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MQTT Essentials - A Lightweight IoT Protocol

You're reading from   MQTT Essentials - A Lightweight IoT Protocol Send and receive messages with the MQTT protocol for your IoT solutions.

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Product type Paperback
Published in Apr 2017
Publisher Packt
ISBN-13 9781787287815
Length 280 pages
Edition 1st Edition
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Author (1):
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Gaston C. Hillar Gaston C. Hillar
Author Profile Icon Gaston C. Hillar
Gaston C. Hillar
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Toc

Table of Contents (8) Chapters Close

Preface 1. Lightweight Messaging with MQTT 3.1.1 and Mosquitto FREE CHAPTER 2. Securing an MQTT Mosquitto Server 3. Controlling a Drone with Python 4. Interacting with Sensors in Java 5. Controlling Home Automation in JavaScript 6. Interacting with Actuators in Swift A. Exersise Answers

Understanding the CocoaMQTT client in Swift 3


The CocoaMQTT client is very easy to use. First, it is necessary to import CocoaMQTT, create an instance of the CocoaMQTT class, specify the MQTT connection configuration values, and indicate an instance of a class that conforms to the CocoaMQTTDelegate protocol. We can call the methods for the created CocoaMQTT instance to subscribe to topics and publish messages.

Let's take a look at the code that declares the CocoaMQTTDelegate protocol:

@objc public protocol CocoaMQTTDelegate {
    func mqtt(_ mqtt: CocoaMQTT, didConnect host: String, port: Int)
    func mqtt(_ mqtt: CocoaMQTT, didConnectAck ack: CocoaMQTTConnAck)
    func mqtt(_ mqtt: CocoaMQTT, didPublishMessage message: CocoaMQTTMessage, id: UInt16)
    func mqtt(_ mqtt: CocoaMQTT, didPublishAck id: UInt16)
    func mqtt(_ mqtt: CocoaMQTT, didReceiveMessage message: CocoaMQTTMessage, id: UInt16 )
    func mqtt(_ mqtt: CocoaMQTT, didSubscribeTopic topic: String)
    func mqtt(_ mqtt: CocoaMQTT...
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