syncUnixTime method
Implementation
List<int> syncUnixTime(DateTime now) {
final unixTimestamp = now.millisecondsSinceEpoch ~/ 1000; // 转换为秒
final bytes = Uint8List(4);
bytes[0] = unixTimestamp & 0xFF;
bytes[1] = (unixTimestamp >> 8) & 0xFF;
bytes[2] = (unixTimestamp >> 16) & 0xFF;
bytes[3] = (unixTimestamp >> 24) & 0xFF;
final payload = [0x45, ...bytes];
return ElinkCmdUtils.getElinkA6Data(payload);
}