CB4获取小米蓝牙温湿度计2的数据

nabice

2代传数据方式和1代稍有变化。
首先安装bluez、bluetooth等软件包，为了省事儿，可以直接装上编译bluez需要的所有包：sudo apt-get build-dep bluez
然后根据CB4用户文档，确保蓝牙正常打开。
编译执行就ok了。

1. #include <stdlib.h>
   
2. 
   
3. #include <bluetooth/bluetooth.h>
   
4. #include <bluetooth/hci.h>
   
5. #include <bluetooth/hci_lib.h>
   
6. 
   
7. int main(int argc, char *argv[]) {
   
8.     int err, dd, i, result;
   
9.     bdaddr_t bdaddr;
   
10.     uint16_t interval, latency, max_ce_length, max_interval, min_ce_length;
    
11.     uint16_t min_interval, supervision_timeout, window, handle;
    
12.     uint8_t initiator_filter, own_bdaddr_type, peer_bdaddr_type;
    
13.     char buf[16];
    
14.     struct hci_filter flt;
    
15.     peer_bdaddr_type = LE_PUBLIC_ADDRESS;
    
16.     initiator_filter = 0; /* Use peer address */
    
17.     dd = hci_open_dev(0);
    
18.     if (dd < 0) {
    
19.         perror("Could not open device");
    
20.         exit(1);
    
21.     }
    
22. 
    
23.     memset(&bdaddr, 0, sizeof(bdaddr_t));
    
24.     if (argv[1])
    
25.         str2ba(argv[1], &bdaddr);
    
26.     interval = htobs(0x0004);
    
27.     window = htobs(0x0004);
    
28.     own_bdaddr_type = 0x00;
    
29.     min_interval = htobs(0x000F);
    
30.     max_interval = htobs(0x000F);
    
31.     latency = htobs(0x0000);
    
32.     supervision_timeout = htobs(0x0C80);
    
33.     min_ce_length = htobs(0x0001);
    
34.     max_ce_length = htobs(0x0001);
    
35. 
    
36.     err = hci_le_create_conn(dd, interval, window, initiator_filter,
    
37.             peer_bdaddr_type, bdaddr, own_bdaddr_type, min_interval,
    
38.             max_interval, latency, supervision_timeout,
    
39.             min_ce_length, max_ce_length, &handle, 25000);
    
40.     if (err < 0) {
    
41.         perror("Could not create connection");
    
42.         exit(1);
    
43.     }
    
44. 
    
45.     hci_filter_clear(&flt);
    
46.     hci_filter_set_ptype(HCI_ACLDATA_PKT, &flt);
    
47. 
    
48.     if (setsockopt(dd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
    
49.         perror("Failed to set HCI filter");
    
50.         close(dd);
    
51.         return -1;
    
52.     }
    
53. 
    
54.     for(i = 0; i<10; i++) {
    
55.         memset(&buf, 0, sizeof(buf));
    
56.         result = read(dd, &buf, sizeof(buf));
    
57.         if(result == 16 && buf[10] == 0x36) {
    
58.             printf("%d;%d\n", buf[12] | buf[13] << 8, buf[14]);
    
59.             break;
    
60.         }
    
61.     }
    
62.    
    
63.     err = hci_disconnect(dd, handle, HCI_OE_USER_ENDED_CONNECTION, 10000);
    
64.     if (err < 0) {
    
65.         perror("Could not disconnect");
    
66.         exit(1);
    
67.     }
    
68. 
    
69.     hci_close_dev(dd);
    
70. }

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