IoT Engineering

Hands-on of lesson 7

For slides and example code, see lesson 7

Note: Do not work on this repository right away.
Check existing forks to find the specific repository for your class.

a) MQTT command line, 10'

Install the mqtt CLI tool on the Raspberry Pi.
Connect to the broker test.mosquitto.org
Subscribe to the topic fhnw-iot/names
Send your name to the same topic.
(Open a second terminal)

b) MQTT pub/sub clients, 10'

Install the mqtt Node.js library on the Raspberry Pi.
Run the previous MQTT pub/sub client examples.
Use the .js link on each page or check the main repo.
To run a Node.js program my.js, type: $ node my.js

c) Local MQTT broker, 15'

Install and run the mosquitto broker on Raspberry Pi:

$ sudo apt-get update
$ sudo apt-get install mosquitto # port 1883

Test with the ESP8266 publisher/subscriber clients.
Check $SYS/broker/clients/connected on the Pi.
Which use cases would profit from a local broker?

d) Data formats, 15'

Choose one of the Grove sensors listed in the Wiki.
Define a suitable JSON format to transmit its data.
Translate the format into a Protobuf .proto file.
Done? Build the parser for Node.js or Arduino.