Modem Statistics Parser

A utility to read and parse channel diagnostics information from DOCSIS modems. This package is intended to be used within a Telegraf instance to be fed into InfluxDB. A Prometheus endpoint can also be exposed for collection.

This package has been written in Go in an attempt to allow it to run on low end hardware (such as a Raspberry Pi Zero) with no issues.

• Usage
  • Docker Image
  • Telegraf
  • Prometheus
• Binaries
  • Download
  • Build
• Configuration
  • Example Usage
• Grafana

Usage

In its simplest form, you can run this repository directly. The only dependency being Go.

A compiled binary of this repository will require no dependencies.

Docker Image

A Docker image exists for this repository with Telegraf configured to write to InfluxDB at msh100/modem-stats. This image currently only supports X86.

The following environment variables must be set:

Environment variables must also be passed in for modem-stats to run. Check the configuration section below.

docker-compose.yaml example:

---
version: "2.1"
services:
  modem-stats:
    image: msh100/modem-stats
    container_name: modem-stats
    environment:
      - INFLUX_URL=http://influxdb:8086
      - INFLUX_DB=modem-stats
      - PING_TARGETS=1.1.1.1,8.8.8.8,bbc.co.uk
      - ROUTER_TYPE=superhub3
      - ROUTER_IP=192.168.100.1
    restart: unless-stopped

Telegraf

If you are already running Telegraf, it makes more sense to add an extra input to collect data from your modem.

To do this, we utilise the input.execd plugin (which exists in upstream Telegraf). Telegraf will be able to trigger a statistics fetch and interpret the output to pass it over to your Telegraf outputs.

To run within Telegraf, you should obtain a binary for your architecture and make that binary accessible to Telegraf (this may involve mounting the binary if you are running Docker).

The Telegraf configuration should then use the execd input to collect data from modem stats.

We need to set the --daemon flag to instruct Modem Stats to listen for new STDIN lines to trigger data gathering.

[[inputs.execd]]
  command = ["/modem-stats", "--daemon"]
  data_format = "influx"
  signal = "STDIN"

To pass configuration, you need to start Telegraf with those environment variables defined. If this is not possible, you can create a wrapper script to set those variables and call modem-stats, like the following:

#!/bin/bash
/modem-stats --modem=superhub3 --daemon

Prometheus

Is it possible to expose a Prometheus exporter. If --port is defined, a webserver will start and Prometheus metrics will be accessible at /metrics.

$ /modem-stats --modem=superhub3 --port=9000

Binaries

The output of this repository is ultimately a single static binary with zero dependencies.

Downloading

Upon push to main, this repository builds and pushed binaries. These can be downloaded from:

• Linux amd64
• Linux ARM5
• MacOS ARM64

More architectures can be added on request.

In most cases, these binaries will be sufficient.

Building

If you would like to build the binaries yourself, you will require Go 1.21 (may work with earlier versions, but this is untested).

go build -o modem-stats main.go

For other architectures, extra options will need to be provided. Refer to this blog port for more information.

Configuration

The scripts need to know the modem type (ROUTER_TYPE or --modem=). Additional information depends on the model.

Virgin Media Superhub 3
Ziggo Connectbox:

• ROUTER_TYPE=superhub3 or --modem=superhub3
• ROUTER_IP or --ip=x.x.x.x (defaults to 192.168.100.1)

Virgin Media Superhub 4:

:warning: Warning: Despite this statistics parser being fully functional, after some time the Superhub 4 fails to provide valid statistics until the device is rebooted. This is not an issue with the parser, but is an issue with the Superhub itself. Issue.

• ROUTER_TYPE=superhub4 or --modem=superhub4
• ROUTER_IP or --ip=x.x.x.x (defaults to 192.168.100.1)

Virgin Media Superhub 5:

• ROUTER_TYPE=superhub5 or --modem=superhub5
• ROUTER_IP or --ip=x.x.x.x (defaults to 192.168.100.1)

Com Hem WiFi Hub C2: (This is likely to work on any Sagemcom DOCSIS modem)

• ROUTER_TYPE=comhemc2 or --modem=comhemc2
• ROUTER_IP or --ip=x.x.x.x (defaults to 192.168.10.1)
• ROUTER_USER or --username=admin (defaults to admin)
• ROUTER_PASS or --password=password (defaults to admin)

Ubee UBC1318:

• ROUTER_TYPE=ubee
• ROUTER_IP or --ip=x.x.x.x (defaults to 192.168.100.1)

Technicolor TC4400:

• ROUTER_TYPE=tc4400
• ROUTER_IP or --ip=x.x.x.x (defaults to 192.168.100.1)
• ROUTER_USER or --username=user (defaults to user)
• ROUTER_PASS or --password=password (defaults to password)

Example Usage

$ ROUTER_TYPE=superhub3 ROUTER_IP=192.168.100.1 go run main.go
downstream,channel=3,id=10,modulation=QAM256,scheme=SC-QAM frequency=211000000,snr=403,power=71,prerserr=300,postrserr=0
downstream,channel=9,id=16,modulation=QAM256,scheme=SC-QAM frequency=259000000,snr=409,power=68,prerserr=72,postrserr=0
...
$ go run main.go --modem=superhub3 --ip=192.168.100.1
downstream,channel=3,id=10,modulation=QAM256,scheme=SC-QAM frequency=211000000,snr=403,power=71,prerserr=300,postrserr=0
downstream,channel=9,id=16,modulation=QAM256,scheme=SC-QAM frequency=259000000,snr=409,power=68,prerserr=72,postrserr=0
...

Grafana

You can add the Router Stats dashboard to your Grafana instance by adding dashboard ID 14209.