OPCUA-Sample

Sample implementation of a OPC-UA Server & Client running in Docker on two Raspberry Pi 4B

Prepare Raspberries

Server

• Create a Raspberry Pi with the latest Version of Raspberry Pi OS Lite (32 bit)
  • Set Hostname to opcua-server
  • Enable SSH
  • Set user:password (admin:foo123)
  • Set WiFi

Client

• Create a Raspberry Pi with the latest Version of Raspberry Pi OS Lite (32 bit)
  • Set Hostname to opcua-client
  • Enable SSH
  • Set user:password (admin:foo123)
  • Set WiFi

Setup on Pi

General Setup Raspberry

• Update & Upgrade

  sudo apt-get update
  sudo apt-get dist-upgrade

• Install Git

  sudo apt install git

• Install Docker

  sudo curl -fsSL https://get.docker.com | sh

• Add a Non-Root User to the Docker Group

  • Add users to the Docker group

    sudo usermod -aG docker admin

  • Check if running

    groups ${USER}

• Install Docker-Compose

  sudo apt-get install -y python3-pip
  sudo pip3 install docker-compose
  docker-compose version

• Clone repository

  git clone https://github.com/FHatCSW/OPCUA-Sample.git

• Install libxml2 and libxslt development package

  sudo apt-get install libxml2
  sudo apt-get install libxslt

• Reboot Raspberry

  sudo reboot

Client

Got to directory

cd /home/admin/OPCUA-Sample/opcua-client

Start docker container

docker-compose up -d

Open your browser

http://opcua-client.local:8000

Define the server address and connect

opc.tcp://<IP OF THE RASPBERRY SERVER>:4840/freeopcua/server/

Server

Got to directory

cd /home/admin/OPCUA-Sample/opcua-server

Start docker container

sudo docker-compose up -d

Git

Useful commands

Stash all local changes on the Raspberry

git stash push --include-untracked

Docker

Useful commands

List all docker containers:

docker container ls -s

find all running docker processes

ps aux | grep docker

... or a certainer container

docker ps -a | grep <certain_container>

Shutdown a certain docker compose process:

docker-compose -f docker-compose<...>.yml down

remove a conatiner

docker rm -f influxdb

Code

Client

Server

https://github.com/FreeOpcUa/python-opcua/blob/master/examples/server-minimal.py