B2G/Bluetooth/WebBluetooth-v2/BluetoothGattCharacteristic: Difference between revisions

B2G/Bluetooth/WebBluetooth-v2/BluetoothGattCharacteristic (view source)

Revision as of 08:04, 18 September 2014

1,361 bytes removed , 18 September 2014

→‎Methods

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 * [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGattCharacteristic#startNotifications.28.29|BluetoothGattCharacteristic.startNotifications()]]
 * [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGattCharacteristic#stopNotifications.28.29|BluetoothGattCharacteristic.stopNotifications()]]
-* [[B2G/Bluetooth/WebBluetooth-v2/BluetoothGattCharacteristic#findDescriptor.28DOMString uuid.29|BluetoothGattCharacteristic.findDescriptor(DOMString uuid)]]
 === readValue() ===
@@ Line 195: / Line 194: @@
 ; Return
 : A Promise to indicate whether the operation is resolved or rejected. The Promise is rejected if there is no Client Characteristic Configuration descriptor (CCCD) for this characteristic.
-=== findDescriptor(DOMString uuid) ===
-; Description
-: The method finds a descriptor of this characteristic from the descriptors property by the given UUID. When multiple descriptors with the same UUID exist, the first one is returned.
-; Parameters
-: ''uuid''
-:: UUID DOMString of the descriptor to seek for.
-; Return
-: The first descriptor with the given uuid in descriptors property. A null pointer is returned if no descriptor is found by the given UUID.
-; Sample
- const HEART_RATE_SERVICE = "0000180d-0000-1000-8000-00805f9b34fb";
- const HEART_RATE_MEASUREMENT = "00002a37-0000-1000-8000-00805f9b34fb";
- const CLIENT_CHAR_CONFIG = "00002902-0000-1000-8000-00805f9b34fb";
- if (device.gatt) {
-   // get heart rate service
-   var heartRateService = device.gatt.findService(HEART_RATE_SERVICE));
-   // get heart rate measurement characteristic from service
-   if (heartRateService) {
-     var heartRateMeasurement =
-       heartRateService.findCharacteristic(HEART_RATE_MEASUREMENT);
-     // get Client Characteristic Configuration descriptor from characteristic
-     if (heartRateMeasurement) {
-       var cccd = heartRateMeasurement.findDescriptor(CLIENT_CHAR_CONFIG);
-     }
-   }
- }