This is my first post on home automation. As a 'Hello World' project, switching on/off a bulb is a common use case. This post is not an exception. But to spice it up, we'll use MQTT (MQ Telemetry Transport) - a machine-to-machine (M2M)/Internet of Things (IOT) connectivity protocol and an android app (IoT MQTT Dashboard). Bulb is merely a symbolic representation of an electrical device. We can practically control any device (Internet of Things) over internet.