提供蓝牙ble实现一主多从的代码
时间: 2024-05-12 22:14:10 浏览: 21
下面是一个基于Arduino的蓝牙BLE实现一主多从的示例代码:
主设备代码:
```C++
#include <ArduinoBLE.h>
#define SERVICE_UUID "1d34d39c-23f9-4e9d-b7b6-b2f8b6e9a969"
#define CHARACTERISTIC_UUID "58c3c310-7b9f-4fbd-a2ec-0d3eeb452a1b"
BLEService service(SERVICE_UUID);
BLECharacteristic characteristic(CHARACTERISTIC_UUID, BLERead | BLENotify, 20);
bool deviceConnected = false;
void setup() {
Serial.begin(9600);
if (!BLE.begin()) {
Serial.println("Failed to initialize BLE!");
while (1);
}
BLE.setLocalName("Master");
BLE.setAdvertisedService(service);
service.addCharacteristic(characteristic);
BLE.addService(service);
characteristic.setValue("Hello, slaves!");
BLE.advertise();
Serial.println("Waiting for connections...");
}
void loop() {
if (deviceConnected) {
characteristic.setValue("Hello, slaves!");
characteristic.notify();
delay(1000);
}
BLEDevice central = BLE.central();
if (central) {
Serial.print("Connected to central: ");
Serial.println(central.address());
deviceConnected = true;
characteristic.setValue("Hello, slaves!");
characteristic.notify();
} else if (deviceConnected) {
Serial.println("Disconnected from central");
deviceConnected = false;
}
}
```
从设备代码:
```C++
#include <ArduinoBLE.h>
#define SERVICE_UUID "1d34d39c-23f9-4e9d-b7b6-b2f8b6e9a969"
#define CHARACTERISTIC_UUID "58c3c310-7b9f-4fbd-a2ec-0d3eeb452a1b"
BLEService service(SERVICE_UUID);
BLECharacteristic characteristic(CHARACTERISTIC_UUID, BLEWrite | BLENotify, 20);
bool deviceConnected = false;
void setup() {
Serial.begin(9600);
if (!BLE.begin()) {
Serial.println("Failed to initialize BLE!");
while (1);
}
BLE.setLocalName("Slave");
BLE.setAdvertisedService(service);
service.addCharacteristic(characteristic);
BLE.addService(service);
BLE.advertise();
Serial.println("Waiting for connections...");
}
void loop() {
if (deviceConnected) {
char data[20];
int bytesRead = characteristic.read(data, 20);
if (bytesRead > 0) {
Serial.print("Received data: ");
Serial.println(data);
}
}
BLEDevice central = BLE.central();
if (central) {
Serial.print("Connected to central: ");
Serial.println(central.address());
deviceConnected = true;
} else if (deviceConnected) {
Serial.println("Disconnected from central");
deviceConnected = false;
}
}
```
在这个示例中,主设备使用了一个BLECharacteristic对象来发送通知给所有连接的从设备。从设备则使用同一个BLECharacteristic对象来接收通知,并且可以使用read()函数来获取主设备发送的数据。
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