# AsReaderLfDevice

## `sharedInstance`

Creates and initializes an AsReaderLfDevice object (Singleton pattern).

```objectivec
+ (instancetype)sharedInstance;
```

---

## `startScan`

Starts automatic tag (RFID) reading operation. Tag IDs are sent to the user via notification packets.  
After executing this method, the result is returned via the callback [`receivedScanData`](../common/common/8_AsReaderDeviceProtocol.md#receivedscandata).

```objectivec
- (BOOL)startScan:(int)numberOfTags readUntilInSec:(int)readUntilInSec repeatCycle:(int)repeatCycle;
```

### Parameters

```{list-table}
:align: left
:class: list-table

* - Name
  - Type
  - Description
* - `numberOfTags`
  - int
  - Maximum number of tags to read
* - `readUntilInSec`
  - int
  - Maximum duration of a single read (seconds)
* - `repeatCycle`
  - int
  - Number of times to repeat a single read
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - BOOL
  - Method execution result: `YES` success, `NO` failure
```

---

## `stopScan`

Stops tag reading.

```objectivec
- (BOOL)stopScan;
```

### Return Value

```{list-table}
:align: left
:class: list-table

* - Type
  - Description
* - BOOL
  - Method execution result: `YES` success, `NO` failure
```