Milesight TS101: LoRaWAN Insertion Temperature Sensor

function decodeUplink(input) {
  var bytes = input.bytes;
  var data = {};

  for (var i = 0; i < bytes.length; ) {
    var channel = bytes[i++];
    var type = bytes[i++];

    if (channel === 0xff) {                            // device info on join / power-on
      i += deviceInfoLen(type);
    } else if (channel === 0x01 && type === 0x75) {    // battery (%)
      data.battery = bytes[i]; i += 1;
    } else if (channel === 0x03 && type === 0x67) {    // temperature (deg C)
      data.temperature = readInt16LE(bytes, i) / 10; i += 2;
    } else if (channel === 0x83 && type === 0x67) {    // threshold alarm
      data.temperature = readInt16LE(bytes, i) / 10;
      data.alarm = readAlarm(bytes[i + 2]); i += 3;
    } else if (channel === 0x93 && type === 0xd7) {    // mutation (abrupt-change) alarm
      data.temperature = readInt16LE(bytes, i) / 10;
      data.temperature_mutation = readInt16LE(bytes, i + 2) / 100;
      data.alarm = readAlarm(bytes[i + 4]); i += 5;
    } else if (channel === 0x20 && type === 0xce) {    // history: ts + temperature
      data.history = data.history || [];
      data.history.push({
        timestamp: readUInt32LE(bytes, i),
        temperature: readInt16LE(bytes, i + 4) / 10
      });
      i += 6;
    } else {
      break;
    }
  }
  return { data: data };
}

function readInt16LE(b, i) {
  var v = (b[i + 1] << 8) | b[i];
  return v > 0x7fff ? v - 0x10000 : v;
}
function readUInt32LE(b, i) {
  return ((b[i+3]<<24)|(b[i+2]<<16)|(b[i+1]<<8)|b[i]) >>> 0;
}
function readAlarm(v) {
  var map = { 0: "release", 1: "threshold", 2: "mutation" };
  return map[v] !== undefined ? map[v] : v;
}
function deviceInfoLen(type) {
  // 0xFF info segments (protocol/hw/fw/SN/class); lengths are firmware-specific
  if (type === 0x16) return 8;   // serial number
  if (type === 0x09 || type === 0x0a || type === 0xff) return 2;
  return 1;
}