send_to_device.js

const admin = require('firebase-admin');

(async () => {
    admin.initializeApp();

    const message = {
        data: {
            time: '1:15 PM',
            symbol: 'GOOG',
            value: '1184.46'
        },
        token: '<device_registration_token>',
    };
    await admin.messaging().send(message);
})();