Milesight WS513: LoRaWAN Smart Wall Socket & Energy Monitor

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) {   // current (mA)
      data.current = readUInt16LE(bytes, i); i += 2;
    } else if (channel === 0x08 && type === 0x70) {   // socket state
      data.socket_status = bytes[i] === 1 ? "on" : "off"; i += 1;
    } else if (channel === 0x09 && type === 0x67) {   // temperature (°C)
      var t = readUInt16LE(bytes, i);
      if (t === 0xfffd) data.temperature_status = "over range";
      else if (t === 0xffff) data.temperature_status = "read failed";
      else data.temperature = readInt16LE(bytes, i) / 10;
      i += 2;
    } else {
      break;
    }
  }
  return { data: data };
}

function readUInt16LE(b, i) {
  return ((b[i + 1] << 8) | b[i]) & 0xffff;
}
function readInt16LE(b, i) {
  var v = readUInt16LE(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;
}