blog/source/docs/sending_and_receiving_messages.md

title: Sending and Receiving messages layout: docs

listening to messages

EmbarkJS.Messages.listenTo({topic: ["topic1", "topic2"]}).then(function(message) {
  console.log("received: " + message);
})

sending messages

You can send plain text

EmbarkJS.Messages.sendMessage({topic: "sometopic", data: 'hello world'})

Or an object

EmbarkJS.Messages.sendMessage({topic: "sometopic", data: {msg: 'hello world'}})

Note: array of topics are considered an AND. In Whisper you can use another array for OR combinations of several topics e.g ["topic1", ["topic2", "topic3"]] => topic1 AND (topic2 OR topic 3)

Setup

By default Embark will automatically initialize EmbarkJS with the provider configured at config/communication.js. However if you are using EmbarkJS directly or wish to change the provider configuration on the fly you can do:

EmbarkJS.Messages.setProvider('whisper')