基于IoT物联网技术的智能手持测温枪开发实践

// 引入依赖mqtt库，或自己实现
const mqtt = require('aliyun-iot-mqtt');
// 设备身份
var options = {
    productKey: "设备pk",
    deviceName: "设备dn",
    deviceSecret: "设备ds",
    regionId: "cn-shanghai"
};

// 1.建立连接
const client = mqtt.getAliyunIotMqttClient(options);

// 2.设备接收云端指令数据
client.on('message', function(topic, message) {
    console.log("topic " + topic)
    console.log("message " + message)
})

// 3. 模拟设备 上报数据（原始报文）
setInterval(function() {
    client.publish(`/${options.productKey}/${options.deviceName}/user/data`, getPostData(),{qos:1});

}, 1000);


// 模拟 设备原有报文格式
function getPostData() {
    let payload = {
      temperature:Math.floor((Math.random() * 20) + 10)
    };

    console.log("payload=[ " + payload+" ]")
    return JSON.stringify(payload);
}
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public class AMQPClient {

    private final static Logger logger = LoggerFactory.getLogger(AMQPClient.class);
    //消费组配置参数
    private static String accessKey = "阿里云账号ak";
    private static String accessSecret = "阿里云账号as";
    private static String consumerGroupId = "服务端订阅消费组ID";
    private static String aliUID = "替换你的阿里云账号UID";

    public static void main(String[] args) throws Exception {

        long timeStamp = System.currentTimeMillis();
        //签名方法
        String signMethod = "hmacsha1";
        //控制台服务端订阅中消费组状态页客户端ID一栏将显示clientId参数。
        //建议使用机器UUID、MAC地址、IP等唯一标识等作为clientId。便于您区分识别不同的客户端。
        String clientId = "ecs_"+System.currentTimeMillis();

        //UserName组装
        String userName = clientId + "|authMode=aksign"
                + ",signMethod=" + signMethod
                + ",timestamp=" + timeStamp
                + ",authId=" + accessKey
                + ",consumerGroupId=" + consumerGroupId
                + "|";
        //password组装
        String signContent = "authId=" + accessKey + "&timestamp=" + timeStamp;
        String password = doSign(signContent,accessSecret, signMethod);
        //按照qpid-jms的规范，组装连接URL。
        String connectionUrl = "failover:(amqps://"+aliUID+".iot-amqp.cn-shanghai.aliyuncs.com:5671?amqp.idleTimeout=80000)"
                + "?failover.reconnectDelay=30";

        Hashtable<String, String> hashtable = new Hashtable<>();
        hashtable.put("connectionfactory.SBCF",connectionUrl);
        hashtable.put("queue.QUEUE", "default");
        hashtable.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.qpid.jms.jndi.JmsInitialContextFactory");
        Context context = new InitialContext(hashtable);
        ConnectionFactory cf = (ConnectionFactory)context.lookup("SBCF");
        Destination queue = (Destination)context.lookup("QUEUE");
        // 创建和IoT平台的AMQP连接
        Connection connection = cf.createConnection(userName, password);
        ((JmsConnection) connection).addConnectionListener(myJmsConnectionListener);
        // 创建 Session
        // Session.CLIENT_ACKNOWLEDGE: 收到消息后，需要手动调用message.acknowledge()
        // Session.AUTO_ACKNOWLEDGE: SDK自动ACK（推荐）
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        connection.start();
        // 创建消费者
        MessageConsumer consumer = session.createConsumer(queue);
        consumer.setMessageListener(messageListener);
    }

    private static MessageListener messageListener = new MessageListener() {
        @Override
        public void onMessage(Message message) {
            try {
                byte[] body = message.getBody(byte[].class);
                String content = new String(body);
                String topic = message.getStringProperty("topic");
                String messageId = message.getStringProperty("messageId");
                logger.info("receive message"
                        + ", topic = " + topic
                        + ", messageId = " + messageId
                        + ", content = " + content);
                System.out.println();
                //如果创建Session选择的是Session.CLIENT_ACKNOWLEDGE，这里需要手动ACK。
                //message.acknowledge();
                //如果要对收到的消息做耗时的处理，请异步处理，确保这里不要有耗时逻辑。
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    };
    private static MessageListener messageListener = new MessageListener() {
    //回调
    };
    /**
     * password签名计算方法，请参见上一篇文档：AMQP客户端接入说明。
     */
    private static String doSign(String toSignString, String secret, String signMethod) throws Exception {
        SecretKeySpec signingKey = new SecretKeySpec(secret.getBytes(), signMethod);
        Mac mac = Mac.getInstance(signMethod);
        mac.init(signingKey);
        byte[] rawHmac = mac.doFinal(toSignString.getBytes());
        return Base64.encodeBase64String(rawHmac);
    }
}
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