iOS MQTT 簡單使用流程

阿狸先森丶12138發表於2019-03-04

簡稱為EMQ – 百萬級開源MQTT訊息伺服器

EMQ (Erlang/Enterprise/Elastic MQTT Broker) 是基於 Erlang/OTP 平臺開發的開源物聯網 MQTT 訊息伺服器。Erlang/OTP 是出色的軟實時(Soft-Realtime)、低延時(Low-Latency)、分散式(Distributed) 的語言平臺。MQTT 是輕量的(Lightweight)、釋出訂閱模式(PubSub) 的物聯網訊息協議。

EMQ 專案設計目標是承載移動終端或物聯網終端海量 MQTT 連線,並實現在海量物聯網裝置間快速低延時訊息路由:

  1. 穩定承載大規模的 MQTT 客戶端連線,單伺服器節點支援50萬到100萬連線。
  2. 分散式節點叢集,快速低延時的訊息路由,單叢集支援1000萬規模的路由。
  3. 訊息伺服器內擴充套件,支援定製多種認證方式、高效儲存訊息到後端資料庫。
  4. 完整物聯網協議支援,MQTT、MQTT-SN、CoAP、WebSocket 或私有協議支援。

選擇 MQTT SDK 分為多種

以下介紹其中的兩種 MQTTKitMQTT-Client-Framework 這兩種都是OC 使用
Swift 版本可參考 CocoaMQTT1、 ** MQTTKit **已經不更新 但是基本使用沒問題

pod `MQTTKit`

標頭檔案

#import <MQTTKit.h>
#define WEAKSELF __typeof(&*self) __weak weakSelf = self;
@property (nonatomic, strong) MQTTClient *client;

初始化 連結

	WEAKSELF
    NSString *clientID = @"測試client - 必須是全域性唯一的id ";
    MQTTClient *client = [[MQTTClient alloc] initWithClientId:StrFormat(@"%@", clientID)];
    client.username = @"username";
    client.password = @"password";
    client.cleanSession = false;
    client.keepAlive = 20;
    client.port = 11883;// 埠號 根據服務端 選擇
    self.client = client;
    // 連結MQTT
    [client connectToHost:@"連結的MQTT的URL" completionHandler:^(MQTTConnectionReturnCode code) {
        if (code == ConnectionAccepted) {
            NSLog(@"連結MQTT 成功 ???");
            // 連結成功  訂閱相對應的主題
        [weakSelf.client subscribe:@"你需要訂閱的主題" withQos:AtLeastOnce completionHandler:^(NSArray *grantedQos) {
            DLog(@"訂閱 返回 %@",grantedQos);
        }];
        }else if (code == ConnectionRefusedBadUserNameOrPassword){
            NSLog(@"MQTT 賬號或驗證碼錯誤");
        } else if (code == ConnectionRefusedUnacceptableProtocolVersion){
            NSLog(@"MQTT 不可接受的協議");
        }else if (code == ConnectionRefusedIdentiferRejected){
            NSLog(@"MQTT不認可");
        }else if (code == ConnectionRefusedServerUnavailable){
            NSLog(@"MQTT拒絕連結");
        }else {
            NSLog(@"MQTT 未授權");
        }
    }];
 // 接收訊息體
    client.messageHandler = ^(MQTTMessage *message) {
        NSString *jsonStr = [[NSString alloc] initWithData:message.payload encoding:NSUTF8StringEncoding];
        NSLog(@"EasyMqttService mqtt connect success  %@",jsonStr);
    };
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訂閱主題

// 方法 封裝 可外部呼叫
-(void)subscribeType:(NSString *)example{
    // 訂閱主題
    [self.client subscribe:@"你需要訂閱的主題" withQos:AtMostOnce completionHandler:^(NSArray *grantedQos) {
        NSLog(@"訂閱 返回 %@",grantedQos);
    }];
}
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關閉MQTTKit

-(void)closeMQTTClient{
    WEAKSELF
    [self.client disconnectWithCompletionHandler:^(NSUInteger code) {
        // The client is disconnected when this completion handler is called
        NSLog(@"MQTT client is disconnected");
        [weakSelf.client unsubscribe:@"已經訂閱的主題" withCompletionHandler:^{
            NSLog(@"取消訂閱");
        }];
    }];
}
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傳送訊息

   [self.client publishString:postMsg toTopic:@"傳送訊息的主題 根據服務端定"  withQos:AtLeastOnce retain:NO completionHandler:^(int mid) {
        if (cmd != METHOD_SOCKET_CHAT_TO) {
            NSLog(@"傳送訊息 返回 %d",mid);
        }
    }];
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2、 ** MQTTClient ** MQTTClient 配置更多 是可持續更新,可配置 SSL

基本使用
pod `MQTTClient`
websocket 方式連線
pod `MQTTClient/MinL`
pod `MQTTClient/ManagerL`
pod `MQTTClient/WebsocketL`

標頭檔案

基本使用
#import <MQTTClient.h>
websocket 需要新增的標頭檔案
#import <MQTTWebsocketTransport.h>
#define WEAKSELF __typeof(&*self) __weak weakSelf = self;
@property (nonatomic, strong) MQTTSession *mySession;
需要新增協議頭
<MQTTSessionDelegate,MQTTSessionManagerDelegate>

