Add Home Assistant MQTT auto-discovery integration
- Implement `Systant.HaDiscovery` module for automatic device registration - Add comprehensive sensor discovery: CPU, memory, GPU, disk, network, temperature - Update MQTT client to publish discovery messages on startup - Add HomeAssistant configuration section to systant.toml - Create example configuration file with localhost MQTT broker - Update CLAUDE.md with complete HA integration documentation - Add mosquitto to development dependencies for testing 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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34
CLAUDE.md
34
CLAUDE.md
@ -187,11 +187,35 @@ mosquitto_pub -t "systant/hostname/commands" -m '{"command":"restart","params":[
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mosquitto_sub -t "systant/+/responses"
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```
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### Phase 3: Home Assistant Integration
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- Custom MQTT integration following Home Assistant patterns
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- Auto-discovery of systant hosts via MQTT discovery protocol
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- Create entities for metrics (sensors) and commands (buttons/services)
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- Dashboard cards and automation support
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### Phase 3: Home Assistant Integration (Completed)
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- ✅ **MQTT Auto-Discovery**: `server/lib/systant/ha_discovery.ex` - Publishes HA discovery configurations for automatic device registration
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- ✅ **Device Registration**: Creates unified "Systant {hostname}" device in Home Assistant with comprehensive sensor suite
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- ✅ **Sensor Auto-Discovery**: CPU load averages, memory usage, system uptime, temperatures, GPU metrics, disk usage, network stats
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- ✅ **Configuration Integration**: TOML-based enable/disable with `homeassistant.discovery_enabled` setting
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- ✅ **Value Templates**: Proper JSON path extraction for nested metrics data with error handling
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- ✅ **Real-time Updates**: Seamless integration with existing MQTT stats publishing - no additional topics needed
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#### Home Assistant Integration Features
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- **Automatic Discovery**: No custom integration required - uses standard MQTT discovery protocol
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- **Device Grouping**: All sensors grouped under single "Systant {hostname}" device for clean organization
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- **Comprehensive Metrics**: CPU, memory, disk, GPU (NVIDIA/AMD), network, temperature, and system sensors
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- **Configuration Control**: Enable/disable discovery via `systant.toml` configuration
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- **Template Flexibility**: Advanced Jinja2 templates handle optional/missing data gracefully
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- **Topic Structure**: Discovery on `homeassistant/#`, stats remain on `systant/{hostname}/stats`
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#### Setup Instructions
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1. **Configure MQTT Discovery**: Set `homeassistant.discovery_enabled = true` in `systant.toml`
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2. **Start Systant**: Discovery messages published automatically on startup (1s after MQTT connection)
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3. **Check Home Assistant**: Device and sensors appear automatically in MQTT integration
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4. **Verify Metrics**: All sensors should show current values within 30 seconds
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#### Available Sensors
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- **CPU**: Load averages (1m, 5m, 15m), temperature
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- **Memory**: Usage percentage, used/total in GB
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- **Disk**: Root and home filesystem usage percentages
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- **GPU**: NVIDIA/AMD utilization, temperature, memory usage
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- **Network**: RX/TX bytes for primary interface
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- **System**: Uptime in hours, kernel version, online status
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### Future Plans
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- Multi-host deployment for comprehensive system monitoring
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@ -45,6 +45,9 @@
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# Database for development
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postgresql
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# Mosquito for MQTT support
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mosquitto
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];
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shellHook = ''
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@ -70,6 +70,10 @@ defmodule Systant.Config do
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"password" => "",
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"qos" => 0
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},
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"homeassistant" => %{
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"discovery_enabled" => true,
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"discovery_prefix" => "homeassistant"
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},
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"logging" => %{
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"level" => "info",
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"log_config_changes" => true,
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182
server/lib/systant/ha_discovery.ex
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182
server/lib/systant/ha_discovery.ex
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@ -0,0 +1,182 @@
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defmodule Systant.HaDiscovery do
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@moduledoc """
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Home Assistant MQTT Discovery integration for Systant.
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Publishes device and entity discovery configurations to Home Assistant
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via MQTT following the HA discovery protocol.
