Book Image

MQTT Essentials - A Lightweight IoT Protocol

5 (1)
Book Image

MQTT Essentials - A Lightweight IoT Protocol

5 (1)

Overview of this book

This step-by-step guide will help you gain a deep understanding of the lightweight MQTT protocol. We’ll begin with the specific vocabulary of MQTT and its working modes, followed by installing a Mosquitto MQTT broker. Then, you will use best practices to secure the MQTT Mosquitto broker to ensure that only authorized clients are able to publish and receive messages. Once you have secured the broker with the appropriate configuration, you will develop a solution that controls a drone with Python. Further on, you will use Python on a Raspberry Pi 3 board to process commands and Python on Intel Boards (Joule, Edison and Galileo). You will then connect to the MQTT broker, subscribe to topics, send messages, and receive messages in Python. You will also develop a solution that interacts with sensors in Java by working with MQTT messages. Moving forward, you will work with an asynchronous API with callbacks to make the sensors interact with MQTT messages. Following the same process, you will develop an iOS app with Swift 3, build a website that uses WebSockets to connect to the MQTT broker, and control home automation devices with HTML5, JavaScript code, Node.js and MQTT messages
Table of Contents (16 chapters)
MQTT Essentials - A Lightweight IoT Protocol
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Test your knowledge

  1. The CocoaMQTT client library is written in:

    1. Objective-C.

    2. Swift 2.

    3. Swift 3.

  2. In the CocoaMQTT client library, a CocoaMQTT instance represents:

    1. The synchronous MQTT over WebSockets client.

    2. The asynchronous MQTT over WebSockets client.

    3. The asynchronous MQTT over TCP client (no WebSockets).

  3. Which of the following methods does the CocoaMQTT client call after a message is received from the MQTT server?

    1. func mqtt(_ mqtt: CocoaMQTT, didReceiveMessage message: CocoaMQTTMessage, id: UInt16 ) {.

    2. func didReceiveMessage(_ mqtt: CocoaMQTT, message: CocoaMQTTMessage, id: UInt16 ) {.

    3. func mqtt(didReceiveMessage message: CocoaMQTTMessage, id: UInt16 ) {.

  4. Which of the following properties of a CocoaMQTTMessage instance provides the string representation of the message's payload?

    1. Payload.

    2. payloadString.

    3. String.

  5. Which of the following properties of a CocoaMQTTMessage instance provides the message's destination topic?

    1. topic.

    2. topicString.

    3. String.