蓝牙虚拟串口 C++例程

以下是一个简单的蓝牙虚拟串口的C语言例程：

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/rfcomm.h>

#define DEV_NAME "MyBluetoothDevice"
#define DEV_CHANNEL 1
#define BAUD_RATE B9600

int open_serial_port(const char* port)
{
    int fd = open(port, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        perror("open");
        return -1;
    }

    fcntl(fd, F_SETFL, 0);

    struct termios options;
    tcgetattr(fd, &options);

    cfsetispeed(&options, BAUD_RATE);
    cfsetospeed(&options, BAUD_RATE);

    options.c_cflag |= (CLOCAL | CREAD);
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;

    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
    options.c_iflag &= ~(IXON | IXOFF | IXANY);
    options.c_oflag &= ~OPOST;

    tcsetattr(fd, TCSANOW, &options);

    return fd;
}

int main()
{
    // 创建蓝牙socket
    int bluetooth_socket = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
    if (bluetooth_socket == -1) {
        perror("socket");
        return -1;
    }

    // 设置本地蓝牙地址
    struct sockaddr_rc local_address = { 0 };
    local_address.rc_family = AF_BLUETOOTH;
    local_address.rc_bdaddr = *BDADDR_ANY;
    local_address.rc_channel = DEV_CHANNEL;

    if (bind(bluetooth_socket, (struct sockaddr*)&local_address, sizeof(local_address)) == -1) {
        perror("bind");
        close(bluetooth_socket);
        return -1;
    }

    // 监听连接请求
    if (listen(bluetooth_socket, 1) == -1) {
        perror("listen");
        close(bluetooth_socket);
        return -1;
    }

    printf("Waiting for incoming Bluetooth connection...\n");

    // 等待客户端连接
    struct sockaddr_rc remote_address = { 0 };
    socklen_t len = sizeof(remote_address);
    int client_socket = accept(bluetooth_socket, (struct sockaddr*)&remote_address, &len);
    if (client_socket == -1) {
        perror("accept");
        close(bluetooth_socket);
        return -1;
    }

    // 打开串口设备
    int serial_port = open_serial_port("/dev/ttyS0");
    if (serial_port == -1) {
        close(client_socket);
        close(bluetooth_socket);
        return -1;
    }

    printf("Bluetooth connection established.\n");

    char buffer[256];

    // 在两个设备之间进行数据传输
    while (1) {
        int count = read(client_socket, buffer, sizeof(buffer));
        if (count > 0) {
            write(serial_port, buffer, count);
        }

        count = read(serial_port, buffer, sizeof(buffer));
        if (count > 0) {
            write(client_socket, buffer, count);
        }

        usleep(1000);
    }

    close(client_socket);
    close(serial_port);
    close(bluetooth_socket);

    return 0;
}

这个例程使用了Linux的串口设备和蓝牙socket进行通信，通过等待客户端连接来建立蓝牙虚拟串口。在两个设备之间进行数据传输时，它只是简单地将收到的数据写入到另一个设备中。请注意，这个例程并没有考虑错误处理和异常情况。