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Discovery topic format: homeassistant/<component>/<node_id>/<object_id>/config
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"""
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require Logger
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@manufacturer "Systant"
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@model "System Monitor"
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@doc """
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Publish all discovery configurations for a host
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"""
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def publish_discovery(client_pid, hostname, config \\ nil) do
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app_config = config || Systant.Config.load_config()
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ha_config = Systant.Config.get(app_config, ["homeassistant"]) || %{}
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if ha_config["discovery_enabled"] != false do
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discovery_prefix = ha_config["discovery_prefix"] || "homeassistant"
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device_config = build_device_config(hostname)
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# Publish device discovery first
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publish_device_discovery(client_pid, hostname, device_config, discovery_prefix)
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# Publish sensor discoveries
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publish_sensor_discoveries(client_pid, hostname, device_config, discovery_prefix)
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Logger.info("Published Home Assistant discovery for #{hostname}")
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else
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Logger.info("Home Assistant discovery disabled in configuration")
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end
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end
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@doc """
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Remove all discovery configurations for a host
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"""
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def remove_discovery(client_pid, hostname, config \\ nil) do
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app_config = config || Systant.Config.load_config()
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ha_config = Systant.Config.get(app_config, ["homeassistant"]) || %{}
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discovery_prefix = ha_config["discovery_prefix"] || "homeassistant"
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# Remove by publishing empty payloads to discovery topics
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sensors = get_sensor_definitions(hostname)
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Enum.each(sensors, fn {component, object_id, _config} ->
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topic = "#{discovery_prefix}/#{component}/#{hostname}/#{object_id}/config"
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Tortoise.publish(client_pid, topic, "", retain: true)
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end)
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Logger.info("Removed Home Assistant discovery for #{hostname}")
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end
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# Private functions
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defp publish_device_discovery(client_pid, hostname, device_config, discovery_prefix) do
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# Use device-based discovery for multiple components
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components_config = %{
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device: device_config,
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components: build_all_components(hostname, device_config)
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}
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topic = "#{discovery_prefix}/device/#{hostname}/config"
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payload = Jason.encode!(components_config)
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Tortoise.publish(client_pid, topic, payload, retain: true)
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end
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defp publish_sensor_discoveries(client_pid, hostname, device_config, discovery_prefix) do
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sensors = get_sensor_definitions(hostname)
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Enum.each(sensors, fn {component, object_id, config} ->
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full_config = Map.merge(config, %{device: device_config})
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topic = "#{discovery_prefix}/#{component}/#{hostname}/#{object_id}/config"
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payload = Jason.encode!(full_config)
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Tortoise.publish(client_pid, topic, payload, retain: true)
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end)
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end
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defp build_device_config(hostname) do
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%{
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identifiers: ["systant_#{hostname}"],
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name: "Systant #{hostname}",
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manufacturer: @manufacturer,
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model: @model,
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sw_version: Application.spec(:systant, :vsn) |> to_string()
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}
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end
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defp build_all_components(hostname, device_config) do
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get_sensor_definitions(hostname)
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|> Enum.map(fn {_component, object_id, config} ->
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Map.merge(config, %{device: device_config})
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|> Map.put(:object_id, object_id)
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end)
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end
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defp get_sensor_definitions(hostname) do
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base_topic = "systant/#{hostname}/stats"
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[
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# CPU Sensors
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{"sensor", "cpu_load_1m", build_sensor_config("CPU Load 1m", "#{base_topic}", "cpu.avg1", "load", "mdi:speedometer")},
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{"sensor", "cpu_load_5m", build_sensor_config("CPU Load 5m", "#{base_topic}", "cpu.avg5", "load", "mdi:speedometer")},
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{"sensor", "cpu_load_15m", build_sensor_config("CPU Load 15m", "#{base_topic}", "cpu.avg15", "load", "mdi:speedometer")},
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# Memory Sensors
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{"sensor", "memory_used_percent", build_sensor_config("Memory Used", "#{base_topic}", "memory.used_percent", "%", "mdi:memory")},
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{"sensor", "memory_used_gb", build_sensor_config("Memory Used GB", "#{base_topic}", "memory.used_kb", "GB", "mdi:memory", "{{ (value_json.memory.used_kb | float / 1024 / 1024) | round(2) }}")},
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{"sensor", "memory_total_gb", build_sensor_config("Memory Total GB", "#{base_topic}", "memory.total_kb", "GB", "mdi:memory", "{{ (value_json.memory.total_kb | float / 1024 / 1024) | round(2) }}")},
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# System Sensors
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{"sensor", "uptime_hours", build_sensor_config("Uptime", "#{base_topic}", "system.uptime_seconds", "h", "mdi:clock-outline", "{{ (value_json.system.uptime_seconds | float / 3600) | round(1) }}")},
