1. What is BlueZ ¶
The overall goal of this project is to make an implementation of the Bluetooth™ wireless standards specifications for Linux. The code is licensed under the GNU General Public License (GPL) and is now included in the Linux 2.4 and Linux 2.6 kernel series.
from http://www.bluez.org/
from http://www.bluez.org/
1.1. BlueZ 설치 및 설정 ¶
http://www.bluez.org/download.html
에서 BlueZ 라이브러리를 받아서 컴파일해야함.
주의점) 커널 2.4의 경우 스택에 RFCOMM 관련 스택이 구현 안된 버전들이 존재하기 때문에 해당 사이트에서 버전에 맞는 패치를 한뒤 커널을 새로 올려야함.
에서 BlueZ 라이브러리를 받아서 컴파일해야함.
2.1. 주변 Bluetooth 노드 찾기 ¶
~cpp #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/hci.h> #include <bluetooth/hci_lib.h> int main(int argc, char **argv) { inquiry_info *ii = NULL; int max_rsp, num_rsp; int dev_id, sock, len, flags; int i; char addr[19] = { 0 }; char name[248] = { 0 }; dev_id = hci_get_route(NULL); sock = hci_open_dev( dev_id ); if (dev_id < 0 || sock < 0) { perror("opening socket"); exit(1); } len = 8; max_rsp = 255; flags = IREQ_CACHE_FLUSH; ii = (inquiry_info*)malloc(max_rsp * sizeof(inquiry_info)); num_rsp = hci_inquiry(dev_id, len, max_rsp, NULL, &ii, flags); if( num_rsp < 0 ) perror("hci_inquiry"); for (i = 0; i < num_rsp; i++) { ba2str(&(ii+i)->bdaddr, addr); memset(name, 0, sizeof(name)); if (hci_read_remote_name(sock, &(ii+i)->bdaddr, sizeof(name), name, 0) < 0) strcpy(name, "[unknown]"); printf("%s %s\n", addr, name); } free( ii ); close( sock ); return 0; }
2.2.1. rfcomm-server.c ¶
~cpp #include <stdio.h> #include <unistd.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/rfcomm.h> int main(int argc, char **argv) { struct sockaddr_rc loc_addr = { 0 }, rem_addr = { 0 }; char buf[1024] = { 0 }; int s, client, bytes_read; int opt = sizeof(rem_addr); // allocate socket s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); // bind socket to port 1 of the first available // local bluetooth adapter loc_addr.rc_family = AF_BLUETOOTH; loc_addr.rc_bdaddr = *BDADDR_ANY; loc_addr.rc_channel = (uint8_t) 1; bind(s, (struct sockaddr *)&loc_addr, sizeof(loc_addr)); // put socket into listening mode listen(s, 1); // accept one connection client = accept(s, (struct sockaddr *)&rem_addr, &opt); ba2str( &rem_addr.rc_bdaddr, buf ); fprintf(stderr, "accepted connection from %s\n", buf); memset(buf, 0, sizeof(buf)); // read data from the client bytes_read = read(client, buf, sizeof(buf)); if( bytes_read > 0 ) { printf("received [%s]\n", buf); } // close connection close(client); close(s); return 0; }
2.2.2. rfcomm-client.c ¶
~cpp #include <stdio.h> #include <unistd.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/rfcomm.h> int main(int argc, char **argv) { struct sockaddr_rc addr = { 0 }; int s, status; char dest[18] = "01:23:45:67:89:AB"; // allocate a socket s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM); // set the connection parameters (who to connect to) addr.rc_family = AF_BLUETOOTH; addr.rc_channel = (uint8_t) 1; str2ba( dest, &addr.rc_bdaddr ); // connect to server status = connect(s, (struct sockaddr *)&addr, sizeof(addr)); // send a message if( status == 0 ) { status = write(s, "hello!", 6); } if( status < 0 ) perror("uh oh"); close(s); return 0; }
2.3.1. l2cap-server.c ¶
~cpp #include <stdio.h> #include <string.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/l2cap.h> int main(int argc, char **argv) { struct sockaddr_l2 loc_addr = { 0 }, rem_addr = { 0 }; char buf[1024] = { 0 }; int s, client, bytes_read; int opt = sizeof(rem_addr); // allocate socket s = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); // bind socket to port 0x1001 of the first available // bluetooth adapter loc_addr.l2_family = AF_BLUETOOTH; loc_addr.l2_bdaddr = *BDADDR_ANY; loc_addr.l2_psm = htobs(0x1001); bind(s, (struct sockaddr *)&loc_addr, sizeof(loc_addr)); // put socket into listening mode listen(s, 1); // accept one connection client = accept(s, (struct sockaddr *)&rem_addr, &opt); ba2str( &rem_addr.l2_bdaddr, buf ); fprintf(stderr, "accepted connection from %s\n", buf); memset(buf, 0, sizeof(buf)); // read data from the client bytes_read = read(client, buf, sizeof(buf)); if( bytes_read > 0 ) { printf("received [%s]\n", buf); } // close connection close(client); close(s); }
~cpp #include <stdio.h> #include <string.h> #include <sys/socket.h> #include <bluetooth/bluetooth.h> #include <bluetooth/l2cap.h> int main(int argc, char **argv) { struct sockaddr_l2 addr = { 0 }; int s, status; char *message = "hello!"; char dest[18] = "01:23:45:67:89:AB"; if(argc < 2) { fprintf(stderr, "usage: %s <bt_addr>\n", argv[0]); exit(2); } strncpy(dest, argv[1], 18); // allocate a socket s = socket(AF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP); // set the connection parameters (who to connect to) addr.l2_family = AF_BLUETOOTH; addr.l2_psm = htobs(0x1001); str2ba( dest, &addr.l2_bdaddr ); // connect to server status = connect(s, (struct sockaddr *)&addr, sizeof(addr)); // send a message if( status == 0 ) { status = write(s, "hello!", 6); } if( status < 0 ) perror("uh oh"); close(s); }