Build Instructions

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• 1

  Get your Raspberry Pi ready

  In my case, I lacked all the peripherals (mouse, keyboard, monitor), so I followed this tutorials to get the Pi to run without. 

  https://medium.com/@viveks3th/how-to-bootstrap-a-headless-raspberry-pi-with-a-mac-6eba3be20b26

• 2

  Download Mosquitto

  Copy paste this into the terminal:

  curl -O http:<a target="_blank" rel="noopener noreferrer" href="<a target="_blank" rel="noopener noreferrer" href="<a target="_blank" rel="noopener noreferrer" href="//repo.mosquitto.org/debian/mosquitto-repo.gpg.key">//repo.mosquitto.org/debian/mosquitto-repo.gpg.key</a>"">//repo.mosquitto.org/debian/mosquitto-repo.gpg.key">//repo.mosquitto.org/debian/mosquitto-repo.gpg.key</a>"</a>><a target="_blank" rel="noopener noreferrer" href="<a target="_blank" rel="noopener noreferrer" href="//repo.mosquitto.org/debian/mosquitto-repo.gpg.key">//repo.mosquitto.org/debian/mosquitto-repo.gpg.key</a>"><a target="_blank" rel="noopener noreferrer" href="//repo.mosquitto.org/debian/mosquitto-repo.gpg.key">//repo.mosquitto.org/debian/mosquitto-repo.gpg.key</a></a></a>
sudo apt-key add mosquitto-repo.gpg.key
rm mosquitto-repo.gpg.key
cd /etc/apt/sources.list.d/
sudo curl -O http:<a target="_blank" rel="noopener noreferrer" href="<a target="_blank" rel="noopener noreferrer" href="<a target="_blank" rel="noopener noreferrer" href="//repo.mosquitto.org/debian/mosquitto-jessie.list">//repo.mosquitto.org/debian/mosquitto-jessie.list</a>"">//repo.mosquitto.org/debian/mosquitto-jessie.list">//repo.mosquitto.org/debian/mosquitto-jessie.list</a>"</a>><a target="_blank" rel="noopener noreferrer" href="<a target="_blank" rel="noopener noreferrer" href="//repo.mosquitto.org/debian/mosquitto-jessie.list">//repo.mosquitto.org/debian/mosquitto-jessie.list</a>"><a target="_blank" rel="noopener noreferrer" href="//repo.mosquitto.org/debian/mosquitto-jessie.list">//repo.mosquitto.org/debian/mosquitto-jessie.list</a></a></a>
sudo apt-get update
sudo apt-get install mosquitto mosquitto-clients

  Credit goes to @Elliot Williams for putting this together/ writing this.

  and then:

  sudo wget http://repo.mosquitto.org/debian/mosquitto-stretch.list
  sudo rm mosquitto-jessie.list
  

• 3

  MQTT Terms - broker (server), client, topic, publish, subscribe, unsubscribe

  Thanks to @bald engineer https://www.baldengineer.com/mqtt-introduction.html

  Message Broker Introduction

  A messaging broker system is a publish/subscribe protocol based on a “hub and spoke” model. Great. What does that mean? First some terms and then an analogy.

  Message Brokering Basic Terms

  1. Broker: The broker accepts messages from clients and then delivers them to any interested clients. Messages belong to a topic. (Sometimes brokers are called “servers.”)
  2. Client: A “device” that either publishes a message to a topic, subscribes to a topic, or both.
  3. Topic: A namespace (or place) for messages on the broker. Clients subscribe and publish to a topic.
  4. Publish: A client sending a message to the broker, using a topic name.
  5. Subscribe: A client tells the broker which topics interest it. Once subscribed, the broker sends messages published to that topic. (In some configurations the broker sends “missed” messages.) A client can subscribe to multiple topics.
  6. Unsubscribe: Tell the broker you are bored with this topic. In other words, the broker will stop sending messages on this topic.

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