mqtt-to-rdf v0.1.0

mqtt-to-rdf

Forwards MQTT messages to a RDF store

mqtt-to-sparql

mqtt-to-sparql is a command line program which forwards MQTT messages to a SPARQL endpoint. The following command line options are supported:

• --config: Path to a JSON config file.
• --baseUrl: Base URL which will be prepended to the MQTT topic.
• --broker: URL of the MQTT broker. If this parameter is not given a MQTT server will be started.
• --endpoint: URL to the SPARQL update endpoint.

config

The config file must be a JSON file. JavaScript style comments are allowed. The following properties are supported:

• broker: URL of the MQTT broker. If this property is not set and the parameter is not given a MQTT server will be started.
• baseUrl: Base URL which will be prepended to the MQTT topic.
• containerPath: Path for the cronify container (default: history/).
• sparqlEndpointUrl: URL to the SPARQL update endpoint.
• rewrite: Rewrite rules for the topic. If a map property is given, the object will be used to do a 1:1 mapping. Example:

  "rewrite": {
    "map": {
      "/home/0/2": "/bedroom/thermometer"
    }
  }

• properties: Merge additional properties to the message. The value of the global property will be merged to all messages. It can be used to add a JSON-LD context. Example:

  "properties": {
    "global": {
      "@context": {
        "@vocab": "http://ns.bergnet.org/dark-horse#"
      }
    }
  }

The topics property can be used to merge topic specific values to the message. Example:

  "properties": {
    "topics": {
      "/bedroom/thermometer": {
        "@type": "Thermometer"
      }
    }
  }