用C写蓝牙通讯程序：扫描、读取、发送_ble蓝牙扫描c语言-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_45605787/article/details/120949550

本文介绍了在Ubuntu系统中，利用bluez蓝牙库通过C语言进行蓝牙设备扫描和读写操作的方法。首先展示了扫描并打印附近蓝牙从机设备的名称和地址的代码，然后给出了连接特定蓝牙设备并进行读写操作的示例。这些示例对于理解Linux环境下的蓝牙通信原理非常有帮助。

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在Linux下，通过bluez 蓝牙库可以用C语言轻松实现蓝牙通信。在ubuntu下可以用 apt-get install libbluetooth-dev 安装该库。下面是几个简单示例。

一个简单的扫描程序，得到周边的蓝牙从机设备名和地址：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>

int main(int argc, char **argv)
{
    inquiry_info *ii = NULL;
    int max_rsp, num_rsp;
    int dev_id, sock, len, flags;
    int i;
    char addr[19] = { 0 };
    char name[248] = { 0 };

    dev_id = hci_get_route(NULL);
    sock = hci_open_dev( dev_id );
    if (dev_id < 0 || sock < 0) {
        perror("opening socket");
        exit(1);
    }

    len = 8;
    max_rsp = 255;
    flags = IREQ_CACHE_FLUSH;
    ii = (inquiry_info*)malloc(max_rsp * sizeof(inquiry_info));
    
    num_rsp = hci_inquiry(dev_id, len, max_rsp, NULL, &ii, flags);
    if( num_rsp < 0 ) perror("hci_inquiry");

    for (i = 0; i < num_rsp; i++) {
        ba2str(&(ii+i)->bdaddr, addr);
        memset(name, 0, sizeof(name));
        if (hci_read_remote_name(sock, &(ii+i)->bdaddr, sizeof(name), 
            name, 0) < 0)
        strcpy(name, "[unknown]");
        printf("%s %s\n", addr, name);
    }

    free( ii );
    close( sock );
    return 0;
}

读和写示例：

#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/rfcomm.h>

int main(int argc, char **argv)
{
    struct sockaddr_rc addr = { 0 };
    int s, status, len=0;
    char dest[18] = "00:12:01:31:01:13";
    char buf[256];
    // allocate a socket
    s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);

    // set the connection parameters (who to connect to)
    addr.rc_family = AF_BLUETOOTH;
    addr.rc_channel = (uint8_t) 1;
    str2ba( dest, &addr.rc_bdaddr );

    // connect to server
    status = connect(s, (struct sockaddr *)&addr, sizeof(addr));

    
    if(status){
        printf(" failed to connect the device!\n");
        return -1;
    }

    
    do{
        len = read(s, buf, sizeof buf);
    
     if( len>0 ) {
         buf[len]=0;
         printf("%s\n",buf);
         write(s, buf, strlen(buf));
     }
    }while(len>0);

    close(s);
    return 0;
}