public PushingSenderSettings(PushingType type, PushingDeviceType deviceType, PushingTargetType targetType, int expiry = 0)
 {
     _expiry     = expiry < 0 ? 60 * 72 : expiry;
     _type       = type;
     _deviceType = deviceType;
     _targetType = targetType;
 }
 public PushingSenderSettings()
 {
     _expiry     = 60 * 72;
     _type       = PushingType.Message;
     _deviceType = PushingDeviceType.All;
     _targetType = PushingTargetType.Alias;
 }