Milesight EM300-MCS: LoRaWAN Magnet Contact 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 === 0x67) {   // temperature (°C)
      data.temperature = readInt16LE(bytes, i) / 10; i += 2;
    } else if (channel === 0x04 && type === 0x68) {   // humidity (%RH)
      data.humidity = bytes[i] / 2; i += 1;
    } else if (channel === 0x06 && type === 0x00) {   // magnet contact
      data.magnet_status = bytes[i] === 0 ? "close" : "open"; i += 1;
    } else {
      break;
    }
  }
  return { data: data };
}

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