Linux 上 C blueZ 中的蓝牙配对

蓝牙配对是在Linux上使用blueZ库进行蓝牙设备连接的一种常见方式。blueZ是一个开源的蓝牙协议栈，它提供了一组API来实现蓝牙设备的管理和通信。本文将介绍在Linux系统上使用C语言和blueZ库进行蓝牙配对的方法，并提供一个简单的案例代码来演示整个过程。

c
int adapter_id = hci_get_route(NULL);
int socket = hci_open_dev(adapter_id);

c
inquiry_info *devices;
int num_devices = hci_inquiry(adapter_id, 8, num_rsp, NULL, &devices, IREQ_CACHE_FLUSH);

c
bdaddr_t device_addr;
str2ba(device_mac_address, &device_addr);
struct hci_conn_info_req conn_info_req;
bacpy(&conn_info_req.bdaddr, &device_addr);
ioctl(socket, HCIGETCONNINFO, (unsigned long)&conn_info_req);

c
struct hci_request request;
hci_request_init(&request);
request.ogf = OGF_HOST_CTL;
request.ocf = OCF_ENCRYPT;
request.cparam = &encrypt_request;
request.clen = 0;
request.rparam = &encrypt_response;
request.rlen = sizeof(encrypt_response);
hci_send_req(socket, &request, 0);

c
struct hci_filter original_filter;
socklen_t original_filter_len = sizeof(original_filter);
hci_filter_clear(&original_filter);
hci_filter_set_ptype(HCI_EVENT_PKT, &original_filter);
hci_filter_set_event(EVT_CMD_COMPLETE, &original_filter);
setsockopt(socket, SOL_HCI, HCI_FILTER, &original_filter, sizeof(original_filter));

c
struct hci_event_hdr *event_hdr;
unsigned char *event_buffer = malloc(HCI_MAX_EVENT_SIZE);
while (1) {
    int length = read(socket, event_buffer, HCI_MAX_EVENT_SIZE);
    event_hdr = (struct hci_event_hdr *)(event_buffer + 1);
    if (event_hdr->evt == EVT_CMD_COMPLETE) {
        struct hci_ev_cmd_complete *cmd_complete = (struct hci_ev_cmd_complete *)(event_buffer + HCI_EVENT_HDR_SIZE + 1);
        if (cmd_complete->opcode == htobs(cmd_opcode)) {
            // 配对请求的回应处理
            break;
        }
    }
}