Question

我正在开发一个包含Bluegiga BLE113模块和Android应用程序的项目。在Bluegiga模块中，我设置了几个特征。对于一个特征，我定义了一个描述符来激活clie enter code here nt通知（在我的例子中，客户端是Android应用程序。）。 BLE113模块的特征定义如下：

 <characteristic uuid="dcfa2671-974d-4e4a-96cd-6221afeabb62"        id="ez1_flow_data_out">
     <!-- org.bluetooth.descriptor.gatt.characteristic_user_description -->
     <description>Data to transmit to Android device</description>
     <properties write="true" read="true" />
     <value variable_length="true" length="255" type="hex" />
     <!-- org.bluetooth.descriptor.gatt.client_characteristic_configuration -->
     <descriptor uuid="2902">
     <properties write="true" read="true" const="false" />
     <!-- Bit 0 = 1: Notifications enabled -->
    <value type="hex">0001</value>
    </descriptor>


   </characteristic>

在Android方面，我根据Android蓝牙低功耗指南在onServicesDiscovered（...）回调中设置了通知：

characteristic=gatt.getService(BLEuuids.DATAFLOW_SERVICE).getCharacteristic(BLEuuids.DATAFLOW_OUT_CHARACT);
//Enable local notifications
gatt.setCharacteristicNotification(characteristic, true);
//Enabled remote notifications
BluetoothGattDescriptor desc = characteristic.getDescriptor(BLEuuids.DATAFLOW_OUT_DESCRIPT);
boolean test;
test = desc.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE); // return value = true
test = gatt.readDescriptor(desc); // return value = true
test = gatt.writeDescriptor(desc); // return value = true

但是，如果我使用Bluegiga模块的串行接口更改DATAFLOW_OUT_CHARACT特征UUID的值，则不会在我的Android应用程序上触发onCharacteristicChanged（...）的预期回调。

我是否正确设置了描述符，或者我的Android代码是否失败？

Answer 1

现在启用通知以回调onCharactersticsChanged（）并设置属性ENABLE_NOTIFICATION_VALUE和ENABLE_INDICATION_VALUE

Log.d(TAG, "setCharacteristicNotification");
        if (mBluetoothAdapter == null || customBluetoothGatt == null) {
            Log.d(TAG, "BluetoothAdapter not initialized");
            return;
        }cx
        customBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
        descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
        descriptor.setValue(BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);
        boolean success = customBluetoothGatt.writeDescriptor(descriptor);

Android BLE onCharacteristicChanged（）未调用

1 个答案: