CB4获取小米蓝牙温湿度计2的数据
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。#include <stdlib.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
int main(int argc, char *argv[]) {
int err, dd, i, result;
bdaddr_t bdaddr;
uint16_t interval, latency, max_ce_length, max_interval, min_ce_length;
uint16_t min_interval, supervision_timeout, window, handle;
uint8_t initiator_filter, own_bdaddr_type, peer_bdaddr_type;
char buf;
struct hci_filter flt;
peer_bdaddr_type = LE_PUBLIC_ADDRESS;
initiator_filter = 0; /* Use peer address */
dd = hci_open_dev(0);
if (dd < 0) {
perror("Could not open device");
exit(1);
}
memset(&bdaddr, 0, sizeof(bdaddr_t));
if (argv)
str2ba(argv, &bdaddr);
interval = htobs(0x0004);
window = htobs(0x0004);
own_bdaddr_type = 0x00;
min_interval = htobs(0x000F);
max_interval = htobs(0x000F);
latency = htobs(0x0000);
supervision_timeout = htobs(0x0C80);
min_ce_length = htobs(0x0001);
max_ce_length = htobs(0x0001);
err = hci_le_create_conn(dd, interval, window, initiator_filter,
peer_bdaddr_type, bdaddr, own_bdaddr_type, min_interval,
max_interval, latency, supervision_timeout,
min_ce_length, max_ce_length, &handle, 25000);
if (err < 0) {
perror("Could not create connection");
exit(1);
}
hci_filter_clear(&flt);
hci_filter_set_ptype(HCI_ACLDATA_PKT, &flt);
if (setsockopt(dd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
perror("Failed to set HCI filter");
close(dd);
return -1;
}
for(i = 0; i<10; i++) {
memset(&buf, 0, sizeof(buf));
result = read(dd, &buf, sizeof(buf));
if(result == 16 && buf == 0x36) {
printf("%d;%d\n", buf | buf << 8, buf);
break;
}
}
err = hci_disconnect(dd, handle, HCI_OE_USER_ENDED_CONNECTION, 10000);
if (err < 0) {
perror("Could not disconnect");
exit(1);
}
hci_close_dev(dd);
}
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