[Modem Request] Technicolor CGM4140COM (XB6)

[Boby360]

Modem Model

CGM4140COM

Manufacturer

Technicolor

Modem IP Address

10.0.0.1

Authentication Required

Yes - requires username/password

Authentication Details (if required)

Logintype: Form-based login page
Default username: admin
Notes: Login page at /index.jst

How are you providing data?

Fallback Mode + Capture HTML (Recommended) - Used built-in capture button

Files Attached

config_entry-cable_modem_monitor-01KFZJ7XJ346W43NSVQ8YCGDA7.json

modem_20260127_182616.sanitized.har.txt

Additional Information

• ISP: Rogers (Shaw)
• Firmware version: Prod_23.2_231009 & Prod_23.2_231009 ??
• Status Page URL: http://10.0.0.1/network_setup.jst
• Notes: This should be quite similar to the already supported XB7. This is the XB6.
  I added the HAR just incase it helps.
  The generated HAR file cannot be uploaded directly to github, so I put .txt at the end. It also required redacting the SN, cookie info, and some more.

Checklist

• I have used Fallback Mode + Capture HTML, OR sanitized my files to remove PII
• I have searched my capture file for my WiFi SSID and password to verify they're not present
• I understand this is a solo-maintained project with no guaranteed timeline for new parsers
• I'm willing to test the parser once it's developed

[kwschulz]

Thanks for the detailed submission - the HAR file and sanitized captures are exactly what I need to build a proper parser.

This is a solo-maintained project and I'm still building out the core infrastructure, so new modem support takes time to integrate properly. I'll add this to the backlog and get to it when I can.

Appreciate your patience!

[Boby360]

Appreciate you tackling this project! I was thinking about writing a parser of some kind a year or so ago, and found this project the other day.

I was thinking about making a PR, as the network_setup.jst was very very similar, but I didn't want to botch things.
I might take a stab at it if I get enough motivation, but I figured at the least I could try to provide all the relevant information.

Again, thanks for all that you are doing. This is a pretty cool project that will help many diagnose problems on a side that isn't traditionally looked at.

[kwschulz]

Thank you Andrew! Believe it or not, this project is only 100 days old. It started as a POC to see what I could do with AI as a co-developer. What we built is exciting and a mess at the same time, but what's true is I've learned a ton.

About a month ago I attempted to abstract the authentication logic to be response-driven and in theory, get smarter with every configured modem. Essentially I was trying to build a universal translator for cable modems. While I still think the idea has merit, the implementation was incredibly fragile. So in the most recent iteration, v3.13, I removed the auto-detect logic and moved each modem config to a yaml file. I left the parsing logic out, figured that would actually be pretty easy once the auth part is solid. Unfortunately AI started to get tripped up with tech debt and although it works for most, I've got a few outliers that keep breaking.

The key thing I've learned now is that the HAR files are critical to getting a modem configured and it's the cornerstone to my next attempt at abstraction. So this is a very long-winded way of saying, I'm about to change the core logic one more time!

That said, I welcome any help others can offer but I do need to get an architecture map out so contributors know what I'm thinking. Ultimately, I'd like to separate the modem.yaml files to their own repo, along with fixtures and the HAR file. I think tests can automatically pull in this data and run through the scenarios. So I'll focus on the platform and make it incredibly easy to drop in new configurations. That's the vision anyway.

[evilpig]

Just wanted to share that the XB7 setting works on my XB8, assumed it would be backwards compatible but some XB6/XB7 are made by Arris which might be to do with it.

https://www.xfinity.com/support/articles/broadband-gateways-userguides