如何解析LoRaWAN设备数据及开源MQTT SDK设备端模拟

这期内容当中小编将会给大家带来有关如何解析LoRaWAN设备数据及开源MQTT SDK设备端模拟，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

概述

LoRaWAN设备与物联网平台的通信数据格式为透传/自定义，因此需要使用数据解析脚本，解析上下行数据。本文主要以阿里云官方文档LoRaWAN设备数据解析为基础，基于开源MQTT SDK，实现完整的: 设备<->云端消息链路测试。

操作步骤

前期准备

1、创建产品，因为这边没有入网凭证，使用WiFi联网方式，数据格式：透传/自定义:
cdn.com/597e368e382cffc50012a9ecfd3e0a0db2deb00c.png">

2、添加物模型，可以直接参考官方文档说明逐个添加，这里提供对应物模型的完整文本，可以copy内容到本地自己创建的：model.json文件，然后物联网平台管理控制台直接导入:

{    "schema":"https://iotx-tsl.oss-ap-southeast-1.aliyuncs.com/schema.json",    "profile":{        "productKey":"********">

3、添加脚本并测试，脚本使用官方附录：示例脚本即可，测试正常后注意点击提交。

虚拟设备调试

5、在线发送

7、二进制数据Base64编码(对应截图中使用的AAEC的计算方法)

import sun.misc.BASE64Encoder;import java.io.IOException;public class ByteToBase64 {    public static void main(String[] args) throws IOException {        String data = "000102"; // 待转换的十六进制数据对应的字符串        byte[] bytes = hexToByteArray(data);        String base64Str = getBase64String(bytes);        System.out.println("base64Str: ">

设备端开源MQTT SDK接入

8、设备端代码

import com.alibaba.taro.AliyunIoTSignUtil;import org.eclipse.paho.client.mqttv3.*;import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;import sun.misc.BASE64Encoder;import java.io.IOException;import java.util.HashMap;import java.util.Map;// 透传类设备测试public class IoTDemoPubSubDemo {    public static String productKey = "********";    public static String deviceName = "device2";    public static String deviceSecret = "*********";    public static String regionId = "cn-shanghai";    // 物模型-属性上报topic    private static String pubTopic = "/sys/" + productKey + "/" + deviceName + "/thing/model/up_raw";    // 物模型-订阅属性Topic    private static String subTopic = "/sys/" + productKey + "/" + deviceName + "/thing/model/down_raw";    private static MqttClient mqttClient;    public static void main(String [] args){        initAliyunIoTClient(); // 初始化Client//        ScheduledExecutorService scheduledThreadPool = new ScheduledThreadPoolExecutor(1,//                new ThreadFactoryBuilder().setNameFormat("thread-runner-%d").build());////        scheduledThreadPool.scheduleAtFixedRate(()->postDeviceProperties(), 10,10, TimeUnit.SECONDS);        // 汇报属性        postDeviceProperties();        try {            mqttClient.subscribe(subTopic); // 订阅Topic        } catch (MqttException e) {            System.out.println("error:" + e.getMessage());            e.printStackTrace();        }        // 设置订阅监听        mqttClient.setCallback(new MqttCallback() {            @Override            public void connectionLost(Throwable throwable) {                System.out.println("connection Lost");            }            @Override            public void messageArrived(String s, MqttMessage mqttMessage) throws Exception {                System.out.println("Sub message");                System.out.println("Topic : " + s);                System.out.println("16进制形式输出：");                System.out.println(bytes2hex(mqttMessage.getPayload()));                System.out.println("10进制形式输出：");                byte[] bytes = mqttMessage.getPayload();                for (byte t:bytes)                {                    System.out.print(t + " ");                }             }            @Override            public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {            }        });    }    /**     * 初始化 Client 对象     */    private static void initAliyunIoTClient() {        try {            // 构造连接需要的参数            String clientId = "java" + System.currentTimeMillis();            Map params = new HashMap<>(16);            params.put("productKey", productKey);            params.put("deviceName", deviceName);            params.put("clientId", clientId);            String timestamp = String.valueOf(System.currentTimeMillis());            params.put("timestamp", timestamp);            // cn-shanghai            String targetServer = "tcp://" + productKey + ".iot-as-mqtt."+regionId+".aliyuncs.com:1883";            String mqttclientId = clientId + "|securemode=3,signmethod=hmacsha1,timestamp=" + timestamp + "|";            String mqttUsername = deviceName + "&" + productKey;            String mqttPassword = AliyunIoTSignUtil.sign(params, deviceSecret, "hmacsha1");            connectMqtt(targetServer, mqttclientId, mqttUsername, mqttPassword);        } catch (Exception e) {            System.out.println("initAliyunIoTClient error " + e.getMessage());        }    }    public static void connectMqtt(String url, String clientId, String mqttUsername, String mqttPassword) throws Exception {        MemoryPersistence persistence = new MemoryPersistence();        mqttClient = new MqttClient(url, clientId, persistence);        MqttConnectOptions connOpts = new MqttConnectOptions();        // MQTT 3.1.1        connOpts.setMqttVersion(4);        connOpts.setAutomaticReconnect(false);        connOpts.setCleanSession(true);        connOpts.setUserName(mqttUsername);        connOpts.setPassword(mqttPassword.toCharArray());        connOpts.setKeepAliveInterval(60);        mqttClient.connect(connOpts);    }    /**     * 汇报属性     */    private static void postDeviceProperties() {        try {            //上报数据            //高级版 物模型-属性上报payload            System.out.println("上报属性值");            String hexString = "000111";            byte[] payLoad = hexToByteArray(hexString);            MqttMessage message = new MqttMessage(payLoad);            message.setQos(0);            mqttClient.publish(pubTopic, message);        } catch (Exception e) {            System.out.println(e.getMessage());        }    }    // 十进制byte[] 转16进制 String    public static String bytes2hex(byte[] bytes) {        StringBuilder sb = new StringBuilder();        String tmp = null;        for (byte b : bytes) {            // 将每个字节与0xFF进行与运算，然后转化为10进制，然后借助于Integer再转化为16进制            tmp = Integer.toHexString(0xFF & b);            if (tmp.length() == 1) {                tmp = "0" + tmp;            }            sb.append(tmp);        }        return sb.toString();    }    /**     * hex字符串转byte数组     * @param inHex 待转换的Hex字符串     * @return  转换后的byte数组结果     */    public static byte[] hexToByteArray(String inHex){        int hexlen = inHex.length();        byte[] result;        if (hexlen % 2 == 1){            //奇数            hexlen++;            result = new byte[(hexlen/2)];            inHex="0"+inHex;        }else {            //偶数            result = new byte[(hexlen/2)];        }        int j=0;        for (int i = 0; i < hexlen; i+=2){            result[j]=hexToByte(inHex.substring(i,i+2));            j++;        }        return result;    }    /**     * Hex字符串转byte     * @param inHex 待转换的Hex字符串     * @return  转换后的byte     */    public static byte hexToByte(String inHex) {        return (byte) Integer.parseInt(inHex, 16);    }}

9、设备运行状态

10、在线调试服务调用

{        "MaxTemp": 50,        "MinTemp": 8,        "MaxHumi": 90,        "MinHumi": 10}

11、设备端下行消息监听

上报属性值Sub messageTopic : /sys/********/device2/thing/model/down_raw16进制形式输出：5d0a000332085a0a10进制形式输出：93 10 0 3 50 8 90 10

12、数据脚本解析

上述就是小编为大家分享的如何解析LoRaWAN设备数据及开源MQTT SDK设备端模拟了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注行业资讯频道。