Robin Newman, who is normally to be found hacking with Sonic Pi, has turned his attention to an online service called Telegram. Using your mobile phone, you can send messages to Telegram which will send them to your Pi which uses the Lua language to read the messages. The Lua and Python scripts then work together to bring about the desired behaviour – in this instance Robin is using LEDs and a buzzer from CamJam EduKit 2 and also the PiCamera. Read all about it and learn how to do it by following his tutorial.