【发布时间】：2019-02-24 14:12:11
【问题描述】：
我需要与 BLE 温度计通信。工作流程是：
- 注册关于 NOTIFY 特征的通知
- 在 WRITE 中写入初始化字符串，WRITE NO RESPONSE 特性
- 数据开始进入已注册的 NOTIFY 特征
这个过程在 Nordic nRF Connect 应用中完美运行。
但是，当我自己使用以下 BluetoothGattCallback 对象执行此操作时，它会失败 - 我永远不会得到更新 - onCharacteristicRead 或 onCharacteristicChanged 回调永远不会触发。不过，一切正常 - 所有应该在成功时返回 true 的方法都返回 true ......无论如何，这里是 BluetoothGattCallback：
private BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
/**
* Callback indicating when GATT client has connected/disconnected to/from a remote
* GATT server.
*
* @param gatt GATT client
* @param status Status of the connect or disconnect operation.
* {@link BluetoothGatt#GATT_SUCCESS} if the operation succeeds.
* @param newState Returns the new connection state. Can be one of
* {@link BluetoothProfile#STATE_DISCONNECTED} or
* {@link BluetoothProfile#STATE_CONNECTED}
*/
@Override
public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
if (newState == BluetoothGatt.STATE_CONNECTED) {
gatt.discoverServices();
} else {
responseCharacteristic = null;
isConnected = false;
disconnected();
}
}
/**
* Callback invoked when the list of remote services, characteristics and descriptors
* for the remote device have been updated, ie new services have been discovered.
*
* @param gatt GATT client invoked {@link BluetoothGatt#discoverServices}
* @param status {@link BluetoothGatt#GATT_SUCCESS} if the remote device
*/
@Override
public void onServicesDiscovered(BluetoothGatt gatt, int status) {
Log.wtf("THERMO", "Services discovered");
BluetoothGattService thermoService = gatt.getService(THERMO_SERVICE);
if (thermoService != null) {
Log.wtf("THERMO", "Have service");
//Find the characteristic
configChar = thermoService.getCharacteristic(THERMO_CONFIGURATION);
responseCharacteristic = thermoService.getCharacteristic(THERMO_RESPONSE);
if (responseCharacteristic != null)
setCharacteristicNotification(responseCharacteristic, true);
else
incompatibleTarget();
} else
incompatibleTarget();
}
/**
* Callback triggered as a result of a remote characteristic notification.
*
* @param gatt GATT client the characteristic is associated with
* @param characteristic Characteristic that has been updated as a result
*/
@Override
public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
Log.wtf("THERMO", "onCharChanged");
dataReceived(characteristic);
}
@Override
public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
Log.wtf("THERMO", "onCharRead");
dataReceived(characteristic);
}
@Override
public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
Log.wtf("THERMO", "Write done");
if (status == BluetoothGatt.GATT_SUCCESS) {
Log.wtf("THERMO", "Write ok");
if (responseCharacteristic != null) {
Log.wtf("THERMO", "Have response");
isConnected = true;
connected();
}
} else {
}
}
@Override
public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
Log.wtf("THERMO", "onDescWrite");
if (status == BluetoothGatt.GATT_SUCCESS) {
if (configChar != null) {
Log.wtf("THERMO", "Have config");
configChar.setValue(thermoConfigData);
Log.wtf("THERMO", "Writing: " + gatt.writeCharacteristic(configChar));
}
}
}
};
这里是注册通知的方法：
private void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) {
gatt.setCharacteristicNotification(characteristic, enabled);
BluetoothGattDescriptor descriptor = characteristic.getDescriptor(CLIENT_CHARACTERISTIC_CONFIG);
if (descriptor != null) {
if (enabled) {
descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
} else {
descriptor.setValue(BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE);
}
Log.wtf("THERMO", "notifyDesc: " + gatt.writeDescriptor(descriptor));
}
}
通知启用方法适用于所有其他设备。任何想法我做错了什么？
【问题讨论】：
-
gatt.setCharacteristicNotification(characteristic, enabled);的结果是什么？
标签： android bluetooth-lowenergy