PubNub is a cloud-based, real-time messaging service that functions on mobile phones, tablets, TVs, HTML5 web browsers and game consoles. It is a Push technology intended specifically for high-message-volume applications and games. The API allows users to publish and subscribe to messages. V2 of this API contains methods to retrieve Presence (who is on a what channel, when, and status), fetch message history, and manage metadata objects. It uses HTTP calls and responses are formatted in JSON and JSONP.
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According to Gartner, there will be nearly 21 billion devices connected to the Internet by the year 2020. That’s a lot of devices that need to be connected in useful ways. This article shows you the steps to make a Raspberry Pi speak from anywhere in the world using Node.js and PubNub.