使用 Android 应用程序从 BLE 温度计读取温度

Question

我购买了一个 BLE 温度计并开发了一个 Android 应用程序来读取温度。我安装了 nRF connect，并且能够看到列出的 BLE 设备及其所有服务。温度测量特性标记为“指示”。我似乎没有找到如何在 nRF 中得到这个指示。当我使用 BLE 设备读取温度时没有任何反应。该温度未反映在 nRF 日志中。

我开发了一个 Android 应用程序，能够扫描该 BLE 设备、连接到它并启用指示。但是当我使用 BLE 设备测量温度时，onCharacteristicChanged 永远不会被调用。我的代码如下。

private final UUID temperatureServiceUuid = UUID.fromString("00001809-0000-1000-8000-00805f9b34fb");
private final UUID temperatureMeasureUuid = UUID.fromString("00002A1C-0000-1000-8000-00805f9b34fb");
private final UUID temperatureDescriptorUuid = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");

public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) {
        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        BluetoothGattDescriptor descriptor = characteristic.getDescriptor(temperatureDescriptorUuid);
        mBluetoothGatt.writeDescriptor(descriptor, BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);

    }

Answer 1

private final UUID temperatureServiceUuid = UUID.fromString("00001809-0000-1000-8000-00805f9b34fb");
private final UUID temperatureMeasureUuid = UUID.fromString("00002A1C-0000-1000-8000-00805f9b34fb");
private final UUID temperatureDescriptorUuid = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");

private void setNotificationTemp(BluetoothGatt gatt) {
    BluetoothGattService temperatureService = gatt.getService(temperatureServiceUuid);
    BluetoothGattCharacteristic temperatureChar = temperatureService.getCharacteristic(temperatureMeasureUuid);
    gatt.setCharacteristicNotification(temperatureChar, true)

    BluetoothGattDescriptor temperatureDescriptor = temperatureChar.getDescriptor(temperatureDescriptorUuid);
    gatt.writeDescriptor(temperatureDescriptor, BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);
}