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{"sensor", "kernel_version", build_sensor_config("Kernel Version", "#{base_topic}", "system.kernel_version", nil, "mdi:linux")},
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# Temperature Sensors
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{"sensor", "cpu_temperature", build_sensor_config("CPU Temperature", "#{base_topic}", "temperature.cpu", "°C", "mdi:thermometer")},
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# GPU Sensors - NVIDIA
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{"sensor", "gpu_nvidia_utilization", build_sensor_config("NVIDIA GPU Utilization", "#{base_topic}", "gpu.nvidia[0].utilization_percent", "%", "mdi:expansion-card", "{{ value_json.gpu.nvidia[0].utilization_percent if value_json.gpu.nvidia and value_json.gpu.nvidia|length > 0 else 0 }}")},
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{"sensor", "gpu_nvidia_temperature", build_sensor_config("NVIDIA GPU Temperature", "#{base_topic}", "gpu.nvidia[0].temperature_c", "°C", "mdi:thermometer", "{{ value_json.gpu.nvidia[0].temperature_c if value_json.gpu.nvidia and value_json.gpu.nvidia|length > 0 else none }}")},
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{"sensor", "gpu_nvidia_memory", build_sensor_config("NVIDIA GPU Memory", "#{base_topic}", "gpu.nvidia[0].memory_used_mb", "MB", "mdi:memory", "{{ value_json.gpu.nvidia[0].memory_used_mb if value_json.gpu.nvidia and value_json.gpu.nvidia|length > 0 else none }}")},
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# GPU Sensors - AMD
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{"sensor", "gpu_amd_utilization", build_sensor_config("AMD GPU Utilization", "#{base_topic}", "gpu.amd[0].utilization_percent", "%", "mdi:expansion-card", "{{ value_json.gpu.amd[0].utilization_percent if value_json.gpu.amd and value_json.gpu.amd|length > 0 else 0 }}")},
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{"sensor", "gpu_amd_temperature", build_sensor_config("AMD GPU Temperature", "#{base_topic}", "gpu.amd[0].temperature_c", "°C", "mdi:thermometer", "{{ value_json.gpu.amd[0].temperature_c if value_json.gpu.amd and value_json.gpu.amd|length > 0 else none }}")},
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# Disk Sensors - Main filesystem usage
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{"sensor", "disk_root_usage", build_sensor_config("Root Disk Usage", "#{base_topic}", "disk.disks", "%", "mdi:harddisk", "{{ (value_json.disk.disks | selectattr('mounted_on', 'equalto', '/') | list | first).use_percent if value_json.disk.disks else 0 }}")},
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{"sensor", "disk_home_usage", build_sensor_config("Home Disk Usage", "#{base_topic}", "disk.disks", "%", "mdi:harddisk", "{{ (value_json.disk.disks | selectattr('mounted_on', 'equalto', '/home') | list | first).use_percent if (value_json.disk.disks | selectattr('mounted_on', 'equalto', '/home') | list) else 0 }}")},
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# Network Sensors - Primary interface
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{"sensor", "network_rx_bytes", build_sensor_config("Network RX Bytes", "#{base_topic}", "network", "bytes", "mdi:download-network", "{{ value_json.network[0].rx_bytes if value_json.network and value_json.network|length > 0 else 0 }}")},
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{"sensor", "network_tx_bytes", build_sensor_config("Network TX Bytes", "#{base_topic}", "network", "bytes", "mdi:upload-network", "{{ value_json.network[0].tx_bytes if value_json.network and value_json.network|length > 0 else 0 }}")},
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# Binary Sensors for status
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{"binary_sensor", "system_online", build_binary_sensor_config("System Online", "#{base_topic}", "mdi:server", "connectivity")}
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]
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end
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defp build_sensor_config(name, state_topic, value_template_path, unit, icon, custom_template \\ nil) do
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base_config = %{
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name: name,
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state_topic: state_topic,
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value_template: custom_template || "{{ value_json.#{value_template_path} }}",
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icon: icon,
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unique_id: "systant_#{String.replace(state_topic, "/", "_")}_#{String.replace(value_template_path, ".", "_")}",
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origin: %{
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name: "Systant",
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sw_version: Application.spec(:systant, :vsn) |> to_string(),
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support_url: "https://github.com/user/systant"
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}
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}
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if unit do
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Map.put(base_config, :unit_of_measurement, unit)
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else
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base_config
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end
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end
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defp build_binary_sensor_config(name, state_topic, icon, device_class) do
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%{
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name: name,
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state_topic: state_topic,
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value_template: "{{ 'ON' if value_json.timestamp else 'OFF' }}",
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device_class: device_class,
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icon: icon,
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unique_id: "systant_#{String.replace(state_topic, "/", "_")}_online",
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origin: %{
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name: "Systant",
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sw_version: Application.spec(:systant, :vsn) |> to_string(),
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support_url: "https://github.com/user/systant"
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}
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}
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end
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end
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@ -41,6 +41,10 @@ defmodule Systant.MqttClient do
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Process.send_after(self(), :publish_startup_stats, startup_delay)
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Logger.info("Will publish initial stats in #{startup_delay}ms")
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# Publish Home Assistant discovery after MQTT connection
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Process.send_after(self(), :publish_ha_discovery, 1000)
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Logger.info("Will publish HA discovery in 1000ms")
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schedule_stats_publish(mqtt_config.publish_interval)
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{:ok, state_config}
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@ -50,6 +54,14 @@ defmodule Systant.MqttClient do
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end
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end
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def handle_info(:publish_ha_discovery, state) do
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Logger.info("Publishing Home Assistant discovery configuration")
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# Get hostname from system metrics (reuse existing logic)
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stats = Systant.SystemMetrics.collect_metrics(state.app_config)
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Systant.HaDiscovery.publish_discovery(state.mqtt_config.client_id, stats.hostname, state.app_config)
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{:noreply, state}
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end
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def handle_info(:publish_startup_stats, state) do
