Difference: MQTTAndCayenne (1 vs. 2)

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Setting up an IoT

Session3: MQTT and Cayenne

Uli Raich

Formally CERN, Geneva, Switzerland

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

Accessing the WiFi network from Micropython

wifiConnect.png

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

mqttPostOfffice.png

MQTT Demo

mqttDemo.png

The Micropython library

micropython-lib.png

A MQTT example using umqtt.simple

umqttDemo.png

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Slide 1: Title

-- Uli Raich - 2019-05-14

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