As we conclude, here is a list of questions for you to test your knowledge regarding this chapter's material. You will find the answers in the Assessments section of the book:
- What is MQTT?
- Your retained MQTT messages never get delivered. What should you check?
- Under what condition will an MQTT broker publish a Will message?
- You choose to use MQTT as your IoT application's messaging layer and must ensure that messages are sent and received. What is the minimum QoS level required?
- You develop an application using MQTT and use the Mosquitto broker, but now you need to use a different broker. What does this mean for your code base and deployment configuration?
- Where in code (hint: which handler method) should you subscribe to MQTT topics and why?
