influx-opcua-server

A simple server for exposing data inside InfluxDB over OPCUA, brought to you by factry.

Purpose

This project was built as a proof of concept to get data in InfluxDB (for example the result of some event processing algorithm) back to the automation layer. OPCUA is the de facto protocol to use.

How it works / assumptions

This server takes a config file in which you specify which measurements in InfluxDB you want to expose. The application assumes that there is only 1 retention policy in the DB (for now) For each measurement, the last values of each individual series/field combination will be exposed in the OPCUA namespace like this:

Objects
  |- Database1
  |   |- Measurement1
  |       |- Tag1=Tag1Value1,Tag2=Tag2Value1
  |       |   |- Field1.last
  |       |   |- Field2.last
  |       |- Tag1=Tag1Value2,Tag2=Tag2Value1
  |           |- Field1.last
  |           |- Field2.last
  |- Database2
      |- Measurement1
         ...

How to run it

TODO: provide ready-to-run packages for each OS.

This project requires node v8 or highter.

1. Clone it!
2. npm install
3. Create a JSON config file (see below)
4. Set the path to this config file in the environment variable CONFIG_PATH
5. node index.js

The config file

You can find an example config file in /example_config

opcua

Some settings for running the OPCUA server:

• port: The port to run on.
• user: The user for basic auth on the server. When empty, anonymous access is allowed.
• pass: The password for basic auth.

influx

The connection details for influxDB:

• protocol: http or https, defaults to http
• host: defaults to localhost
• port: defaults to 8086,
• user: ..
• pass: ..
• database: ..

measurementsToExpose

An array of measurents to expose on the OPCUA server.

• name: the name of the measurement
• database: (optional) the database, if different from the default.

Contributing

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request

Credits

• Jeroen Coussement - @coussej - coussej.github.io - factry.io
• Etienne Rossignon - @gadz_er - for creating the fantastic node-opcua library.

License

MIT