Tag Archives: OPC UA

Bring MQTT Payload to OPC UA?

 I wanted to get my Home-Automation values to SCADA, it’s a “self-made” JSON message format. I tried it with Ignition and the MQTT Module. Btw.: it’s great that they have the Makers Edition for non-commercial use at home 👍. But I don’t know why, it only got one topic and one value from my MQTT Broker, and it did not receive any updates. Don’t know what went wrong…

Anyhow, I decided to add a custom JSON format to the Automation-Gateway.com. It’s simple, just define the JSON-Path to the value and optionally to a timestamp in milliseconds since epoch or to an ISO 8601 format.

Now I can use the Automation-Gateway’s OPC UA server in any SCADA system to visualize my MQTT values…

Here is the config.yaml configuration file for the Automation-Gateway.

    - Port: 4841
      Enabled: true
      LogLevel: INFO
        - Topic: mqtt/home/path/Original/#
    - Id: "home"
      LogLevel: INFO
      Port: 1883
      Format: Json
          Value: "Value"
          TimestampMs: "TimeMS"