CocoaMQTT

MQTT v3.1.1 and v5.0 client library for iOS/macOS/tvOS written with Swift 5

Build

Build with Xcode 11.1 / Swift 5.1

IOS Target: 12.0 or above OSX Target: 10.13 or above TVOS Target: 10.0 or above

xcode 14.3 issue:

File not found: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/arc/libarclite_iphonesimulator.a

If you encounter the issue, Please update your project minimum depolyments to 11.0

Installation

CocoaPods

To integrate CocoaMQTT into your Xcode project using CocoaPods, you need to modify you Podfile like the followings:

use_frameworks!

target 'Example' do
    pod 'CocoaMQTT'
end

Then, run the following command:

$ pod install

At last, import "CocoaMQTT" to your project:

import CocoaMQTT

Carthage

Install using Carthage by adding the following lines to your Cartfile:

github "emqx/CocoaMQTT" "master"

Then, run the following command:

$ carthage update --platform iOS,macOS,tvOS --use-xcframeworks

At last:

On your application targets “General” settings tab, in the "Frameworks, Libraries, and Embedded content" section, drag and drop CocoaMQTT.xcframework, CocoaAsyncSocket.xcframework and Starscream.xcframework from the Carthage/Build folder on disk. Then select "Embed & Sign".

Usage

Create a client to connect MQTT broker:

///MQTT 5.0
let clientID = "CocoaMQTT-" + String(ProcessInfo().processIdentifier)
let mqtt5 = CocoaMQTT5(clientID: clientID, host: "broker.emqx.io", port: 1883)

let connectProperties = MqttConnectProperties()
connectProperties.topicAliasMaximum = 0
connectProperties.sessionExpiryInterval = 0
connectProperties.receiveMaximum = 100
connectProperties.maximumPacketSize = 500
mqtt5.connectProperties = connectProperties

mqtt5.username = "test"
mqtt5.password = "public"
mqtt5.willMessage = CocoaMQTTMessage(topic: "/will", string: "dieout")
mqtt5.keepAlive = 60
mqtt5.delegate = self
mqtt5.connect()

///MQTT 3.1.1
let clientID = "CocoaMQTT-" + String(ProcessInfo().processIdentifier)
let mqtt = CocoaMQTT(clientID: clientID, host: "broker.emqx.io", port: 1883)
mqtt.username = "test"
mqtt.password = "public"
mqtt.willMessage = CocoaMQTTMessage(topic: "/will", string: "dieout")
mqtt.keepAlive = 60
mqtt.delegate = self
mqtt.connect()

Now you can use closures instead of CocoaMQTTDelegate:

mqtt.didReceiveMessage = { mqtt, message, id in
    print("Message received in topic \(message.topic) with payload \(message.string!)")           
}

SSL Secure

One-way certification

No certificate is required locally. If you want to trust all untrust CA certificates, you can do this:

mqtt.allowUntrustCACertificate = true

Two-way certification

Need a .p12 file which is generated by a public key file and a private key file. You can generate the p12 file in the terminal:

openssl pkcs12 -export -clcerts -in client-cert.pem -inkey client-key.pem -out client.p12

Note: Please use openssl version 1.1 (e.g. brew install openssl@1.1), otherwise you may not be able to import the generated .p12 file to the system correctly.

MQTT over Websocket

In the 1.3.0, The CocoaMQTT has supported to connect to MQTT Broker by Websocket.

If you integrated by CocoaPods, you need to modify you Podfile like the followings and execute pod install again:

use_frameworks!

target 'Example' do
    pod 'CocoaMQTT/WebSockets'
end

If you're using CocoaMQTT in a project with only a .podspec and no Podfile, e.g. in a module for React Native, add this line to your .podspec:

Pod::Spec.new do |s|
  ...
  s.dependency "Starscream"
end

Then, Create a MQTT instance over Websocket:

///MQTT 5.0
let websocket = CocoaMQTTWebSocket(uri: "/mqtt")
let mqtt5 = CocoaMQTT5(clientID: clientID, host: host, port: 8083, socket: websocket)
let connectProperties = MqttConnectProperties()
connectProperties.topicAliasMaximum = 0
// ...
mqtt5.connectProperties = connectProperties
// ...

_ = mqtt5.connect()

///MQTT 3.1.1
let websocket = CocoaMQTTWebSocket(uri: "/mqtt")
let mqtt = CocoaMQTT(clientID: clientID, host: host, port: 8083, socket: websocket)

// ...

_ = mqtt.connect()

If you want to add additional custom header to the connection, you can use the following:

let websocket = CocoaMQTTWebSocket(uri: "/mqtt")
websocket.headers = [
            "x-api-key": "value"
        ]
        websocket.enableSSL = true

let mqtt = CocoaMQTT(clientID: clientID, host: host, port: 8083, socket: websocket)

// ...

_ = mqtt.connect()

Example App

You can follow the Example App to learn how to use it. But we need to make the Example App works fisrt:

$ cd Examples

$ pod install

Then, open the Example.xcworkspace/ by Xcode and start it!

Dependencies

These third-party functions are used:

GCDAsyncSocket

• MqttCocoaAsyncSocket
• Starscream

LICENSE

MIT License (see LICENSE)

Contributors

• @andypiper
• @turtleDeng
• @jan-bednar
• @jmiltner
• @manucheri
• @Cyrus Ingraham

Author

• Feng Lee feng@emqx.io
• CrazyWisdom zh.whong@gmail.com
• Alex Yu alexyu.dc@gmail.com
• Leeway leeway1208@gmail.com

Twitter

https://twitter.com/EMQTech