KNX Input Plugin

This service plugin listens for messages on the KNX home-automation bus by connecting via a KNX-IP interface. Information about supported KNX datapoint-types can be found at the underlying knx-go project.

Introduced in: Telegraf v1.19.0 Tags: iot OS support: all

Service Input

This plugin is a service input. Normal plugins gather metrics determined by the interval setting. Service plugins start a service to listen and wait for metrics or events to occur. Service plugins have two key differences from normal plugins:

1. The global or plugin specific interval setting may not apply
2. The CLI options of --test, --test-wait, and --once may not produce output for this plugin

Global configuration options

Plugins support additional global and plugin configuration settings for tasks such as modifying metrics, tags, and fields, creating aliases, and configuring plugin ordering. See CONFIGURATION.md for more details.

Configuration

# Listener capable of handling KNX bus messages provided through a KNX-IP Interface.
[[inputs.knx_listener]]
  ## Type of KNX-IP interface.
  ## Can be either "tunnel_udp", "tunnel_tcp", "tunnel" (alias for tunnel_udp) or "router".
  # service_type = "tunnel"

  ## Address of the KNX-IP interface.
  service_address = "localhost:3671"

  ## Measurement definition(s)
  # [[inputs.knx_listener.measurement]]
  #   ## Name of the measurement
  #   name = "temperature"
  #   ## Datapoint-Type (DPT) of the KNX messages
  #   dpt = "9.001"
  #   ## Use the string representation instead of the numerical value for the
  #   ## datapoint-type and the addresses below
  #   # as_string = false
  #   ## List of Group-Addresses (GAs) assigned to the measurement
  #   addresses = ["5/5/1"]

  # [[inputs.knx_listener.measurement]]
  #   name = "illumination"
  #   dpt = "9.004"
  #   addresses = ["5/5/3"]

Related tools

• knx-telegraf-config-generator: generates a Telegraf configuration from a KNX project file

Measurement configurations

Each measurement contains only one datapoint-type (DPT) and assigns a list of addresses to this measurement. You can, for example group all temperature sensor messages within a “temperature” measurement. However, you are free to split messages of one datapoint-type to multiple measurements.

Metrics

Received KNX data is stored in the named measurement as configured above using the “value” field. Additional to the value, there are the following tags added to the datapoint:

• groupaddress: KNX group-address corresponding to the value
• unit: unit of the value
• source: KNX physical address sending the value

To find out about the datatype of the datapoint please check your KNX project, the KNX-specification or the “knx-go” project for the corresponding DPT.

Example Output

This section shows example output in Line Protocol format.

illumination,groupaddress=5/5/4,host=Hugin,source=1.1.12,unit=lux value=17.889999389648438 1582132674999013274
temperature,groupaddress=5/5/1,host=Hugin,source=1.1.8,unit=°C value=17.799999237060547 1582132663427587361
windowopen,groupaddress=1/0/1,host=Hugin,source=1.1.3 value=true 1582132630425581320