ble可以使用class of device这个参数吗?
时间: 2023-05-11 09:07:14 浏览: 64
可以使用class of device这个参数来指定BLE设备的类型。BLE设备的类型可以通过class of device参数来指定,这个参数包含了三个字节,分别用于表示设备的主要服务类别、次要服务类别和设备的应用类别。BLE设备的类型可以用于设备的发现和连接,以及用于确定设备的功能和特性。
相关问题
可以像连接普通BLE设备那样连接HID外设吗?
不可以,连接HID设备是需要遵循HID协议的。HID设备与普通BLE设备不同,它们使用不同的蓝牙协议。HID协议定义了一种标准的设备类别,包括键盘、鼠标、手柄等。HID设备与普通BLE设备的连接方式也不同,HID设备需要使用RFCOMM通信协议,而不是GATT协议。
在Android中,连接HID设备需要使用BluetoothHidDeviceProfile类,该类提供了连接和通信HID设备的接口。您需要创建一个BluetoothHidDeviceProfile对象,并实现BluetoothHidDeviceProfile.ServiceListener接口来接收连接和通信事件。
以下是一个简单的示例代码,用于连接HID设备:
```
public class HidDeviceService extends Service implements BluetoothHidDeviceProfile.ServiceListener {
private BluetoothAdapter mBluetoothAdapter;
private BluetoothHidDevice mBluetoothHidDevice;
@Override
public void onCreate() {
super.onCreate();
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mBluetoothHidDevice = new BluetoothHidDevice(this, this);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivity(enableBtIntent);
} else {
mBluetoothHidDevice.registerApp(
new BluetoothHidDeviceAppSdpSettings(
"HID Device",
"Android",
"",
BluetoothHidDevice.SUBCLASS1_COMBO,
new byte[]{(byte) 0x22, (byte) 0x24, (byte) 0x2a},
new BluetoothHidDeviceAppSdpSettings.Service[]{new BluetoothHidDeviceAppSdpSettings.Service(
BluetoothHidDevice.SUBCLASS1_COMBO,
BluetoothHidDevice.PROTOCOL_BOOT,
BluetoothHidDevice.SERVICE_NAME,
BluetoothHidDevice.SERVICE_DESCRIPTION,
BluetoothHidDevice.SERVICE_PROVIDER)}));
}
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onServiceStateChanged(BluetoothDevice device, int state) {
// 连接状态变化回调
if (state == BluetoothProfile.STATE_CONNECTED) {
// HID设备已连接
} else if (state == BluetoothProfile.STATE_DISCONNECTED) {
// HID设备已断开连接
}
}
@Override
public void onGetReport(BluetoothDevice device, byte type, byte id, int bufferSize) {
// 获取报告请求回调
}
@Override
public void onSetReport(BluetoothDevice device, byte type, byte id, byte[] data) {
// 设置报告请求回调
}
@Override
public void onSetProtocol(BluetoothDevice device, byte protocol) {
// 设置协议请求回调
}
@Override
public void onIntrData(BluetoothDevice device, byte reportId, byte[] data) {
// 中断包数据回调
}
}
```
以上是一个基本的HID设备服务,它使用BluetoothHidDeviceProfile连接和通信HID设备。您需要在AndroidManifest.xml文件中声明该服务,并在必要的时候请求蓝牙权限。
Compilation error: 'handleEvents' is not a member of 'BLEDevice'
I apologize for the confusion. The `handleEvents()` function is not available in the Arduino ESP32 BLE library. Instead, you can use the `BLEDevice::loop()` function to handle BLE events. Here's an updated version of the code:
```cpp
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>
#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"
BLECharacteristic *pCharacteristic;
class MyServerCallbacks : public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
Serial.println("Device connected");
}
void onDisconnect(BLEServer* pServer) {
Serial.println("Device disconnected");
}
};
void setup() {
Serial.begin(115200);
BLEDevice::init("MyESP32");
BLEServer *pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
BLEService *pService = pServer->createService(SERVICE_UUID);
pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE
);
pCharacteristic->setValue("Hello World");
pService->start();
BLEAdvertising *pAdvertising = pServer->getAdvertising(); // Updated line
pAdvertising->addServiceUUID(SERVICE_UUID);
pAdvertising->setScanResponse(false);
pAdvertising->start();
}
void loop() {
BLEDevice::loop(); // Updated line
}
```
Please replace the previous `BLEDevice::handleEvents()` line with `BLEDevice::loop()`. This should resolve the compilation error.
Please note that the `BLEDevice::loop()` function must be called frequently in the `loop()` function to handle BLE events.