Chapter 14

1. The use of PyPubSub was a design decision to decouple MQTT-related code and logic from hardware control code and logic, with the goal of making the code cleaner and easier to maintain.
2. The commands you speak when using the Google Assistant app are shown on your device as text, so it's easy to see how Google Assistant heard your spoken commands, and what was sent as textual commands to your IFTTT Applet.
3. You will need to build an integration service that marshals data between MQTT and the RESTful APIs (or, alternatively, identify a thirty-party service that does this – for example, check out https://io.adafruit.com and their IFTTT service). IFTTT offers RESTful webhooks as an option to build custom integrations, however, it does not offer an MQTT option. 
4. One option is to use MQTT, just like the example we covered in this chapter. If you connect multiple IoTrees using MQTT to a central MQTT broker, they all...