初始化 連結

基本使用


#import "MQTTClient.h"
@interface MyDelegate : ... <MQTTSessionDelegate>
...
        MQTTCFSocketTransport *transport = [[MQTTCFSocketTransport alloc] init];
        transport.host = @"localhost";
        transport.port = 1883;
        MQTTSession *session = [[MQTTSession alloc] init];
        session.transport = transport;
    	session.delegate = self;
    	[session connectAndWaitTimeout:30];  //this is part of the synchronous API
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websocket 連線

	WEAKSELF
    NSString *clientID = @"測試client - 必須是全域性唯一的id ";
    MQTTWebsocketTransport *transport = [[MQTTWebsocketTransport alloc] init];
    transport.host = @"連線MQTT 地址";
    transport.port =  8083;  // 埠號
    transport.tls = YES; //  根據需要配置  YES 開起 SSL 驗證 此處為單向驗證 雙向驗證 根據SDK 提供方法直接新增
    MQTTSession *session = [[MQTTSession alloc] init];
    NSString *linkUserName = @"username";
    NSString *linkPassWord = @"password";
    [session setUserName:linkUserName];
    [session setClientId:clientID];
    [session setPassword:linkPassWord];
    [session setKeepAliveInterval:5];
    session.transport = transport;
    session.delegate = self;
    self.mySession = session;
    [self reconnect];
    [self.mySession addObserver:self forKeyPath:@"state" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:nil]; //新增事件監聽
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websocket 監聽 響應事件

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    switch (self.mySession.status) {
        case MQTTSessionManagerStateClosed:
        NSLog(@"連線已經關閉");
        break;
        case MQTTSessionManagerStateClosing:
        NSLog(@"連線正在關閉");
        break;
        case MQTTSessionManagerStateConnected:
        NSLog(@"已經連線");
        break;
        case MQTTSessionManagerStateConnecting:
        NSLog(@"正在連線中");
        
        break;
        case MQTTSessionManagerStateError: {
            //            NSString *errorCode = self.mySession.lastErrorCode.localizedDescription;
            NSString *errorCode = self.mySession.description;
            NSLog(@"連線異常 ----- %@",errorCode);
        }
        break;
        case MQTTSessionManagerStateStarting:
        NSLog(@"開始連線");
        break;
        default:
        break;
    }
}
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session Delegate 協議

連線 返回狀態

-(void)handleEvent:(MQTTSession *)session event:(MQTTSessionEvent)eventCode error:(NSError *)error{
    if (eventCode == MQTTSessionEventConnected) {
        NSLog(@"2222222 連結MQTT 成功");
    }else if (eventCode == MQTTSessionEventConnectionRefused) {
            NSLog(@"MQTT拒絕連結");
   }else if (eventCode == MQTTSessionEventConnectionClosed){
            NSLog(@"MQTT連結關閉");
  }else if (eventCode == MQTTSessionEventConnectionError){
            NSLog(@"MQTT 連結錯誤");
  }else if (eventCode == MQTTSessionEventProtocolError){
            NSLog(@"MQTT 不可接受的協議");
  }else{//MQTTSessionEventConnectionClosedByBroker
            NSLog(@"MQTT連結 其他錯誤");
  }
   if (error) {
        NSLog(@"連結報錯  -- %@",error);
   }
}
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收到傳送的訊息

-(void)newMessage:(MQTTSession *)session data:(NSData *)data onTopic:(NSString *)topic qos:(MQTTQosLevel)qos retained:(BOOL)retained mid:(unsigned int)mid
{
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
    NSLog(@"EasyMqttService mqtt connect success  %@",dic);
    // 做相對應的操作
}
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訂閱主題

基本使用

// 方法 封裝 可外部呼叫
[session subscribeToTopic:@"example/#" atLevel:2 subscribeHandler:^(NSError *error, NSArray<NSNumber *> *gQoss){
    if (error) {
        NSLog(@"Subscription failed %@", error.localizedDescription);
    } else {
        NSLog(@"Subscription sucessfull! Granted Qos: %@", gQoss);
    }
 }]; // this is part of the block API
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websocket

- (void)subscibeToTopicAction {
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        dispatch_async(dispatch_get_main_queue(), ^{
            [self subscibeToTopic:@"你要訂閱的主題"];
            
        });
    });
}

-(void)subscibeToTopic:(NSString *)topicUrl
{
//    self.manager.subscriptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:MQTTQosLevelAtMostOnce] forKey:topicUrl];
    [self.mySession subscribeToTopic:topicUrl atLevel:MQTTQosLevelAtMostOnce subscribeHandler:^(NSError *error, NSArray<NSNumber *> *gQoss) {
        if (error) {
            NSLog(@"訂閱 %@ 失敗 原因 %@",topicUrl,error);
        }else
        {
            NSLog(@"訂閱 %@ 成功 g1oss %@",topicUrl,gQoss);
            dispatch_async(dispatch_get_main_queue(), ^{
                // 操作
            });

        };
    }];
}
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關閉MQTT-Client

-(void)closeMQTTClient{
    [self.mySession disconnect];
    [self.mySession unsubscribeTopics:@[@"已經訂閱的主題"] unsubscribeHandler:^(NSError *error) {
        if (error) {
            DLog(@"取消訂閱失敗");
        }else{
            DLog(@"取消訂閱成功");
        }
    }];
}
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傳送訊息

    [self.mySession publishData:jsonData onTopic:@"傳送訊息的主題 服務端定義" retain:NO qos:MQTTQosLevelAtMostOnce publishHandler:^(NSError *error) {
        if (error) {
            NSLog(@"傳送失敗 - %@",error);
        }else{
            NSLog(@"傳送成功");
        }
    }];
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