SODAQ通用追踪器 / 使用UDP集成上传遥测

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 /** 解码器 **/

 // 输入JSON的字段
 var reports = decodeToJson(payload).reports;

 // 结果对象含设备属性/遥测数据
 var result = {
 deviceName: {},
 deviceType:"tracker",
 telemetry: []
 };

 for (var i = 0; i < reports.length; i++) {
 result.deviceName = parseInt(reports[i].value.substring(2, 16), 16);
 var telemetryObj = {
 ts: {},
 values: {}
 };
 timestamp = stringToInt(reports[i].value.substring(32,40))*1000;
 v = stringToInt(reports[i].value.substring(40,42))/100 + 3;
 t = stringToInt(reports[i].value.substring(42,44));
 lat = stringToInt(reports[i].value.substring(44,52))/10000000;
 lon = stringToInt(reports[i].value.substring(52,60))/10000000;
 alt = stringToInt(reports[i].value.substring(60, 64));
 speed = stringToInt(reports[i].value.substring(64, 68));
 sat = stringToInt(reports[i].value.substring(68, 70));
 ttf = stringToInt(reports[i].value.substring(70, 72));

 telemetryObj.ts = timestamp;
 telemetryObj.values.batteryVoltage = v;
 telemetryObj.values.temperature = t;
 if(lat !== 0) {
 telemetryObj.values.latitude = lat;
 }
 if(lon !== 0) {
 telemetryObj.values.longitude = lon;
 }
 if(alt !== 0) {
 telemetryObj.values.altitude = alt;
 }
 telemetryObj.values.speed = speed;
 telemetryObj.values.satellitesObserved = sat;
 telemetryObj.values.timetToFirstFix = ttf;
 result.telemetry.push(telemetryObj);
 }

 /** 辅助函数 **/

 function stringToInt(hex) {
 return parseInt('0x' + hex.match(/../g).reverse().join(''));
 }

 function decodeToString(payload) {
 return String.fromCharCode.apply(String, payload);
 }

 function decodeToJson(payload) {
 // 将payload转换为字符串
 var str = decodeToString(payload);

 // 将字符串解析为JSON
 var data = JSON.parse(str);
 return data;
 }

 return result;