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Logger.info("Publishing initial system metrics")
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publish_stats(state.app_config, state.mqtt_config)
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@ -88,6 +88,11 @@ password = ""
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# QoS level (0, 1, or 2)
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qos = 0
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# Home Assistant MQTT Discovery Configuration
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[homeassistant]
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discovery_enabled = true # Enable/disable HA auto-discovery
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discovery_prefix = "homeassistant" # HA discovery topic prefix
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[logging]
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# Log level: "debug", "info", "warning", "error"
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level = "info"
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108
server/systant.toml.example
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108
server/systant.toml.example
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# Systant Configuration Example
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# Copy to systant.toml and customize for your environment
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[general]
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enabled_modules = ["cpu", "memory", "disk", "gpu", "network", "temperature", "processes", "system"]
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collection_interval = 30000 # milliseconds
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startup_delay = 5000 # milliseconds
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[mqtt]
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host = "localhost" # MQTT broker hostname/IP
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port = 1883 # MQTT broker port
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client_id_prefix = "systant" # Prefix for MQTT client ID
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username = "" # MQTT username (optional)
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password = "" # MQTT password (optional)
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qos = 0 # MQTT QoS level
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# Home Assistant MQTT Discovery Configuration
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[homeassistant]
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discovery_enabled = true # Enable/disable HA auto-discovery
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discovery_prefix = "homeassistant" # HA discovery topic prefix
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[cpu]
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enabled = true
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[memory]
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enabled = true
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show_detailed = true
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[disk]
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enabled = true
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include_mounts = [] # Only include these mounts (empty = all)
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exclude_mounts = ["/snap", "/boot", "/dev", "/sys", "/proc", "/run", "/tmp"]
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exclude_types = ["tmpfs", "devtmpfs", "squashfs", "overlay"]
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min_usage_percent = 1 # Minimum usage to report
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[gpu]
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enabled = true
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nvidia_enabled = true
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amd_enabled = true
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max_gpus = 8
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[network]
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enabled = true
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include_interfaces = [] # Only include these interfaces (empty = all)
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exclude_interfaces = ["lo", "docker0", "br-", "veth", "virbr"]
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min_bytes_threshold = 1024 # Minimum traffic to report
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[temperature]
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enabled = true
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cpu_temp_enabled = true
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sensors_enabled = true
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temp_unit = "celsius"
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[processes]
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enabled = true
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max_processes = 10
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sort_by = "cpu" # "cpu" or "memory"
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min_cpu_percent = 0.0
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min_memory_percent = 0.0
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max_command_length = 50
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[system]
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enabled = true
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include_uptime = true
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include_load_average = true
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include_kernel_version = true
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include_os_info = true
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[commands]
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enabled = true
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timeout_seconds = 30
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log_executions = true
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# Example commands - customize for your needs
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[[commands.available]]
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trigger = "restart"
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command = "systemctl"
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allowed_params = ["nginx", "apache2", "docker", "ssh"]
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description = "Restart system services"
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[[commands.available]]
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trigger = "info"
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command = "uname"
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allowed_params = ["-a"]
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description = "Show system information"
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[[commands.available]]
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trigger = "df"
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command = "df"
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allowed_params = ["-h", "/", "/home", "/var", "/tmp"]
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description = "Show disk usage"
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[[commands.available]]
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trigger = "ps"
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command = "ps"
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allowed_params = ["aux", "--sort=-pcpu", "--sort=-pmem"]
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description = "Show running processes"
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[[commands.available]]
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trigger = "ping"
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command = "ping"
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allowed_params = ["-c", "4", "8.8.8.8", "google.com", "1.1.1.1"]
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description = "Network connectivity test"
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[logging]
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level = "info" # debug, info, warn, error
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log_config_changes = true
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log_metric_collection = false
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