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Minor example using MQTT and Python.

Requires Mosquitto to be installed.

On Linux with the apt-get package manager:

sudo apt-get install mosquitto
sudo apt-get install mosquitto-clients

Note: mosquitto-clients is to get the mosquitto_pub to make it simple to try stuff from the command line. You could leave it out and only use the supplied publisher.py.

Also install virtualenv if you want to use it (recommended):

sudo apt-get install python-virtualenv

The use of virtualenv is optional but recommended for playing around with this example code.

Simply clone this repo, setup virtualenv and use pip to install requirements.

git clone https://github.com/roppert/mosquitto-python-example.git
cd mqtt-mosquitto-example
virtualenv .
source bin/activate
pip install -r requirements.txt

First start the subscriber which will enter a loop waiting for new messages:

./subscriber.py

Then open a new terminal and send a message:

mosquitto_pub -d -h localhost -q 0 -t adult/pics -m "can i haz moar kittenz"

This should generate a message in the terminal running the subscriber.

Take a look at publisher.py to see how to publish messages using python. Or just open another terminal and run it from command line while subscriber.py is running:

source bin/activate
./publisher.py

See mosquitto-tls on how to generate certificates and keys.

Once created you need to adjust /etc/mosquitto/mosquitto.conf and subscriber.py accordingly and then use mosquitto_pub with cert and key:

mosquitto_pub -d -h localhost --cafile root.ca --cert c1.crt --key c1.key -q 0 -t adult/pics -m "can i haz moar kittenz"

• http://jpmens.net/2013/02/25/lots-of-messages-mqtt-pub-sub-and-the-mosquitto-broker/
• https://www.justinribeiro.com/chronicle/2012/11/08/securing-mqtt-communication-between-ardruino-and-mosquitto/
• http://www.instructables.com/id/USB-RFID-Python-Pub-Sub-MQTT/
• http://mosquitto.org/documentation/python/
• https://pypi.python.org/pypi/paho-mqtt