iOS MQTTClient使用记录

MQTT是IBM开发的一个即时通讯协议，有可能成为物联网的重要组成部分。该协议支持所有平台，几乎可以把所有联网物品和外部连接起来，被用来当做传感器和致动器（比如通过Twitter让房屋联网）的通信协议

MQTTClient Cocoapods安装

pod 'MQTTClient'

1.连接

self.manager = [[MQTTSessionManager alloc]init];
    self.manager.delegate = self;
    [self.manager connectTo:@"地址" port:@"端口号" tls:NO keepalive:60 clean:YES auth:YES user:nil pass:nil will:NO willTopic:nil willMsg:nil willQos:(MQTTQosLevelAtMostOnce) willRetainFlag:NO withClientId:nil securityPolicy:nil certificates:nil protocolLevel:(MQTTProtocolVersion311) connectHandler:^(NSError *error) {
        if (error == nil) {
            NSLog(@"MQTT连接成功");
        }
    }];
    //观察连接状态
    [self.manager addObserver:self forKeyPath:@"state" options:(NSKeyValueObservingOptionNew) context:nil];

2.连接状态

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{
    switch (self.manager.state) {
        case MQTTSessionManagerStateClosed:
            NSLog(@"MQTT&&&&&&&&&&&&&&closed");
            break;
        case MQTTSessionManagerStateClosing:
            NSLog(@"MQTT&&&&&&&&&&&&&&closing");
            break;
        case MQTTSessionManagerStateConnected:
            NSLog(@"MQTT&&&&&&&&&&&&&&connected");
            break;
        case MQTTSessionManagerStateConnecting:
            NSLog(@"MQTT&&&&&&&&&&&&&&connecting");
            break;
        case MQTTSessionManagerStateError:
            NSLog(@"MQTT&&&&&&&&&&&&&&error");
            break;
        case MQTTSessionManagerStateStarting:
            NSLog(@"MQTT&&&&&&&&&&&&&&starting");
            break;
            
        default:
            break;
    }

3.订阅channel

self.manager.subscriptions = @{@"指定的channel":[NSNumber numberWithInt:MQTTQosLevelAtMostOnce]};

4.发送消息

[self.manager sendData:data topic:@"指定的channel" qos:(MQTTQosLevelAtMostOnce) retain:NO];

5.收到MQTT消息

- (void)handleMessage:(NSData *)data onTopic:(NSString *)topic retained:(BOOL)retained{
}

具体使用可以查看GitHurb说明MQTT-Client-Framework.