How to connect OPC-UA server

• Device information
• Step 1. Configuring the OPC-UA connector
• Step 3. Turn on the connector
• Step 4. Run the gateway
• Step 5. Check information from device

Device information

For the purpose of this guide, we will use Raspberry Pi with OPC-UA server.
We will use OPC-UA connector to collect data.

The info available at this moment:

We want to write Humidity ( relative path is ${humidity_value} ) as the telemetry to ThingsBoard and batteryLevel ( relative path is ${Battery.Level} ) as the device client-side attribute.

Step 1. Configuring the OPC-UA connector

In order to configure the connector, we must create OPC-UA setup file and put configuration there. You may use default opcua.json file (from /etc/thingsboard-gateway/config in case of daemon installation or from folder with tb_gateway.json file in case you use python package).
Simply replace some parameters with our values. For example:

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{
  "server": {
    "name": "OPC-UA Default Server",
    "url": "192.168.1.113:4840/server/",
    "scanPeriodInMillis": 10000,
    "timeoutInMillis": 5000,
    "security": "Basic128Rsa15",
    "identity": {
      "type": "anonymous"
    },
    "mapping": [
      {
        "deviceNodePattern": "Device\\d*$",
        "deviceNamePattern": "${server.deviceName}",
        "attributes": [
          {
            "key": "batteryLevel",
            "path": "${Battery.Level}"
          }
        ],
        "timeseries": [
          {
            "key": "Humidity",
            "path": "${humidity_value}"
          }
        ]
      }
    ]
  }
}

About sections of OPC-UA configuration file you can read more here.

Let’s analyze our settings:

1. General configuration of connector. In this section we have defined main settings (e. g. connector name — OPC-UA Default Server, url — 192.168.1.113:4840/server/ etc.). You can read more about available parameters here.
2. General device configuration. In this section we have defined main settings of our OPC-UA device (e. g. device object in OPC-UA server pattern - Device\d$, device name pattern within ThingsBoard — Device\d$ etc.). You can read more about available parameters here.
3. Attributes configuration. In this section we have defined the settings for batteryLevel attribute within ThingsBoard. You can read more about available parameters here.
4. Timeseries configuration. In this section we set up temperature and humidity parameters. You can read more about available parameters here.

Save the configuration file as opcua.json in configuration folder (the directory, that contains the general configuration file - tb_gateway.yaml).

Step 3. Turn on the connector

To use the connector, we must turn it on in the main configuration file (tb_gateway.yaml)

In “connectors” section we should uncomment following strings:

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  -
    name: OPC-UA Connector
    type: opcua
    configuration: opcua.json

Step 4. Run the gateway

Command for run depends on type of installation.
If you have installed the gateway as daemon, run the following command:

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sudo systemctl restart thingsboard-gateway

If you have installed the gateway as a python module (using pip package manager or from sources), use following command or script to run the gateway.
Notice: You must place correct path to the main configuration file (tb_gateway.yaml) in the command/script.

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sudo python3 -c 'from thingsboard_gateway.gateway.tb_gateway_service import TBGatewayService; TBGatewayService("YOUR_PATH_HERE")'

or script:

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from thingsboard_gateway.gateway.tb_gateway_service import TBGatewayService 

config_file_path = "YOUR_PATH_HERE"

TBGatewayService(config_file_path)

Step 5. Check information from device

Check data in your ThingsBoard instance.
- Go to the your ThingsBoard instance and login.
- Go to the “Devices” tab. “Humidity Sensor” will be there.

Go to the device details, ATTRIBUTES tab, there you may see the attribute batteryLevel with some value.



Go to the device details, LATEST TELEMETRY tab, to see your telemetries data: Humidity with some value.