Milesight VS330: LoRaWAN Restroom Occupancy 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 === 0x01 && type === 0x75) {          // battery (%)
      data.battery = bytes[i]; i += 1;
    } else if (channel === 0x02 && type === 0x82) {   // distance (mm, UINT16 LE)
      data.distance = readUInt16LE(bytes, i); i += 2;
    } else if (channel === 0x03 && type === 0x8e) {   // occupancy
      data.occupancy = bytes[i] === 1 ? "occupied" : "vacant"; i += 1;
    } else if (channel === 0x04 && type === 0x8e) {   // calibration status
      data.calibration_status = bytes[i] === 1 ? "success" : "failed"; i += 1;
    } else {
      break;
    }
  }
  return { data: data };
}

function readUInt16LE(b, i) {
  return ((b[i + 1] << 8) | b[i]) & 0xffff;
}