Scheduled/Automated Print Job Start

[Infraviored]

Current Situation

Looking at the integration code, I can see we have pause/resume/stop functionality via MQTT commands (in commands.py), but starting a print job isn't implemented yet.

Use Case

I want to automate print starts based on Home Assistant triggers (e.g., geofencing when leaving home) to avoid printer noise during the day.

The workflow I'm thinking about:

1. Upload file to printer's SD card first (manually or via automation)
2. Start the print job from SD card later through HA automation

Since the Bambu mobile app can already start prints from SD card, this should be possible to implement.

Technical Investigation

Looking at commands.py, I found:

• Communication is via MQTT on port 8883
• Command structure like:

  PAUSE = {"print": {"sequence_id": "0", "command": "pause"}}
  RESUME = {"print": {"sequence_id": "0", "command": "resume"}}

• No existing commands for listing/starting prints from SD card

Questions

1. Has anyone captured the MQTT traffic between app and printer to see:
   • Commands for accessing the "Models" page (SD card listing)
   • Commands for starting a print
2. Are there any security considerations for implementing file access?
3. Is there existing documentation for these commands?

I'm a Python dev willing to help implement this. Would love to collaborate with others who might have already looked into these MQTT commands or are interested in figuring this out.

[Infraviored]

Update: Progress on Print Start Implementation

I've been monitoring MQTT traffic between my printer and the Bambu app. Here's what I found:

When starting a print via the app, this command appears:

{
  "print": {
    "sequence_id": "2032",
    "command": "project_file",
    "param": "Metadata/plate_1.gcode",
    "subtask_name": "Wirespool_A.3mf",
    "plate_idx": 0,
    "url": "file:///sdcard/cache/Wirespool_A.3mf",
    "timelapse": false,
    "bed_leveling": true,
    "flow_cali": false,
    "vibration_cali": false,
    "layer_inspect": false,
    "ams_mapping": [0, -1],
    "use_ams": true
  }
}

However, I'm still missing how to:

1. List available files from the SD card (the command used when opening the Models page)
2. See the complete startup sequence (any commands before/after project_file)

I'm monitoring MQTT on port 8883 with topics:

• device/{serial}/report (from printer)
• device/{serial}/request (to printer)

Anyone familiar with these commands or can point me to documentation? I'll keep investigating and share what I find.

[AdrianGarside]

It is all possible to do, but also quite a bit of work so I haven't got any plans to start work on this any time soon.

[RHolmesLboro]

Which was the MQTT command to trigger a print? I have some code to send any given file over FTPS but can't seem to get the printer to initiate the print, and what arguments are available in the MQTT command (enable AMS, etc)?

[jneilliii]

https://github.com/Doridian/OpenBambuAPI/blob/main/mqtt.md#printproject_file

https://github.com/jneilliii/OctoPrint-BambuPrinter/blob/d0fd4a5434043670c3fc02a2ce7020fc885be1d5/octoprint_bambu_printer/printer/states/idle_state.py#L22

[Infraviored]

Which was the MQTT command to trigger a print? I have some code to send any given file over FTPS but can't seem to get the printer to initiate the print, and what arguments are available in the MQTT command (enable AMS, etc)?

Could you share the code you are speaking about?
Are you also trying to implement the feature i am talking about?

I do not really care about uploading files to the printer, as i will typically do this with the slicer in advance.
But Pulling the list of 3mf files together with their description (name, thumbnail) to represent them in Homeassistant, and to start a job using the description is relevant for me.

[RHolmesLboro]

Give me 3 hours and remind me, I'll send the code I used to poll the files with python. I can pull down the file names and paths then open them to get the rest of the information you want.

[Infraviored]

flo@NUC:~/repos/OctoPrint-BambuPrinter$ /bin/python3 /home/flo/repos/OctoPrint-BambuPrinter/octoprint_bambu_printer/printer/file_system/list_3mf_files.py

Connecting to printer at 192.168.178.70...

Scanning for 3MF files...
------------------------------------------------------------
File: /Untitled.gcode.3mf
Name: Untitled.gcode.3mf
DOS Name: untitl~1.3mf
Size: 1,103,439 bytes
Date: 2024-10-09 23:49:42+00:00
------------------------------------------------------------
File: /Dragon.gcode.3mf
Name: Dragon.gcode.3mf
DOS Name: dragon~1.3mf
Size: 2,068,670 bytes
Date: 2024-10-09 23:52:02+00:00
------------------------------------------------------------
File: /parts1.gcode.3mf
Name: parts1.gcode.3mf
DOS Name: parts1~1.3mf
Size: 827,645 bytes
Date: 2024-10-21 23:49:12+00:00
------------------------------------------------------------
File: /Main.gcode.3mf
Name: Main.gcode.3mf
DOS Name: maingc~1.3mf
Size: 0 bytes
Date: 2024-10-21 23:55:02+00:00
------------------------------------------------------------
File: /Wirespool_1.gcode.3mf
Name: Wirespool_1.gcode.3mf
DOS Name: wiresp~1.3mf
Size: 790,004 bytes
Date: 2024-10-21 23:56:28+00:00
------------------------------------------------------------
File: /Wirespool_A.gcode.3mf
Name: Wirespool_A.gcode.3mf
DOS Name: wiresp~2.3mf
Size: 670,850 bytes
Date: 2024-10-21 23:58:06+00:00
------------------------------------------------------------
File: /Wirespool_B.gcode.3mf
Name: Wirespool_B.gcode.3mf
DOS Name: wiresp~3.3mf
Size: 322,783 bytes
Date: 2024-10-21 23:59:14+00:00
------------------------------------------------------------
File: /Wirespool_1_stack.gcode.3mf
Name: Wirespool_1_stack.gcode.3mf
DOS Name: wiresp~4.3mf
Size: 830,635 bytes
Date: 2024-10-23 16:21:42+00:00
------------------------------------------------------------

hacked sth together already :) going to drop the code soon when this is proper. Maybe later today.

[AdrianGarside]

Does HA have a robust enough UI capabilities to take a list of files, let the user select one and then trigger an action with the choice?

[Infraviored]

I would say yes. We just have to get a list of thumbnails of the 3MF files.
Are these embedded in the 3MF, or is there an additional folder of thumbnails?

It the UI addition becomes boring, I will just create a HTML/JS and embed it in HA.

[RHolmesLboro]

they're embedded in the 3mf file, but 3mf is literally just a renamed zip archive and they all have a standard layout so its piss easy to get the image from it.

…

________________________________ From: Florian Schneider ***@***.***> Sent: 29 October 2024 19:32 To: greghesp/ha-bambulab ***@***.***> Cc: (s) Robin Holmes ***@***.***>; Comment ***@***.***> Subject: Re: [greghesp/ha-bambulab] Scheduled/Automated Print Job Start (Discussion #628) ** THIS MESSAGE ORIGINATED OUTSIDE LOUGHBOROUGH UNIVERSITY ** ** Be wary of links or attachments, especially if the email is unsolicited or you don't recognise the sender's email address. ** I would say yes. We just have to get a list of thumbnails of the 3MF files. Are these embedded in the 3MF, or is there an additional folder of thumbnails? It the UI addition becomes boring, I will just create a HTML/JS and embed it in HA. — Reply to this email directly, view it on GitHub<#628 (reply in thread)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BKKS54TOZIT2O62ZOMTLFC3Z57PFVAVCNFSM6AAAAABQPXRVU6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTCMBZGE3TCNI>. You are receiving this because you commented.Message ID: ***@***.***>