Visit this page for more informations: https://github.com/Momy93/NubChat
NubChat is an app that let communicate with human and devices! All you have to do is to create an account on pubnub.com and get your API keys.
You can create public channels (chats) to share informations with different devices or private chats.
Devices can be an actual android smartphone or a dev board like Arduino, RaspberryPi, Particle....and all devices that support PubNub API's.