harmony 鸿蒙@system.bluetooth (Bluetooth)

  • 2022-08-09
  • 浏览 (740)

@system.bluetooth (Bluetooth)

NOTE

  • The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.

  • The APIs provided by this module are no longer maintained since API version 7. You are advised to use profile APIs of @ohos.bluetooth.ble.

Modules to Import

import bluetooth from '@system.bluetooth';

bluetooth.startBLEScan(OBJECT)

Scans for Bluetooth Low Energy (BLE) devices nearby. This operation consumes system resources. Call bluetooth.stopBLEScan to stop the scan after a BLE device is detected and connected.

System capability: SystemCapability.Communication.Bluetooth.Lite

Parameters Table 1 StartBLEScanOptions

Name Type Mandatory Description
interval number No Interval for reporting device information, in milliseconds. The default value is 0, which means to report the detected device immediately and report other information at the given interval.
success Function No Called when the operation is successful.
fail Function No Called when the operation fails.
complete Function No Called when the execution is complete.

Example

  bluetooth.startBLEScan({
    interval:0,
    success() {
      console.log('call bluetooth.startBLEScan success.');
    },
    fail(code, data) {
      console.log('call bluetooth.startBLEScan failed, code:' + code + ', data:' + data);
    },
    complete() {
      console.log('call bluetooth.startBLEScan complete.');
    }
  });

bluetooth.stopBLEScan(OBJECT)

Stops scanning for BLE devices nearby. This API is used with bluetooth.startBLEScan(OBJECT) in pairs.

System capability: SystemCapability.Communication.Bluetooth.Lite

Parameters Table 2 StopBLEScanOptions

Name Type Mandatory Description
success Function No Called when the operation is successful.
fail Function No Called when the operation fails.
complete Function No Called when the execution is complete.

Example

  bluetooth.stopBLEScan({
    success() {
      console.log('call bluetooth.stopBLEScan success.');
    },
    fail(data, code) {
      console.log('call bluethooth.stopBLEScan fail, code:' + code + ', data:' + data);
    },
    complete() {
      console.log('call bluethooth.stopBLEScan complete.');
    }
  });

bluetooth.subscribeBLEFound(OBJECT)

Subscribes to the newly detected BLE device. If this API is called multiple times, the last call takes effect.

System capability: SystemCapability.Communication.Bluetooth.Lite

Parameters Table 3 SubscribeBLEFoundOptions

Name Type Mandatory Description
success Function Yes Called to report the newly detected device.
fail Function No Called when the operation fails.

Table 4 Return value in success

Name Type Description
devices Array<BluetoothDevice> List of the newly detected BLE devices.

Table 5 BluethoothDevice

Name Type Description
addrType string Device address type, which can be:
- public: a public address
- random: a random address
addr string MAC address of the device.
rssi number Received signal strength indicator (RSSl) of the device.
txpower string txpower field in the Bluetooth advertising data.
data hex string Bluetooth advertising data (including advertising data and scan response data), in a hexadecimal string.

Example

  bluetooth.subscribeBLEFound({
    success(data) {
      console.log('call bluetooth.subscribeBLEFound success, data: ${data}.');
    },
    fail(data, code) {
      console.log('call bluetooth.startBLEScan failed, code:' + code + ', data:' + data);
    }
  });

bluetooth.unsubscribeBLEFound()

Unsubscribes from the newly detected devices.

System capability: SystemCapability.Communication.Bluetooth.Lite

Example

  bluetooth.unsubscribeBLEFound();

Common Error Codes

Error Code Description
1100 The Bluetooth adapter is not initialized.
1101 The Bluetooth adapter is unavailable.
1102 The specified device is not found.
1103 Connection failed.
1104 The specified service is not found.
1105 The specified characteristic value is not found.
1106 The Bluetooth device is disconnected.
1107 The characteristic value does not support this operation.
1108 Other exceptions reported by the system.
1109 The system version does not support BLE.

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