BluetoothGatt

Description

The BluetoothGatt interface of the Bluetooth API handles initial communications and connections with Gatt services.

Interface overview

[CheckAnyPermissions="bluetooth"]

interface BluetoothGatt : EventTarget

{

[Cached, Pure]

readonly attribute sequence<BluetoothGattService> services;

readonly attribute BluetoothConnectionState connectionState;

attribute EventHandler oncharacteristicchanged;

attribute EventHandler onconnectionstatechanged;

[NewObject] Promise<void> connect();

[NewObject] Promise<void> disconnect();

[NewObject] Promise<void> discoverServices();

[NewObject] Promise<short> readRemoteRssi();

};

Properties

• BluetoothGatt.services

      Returns the list of GATT services offered by the remote LE device. This property is set to an empty array by default before a connection is established.

• BluetoothGatt.connectionState

      The current connection state of GATT client to the remote LE device. This property is set to disconnected by default, before a connection is established.

Event handlers

• BluetoothGatt.oncharacteristicchanged

      Defines a handler to trigger as a result of the characteristicchanged event firing; this occurs when a remote characteristic changes.

• BluetoothGatt.onconnectionstatechanged

      Defines a handler to trigger as a result of the connectionstatechanged event firing; this occurs when the connection state of the GATT client to the remote LE device (i.e. the BluetoothGatt.connectionState property) changes.

Methods

• BluetoothGatt.connect()

      Connects to the remote LE device.

• BluetoothGatt.disconnect()

      Disconnects an already-established connection to a remote LE device.

• BluetoothGatt.discoverServices()

      Discovers services, characteristics, and descriptors offered by the remote GATT server.

• BluetoothGatt.readRemoteRssi()

      Reads the RSSI for a connected remote LE device.