PM

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velvet terrace So it's more a network issue in general?

Seems so

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Also found out that it affects ssh

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Is mainsailos "officially supported" (whatever that means 😁 ) by debian?

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If so, I think I should report this issue to debian

thin minnow Mar 17, 2026, 2:58 PM

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MainsailOS is just a Raspberry Pi OS Image with the Klipper stack preinstalled, and some extra things, like the networkmanager configuration through a text file, like wpa_supplicant.conf

#UI breaking when accessed from wifi access point