WAGO 750-881 PLC uses an open source MQTT library to communicate with an rPi to display a temperature measurement on a Sense Hat using Python.


Raspberry Pi DIN Rail Mount:
http://www.dinrplate.com/

Commands to install Mosquitto:
pi@raspberrypi:~ $ sudo apt-get update
pi@raspberrypi:~ $ wget http://repo.mosquitto.org/debian/mosq...
pi@raspberrypi:~ $ sudo apt-key add mosquitto-repo.gpg.key
pi@raspberrypi:~ $ cd /etc/apt/sources.list.d/
pi@raspberrypi:~ $ sudo wget http://repo.mosquitto.org/debian/mosq...
pi@raspberrypi:~ $ sudo apt-get update
pi@raspberrypi:~ $ sudo apt-get upgrade
pi@raspberrypi:~ $ sudo apt-get install mosquito mosquitto-clients