# @ohos.bluetooth.hfp (Bluetooth HFP Module) (System API)

The **hfp** module provides APIs for using the Bluetooth Hands-Free Profile (HFP).

> **NOTE**
>
> - The initial APIs of this module are supported since API version 10. Newly added APIs will be marked with a superscript to indicate their earliest API version.
> - This topic describes only the system APIs provided by the module. For details about its public APIs, see [@ohos.bluetooth.hfp (Bluetooth HFP Module)](js-apis-bluetooth-hfp.md).


## Modules to Import

```js
import { hfp } from '@kit.ConnectivityKit';
```


### connect

connect(deviceId: string): void

Connects to a hands-free device.

**System API**: This is a system API.

**Required permissions**: ohos.permission.ACCESS_BLUETOOTH

**System capability**: SystemCapability.Communication.Bluetooth.Core

**Parameters**

| Name   | Type    | Mandatory  | Description     |
| ------ | ------ | ---- | ------- |
| deviceId | string | Yes   | Address of the remote device.|

**Error codes**

For details about the error codes, see [Bluetooth Error Codes](errorcode-bluetoothManager.md).

| ID| Error Message|
| -------- | ---------------------------- |
|201 | Permission denied.                 |
|202 | Non-system applications are not allowed to use system APIs. |
|401 | Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.                 |
|801 | Capability not supported.          |
|2900001 | Service stopped.                         |
|2900003 | Bluetooth disabled.                 |
|2900004 | Profile not supported.                |
|2900099 | Operation failed.                        |

**Example**

```js
import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let hfpAg = hfp.createHfpAgProfile();
    hfpAg.connect('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}
```


### disconnect

disconnect(deviceId: string): void

Disconnects from a hands-free device.

**System API**: This is a system API.

**Required permissions**: ohos.permission.ACCESS_BLUETOOTH

**System capability**: SystemCapability.Communication.Bluetooth.Core

**Parameters**

| Name   | Type    | Mandatory  | Description     |
| ------ | ------ | ---- | ------- |
| deviceId | string | Yes   | Address of the remote device.|

**Error codes**

For details about the error codes, see [Bluetooth Error Codes](errorcode-bluetoothManager.md).

| ID| Error Message|
| -------- | ---------------------------- |
|201 | Permission denied.                 |
|202 | Non-system applications are not allowed to use system APIs. |
|401 | Invalid parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3. Parameter verification failed.                 |
|801 | Capability not supported.          |
|2900001 | Service stopped.                         |
|2900003 | Bluetooth disabled.                 |
|2900004 | Profile not supported.                |
|2900099 | Operation failed.                        |

**Example**

```js
import { AsyncCallback, BusinessError } from '@kit.BasicServicesKit';
try {
    let hfpAg = hfp.createHfpAgProfile();
    hfpAg.disconnect('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}
```