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README.md

Lesson 5: Paho and Crossbar.io

Lab 5A: Eclipse Mosquitto and Eclipse Paho

On Windows, download and install Mosquitto

  • Go to System Properties > Environment Variables > Path > New, and enter C:\Program Files\Mosquitto

On macOS, install and start Mosquitto with

brew install mosquitto
brew services start mosquitto

On Raspberry Pi, install and run Mosquitto to subscribe on one terminal and publish on another

$ sudo apt update
$ sudo apt install mosquitto mosquitto-clients
$ mosquitto_sub -h localhost -v -t "\$SYS/#"
  • Press control-c to stop mosquitto_sub
$ service mosquitto status
$ netstat -tln

Terminal 1

$ mosquitto_sub -h localhost -v -t test/topic &

Terminal 2

$ mosquitto_pub -h localhost -t test/topic -m "Hello"

Intall Paho and run code to subscribe on one terminal and publish on another

$ sudo pip3 install -U paho-mqtt
$ git clone https://github.com/eclipse/paho.mqtt.python.git
$ cd ~/iot/lesson5
$ python3 client.py

Terminal 1 (press control-c to stop)

$ python3 sub.py

Terminal 2

$ python3 pub.py

Terminal 1 (press control-c to stop)

$ python3 sub-multiple.py

Terminal 2

$ python3 pub-multiple.py

Terminal 1 (press control-c to stop)

$ python3 subcpu.py

Terminal 2

$ python3 pubcpu.py

On Raspberry Pi OS (Bullseye), change /opt/vc/bin/vcgencmd to /usr/bin/vcgencmd in system_info.py

  • Copy ~/iot/lesson5/system_info.py to ~/demo
  • Copy ~/iot/lesson5/subraspi.py to ~/demo
  • Copy ~/iot/lesson5/pubraspi.py to ~/demo
  • Replace topic "Raspberry Pi" with a unique hostname in both subraspi.py and pubraspi.py
  • Run subraspi.py on Terminal 1 and pubraspi.py on Terminal 2

Terminal 1 (press control-c to exit)

$ cd ~/demo
$ cp ~/iot/lesson5/subraspi.py .
$ nano subraspi.py
$ python3 subraspi.py

Terminal 2 on Raspberry Pi or another computer (press control-c to exit)

$ cd ~/demo
$ cp ~/iot/lesson5/system_info.py .
$ cp ~/iot/lesson5/pubraspi.py .
$ nano pubraspi.py
$ python3 pubraspi.py

Optional Lab 5B: Crossbar.io

Docker Get Started includes

  • Docker Desktop download for macOS or Windows
  • Docker Engine for Linux (CentOS, Debian, Fedora, Raspberry Pi OS, and Ubuntu)
$ docker version
$ docker images
$ docker 
$ docker run --rm hello-world
$ docker run -it ubuntu bash
# pwd
# ls
# cat /etc/os-release
# date
# exit

On Raspberry Pi, install Docker

  • Install Docker on Raspberry Pi OS by following these instructions
  • Run cURL to download data from example.com with or without the progress meter
  • Run Docker commands and hello-world
  • Add pi to the Docker group as a non-root user, logout SSH, and reconnect SSH for this to take effect
$ man curl
$ curl example.com
$ curl -o example.txt example.com
$ cat example.txt
$ sudo docker version
$ sudo docker images
$ sudo docker run --rm hello-world
$ sudo docker images
$ sudo usermod -aG docker pi
$ logout

Run Crossbar.io router on Raspberry Pi Terminal 1

$ git clone https://github.com/crossbario/crossbar-examples
$ cd crossbar-examples/getting-started
$ tree
$ docker pull crossbario/crossbar-armhf
$ docker run -v $PWD:/node -u 0 --rm --name=crossbar -it -p 8080:8080 crossbario/crossbar-armhf
  • Open a browser and go to 192.168.x.xxx:8080/info (or 127.0.0.1:8080/info via VNC Viewer) to view the Crossbar.io node information

Run publish-client on Raspberry Pi Terminal 2

$ sudo pip3 install -U autobahn[twisted,encryption,serialization,xbr]
$ cd crossbar-examples/getting-started
$ cd .crossbar
$ ls
$ cat config.json
$ cd ..
$ cd 1.hello-world
$ python3 client_component_publish.py

Run subscribe-client on Raspberry Pi Terminal 3

$ cd crossbar-examples/getting-started/1.hello-world/
$ python3 client_component_subscribe.py
  • Press control-c to stop subscribe-client > publish-client > router