帮我用qt写一个低功耗蓝牙BLE的代码，包含以下功能：搜索BLE设备、搜索BLE服务、启动BLE服务、发送和接受信息。

好的，我可以回答这个问题。以下是使用 Qt 编写低功耗蓝牙 BLE 的代码：

搜索 BLE 设备：

QBluetoothDeviceDiscoveryAgent *discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
connect(discoveryAgent, SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)), this, SLOT(deviceDiscovered(QBluetoothDeviceInfo)));
discoveryAgent->start();

搜索 BLE 服务：

QBluetoothServiceDiscoveryAgent *discoveryAgent = new QBluetoothServiceDiscoveryAgent(QBluetoothAddress(deviceAddress), this);
connect(discoveryAgent, SIGNAL(serviceDiscovered(QBluetoothServiceInfo)), this, SLOT(serviceDiscovered(QBluetoothServiceInfo)));
discoveryAgent->start();

启动 BLE 服务：

QBluetoothServer *server = new QBluetoothServer(QBluetoothServiceInfo::RfcommProtocol, this);
connect(server, SIGNAL(newConnection()), this, SLOT(clientConnected()));
server->listen(QBluetoothAddress::Any);

发送和接收信息：

QBluetoothSocket *socket = new QBluetoothSocket(QBluetoothServiceInfo::RfcommProtocol, this);
socket->connectToService(QBluetoothAddress(deviceAddress), QBluetoothUuid(serviceUuid));
socket->write(data);
socket->waitForBytesWritten();
connect(socket, SIGNAL(readyRead()), this, SLOT(readSocket()));

以上是使用 Qt 编写低功耗蓝牙 BLE 的代码，包含搜索 BLE 设备、搜索 BLE 服务、启动 BLE 服务、发送和接收信息的功能。