This is the project page for the corresponding video on YouTube
Links
The images can be found here
https://www.raspberrypi.org/downloads/raspbian/
The SD card writing tool which also writes the boot sectors can be downloaded from here:
Setup
To install the broker you need to run the two following lines from the terminal on your raspberry:
sudo apt-get update sudo apt-get install mosquitto
The IP address can be determined by typing the command:
ifconfig
To add users and passwords you need to got to the directory:
cd /etc/mosquitto
There you can create a password file by adding the first user like this:
sudo mosquitto_passwd -c passwordfile luni
Appending another user to an existing password file can be done like this:
sudo mosquitto_passwd -b passwordfile user password
Removing a user from the file is done like this:
sudo mosquitto_passwd -D passwordfile user
Anonymous access has to be deactivated an the password file has to be added in the mosquitto.conf:
allow_anonymous false password_file /etc/mosquitto/passwordfile
In Raspbian there is the nano editor pre-installed so you can open the file like this:
sudo nano mosquitto.conf
After adding the two lines from above you can exit nano by pressing Ctrl+O and Enter to save the changes ans Ctrl-X to quit.
To get a fixed IP address you need to configure your DHCP server on your router.
You simply need to add the MAC address of the raspberry with the IP you like.
Sorry no detailed steps here since every router is different. The manual might help.
Code
There are two Mongoose OS apps mentioned which can be downloaded from this repository:
https://github.com/bitluni/MongooseApps
One is a simple MQTT test. It is one code which let’s two programmed nodes decide which one of these are Ping and which Pong and then they start to play.
The Main Switch app is an update of an older projects. It switches pin D4 in the WeMos over MQTT.
Mongoose OS can be found here:
Android App
The used MQTT App on my Android phone was MQTT Dash
https://play.google.com/store/apps/details?id=net.routix.mqttdash
This app is missing widgets but seem to support even images.. Not sure if I’ll stick to it as we proceed in the series.
Parts
Raspberry Pi on Ebay:
http://ebay.to/2yjS5Dc
…and on Amazon:
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