使用node.js代码对物联网空气开关进行远程监控

使用node.js获取继电器信息

function unpack(format, data) {
  //仿 PHP 的 unpack() 函数：从二进制字符串对数据进行解包。
  const ret = [];
  var offset = 0;
  const fs = format.split('');
  try {
    for (var i = 0; i < fs.length; i++) {
      const sign = fs[i];
      if (0) {
      } else if (sign === 'c') {
        ret.push(data.readInt8(offset));
        offset += 1;
      } else if (sign === 'C') {
        ret.push(data.readUInt8(offset));
        offset += 1;
      } else if (sign === 'n') {
        ret.push(data.readInt16BE(offset));
        offset += 2;
      } else if (sign === 'l') {
        ret.push(data.readInt32BE(offset));
        offset += 4;
      } else if (sign === 'N') {
        ret.push(data.readUInt32BE(offset));
        offset += 4;
      } else {
      }
    }
  } catch (e) {
    return ret;
  }
  return ret;
}
function getReg3ByMsg(message) {
  // 对单相空气开关的3区数据进行解析
  const aReg3 = unpack('CCCnnnnnllnNNnnnnNnnnnnnnnnnnnnN', message);
  function getReg(pos, fix) {
    if (pos > aReg3.length - 1) {
      return;
    }
    var s = aReg3[pos];
    if (fix < 0) {
      s = s.toString();
      s = s.substr(0, s.length + fix) + '.' + s.substr(fix);
    }
    return parseFloat(s);
  }
  const mOut = {};
  mOut['零线温度'] = getReg(3, -1);
  mOut['火线温度'] = getReg(4, -1);
  mOut['芯片温度'] = getReg(5, -1);
  mOut['电压'] = getReg(6, -1);
  mOut['电流'] = getReg(7, -2);
  mOut['有功功率'] = getReg(8, -1);
  mOut['无功功率'] = getReg(9, -1);
  mOut['测量频率'] = getReg(10, -1);
  mOut['有功电度量'] = getReg(11, -2);
  mOut['无功电度量'] = getReg(12, -2);
  mOut['功率因数'] = getReg(13, 0);
  mOut['开关状态'] = getReg(14, 0);
  mOut['视在功率'] = getReg(17, 0);
  mOut['开关状态'] = getReg(14, 0);//21为开启，26为关闭
  mOut['漏电流'] = getReg(21, 0);
  mOut['挂锁状态'] = getReg(22, 0);
  mOut['分合闸日志'] = getReg(30, 0);
  mOut['时间戳'] = getReg(31, 0);
  console.log('断路器最新状态=>', mOut);
}
function TM(url, TMSN) {
  /*
  * 连接mqtt服务器并获取最新数据
  * url是服务器地址和用户名密码,例如mqtt://user:pass@host:port
  * TMSN是断路器的序列号
  */
  const mqtt = require('mqtt');
  const mqtt_client = mqtt.connect(url);
  mqtt_client.on('connect', function () {
    mqtt_client.subscribe(`gateway/${TMSN}/stateraw`);
  })
  mqtt_client.on('message', function (topic, message) {
    const int16arr = new Int16Array(message);
    console.log('topic=>', topic, int16arr);
    const a = unpack('CC', message);
    if (a[1] === 4) {
      getReg3ByMsg(message);
    }
  })
  const buf = Buffer.from('01040000002931D4', 'hex');
  mqtt_client.publish(`gateway/${TMSN}/ctr`, buf);
}