Raspberry Pi で Bluetooth を使う (C++)

Raspberry Pi で C++ で Bluetooth を使うプログラムです。
次のページのサンプルの simplescan.c を改造しました。
bitsbyte/bluetooth-programming-in-c

simplescan.cpp

// -----------------------------------------------------------------------
/*
    simplescan.cpp

                    May/25/2018
*/
// -----------------------------------------------------------------------
#include    <iostream>
#include    <fstream>

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

using namespace std;
// -----------------------------------------------------------------------
int main (int argc, char *argv[])
{
    cerr << "*** 開始 ***\n";

    char addr[19] = { 0 };
    char name[248] = { 0 };

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

    int len  = 8;
    int max_rsp = 255;
    int flags = IREQ_CACHE_FLUSH;
    inquiry_info *ii =  new inquiry_info[max_rsp * sizeof(inquiry_info)];

    int num_rsp = hci_inquiry(dev_id, len, max_rsp, NULL, &ii, flags);
    if( num_rsp < 0 ) perror("hci_inquiry");

    for (int it = 0; it < num_rsp; it++)
        {
        ba2str(&(ii + it)->bdaddr, addr);
        memset(name, 0, sizeof(name));
        if (hci_read_remote_name
            (sock, &(ii + it)->bdaddr, sizeof(name),name, 0) < 0)
            {
            strcpy(name, "[unknown]");
            }

        cout << addr << "\t";
        cout << name << "\n";
        }

    delete[] ii;

    close( sock );

    cerr << "*** 終了 ***\n";

    return 0;
}

// -----------------------------------------------------------------------

Makefile

simplescan: simplescan.cpp
    clang++ -o simplescan simplescan.cpp -lbluetooth
clean:
    rm -f simplescan

実行結果

$ ./simplescan 
*** 開始 ***
8C:25:08:41:EC:32       mishima
*** 終了 ***

Bluetooth の機器が周辺にあるか確認する方法

$ hcitool scan
Scanning ...
        8C:25:08:41:EC:32       mishima