Setting up an IoT

Session 3: MQTT and Cayenne

Uli Raich

Formally CERN, Geneva, Switzerland

Slide 1 of 8

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 2 of 8

Accessing the WiFi network

Slide 3 of 8

Accessing the WiFi network from Micropython

Slide 4 of 8

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 of 8

MQTT Demo

Slide 6 of 8

The Micropython library

Slide 7 of 8

A MQTT example using umqtt.simple

Slide 8 of 8

-- Uli Raich - 2019-05-14

Comments

I	Attachment	History	Action	Size	Date	Who
odp	afnog19-ws-session3.odp	r1	manage	5245.0 K	2019-05-15 - 19:13	UliRaich
png	micropython-lib.png	r1	manage	75.2 K	2019-05-14 - 17:31	UliRaich
png	mqttDemo.png	r1	manage	191.3 K	2019-05-14 - 17:23	UliRaich
png	mqttExample.png	r2 r1	manage	73.2 K	2019-05-15 - 16:12	UliRaich
png	mqttPostOfffice.png	r1	manage	50.2 K	2019-05-14 - 17:18	UliRaich
png	realData.png	r1	manage	27.7 K	2019-05-15 - 17:12	UliRaich
png	umqttDemo.png	r2 r1	manage	72.2 K	2019-05-14 - 17:38	UliRaich
png	wifiConnect.png	r1	manage	128.4 K	2019-05-14 - 17:18	UliRaich
png	wifiDemoCode.png	r1	manage	43.8 K	2019-05-15 - 16:14	UliRaich

This topic: AFNOG > WebHome > AFNOGWorkshop2019 > AFNOG-2019Slides > WorkshopSlides > MQTTAndCayenne
Topic revision: r4 - 2019-05-15 - UliRaich

Session 3: MQTT and Cayenne

Uli RaichFormally CERN, Geneva, Switzerland

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Uli Raich

Formally CERN, Geneva, Switzerland