Milesight WS502: LoRaWAN 2-Gang Smart Wall Switch

function decodeUplink(input) {
  var bytes = input.bytes;
  var data = {};

  for (var i = 0; i < bytes.length; ) {
    var channel = bytes[i++];
    var type = bytes[i++];

    // Switch state: 1 byte. bits 0/1 = state of switch_1/switch_2,
    // bits 4/5 = "changed in this uplink" flag for switch_1/switch_2.
    if (channel === 0xff && type === 0x29) {
      var v = bytes[i]; i += 1;
      data.switch_1 = (v & 0x01) ? "on" : "off";
      data.switch_2 = (v & 0x02) ? "on" : "off";
      data.switch_1_change = ((v >> 4) & 0x01) ? "yes" : "no";
      data.switch_2_change = ((v >> 5) & 0x01) ? "yes" : "no";

    // Function key event: 1 byte (0 = no, 1 = yes)
    } else if (channel === 0xff && type === 0x2b) {
      data.function_key_event = bytes[i] ? "yes" : "no"; i += 1;

    // Device status: 1 byte (0 = off, 1 = on)
    } else if (channel === 0xff && type === 0x0b) {
      data.device_status = bytes[i] ? "on" : "off"; i += 1;

    // LoRaWAN class
    } else if (channel === 0xff && type === 0x0f) {
      data.lorawan_class = readClass(bytes[i]); i += 1;

    // Reset / reboot event
    } else if (channel === 0xff && type === 0xfe) {
      data.reset_event = "reset"; i += 1;

    // Serial number (6 bytes)
    } else if (channel === 0xff && type === 0x08) {
      data.sn = readHex(bytes, i, 6); i += 6;

    // IPSO version (1 byte, skip)
    } else if (channel === 0xff && type === 0x01) {
      i += 1;
    // Hardware / firmware version (2 bytes each, skip)
    } else if (channel === 0xff && (type === 0x09 || type === 0x0a)) {
      i += 2;
    // TSL version (2 bytes, skip)
    } else if (channel === 0xff && type === 0xff) {
      i += 2;
    } else {
      break;
    }
  }
  return { data: data };
}

function readClass(b) {
  var map = { 0: "Class A", 1: "Class B", 2: "Class C", 3: "Class CtoB" };
  return map[b] || "unknown";
}

function readHex(b, i, len) {
  var s = "";
  for (var k = 0; k < len; k++) {
    s += ("0" + (b[i + k] & 0xff).toString(16)).slice(-2);
  }
  return s;
}