[GH-ISSUE #1105] [Bug]: developer mode detection broken #788

Closed
opened 2026-05-06 12:32:55 +02:00 by BreizhHardware · 9 comments

Originally created by @m4rtini2 on GitHub (Apr 23, 2026).
Original GitHub issue: https://github.com/maziggy/bambuddy/issues/1105

Originally assigned to: @maziggy on GitHub.

Component

Bambuddy

Bug Description

The detection of the developer mode is sending false values.

After adding a printer i started a print and verified it was printing by opening the video stream.
Some time later i remotly checked if the print succsseded but the video stream was too dark. I toggled the light on but it did not turn on. The symbol on the page changed but the printer does not react.

When uploading a bug report from the main page the server included a settings file containing the info the developer mode is off. Which is not correct!

This error report got dissmissed as invalid even after posting pictures of the developer mode being turned on in the slicer and was closed before i could upload pictures from the printer proving the devloper mode is was turned on.

Expected Behavior

The light should turn on.

Steps to Reproduce

1 Add a printer
2 print some thing
3 wait untli light turns off
4 click the light on symbol
5 watch the printer

Printer Model

H2C

Bambuddy Version

0.2.3.2

SpoolBuddy Version

No response

Printer Firmware Version

01.01.02.00

Installation Method

Other

Operating System

Linux (Ubuntu/Debian)

Relevant Logs / Support Package

No response

Screenshots

Image Image Image

Additional Context

Developer mode is enabled on the printer and in Bambulab Studio.
BamBuddy was installed with a helper script from https://community-scripts.org/ in an LXC on the Proxmox hypervisor.

Checklist

  • I have searched existing issues to ensure this bug hasn't already been reported
  • I am using the latest version of Bambuddy
  • My printer is set to LAN Only mode
  • My printer has Developer Mode enabled
Originally created by @m4rtini2 on GitHub (Apr 23, 2026). Original GitHub issue: https://github.com/maziggy/bambuddy/issues/1105 Originally assigned to: @maziggy on GitHub. ### Component Bambuddy ### Bug Description The detection of the developer mode is sending false values. After adding a printer i started a print and verified it was printing by opening the video stream. Some time later i remotly checked if the print succsseded but the video stream was too dark. I toggled the light on but it did not turn on. The symbol on the page changed but the printer does not react. When uploading a bug report from the main page the server included a settings file containing the info the developer mode is off. Which is not correct! This error report got dissmissed as invalid even after posting pictures of the developer mode being turned on in the slicer and was closed before i could upload pictures from the printer proving the devloper mode is was turned on. ### Expected Behavior The light should turn on. ### Steps to Reproduce 1 Add a printer 2 print some thing 3 wait untli light turns off 4 click the light on symbol 5 watch the printer ### Printer Model H2C ### Bambuddy Version 0.2.3.2 ### SpoolBuddy Version _No response_ ### Printer Firmware Version 01.01.02.00 ### Installation Method Other ### Operating System Linux (Ubuntu/Debian) ### Relevant Logs / Support Package _No response_ ### Screenshots <img width="321" height="377" alt="Image" src="https://github.com/user-attachments/assets/c2856761-69c5-4142-a84f-f87bb7505800" /> <img width="764" height="475" alt="Image" src="https://github.com/user-attachments/assets/59174665-aa0b-4bbf-9fba-3a3a45729e91" /> <img width="923" height="566" alt="Image" src="https://github.com/user-attachments/assets/7f58a79c-86da-42a6-9504-f857846250b9" /> ### Additional Context Developer mode is enabled on the printer and in Bambulab Studio. BamBuddy was installed with a helper script from https://community-scripts.org/ in an LXC on the Proxmox hypervisor. ### Checklist - [x] I have searched existing issues to ensure this bug hasn't already been reported - [x] I am using the latest version of Bambuddy - [x] My printer is set to LAN Only mode - [x] My printer has Developer Mode enabled
BreizhHardware 2026-05-06 12:32:55 +02:00
  • closed this issue
  • added the
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Author
Owner

@maziggy commented on GitHub (Apr 23, 2026):

