Systant

An Elixir application that runs as a systemd daemon to:

1. Publish system stats to MQTT every 30 seconds
2. Listen for commands over MQTT and log them to syslog

Configuration

Edit config/config.exs to configure MQTT connection:

config :systant, Systant.MqttClient,
  host: "localhost",
  port: 1883,
  client_id: "systant",
  username: nil,
  password: nil,
  stats_topic: "system/stats",
  command_topic: "system/commands",
  publish_interval: 30_000

Building

mix deps.get
mix compile

Running

# Development
mix run --no-halt

# Production release
MIX_ENV=prod mix release
_build/prod/rel/systant/bin/systant start

Systemd Installation

1. Build production release
2. Copy binary to /usr/local/bin/
3. Copy systant.service to /etc/systemd/system/
4. Enable and start:

sudo systemctl enable systant
sudo systemctl start systant

Features

• Publishes "Hello from systant" stats every 30 seconds to system/stats topic
• Listens on system/commands topic and logs received messages
• Configurable MQTT connection settings
• Runs as systemd daemon with auto-restart
• Logs to system journal