用C/C++写一个蓝牙perpheral和central之间通信的代码-Go服务器开发

以下是一个基于C/C++的蓝牙通信示例，使用Linux BlueZ栈实现Peripheral（外设）和Central（中心设备）之间的通信。由于代码较长且需要多文件配合，这里提供核心功能的简化示例：

Peripheral设备代码（广播数据并等待连接）

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/gatt.h>
#include <bluetooth/gatt-server.h>

// 初始化GATT服务（简化示例）
static struct bt_gatt_server *server;

// 特征值读写回调
static ssize_t read_value_cb(struct bt_conn *conn, const struct bt_gatt_attr *attr, void *buf, uint16_t len, uint16_t offset) {
    const char *value = "Hello from Peripheral!";
    return bt_gatt_attr_read(conn, attr, buf, len, offset, value, strlen(value));
}

static ssize_t write_value_cb(struct bt_conn *conn, const struct bt_gatt_attr *attr, const void *buf, uint16_t len, uint16_t offset, uint8_t flags) {
    printf("Received data: %s\n", (char*)buf);
    return len;
}

// GATT服务定义
static struct bt_gatt_attr attrs[] = {
    BT_GATT_PRIMARY_SERVICE(BT_UUID_GATT),
    BT_GATT_CHARACTERISTIC(BT_UUID_GATT_CHRC, BT_GATT_CHRC_READ | BT_GATT_CHRC_WRITE),
    BT_GATT_DESCRIPTOR(BT_UUID_GATT_DESC, BT_GATT_PERM_READ | BT_GATT_PERM_WRITE, read_value_cb, write_value_cb, NULL),
};

static struct bt_gatt_service gatt_svc = BT_GATT_SERVICE(attrs);

int main() {
    // 初始化蓝牙适配器
    int dev_id = hci_get_route(NULL);
    int sock = hci_open_dev(dev_id);
    
    // 启用LE广播
    le_set_advertise_enable(sock, 1);
    
    // 注册GATT服务
    server = bt_gatt_server_new();
    bt_gatt_server_add_service(server, &gatt_svc);
    
    printf("Peripheral is advertising...\n");
    while (1) { sleep(1); }
    
    close(sock);
    return 0;
}

Central设备代码（扫描并连接Peripheral）

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/gatt.h>

// 发现服务回调
static void discover_services_cb(int err, struct bt_gatt_discover_list *list) {
    if (err) {
        printf("Service discovery failed: %d\n", err);
        return;
    }
    printf("Services discovered successfully!\n");
}

// 连接建立回调
static void connect_cb(int err, struct bt_conn *conn) {
    if (err) {
        printf("Connection failed: %d\n", err);
        return;
    }
    
    // 发现服务
    struct bt_gatt_discover_params params = {
        .start_handle = BT_ATT_FIRST_ATTR_HANDLE,
        .end_handle = BT_ATT_LAST_ATTR_HANDLE,
        .callback = discover_services_cb,
    };
    
    bt_gatt_discover_services(conn, &params);
}

int main() {
    // 扫描周边设备
    int dev_id = hci_get_route(NULL);
    int sock = hci_open_dev(dev_id);
    
    // 开始LE扫描（需实现扫描结果解析）
    le_set_scan_parameters(sock);
    le_set_scan_enable(sock, 1);
    
    // 假设找到目标设备地址（实际需从扫描结果获取）
    bdaddr_t target_addr = {{0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF}};
    
    // 发起连接
    struct bt_conn *conn = bt_conn_create_le(&target_addr);
    bt_conn_set_callback(conn, connect_cb);
    
    printf("Central connecting...\n");
    
     while (1) { sleep(1); }
     
     close(sock);
     return 0;
}

编译与运行说明

依赖库:
- Linux系统需安装BlueZ开发库：sudo apt-get install libbluetooth-dev
- 编译时链接蓝牙库：gcc -o peripheral peripheral.c -lbluetooth
权限要求:
- 需要以root权限运行或授予CAP_NET_ADMIN能力：sudo setcap cap-net_admin+ep ./peripheral
实际开发注意事项:
- BlueZ提供了DBus API，实际开发建议使用dbus-c++或bluepy等高级封装库
- Peripheral需实现完整的GATT Profile（参考BlueZ的tools/btgatt-server.c）
- Central需处理扫描响应、连接状态机、数据读写异步回调等
跨平台替代方案:
- Windows/macOS可使用官方SDK（Windows WinRT APIs或Apple CoreBluetooth）
- 跨平台库推荐：SimpleBLE（C++17）或QtBluetooth（QML集成）