speech-on-google-home.js

const { Client, DefaultMediaReceiver } = require('castv2-client');
const googleTTS = require('google-tts-api');

const address = '192.168.1.86';
const message = {
  language: undefined, // default: 'en'
  body: 'Hello World!',
  speed: undefined, // default: 1
  timeout: undefined, // default: 1000
};

const connect = (host, callback) => (new Promise((resolve, reject) => {
  const client = new Client();

  client.connect(host, () => {
    callback(client, (status) => {
      client.close();
      resolve(status);
    });
  });

  client.on('error', (error) => {
    client.close();
    reject(error);
  });
}));

const getSpeechUrl = async (text) => {
  const url = await googleTTS(
    text,
    message.language,
    message.speed,
    message.timeout,
  );
  return url;
};

const speech = (client, speechUrl) => (new Promise((resolve, reject) => {
  client.launch(DefaultMediaReceiver, (error, player) => {
    if (error) {
      reject(error);
    }

    const media = {
      contentId: speechUrl,
      contentType: 'audio/mp3',
      streamType: 'BUFFERED',
    };

    player.load(media, { autoplay: true }, (playerError, status) => {
      if (playerError) {
        reject(playerError);
      }

      resolve(status);
    });
  });
}));

const main = async () => {
  const result = await connect(address, async (client, done) => {
    const speechUrl = await getSpeechUrl(message.body);
    const status = await speech(client, speechUrl);
    done(status);
  });
  return result;
};

main()
  .then((status) => console.log('done', status))
  .catch((error) => console.error(error));