fromPacket static method

PiPacket fromPacket(String raw)

fromPacket creates a PiPacket from a string packet in the format of Layrz Protocol v3.

Implementation

static PiPacket fromPacket(String raw) {
  if (!raw.startsWith('<Pi>') || !raw.endsWith('</Pi>')) {
    throw ParseException('Invalid identification packet, should be <Pi>...</Pi>');
  }

  final parts = raw.substring(4, raw.length - 5).split(';');
  if (parts.length != 9) {
    throw MalformedException('Invalid packet parts, should have 6 parts');
  }

  int? receivedCrc = int.tryParse(parts[8], radix: 16);
  int? calculatedCrc = calculateCrc("${parts.sublist(0, 8).join(';')};".codeUnits);

  if (receivedCrc != calculatedCrc) {
    throw CrcException('Invalid CRC, received: $receivedCrc, calculated: $calculatedCrc');
  }

  int? firmwareBuild = int.tryParse(parts[2]);
  if (firmwareBuild == null) {
    throw MalformedException('Invalid firmware build number');
  }

  bool fotaEnabled = parts[7].toLowerCase() == 'true' || parts[7] == '1';

  return PiPacket(
    ident: parts[0],
    firmwareId: parts[1],
    firmwareBuild: firmwareBuild,
    deviceId: parts[3],
    hardwareId: parts[4],
    modelId: parts[5],
    firmwareBranch: parts[6] == '1' ? FirmwareBranch.development : FirmwareBranch.stable,
    fotaEnabled: fotaEnabled,
  );
}