// 信号强度等级枚举
enum SignalLevel {
  none(0, '无信号'),
  poor(1, '信号弱'),
  fair(2, '信号中'),
  good(3, '信号良'),
  excellent(4, '信号强');

  final int level;
  final String description;
  const SignalLevel(this.level, this.description);
}