博客

最近在看mqtt的一些资料。结合项目也研究了一下。翻阅博客，大家对于ios开发mqtt到连接这一步就停止了。

关于cocoaMQTT的基础部分。

import UIKit
import CocoaMQTT


class ViewController: UIViewController {
    var mqtt:CocoaMQTT?{
        
        didSet{
            
            
            if mqtt?.connState == CocoaMQTTConnState.connected {
                
                
                //mqtt?.publish("chat", withString: "dtr")
            }
            
            
        }
        
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.mqtt?.publish("chat", withString: "我好开心啊", qos: CocoaMQTTQOS.qos0, retained: false, dup: false)
    }
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        
        
        let clientID = "CocoaMQTT1-" + String(ProcessInfo().processIdentifier)
        mqtt = CocoaMQTT(clientID: clientID, host: "127.0.0.1", port: 1883)
        mqtt?.username = "thinkpad"
        mqtt?.password = "public"
//        mqtt?.willMessage = CocoaMQTTWill(topic: "/will", message: "dieout")
        
//        mqtt?.publish("chat", withString: "dtet", qos: CocoaMQTTQOS.qos0, retained: true, dup: true)
        mqtt?.keepAlive = 60
        mqtt?.delegate = self
        mqtt?.subscribe("chat")
        mqtt?.connect()
        
        
    }


}

extension ViewController:CocoaMQTTDelegate{
    func mqttDidPing(_ mqtt: CocoaMQTT) {
        
    }
    
    func mqttDidReceivePong(_ mqtt: CocoaMQTT) {
        
    }
    
    func mqttDidDisconnect(_ mqtt: CocoaMQTT, withError err: Error?) {
        
    }
    
    func mqtt(_ mqtt: CocoaMQTT, didConnectAck ack: CocoaMQTTConnAck) {
        
        //注意一定要连接成功了之后，才能发布主题和订阅主题。
        if ack.description == "accept" {
            mqtt.publish("chat", withString: "dtr")
            mqtt.subscribe("chht")
        }
        
      
    }
    
    func mqtt(_ mqtt: CocoaMQTT, didPublishMessage message: CocoaMQTTMessage, id: UInt16) {
        
        print(message.string ?? "999")
        
    }
    
    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, didUnsubscribeTopic topic: String) {
        
    }
    
}

其实在写这些代码的时候，我发现了。订阅主题，发布主题，必须要等到连接成功之后才能进行。当然这篇博客还是会继续的写下去的。真正的项目开发，不只有这样，包括多线程的处理消息的接收。连接设备.订阅多个主题。SSL连接。等等。