const firebase = require("firebase-messaging");

var client = new firebase(CLOUD_MESSAGING_KEY);

var data = {
    title: "@Test",
    content: "@Content"
};

var options = {
	delay_while_idle : true	
};

client.topic("news", data, options, function(result){
	// request err or message id
	console.log(result);	
});

client.message(DEVICE_TOKEN, data);