harmony 鸿蒙@system.bluetooth (Bluetooth)

2022-08-09
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@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The APIs provided by this module are no longer maintained since API version 7.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.