Node OPC UA MQTT Gateway

Description

The Bufferstack.IO OPC UA MQTT Gateway is an IIoT Gateway application that facilitates communication between an OPC UA server and an MQTT broker. This application allows you to read and write data from an OPC UA server using MQTT, enabling seamless integration of industrial automation data into IoT applications.

Features

• Connects to an OPC UA server and retrieves data.
• Publishes data to an MQTT broker.
• Supports both reading from and writing to the OPC UA server via MQTT.
• Configurable via a config.toml file for easy setup.

Installation

1. Clone the repository:

   git clone https://github.com/hj91/node-opcua-mqtt-gateway.git
   cd node-opcua-mqtt-gateway

2. Install dependencies:

   npm install

3. Generate SSL certificates (if necessary):

     1.  mkdir -p ./certs/own/certs ./certs/own/private
     2. openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ./certs/own/private/private_key.pem -out ./certs/own/certs/client_selfsigned_cert.pem -subj "/CN=NodeOPCUAClient" -extensions san -config <(cat /etc/ssl/openssl.cnf \
    <(printf "[san]\nsubjectAltName=URI:urn:iiot-gateway:NodeOPCUA-Client"))

4. Configure the application: Edit the config.toml file to set up the OPC UA and MQTT connection settings.

Configuration

config.toml

Here’s a sample configuration file:

# OPC UA connection settings
[opcua]
url = "opc.tcp://192.168.1.43:49320/KEPServerEX"
user = ""
pass = ""

# MQTT connection settings
[mqtt]
host = "localhost"
port = 1883
username = ""
password = ""

# Metrics to collect
[[metrics]]
datatype = "number"
tags = { machine = "machine_1", fields = "valid_job" }
nodeId = "ns=2;s=Painting.MachineID.Valid_job"
interval = 1000
topic = "painting/machineID/valid_job"
mode = "pub"
# Options: pub, sub, pubsub

[[metrics]]
datatype = "number"
tags = { machine = "machine_2", fields = "invalid_job" }
nodeId = "ns=2;s=Painting.MachineID.Invalid_job"
interval = 1000
topic = "painting/machineID/invalid_job"
mode = "pubsub"
# Options: pub, sub, pubsub

Usage

To start the application, run:

npm start

The application will connect to the OPC UA server, retrieve specified metrics, and publish them to the configured MQTT topics.

Docker

To run the dockerized version of application, run:

docker run -d   -v ./certs:/app/certs   -v ./config:/app/config   --name opcua-mqtt-gateway   node-opcua-mqtt-gateway

License

This project is licensed under the GPL-3.0 License. See the LICENSE file for details.

Author

Harshad Joshi
GitHub: hj91