C语言 如何使用蓝牙(RFCOMM)和树莓派获得Rssi值?

Question

我正在尝试在 C Code 中使用带有树莓派的 RFCom 获取 RSSI 值。 下面是我的代码(server.c(，服务器正在等待客户端进行通信。 如何添加可以获取 rssi 值的代码？ 我在hcitool.c中找到了hci_read_rssi(https://github.com/pauloborges/bluez/blob/master/tools/hcitool.c( 但是，我不知道如何在我的代码中使用它。 我尝试了很多次，我厌倦了寻找这个......

#include <stdio.h>   
#include <stdlib.h>   
#include <string.h>   
#include <unistd.h>   
#include <signal.h>   
#include <pthread.h>   
#include <sys/socket.h>   
#include <bluetooth/bluetooth.h>   
#include <bluetooth/rfcomm.h>   
#include <fcntl.h>
#include <ctype.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <getopt.h>
//#include <glib.h>
int s,client ;   
void ctrl_c_handler(int signal);   
void close_sockets();   
void *readMsg();   
void *sendMsg();   
int main(int argc,char **argv){   
(void) signal(SIGINT,ctrl_c_handler);   
pthread_t readT, writeT;   
char *message1 = "Read threadn";   
char *message2 = "Write threadn";   
int iret1, iret2;   
struct sockaddr_rc loc_addr={ 0 },client_addr={ 0 };   
char buf[18] = { 0 };   
unsigned int opt = sizeof(client_addr) ;   
test:
//allocate socket   
s = socket(AF_BLUETOOTH,SOCK_STREAM,BTPROTO_RFCOMM) ;   
//  
//    
//    //bind socket to port 1 of the first available   
loc_addr.rc_family = AF_BLUETOOTH ;   
str2ba("B8:27:EB:29:42:F3",&loc_addr.rc_bdaddr) ;//hci0; server device address is given   
loc_addr.rc_channel = 1 ; //port (maximum should be 30 for RFCOMM)   
bind(s,(struct sockaddr *)&loc_addr,sizeof(loc_addr));   
printf("Binding successn");   
//put socket into listen mode   
listen(s,1) ;   
printf("socket in listen moden");   
//accept one connection   
client = accept(s,(struct sockaddr *)&client_addr,&opt);   
ba2str(&client_addr.rc_bdaddr,buf);   
fprintf(stdout,"Connection accepted from %sn",buf);   
// I think that 'hci_read_rssi' goes in here. Is this right?
/* Create independent threads each of which will execute function */   
iret1 = pthread_create(&readT,NULL,readMsg,(void*) message1);   
//iret2 = pthread_create(&writeT,NULL,sendMsg,(void*) message2);   
pthread_join(readT,NULL);   
//pthread_join(writeT,NULL);   
close_sockets();
goto test;
return 0 ;   
}   
//                    
void *sendMsg(){   
char msg[25] ;   
int status ;   
do{   
memset(msg,0,sizeof(msg));   
fgets(msg,24,stdin);   
if(strncmp("EXIT",msg,4)==0 || strncmp("exit",msg,4)==0)break;   
status = send(client,msg,strlen(msg),0);   
fprintf(stdout,"Status = %dn",status);   
}while(status > 0);   
}   
void *readMsg(){   
int bytes_read;   
char buf[1024] = { 0 };   
do{   
memset(buf,0,sizeof(buf));   
//read data from the client   
bytes_read = recv(client,buf,sizeof(buf),0) ;   
//fprintf(stdout,"Bytes read = %dn",bytes_read);   
if(bytes_read <= 0)break;   
fprintf(stdout,"Received Value = %s",buf);   
}while(1);   
}   
void close_sockets(){   
//close connection   
close(client);   
close(s) ;   
printf("sockets closedn");   
}   
void ctrl_c_handler(int signal) {   
printf("Catched signal: %d ... !!n", signal);   
close_sockets();   
exit(0);   
//(void) signal(SIGINT, SIG_DFL);   
}   

Answer 1

假设client是一个连接句柄，请尝试将其粘贴到您的评论"//我认为'hci_read_rssi'在这里。这是对的吗？

int dd = hci_open_dev(dev_id); // dev_id is up to you to get.
int8_t rssi = 0;
if (dd < 0) {
printf("HCI device open failed");
} else {
if (hci_read_rssi(dd, client, &rssi, 1000) < 0) {
printf("Read RSSI failed");
} else {
printf("RSSI return value: %dn", rssi);
}
}