Please upload a support package -> https://wiki.bambuddy.cool/features/system-info/?h=debug#enable-debug-logging

<!-- gh-comment-id:4306573556 --> @maziggy commented on GitHub (Apr 23, 2026): Please upload a support package -> https://wiki.bambuddy.cool/features/system-info/?h=debug#enable-debug-logging
Author
Owner

@m4rtini2 commented on GitHub (Apr 23, 2026):

Its allready here https://github.com/maziggy/bambuddy/issues/1100
[edited wrong reference]

The same from collected now
bambuddy-support-20260423-195656.zip

<!-- gh-comment-id:4306676014 --> @m4rtini2 commented on GitHub (Apr 23, 2026): Its allready here https://github.com/maziggy/bambuddy/issues/1100 [edited wrong reference] The same from collected now [bambuddy-support-20260423-195656.zip](https://github.com/user-attachments/files/27021515/bambuddy-support-20260423-195656.zip)
Author
Owner

@maziggy commented on GitHub (Apr 23, 2026):

Bambuddy cannot connect to your printer at all.

"printers": [
"model": "H2C",
"state": "unknown",
"firmware_version": null,
"wifi_signal": null,
> "reachable": true,
> "ams_unit_count": 0,
>"ams_tray_count": 0,
>"developer_mode": null,

So obviously the printer is reachable via the network, but the printer doesn't accept any connection from Bambuddy. The only reason for this, that comes to my mind, is: developer mode is not enabled.

Since we have no data.....

  • what firmware version? 01.01.02.00
  • how old is the printer?
  • please share only the first few letters of your printer's serial number (e.g. 0948BB......)
<!-- gh-comment-id:4306726530 --> @maziggy commented on GitHub (Apr 23, 2026): Bambuddy cannot connect to your printer at all. > "printers": [ > "model": "H2C", > "state": "unknown", > "firmware_version": null, > "wifi_signal": null, > "reachable": true, > "ams_unit_count": 0, >"ams_tray_count": 0, >"developer_mode": null, So obviously the printer is reachable via the network, but the printer doesn't accept any connection from Bambuddy. The only reason for this, that comes to my mind, is: developer mode is not enabled. Since we have no data..... - what firmware version? 01.01.02.00 - how old is the printer? - please share only the first few letters of your printer's serial number (e.g. 0948BB......)
Author
Owner

@m4rtini2 commented on GitHub (Apr 23, 2026):

I can stream a video by clicking the camera icon. With the room light on i can see a clear picture.
When i turn the printer off it is shown as offline, when its turned on it shows connected OK OK door closed.
The printer is from January 2026, serial number starts with 31B8BP...

Image

somtimes it drops connection for a second and shows offline, file manager works

<!-- gh-comment-id:4306831382 --> @m4rtini2 commented on GitHub (Apr 23, 2026): I can stream a video by clicking the camera icon. With the room light on i can see a clear picture. When i turn the printer off it is shown as offline, when its turned on it shows connected OK OK door closed. The printer is from January 2026, serial number starts with 31B8BP... <img width="367" height="624" alt="Image" src="https://github.com/user-attachments/assets/6afadf14-1ec0-4471-abdb-c0c86713dfc0" /> somtimes it drops connection for a second and shows offline, file manager works
Author
Owner

@maziggy commented on GitHub (Apr 23, 2026):

BL obviously introdcued new serial numbers for the H2C. Need to add a new serial prefix.

<!-- gh-comment-id:4307492831 --> @maziggy commented on GitHub (Apr 23, 2026): BL obviously introdcued new serial numbers for the H2C. Need to add a new serial prefix.
Author
Owner

@m4rtini2 commented on GitHub (Apr 23, 2026):

I did not enter the real serial number in the printer profile. But i tried a second profile with the original serial number and it did not connect correctly either. I wish bambuddy would connect to the printer without real device serial number. Just with ip and access code, like bambustudio.

<!-- gh-comment-id:4307594876 --> @m4rtini2 commented on GitHub (Apr 23, 2026): I did not enter the real serial number in the printer profile. But i tried a second profile with the original serial number and it did not connect correctly either. I wish bambuddy would connect to the printer without real device serial number. Just with ip and access code, like bambustudio.
Author
Owner

@maziggy commented on GitHub (Apr 24, 2026):

New serial prefix was added. Available/Fixed in branch dev and available with the next release or daily build.


