LoRaWAN设备数据解析及开源MQTT SDK设备端模拟-阿里云开发者社区

开发者社区> Java技术进阶> 正文
登录阅读全文

LoRaWAN设备数据解析及开源MQTT SDK设备端模拟

简介: oRaWAN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。

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:
_

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":"********" // 注意为您自己产品的productkey
    },
    "services":[
        {
            "outputData":[
                
            ],
            "identifier":"set",
            "inputData":[
                {
                    "identifier":"Temperature",
                    "dataType":{
                        "specs":{
                            "min":"-40",
                            "max":"55",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"Temperature"
                },
                {
                    "identifier":"Humidity",
                    "dataType":{
                        "specs":{
                            "min":"1",
                            "max":"100",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"Humidity"
                }
            ],
            "method":"thing.service.property.set",
            "name":"set",
            "required":true,
            "callType":"async",
            "desc":"属性设置"
        },
        {
            "outputData":[
                {
                    "identifier":"Temperature",
                    "dataType":{
                        "specs":{
                            "min":"-40",
                            "max":"55",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"Temperature"
                },
                {
                    "identifier":"Humidity",
                    "dataType":{
                        "specs":{
                            "min":"1",
                            "max":"100",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"Humidity"
                }
            ],
            "identifier":"get",
            "inputData":[
                "Temperature",
                "Humidity"
            ],
            "method":"thing.service.property.get",
            "name":"get",
            "required":true,
            "callType":"async",
            "desc":"属性获取"
        },
        {
            "outputData":[
                
            ],
            "identifier":"SetTempHumiThreshold",
            "inputData":[
                {
                    "identifier":"MaxTemp",
                    "dataType":{
                        "specs":{
                            "min":"-100",
                            "max":"100",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"MaxTemp"
                },
                {
                    "identifier":"MinTemp",
                    "dataType":{
                        "specs":{
                            "min":"-100",
                            "max":"100",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"MinTemp"
                },
                {
                    "identifier":"MaxHumi",
                    "dataType":{
                        "specs":{
                            "min":"-100",
                            "max":"100",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"MaxHumi"
                },
                {
                    "identifier":"MinHumi",
                    "dataType":{
                        "specs":{
                            "min":"-100",
                            "max":"100",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"MinHumi"
                }
            ],
            "method":"thing.service.SetTempHumiThreshold",
            "name":"SetTempHumiThreshold",
            "required":false,
            "callType":"async"
        }
    ],
    "properties":[
        {
            "identifier":"Temperature",
            "dataType":{
                "specs":{
                    "min":"-40",
                    "max":"55",
                    "step":"1"
                },
                "type":"int"
            },
            "name":"Temperature",
            "accessMode":"rw",
            "required":false
        },
        {
            "identifier":"Humidity",
            "dataType":{
                "specs":{
                    "min":"1",
                    "max":"100",
                    "step":"1"
                },
                "type":"int"
            },
            "name":"Humidity",
            "accessMode":"rw",
            "required":false
        }
    ],
    "events":[
        {
            "outputData":[
                {
                    "identifier":"Temperature",
                    "dataType":{
                        "specs":{
                            "min":"-40",
                            "max":"55",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"Temperature"
                },
                {
                    "identifier":"Humidity",
                    "dataType":{
                        "specs":{
                            "min":"1",
                            "max":"100",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"Humidity"
                }
            ],
            "identifier":"post",
            "method":"thing.event.property.post",
            "name":"post",
            "type":"info",
            "required":true,
            "desc":"属性上报"
        },
        {
            "outputData":[
                {
                    "identifier":"Temperature",
                    "dataType":{
                        "specs":{
                            "min":"-100",
                            "max":"100",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"温度"
                }
            ],
            "identifier":"TempError",
            "method":"thing.event.TempError.post",
            "name":"TempError",
            "type":"alert",
            "required":false
        },
        {
            "outputData":[
                {
                    "identifier":"Humidity",
                    "dataType":{
                        "specs":{
                            "min":"-100",
                            "max":"100",
                            "step":"1"
                        },
                        "type":"int"
                    },
                    "name":"湿度"
                }
            ],
            "identifier":"HumiError",
            "method":"thing.event.HumiError.post",
            "name":"HumiError",
            "type":"alert",
            "required":false
        }
    ]
}

_

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。
_

4、产品下面添加设备
_

虚拟设备调试

5、在线发送
_
6、设备运行状态
_

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: " + base64Str);
    }

    /**
     *  二进制转base64 String
     * @param data 传入byte[]
     * @return String
     * @throws IOException
     */
    public static String getBase64String(byte[] data) throws IOException {
        BASE64Encoder encoder = new BASE64Encoder();
        return data != null ? encoder.encode(data) : "";
    }

    /*** 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);
    }
}

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<String, String> 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 message
Topic : /sys/********/device2/thing/model/down_raw
16进制形式输出:
5d0a000332085a0a
10进制形式输出:
93 10 0 3 50 8 90 10 

12、数据脚本解析

_

参考链接

基于开源JAVA MQTT Client连接阿里云IoT
LoRaWAN设备数据解析

版权声明:本文内容由阿里云实名注册用户自发贡献,版权归原作者所有,阿里云开发者社区不拥有其著作权,亦不承担相应法律责任。具体规则请查看《阿里云开发者社区用户服务协议》和《阿里云开发者社区知识产权保护指引》。如果您发现本社区中有涉嫌抄袭的内容,填写侵权投诉表单进行举报,一经查实,本社区将立刻删除涉嫌侵权内容。

分享: