@ohos.bluetooth.connection (Bluetooth Connection Module)

The connection module provides APIs for operating and managing Bluetooth.

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.

Modules to Import

import connection from '@ohos.bluetooth.connection';

connection.pairDevice

pairDevice(deviceId: string, callback: AsyncCallback<void>): void

Pairs a Bluetooth device. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    // The address can be scanned.
    connection.pairDevice('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.pairDevice

pairDevice(deviceId: string): Promise<void>

Pairs a Bluetooth device. This API uses a promise to return the result.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    // The address can be scanned.
    connection.pairDevice('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.getRemoteDeviceName

getRemoteDeviceName(deviceId: string): string

Obtains the name of a remote Bluetooth device.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    let remoteDeviceName: string = connection.getRemoteDeviceName('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.getRemoteDeviceClass

getRemoteDeviceClass(deviceId: string): DeviceClass

Obtains the class of a remote Bluetooth device.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    let remoteDeviceClass: connection.DeviceClass = connection.getRemoteDeviceClass('XX:XX:XX:XX:XX:XX');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.getLocalName

getLocalName(): string

Obtains the name of the local Bluetooth device.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    let localName: string = connection.getLocalName();
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.getPairedDevices

getPairedDevices(): Array<string>

Obtains the paired devices.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    let devices: Array<string> = connection.getPairedDevices();
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.getPairState¹¹⁺

getPairState(deviceId: string): BondState

Obtains the Bluetooth pairing state.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    let res: connection.BondState = connection.getPairState("XX:XX:XX:XX:XX:XX");
    console.log('getPairState: ' + res);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.getProfileConnectionState

getProfileConnectionState(profileId?: ProfileId): ProfileConnectionState

Obtains the connection state of a Bluetooth profile. The ProfileId parameter is optional. If ProfileId is specified, the connection state of the specified profile is returned. If no ProfileId is specified, STATE_CONNECTED is returned by any connected profile. If no profile is connected, STATE_DISCONNECTED is returned.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
import constant from '@ohos.bluetooth.constant';
try {
    let result: connection.ProfileConnectionState = connection.getProfileConnectionState(constant.ProfileId.PROFILE_A2DP_SOURCE);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.setDevicePairingConfirmation

setDevicePairingConfirmation(deviceId: string, accept: boolean): void

Sets the device pairing confirmation.

Required permissions: ohos.permission.ACCESS_BLUETOOTH and ohos.permission.MANAGE_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
// Subscribe to the pinRequired event and configure the pairing confirmation after receiving a pairing request from the remote device.
function onReceivePinRequiredEvent(data: connection.PinRequiredParam) { // data is the input parameter for the pairing request.
    console.info('pin required  = '+ JSON.stringify(data));
    connection.setDevicePairingConfirmation(data.deviceId, true);
}
try {
    connection.on('pinRequired', onReceivePinRequiredEvent);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.setDevicePinCode

setDevicePinCode(deviceId: string, code: string, callback: AsyncCallback<void>): void

Sets the PIN for the device when PinType is PIN_TYPE_ENTER_PIN_CODE or PIN_TYPE_PIN_16_DIGITS.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
//callback
try {
    connection.setDevicePinCode('11:22:33:44:55:66', '12345', (err: BusinessError) => {
        console.info('setDevicePinCode,device name err:' + JSON.stringify(err));
    });
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.setDevicePinCode

setDevicePinCode(deviceId: string, code: string): Promise<void>

Sets the PIN for the device when PinType is PIN_TYPE_ENTER_PIN_CODE or PIN_TYPE_PIN_16_DIGITS.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
//promise
try {
    connection.setDevicePinCode('11:22:33:44:55:66', '12345').then(() => {
        console.info('setDevicePinCode');
    }, (error: BusinessError) => {
        console.info('setDevicePinCode: errCode:' + error.code + ',errMessage' + error.message);
    })

} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.setLocalName

setLocalName(name: string): void

Sets the name of the local Bluetooth device.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    connection.setLocalName('device_name');
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.setBluetoothScanMode

setBluetoothScanMode(mode: ScanMode, duration: number): void

Sets the Bluetooth scan mode so that the device can be discovered by a remote device.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    // The device can be discovered and connected only when the discoverable and connectable mode is used.
    connection.setBluetoothScanMode(connection.ScanMode.SCAN_MODE_CONNECTABLE_GENERAL_DISCOVERABLE, 100);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.getBluetoothScanMode

getBluetoothScanMode(): ScanMode

Obtains the Bluetooth scan mode.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    let scanMode: connection.ScanMode = connection.getBluetoothScanMode();
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.startBluetoothDiscovery

startBluetoothDiscovery(): void

Starts discovery of Bluetooth devices.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
function onReceiveEvent(data: Array<string>) {
    console.log('data length' + data.length);
}
try {
    connection.on('bluetoothDeviceFind', onReceiveEvent);
    connection.startBluetoothDiscovery();
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.stopBluetoothDiscovery

stopBluetoothDiscovery(): void

Stops discovery of Bluetooth devices.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    connection.stopBluetoothDiscovery();
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.isBluetoothDiscovering¹¹⁺

isBluetoothDiscovering(): boolean

Checks whether Bluetooth discovery is enabled.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Return value

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
try {
    let res: boolean = connection.isBluetoothDiscovering();
    console.log('isBluetoothDiscovering: ' + res);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.on('bluetoothDeviceFind')

on(type: 'bluetoothDeviceFind', callback: Callback<Array<string>>): void

Subscribes to the discovery of a Bluetooth device.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
function onReceiveEvent(data: Array<string>) { // data is an array of Bluetooth device addresses.
    console.info('bluetooth device find = '+ JSON.stringify(data));
}
try {
    connection.on('bluetoothDeviceFind', onReceiveEvent);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.off('bluetoothDeviceFind')

off(type: 'bluetoothDeviceFind', callback?: Callback<Array<string>>): void

Unsubscribes from the discovery of a Bluetooth device.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
function onReceiveEvent(data: Array<string>) {
    console.info('bluetooth device find = '+ JSON.stringify(data));
}
try {
    connection.on('bluetoothDeviceFind', onReceiveEvent);
    connection.off('bluetoothDeviceFind', onReceiveEvent);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.on('bondStateChange')

on(type: 'bondStateChange', callback: Callback<BondStateParam>): void

Subscribes to Bluetooth pairing state changes.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
function onReceiveEvent(data: connection.BondStateParam) { // data, as the input parameter of the callback, indicates the pairing state.
    console.info('pair state = '+ JSON.stringify(data));
}
try {
    connection.on('bondStateChange', onReceiveEvent);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.off('bondStateChange')

off(type: 'bondStateChange', callback?: Callback<BondStateParam>): void

Unsubscribes from Bluetooth pairing state changes.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
function onReceiveEvent(data: connection.BondStateParam) {
    console.info('bond state = '+ JSON.stringify(data));
}
try {
    connection.on('bondStateChange', onReceiveEvent);
    connection.off('bondStateChange', onReceiveEvent);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.on('pinRequired')

on(type: 'pinRequired', callback: Callback<PinRequiredParam>): void

Subscribes to the pairing request events of the remote Bluetooth device.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
function onReceiveEvent(data: connection.PinRequiredParam) { // data is the pairing request parameter.
    console.info('pin required = '+ JSON.stringify(data));
}
try {
    connection.on('pinRequired', onReceiveEvent);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

connection.off('pinRequired')

off(type: 'pinRequired', callback?: Callback<PinRequiredParam>): void

Unsubscribes from the pairing request events of the remote Bluetooth device.

Required permissions: ohos.permission.ACCESS_BLUETOOTH

System capability: SystemCapability.Communication.Bluetooth.Core

Parameters

Error codes

For details about the error codes, see Bluetooth Error Codes.

Example

import { BusinessError } from '@ohos.base';
function onReceiveEvent(data: connection.PinRequiredParam) {
    console.info('pin required = '+ JSON.stringify(data));
}
try {
    connection.on('pinRequired', onReceiveEvent);
    connection.off('pinRequired', onReceiveEvent);
} catch (err) {
    console.error('errCode: ' + (err as BusinessError).code + ', errMessage: ' + (err as BusinessError).message);
}

BondStateParam

Represents the pairing state parameters.

System capability: SystemCapability.Communication.Bluetooth.Core

PinRequiredParam

Represents the pairing request parameters.

System capability: SystemCapability.Communication.Bluetooth.Core

DeviceClass

Represents the class of a Bluetooth device.

System capability: SystemCapability.Communication.Bluetooth.Core

BluetoothTransport

Enumerates the device types. The default device type is TRANSPORT_BR_EDR.

System capability: SystemCapability.Communication.Bluetooth.Core

ScanMode

Enumerates the scan modes.

System capability: SystemCapability.Communication.Bluetooth.Core

BondState

Enumerates the pairing states.

System capability: SystemCapability.Communication.Bluetooth.Core