This is an initial exploration of MQTT libraries available for Golang.
This just runs a simple publisher and subscriber to a single topic. Messages are published every 5 seconds, and the subscriber prints it out.
This demo only has three configuration options, via environment variables, and assumes a TCP connection to the broker.
MQTTDEMO_HOST is the hostname of the broker (localhost)
MQTTDEMO_PORT is the port of the broker (1883)
MQTTDEMO_TOPIC is the topic the application uses (super_cool_topic)