Milesight WS558: LoRaWAN Smart Light Controller

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 === 0x03 && type === 0x74) {            // voltage (V)
      data.voltage = readUInt16LE(bytes, i) / 10; i += 2;
    } else if (channel === 0x04 && type === 0x80) {     // active power (W)
      data.active_power = readUInt32LE(bytes, i); i += 4;
    } else if (channel === 0x05 && type === 0x81) {     // power factor (%)
      data.power_factor = bytes[i]; i += 1;
    } else if (channel === 0x06 && type === 0x83) {     // power consumption (Wh)
      data.power_consumption = readUInt32LE(bytes, i); i += 4;
    } else if (channel === 0x07 && type === 0xc9) {     // total current (mA)
      data.total_current = readUInt16LE(bytes, i); i += 2;
    } else if (channel === 0x08 && type === 0x31) {     // 8 switch states (bit flags)
      var flags = bytes[i + 1];
      for (var s = 0; s < 8; s++) {
        data["switch_" + (s + 1)] = ((flags >> s) & 1) ? "on" : "off";
      }
      i += 2;
    } else {
      break;
    }
  }
  return { data: data };
}

function readUInt16LE(b, i) {
  return (b[i + 1] << 8) | b[i];
}
function readUInt32LE(b, i) {
  return ((b[i + 3] << 24) | (b[i + 2] << 16) | (b[i + 1] << 8) | b[i]) >>> 0;
}