Milesight EM310-TILT: LoRaWAN 3-Axis Tilt 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 === 0x03 && type === 0xcf) {   // 3-axis tilt angle
      data.angle_x = readInt16LE(bytes, i) / 100;
      data.angle_y = readInt16LE(bytes, i + 2) / 100;
      data.angle_z = readInt16LE(bytes, i + 4) / 100;
      var flags = bytes[i + 6];
      data.threshold_x = (flags & 0x01) ? 1 : 0;
      data.threshold_y = (flags >> 1 & 0x01) ? 1 : 0;
      data.threshold_z = (flags >> 2 & 0x01) ? 1 : 0;
      i += 7;
    } else {
      break;
    }
  }
  return { data: data };
}

function readInt16LE(b, i) {
  var v = (b[i + 1] << 8) | b[i];
  return v > 0x7fff ? v - 0x10000 : v;
}