The 'Building Smarter Planet Solutions with MQTT and IBM WebSphere MQ Telemetry' is a kind of book. in this book, with the introduction of MQTT and IBM WebSphere MQ Telemetry as the title. and show how to develop using it.
Applications, Arduino Ethernet, Ethernet Collection, Ethernet Shield, Remote Control, Tutorial, W5100, WebWIZnetMuseum
In doing so you will then be able to turn almost anything on and off as long as you have http access on an Internet-enabled device