Looked at the support package — the symptom isn't a developer-mode detection bug, it's that the MQTT connection is successful but your printer never publishes anything on the topic Bambuddy is subscribed to. The log shows a clean 60-second loop of: connect → subscribe to device//report → zero messages → stale timeout → reconnect →
repeat, forever. Because no report frames ever arrive, developer_mode stays null (unknown, not "off"), state stays "unknown", and firmware_version stays empty — the support-info values you saw are all just "we've had no data to populate these from."

Two things to check on the printer side:

  1. Serial number must match the printer LCD exactly — Bambuddy builds the MQTT topic directly from the string you typed, so a single wrong character (very easy to confuse 0/O or 1/I) gives exactly this fingerprint: broker accepts the subscription, printer publishes to a different topic, we never see anything. Why don't you use auto-discovery?
  2. Try rebooting the printer after toggling developer mode — there's a known firmware quirk on H2 series where the toggle sticks in the UI but LAN-broker publishing only actually activates after a power cycle.
<!-- gh-comment-id:4311114157 --> @maziggy commented on GitHub (Apr 24, 2026): New serial prefix was added. Available/Fixed in branch dev and available with the next release or daily build. --- Looked at the support package — the symptom isn't a developer-mode detection bug, it's that the MQTT connection is successful but your printer never publishes anything on the topic Bambuddy is subscribed to. The log shows a clean 60-second loop of: connect → subscribe to device/<serial>/report → zero messages → stale timeout → reconnect → repeat, forever. Because no report frames ever arrive, developer_mode stays null (unknown, not "off"), state stays "unknown", and firmware_version stays empty — the support-info values you saw are all just "we've had no data to populate these from." Two things to check on the printer side: 1. Serial number must match the printer LCD exactly — Bambuddy builds the MQTT topic directly from the string you typed, so a single wrong character (very easy to confuse 0/O or 1/I) gives exactly this fingerprint: broker accepts the subscription, printer publishes to a different topic, we never see anything. Why don't you use auto-discovery? 2. Try rebooting the printer after toggling developer mode — there's a known firmware quirk on H2 series where the toggle sticks in the UI but LAN-broker publishing only actually activates after a power cycle.
Author
Owner

@m4rtini2 commented on GitHub (Apr 24, 2026):

Thank you for clarifiyng the issue. I see this is a user error and apologize for the incorrect bug report. Please edit the title if helpful for documentation. I have not tested the dev branch but the connection works now. Here is what i did.
On the printer i have turned 'lan only' off and then on again, enabled 'developer-mode' and refreshed the access code. After that i turned the printer off and on.
Still on the 0.2.3.2 version in the 'printers' page i deleted the printer and added it again. This time i used auto-discovery, which i have overseen last time. The printer was found and after entering the access code i can see all the printer and ams information. Toggling light or configuring filaments in ams works.

<!-- gh-comment-id:4312312884 --> @m4rtini2 commented on GitHub (Apr 24, 2026): Thank you for clarifiyng the issue. I see this is a user error and apologize for the incorrect bug report. Please edit the title if helpful for documentation. I have not tested the dev branch but the connection works now. Here is what i did. On the printer i have turned 'lan only' off and then on again, enabled 'developer-mode' and refreshed the access code. After that i turned the printer off and on. Still on the 0.2.3.2 version in the 'printers' page i deleted the printer and added it again. This time i used auto-discovery, which i have overseen last time. The printer was found and after entering the access code i can see all the printer and ams information. Toggling light or configuring filaments in ams works.
Author
Owner

@maziggy commented on GitHub (Apr 24, 2026):


If you find Bambuddy useful, please consider giving it a on GitHub — it helps others discover the project!

<!-- gh-comment-id:4312602644 --> @maziggy commented on GitHub (Apr 24, 2026): ----- If you find Bambuddy useful, please consider giving it a ⭐ on [GitHub](https://github.com/maziggy/bambuddy) — it helps others discover the project!
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