Slide 1: Setting up an IoT

Session3: MQTT and Cayenne

Uli Raich

Formally CERN, Geneva, Switzerland

Slide 2: The Network Layers

The WeMos D1 mini has a built-in WiFi interface

In order to communicate with other IoT nodes we must therefore connect to the WiFi network first

On top of WiFi we will run a TCP session

On top of TCP we will run the MQTT protocol

On top of MQTT we have dedicated topics and payloads imposed by Cayenne

Slide 3: Accessing the WiFi network from Micropython

Slide 4: MQTT

MQTT (Message Queuing Telemetry Transport: a publish-subscribe based

message protocol running of top of TCP.

A processor can subscribe to messages of a certain “topic” and/or it can push its

results on a certain topic

Slide 5: MQTT Demo

Slide 6: The Micropython library

Slide 7: A MQTT example using umqtt.simple

-- Uli Raich - 2019-05-14

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