https://github.com/emqx/cocoamqtt
MQTT 5.0 client library for iOS and macOS written in Swift
https://github.com/emqx/cocoamqtt
cocoamqtt cocoapods ios macos macosx mqtt mqtt-client swift tvos
Last synced: 6 days ago
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MQTT 5.0 client library for iOS and macOS written in Swift
- Host: GitHub
- URL: https://github.com/emqx/cocoamqtt
- Owner: emqx
- License: other
- Created: 2014-07-28T00:45:09.000Z (almost 12 years ago)
- Default Branch: master
- Last Pushed: 2026-06-26T07:47:10.000Z (10 days ago)
- Last Synced: 2026-06-26T09:04:38.611Z (10 days ago)
- Topics: cocoamqtt, cocoapods, ios, macos, macosx, mqtt, mqtt-client, swift, tvos
- Language: Swift
- Homepage: https://www.emqx.com/en
- Size: 1.85 MB
- Stars: 1,747
- Watchers: 75
- Forks: 473
- Open Issues: 142
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Agents: AGENTS.md
Awesome Lists containing this project
README
# 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:
```ruby
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
### Swift Package Manager
To integrate CocoaMQTT into your Xcode project using [Swift Package Manager](https://swift.org/package-manager/), follow these steps:
1. Open your project in Xcode.
2. Go to `File` > `Swift Packages` > `Add Package Dependency`.
3. Enter the repository URL: `https://github.com/emqx/CocoaMQTT.git`.
4. Choose the latest version or specify a version range.
5. Add the package to your target.
At last, import "CocoaMQTT" to your project:
```swift
import CocoaMQTT
```
### CocoaPods
To integrate CocoaMQTT into your Xcode project using [CocoaPods](http://cocoapods.org), you need to modify you `Podfile` like the followings:
```ruby
use_frameworks!
target 'Example' do
pod 'CocoaMQTT'
end
```
Then, run the following command:
```bash
$ pod install
```
At last, import "CocoaMQTT" to your project:
```swift
import CocoaMQTT
```
## Usage
Create a client to connect [MQTT broker](https://www.emqx.com/en/mqtt/public-mqtt5-broker):
```swift
///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`:
```swift
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:
```swift
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 **Swift Package Manager**, follow these steps:
1. Open your project in Xcode.
2. Go to `File` > `Swift Packages` > `Add Package Dependency`.
3. Enter the repository URL: `https://github.com/emqx/CocoaMQTT.git`.
4. Choose the latest version or specify a version range.
5. Add the package to your target.
At last, import "CocoaMQTT" and "Starscream" to your project:
```swift
import CocoaMQTT
import CocoaMQTTWebSocket
import Starscream
```
If you integrated by **CocoaPods**, you need to modify you `Podfile` like the followings and execute `pod install` again:
```ruby
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`:
```ruby
Pod::Spec.new do |s|
...
s.dependency "Starscream"
end
```
Then, Create a MQTT instance over Websocket:
```swift
///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:
```swift
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()
```
If you want to connect using WebSocket Secure (wss), you can use the following example:
```swift
import CocoaMQTT
import CocoaMQTTWebSocket
import Starscream
class WebSocketManager {
private var mqttClient: CocoaMQTT?
var message: String = ""
var token: String = ""
func setupMQTTClient(with token: String) {
let socket = CocoaMQTTWebSocket(uri: "/mqtt")
socket.enableSSL = true
mqttClient = CocoaMQTT(clientID: token, host: "host", port: 443, socket: socket)
mqttClient?.delegate = self
}
func connect() {
guard let mqttClient = mqttClient else { return }
mqttClient.connect()
}
}
extension WebSocketManager: CocoaMQTTDelegate {
func mqtt(_ mqtt: CocoaMQTT, didReceive trust: SecTrust, completionHandler: @escaping (Bool) -> Void) {
// Implement your custom SSL validation logic here.
// For example, you might want to always trust the certificate for testing purposes:
completionHandler(true)
}
func mqtt(_ mqtt: CocoaMQTT, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
if challenge.protectionSpace.authenticationMethod == NSURLAuthenticationMethodServerTrust {
if let serverTrust = challenge.protectionSpace.serverTrust {
completionHandler(.useCredential, URLCredential(trust: serverTrust))
return
}
}
completionHandler(.performDefaultHandling, nil)
}
func mqttUrlSession(_ mqtt: CocoaMQTT, didReceiveTrust trust: SecTrust, didReceiveChallenge challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
print("\(#function), \n result:- \(challenge.debugDescription)")
}
func mqtt(_ mqtt: CocoaMQTT, didPublishAck id: UInt16) {
print("Published message with ID: \(id)")
}
func mqtt(_ mqtt: CocoaMQTT, didUnsubscribeTopics topics: [String]) {
print("Unsubscribed from topics: \(topics)")
}
func mqttDidPing(_ mqtt: CocoaMQTT) {
print("MQTT did ping")
}
func mqttDidReceivePong(_ mqtt: CocoaMQTT) {
print("MQTT did receive pong")
}
func mqttDidDisconnect(_ mqtt: CocoaMQTT, withError err: (any Error)?) {
print("Disconnected from MQTT broker with error: \(String(describing: err))")
}
func mqtt(_ mqtt: CocoaMQTT, didConnectAck ack: CocoaMQTTConnAck) {
print("Connected to MQTT broker with acknowledgment: \(ack)")
}
func mqtt(_ mqtt: CocoaMQTT, didReceiveMessage message: CocoaMQTTMessage, id: UInt16) {
if let messageString = message.string {
DispatchQueue.main.async {
self.message = messageString
}
print("Received message: \(messageString) on topic: \(message.topic)")
}
}
func mqtt(_ mqtt: CocoaMQTT, didPublishMessage message: CocoaMQTTMessage, id: UInt16) {
print("Published message: \(message.string ?? "") with ID: \(id)")
}
func mqtt(_ mqtt: CocoaMQTT, didSubscribeTopics success: NSDictionary, failed: [String]) {
print("Subscribed to topics: \(success), failed to subscribe to: \(failed)")
}
func mqtt(_ mqtt: CocoaMQTT, didDisconnectWithError err: Error?) {
print("Disconnected from MQTT broker with error: \(String(describing: err))")
}
}
```
## Example App
You can follow the Example App to learn how to use it. But we need to make the Example App works first:
```bash
$ cd Examples
```
Then, open the `Example.xcodeproj` by Xcode and start it!
## Dependencies
These third-party functions are used:
~~[GCDAsyncSocket](https://github.com/robbiehanson/CocoaAsyncSocket)~~
* [MqttCocoaAsyncSocket](https://github.com/leeway1208/MqttCocoaAsyncSocket)
* [Starscream](https://github.com/daltoniam/Starscream)
## LICENSE
MIT License (see `LICENSE`)
## Contributors
* [@andypiper](https://github.com/andypiper)
* [@turtleDeng](https://github.com/turtleDeng)
* [@jan-bednar](https://github.com/jan-bednar)
* [@jmiltner](https://github.com/jmiltner)
* [@manucheri](https://github.com/manucheri)
* [@Cyrus Ingraham](https://github.com/cyrusingraham)
## Author
- Feng Lee
- CrazyWisdom
- Alex Yu
- Leeway
## Twitter
https://twitter.com/EMQTech